widget-factory: Precompile the ui file

It doesn't make a huge amount of difference, unfortunately.

.gitlab-ci.yml

@@ -7,6 +7,7 @@ stages:
   - analysis
   - docs
   - flatpak
+  - publish
   - deploy
 
 .cache-paths: &cache-paths
@@ -24,7 +25,7 @@ variables:
   BACKEND_FLAGS: "-Dx11-backend=true -Dwayland-backend=true -Dbroadway-backend=true"
   FEATURE_FLAGS: "-Dvulkan=enabled -Dcloudproviders=enabled"
   MESON_TEST_TIMEOUT_MULTIPLIER: 3
-  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v32"
+  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v34"
   FLATPAK_IMAGE: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master"
 
 .only-default:
@@ -57,6 +58,7 @@ style-check-diff:
       - "${CI_PROJECT_DIR}/_build/report*.xml"
       - "${CI_PROJECT_DIR}/_build/report*.html"
       - "${CI_PROJECT_DIR}/_build/testsuite/reftests/output/*/*.png"
+      - "${CI_PROJECT_DIR}/_build/testsuite/tools/output/*/*"
       - "${CI_PROJECT_DIR}/_build/testsuite/gsk/compare/*/*/*.png"
       - "${CI_PROJECT_DIR}/_build/testsuite/css/output/*/*.syscap"
       - "${CI_PROJECT_DIR}/_build_hello/meson-logs"
@@ -172,6 +174,7 @@ macos:
     - meson -Dx11-backend=false
             -Dbroadway-backend=true
             -Dmacos-backend=true
+            -Dmedia-gstreamer=disabled
             -Dintrospection=disabled
             -Dcpp_std=c++11
             -Dpixman:tests=disabled
@@ -335,14 +338,11 @@ reference:
     paths:
       - _reference
 
-pages:
-  stage: deploy
+publish-docs:
+  stage: publish
   needs: ['reference']
   script:
-    - mv _reference/ public/
-    - cp .gitlab-ci/pages/* public/
-  artifacts:
-    paths:
-      - public
+    - "curl -X POST -F token=${PAGES_TRIGGER_TOKEN} -F ref=docs-gtk-org https://gitlab.gnome.org/api/v4/projects/665/trigger/pipeline"
   only:
-    - master
+    refs:
+      - master

.gitlab-ci/fedora.Dockerfile

@@ -48,9 +48,12 @@ RUN dnf -y install \
     libcloudproviders-devel \
     libepoxy-devel \
     libffi-devel \
+    libjpeg-turbo-devel \
     libmount-devel \
+    libpng-devel \
     librsvg2 \
     libselinux-devel \
+    libtiff-devel \
     libubsan \
     libXcomposite-devel \
     libXcursor-devel \

.gitlab-ci/test-docker.sh

@@ -15,7 +15,7 @@ meson \
         -Dx11-backend=true \
         -Dwayland-backend=true \
         -Dbroadway-backend=true \
-        -Dvulkan=yes \
+        -Dvulkan=enabled \
         -Dprofiler=true \
         --werror \
         ${EXTRA_MESON_FLAGS:-} \

.gitlab-ci/test-msvc.bat

@@ -6,7 +6,7 @@ call "C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Auxiliar
 
 :: FIXME: make warnings fatal
 pip3 install --upgrade --user meson==0.56.2  || goto :error
-meson _build || goto :error
+meson -Dmedia-gstreamer=disabled _build || goto :error
 ninja -C _build || goto :error
 
 goto :EOF

.gitlab-ci/test-msys2.sh

@@ -40,7 +40,7 @@ export CCACHE_DIR="${CCACHE_BASEDIR}/_ccache"
 # https://gitlab.gnome.org/GNOME/gtk/-/issues/2243
 # https://gitlab.gnome.org/GNOME/gtk/-/issues/3002
 
-if ! pkg-config --atleast-version=2.65.0 glib-2.0; then
+if ! pkg-config --atleast-version=2.66.0 glib-2.0; then
     git clone https://gitlab.gnome.org/GNOME/glib.git _glib
     meson setup _glib_build _glib
     meson compile -C _glib_build
@@ -48,7 +48,7 @@ if ! pkg-config --atleast-version=2.65.0 glib-2.0; then
 fi
 pkg-config --modversion glib-2.0
 
-if ! pkg-config --atleast-version=1.47.0 pango; then
+if ! pkg-config --atleast-version=1.49.1 pango; then
     git clone https://gitlab.gnome.org/GNOME/pango.git _pango
     meson setup _pango_build _pango
     meson compile -C _pango_build

NEWS

@@ -1,3 +1,191 @@
+Overview of Changes
+===================
+
+* gsk:
+ - Drop the GL renderer in favor of NGL
+
+* css:
+ - Add support for line-height
+ - Add support for text-transform
+
+* GtkTextView:
+ - Add support for line height
+ - Add support for text transforms
+
+* Build:
+ - Require Pango 1.49
+
+
+Overview of Changes in 4.4.0
+============================
+
+* Input:
+ - Match IBus for display of Compose sequences
+ - Match IBus for handling of mismatches
+ - Handle Escape in Compose sequences
+ - Allow multiple dead keys
+ - Support 32bit keysyms
+
+* GtkCheckButton:
+ - Activate when moving focus
+
+* GtkLabel:
+ - Propertly ignore double underscores for mnemonics
+
+* GtkPopoverMenu:
+ - Fix focus cycling
+
+* GtkTextView:
+ - Improve word selection
+ - Fix block cursors on empty lines
+
+* GdkToplevel:
+ - Support the gnome-shell titlebar gesture protocol
+
+* GdkDropTarget:
+ - Allow creating drop targets in ui files
+
+* gsk:
+ - Handle partial color fonts correctly
+ - Use harfbuzz for color font information
+ - Avoid pango for glyph cache rendering
+ - Shrink shadow extents
+
+* Settings:
+ - Change the default for gtk-split-cursor to FALSE
+
+* Demos:
+ - Small improvements to widget-factory
+ - gtk-demo: Improve the hypertext demo
+ - gtk-dem: Improve the clipboard demo
+
+* X11:
+ - Set WM_CLASS on toplevels
+
+* Wayland:
+ - Support wl_seat v7
+
+* Windows:
+ - Drop the local DND protocol
+ - Avoid WGL if shaders don't work
+ - Use WinPointer API
+
+* Translation updates:
+ Belarusian
+ Friulian
+ Hebrew
+ Khmer
+ Persian
+ Polish
+
+
+Overview of Changes in 4.3.2
+============================
+
+* GtkToggleButton:
+ - Fix the actionable implementation
+
+* GtkCheckButton:
+ - Fix the actionable implementation
+ - Cancel activation on when the pointer leaves
+
+* GtkMenuButton:
+ - Make activatable again
+ - Add a way to have an icon + arrow
+
+* GtkColorButton:
+ - Make activatable again
+
+* GtkFontButton:
+ - Make activatable again
+
+* GtkAppChooserButton:
+ - Make activatable again
+
+* GtkColumnView:
+ - Fix double activation
+
+* GtkLabel:
+ - Fix mnemonics without markup
+
+* GtkTreeView:
+ - Clip header buttons
+
+* GtkTextView:
+ - Add api to get the RTL and LTR contexts
+ - Fix some errors in text history grouping
+
+* GtkText:
+ - Don't show placeholder text on top of entry text
+ - Add api to compute the cursor extents
+ - Fix y coordinates for text selection
+
+* GtkFileChooser:
+ - Don't show Trash in the side bar
+
+* GtkPopoverMenu:
+ - Add scrollbars to long menus
+
+* GtkActionMuxer:
+ - Fix propagation of accel changes
+
+* Introspection:
+ - Annotate all filename arguments
+ - Rename GtkMediaStream apis to avoid name collisions
+ - Rename GtkDropTarget properties to avoid name collisions
+ - Make GtkPasswordEntryBuffer introspectable
+
+* Printing:
+ - Remove the Google Cloud Print backend
+
+* Theme:
+ - Sync included icons with the Adwaita icon theme
+
+* GSK:
+ - Avoid overflowing the vertex counter
+ - Handle negative scales correctly in the ngl renderer
+
+* GDK:
+ - Cleanup and simplify OpenGL setup code
+ - Add a GdkDisplay::init_gl vfunc and gdk_display_prepare_gl() api
+ - Require EGL 1.4
+ - Fix EGL + NVidia
+
+* Build:
+ - Enable gstreamer by default
+ - Disable Vulkan by default
+ - Remove the sassc option
+ - Remove options and checks for X11 extensions
+
+* X11:
+ - Stop using XComposite
+ - Remove the Visual cache
+
+* Wayland:
+ - Fix some DND corner cases
+ - Work with version 2 of pointer-gestures-v1
+ - Look for cursor themes in $HOME/.icons
+
+* Windows:
+ - Fix SIGILL on x64 due to popcnt
+ - Fix popup placement
+ - Fix drag icon placement
+ - Clean up HiDPI and WGL support
+ - Default to WGL
+
+* MacOs:
+ - Fix input method support
+ - Register known clipboard types for drop targets
+ - Add initial DND support
+
+* Translation updates:
+ Brazilian Portuguese
+ Portuguese
+ Romanian
+ Turkish
+ Ukrainian
+
+
 Overview of Changes in 4.3.1
 ============================
 

README.md

@@ -10,10 +10,12 @@ GTK is a multi-platform toolkit for creating graphical user interfaces.
 Offering a complete set of widgets, GTK is suitable for projects ranging
 from small one-off projects to complete application suites.
 
-GTK is free software and part of the GNU Project. However, the
-licensing terms for GTK, the GNU LGPL, allow it to be used by all
-developers, including those developing proprietary software, without any
-license fees or royalties.
+GTK is a free and open-source software project. The licensing terms
+for GTK, the GNU LGPL, allow it to be used by all developers, including those
+developing proprietary software, without any license fees or royalties.
+
+GTK is hosted by the GNOME project (thanks!) and used by a wide variety
+of applications and projects.
 
 The official download location
 
@@ -151,6 +153,9 @@ Contributing to GTK
 Please, follow the [contribution guide](./CONTRIBUTING.md) to know how to
 start contributing to GTK.
 
+If you want to support GTK financially, please consider donating to
+the GNOME project, which runs the infrastructure hosting GTK.
+
 Release notes
 -------------
 

config.h.meson

@@ -1,289 +0,0 @@
-/* always defined to indicate that i18n is enabled */
-#define ENABLE_NLS 1
-
-/* Use structured logging */
-#define G_LOG_STRUCTURED 1
-
-/* The prefix for our gettext translation domains. */
-#mesondefine GETTEXT_PACKAGE
-
-/* Disable deprecation warnings from glib */
-#mesondefine GLIB_DISABLE_DEPRECATION_WARNINGS
-
-/* Define the location where the catalogs will be installed */
-#mesondefine GTK_LOCALEDIR
-
-/* Define to 1 if you have the `bind_textdomain_codeset' function. */
-#mesondefine HAVE_BIND_TEXTDOMAIN_CODESET
-
-/* Have the cloudproviders library */
-#mesondefine HAVE_CLOUDPROVIDERS
-
-/* define if we have colord */
-#mesondefine HAVE_COLORD
-
-/* Define to 1 if you have the <crt_externs.h> header file. */
-#mesondefine HAVE_CRT_EXTERNS_H
-
-/* Define to 1 if you have the `dcgettext' function. */
-#mesondefine HAVE_DCGETTEXT
-
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#mesondefine HAVE_DLFCN_H
-
-/* Have the ffmpeg library */
-#mesondefine HAVE_FFMPEG
-
-/* Define to 1 if you have the <ftw.h> header file. */
-#mesondefine HAVE_FTW_H
-
-/* Define to 1 if you have the `getpagesize' function. */
-#mesondefine HAVE_GETPAGESIZE
-
-/* Define to 1 if you have the `getresuid' function. */
-#mesondefine HAVE_GETRESUID
-
-/* Define if gio-unix is available */
-#mesondefine HAVE_GIO_UNIX
-
-/* Define if GStreamer support is available */
-#mesondefine HAVE_GSTREAMER
-
-/* Define to 1 if you have the <inttypes.h> header file. */
-#mesondefine HAVE_INTTYPES_H
-
-/* Define to 1 if the system has the type `IPrintDialogCallback'. */
-#mesondefine HAVE_IPRINTDIALOGCALLBACK
-
-/* Define to 1 if you have the <locale.h> header file. */
-#mesondefine HAVE_LOCALE_H
-
-/* Define to 1 if you have the `lstat' function. */
-#mesondefine HAVE_LSTAT
-
-/* Define to 1 if you have the `mallinfo' function. */
-#mesondefine HAVE_MALLINFO
-
-/* Define to 1 if you have the <memory.h> header file. */
-#mesondefine HAVE_MEMORY_H
-
-/* Define to 1 if you have the `mkstemp' function. */
-#mesondefine HAVE_MKSTEMP
-
-/* Define to 1 if you have the `mlock` function. */
-#mesondefine HAVE_MLOCK
-
-/* Define to 1 if you have a working `mmap' system call. */
-#mesondefine HAVE_MMAP
-
-/* Define to 1 if you have a working `madvise' system call. */
-#mesondefine HAVE_MADVISE
-
-/* Define to 1 if you have the `posix_fallocate' function. */
-#mesondefine HAVE_POSIX_FALLOCATE
-
-/* Have the Xrandr extension library */
-#mesondefine HAVE_RANDR
-
-/* Have the Xrandr 1.5 extension library */
-#mesondefine HAVE_RANDR15
-
-/* Define to 1 if you have the `sincos' function. */
-#mesondefine HAVE_SINCOS
-
-/* Define to 1 if you have the <stdint.h> header file. */
-#mesondefine HAVE_STDINT_H
-
-/* Define to 1 if you have the <stdlib.h> header file. */
-#mesondefine HAVE_STDLIB_H
-
-/* Define to 1 if you have the <strings.h> header file. */
-#mesondefine HAVE_STRINGS_H
-
-/* Define to 1 if you have the <string.h> header file. */
-#mesondefine HAVE_STRING_H
-
-/* Define to 1 if you have the <sys/mman.h> header file. */
-#mesondefine HAVE_SYS_MMAN_H
-
-/* Define to 1 if you have the <sys/param.h> header file. */
-#mesondefine HAVE_SYS_PARAM_H
-
-/* Have the sysprof-capture library */
-#mesondefine HAVE_SYSPROF
-
-/* Define to 1 if you have the <sys/stat.h> header file. */
-#mesondefine HAVE_SYS_STAT_H
-
-/* Define to 1 if you have the <sys/time.h> header file. */
-#mesondefine HAVE_SYS_TIME_H
-
-/* Define to 1 if you have the <sys/types.h> header file. */
-#mesondefine HAVE_SYS_TYPES_H
-
-/* Define to 1 if you have the <unistd.h> header file. */
-#mesondefine HAVE_UNISTD_H
-
-/* Have the XCOMPOSITE X extension */
-#mesondefine HAVE_XCOMPOSITE
-
-/* Have the Xcursor library */
-#mesondefine HAVE_XCURSOR
-
-/* Have the XDAMAGE X extension */
-#mesondefine HAVE_XDAMAGE
-
-/* Have the XFIXES X extension */
-#mesondefine HAVE_XFIXES
-
-/* Define to 1 if XFree Xinerama is available */
-#mesondefine HAVE_XFREE_XINERAMA
-
-/* Have XGenericEvent */
-#mesondefine HAVE_XGENERICEVENTS
-
-/* Define to use XKB extension */
-#mesondefine HAVE_XKB
-
-/* Have the SYNC extension library */
-#mesondefine HAVE_XSYNC
-
-/* Define to 1 if you have the `_lock_file' function */
-#mesondefine HAVE__LOCK_FILE
-
-/* Define to 1 if you have the `flockfile' function */
-#mesondefine HAVE_FLOCKFILE
-
-/* Define if _NL_MEASUREMENT_MEASUREMENT is available */
-#mesondefine HAVE__NL_MEASUREMENT_MEASUREMENT
-
-/* Define if _NL_PAPER_HEIGHT is available */
-#mesondefine HAVE__NL_PAPER_HEIGHT
-
-/* Define if _NL_PAPER_WIDTH is available */
-#mesondefine HAVE__NL_PAPER_WIDTH
-
-/* Define if _NL_TIME_FIRST_WEEKDAY is available */
-#mesondefine HAVE__NL_TIME_FIRST_WEEKDAY
-
-/* Define to the sub-directory where libtool stores uninstalled libraries. */
-#mesondefine LT_OBJDIR
-
-/* Define to 1 if your C compiler doesn't accept -c and -o together. */
-#mesondefine NO_MINUS_C_MINUS_O
-
-/* Define to the address where bug reports for this package should be sent. */
-#mesondefine PACKAGE_BUGREPORT
-
-/* Define to the full name of this package. */
-#mesondefine PACKAGE_NAME
-
-/* Define to the full name and version of this package. */
-#mesondefine PACKAGE_STRING
-
-/* Define to the one symbol short name of this package. */
-#mesondefine PACKAGE_TARNAME
-
-/* Define to the home page for this package. */
-#mesondefine PACKAGE_URL
-
-/* Define to the version of this package. */
-#mesondefine PACKAGE_VERSION
-
-/* Use NSBundle functions to determine load paths for libraries, translations,
-   etc. */
-#mesondefine QUARTZ_RELOCATION
-
-/* Define to 1 if you have the ANSI C header files. */
-#mesondefine STDC_HEADERS
-
-/* Enable extensions on AIX 3, Interix.  */
-#ifndef _ALL_SOURCE
-# undef _ALL_SOURCE
-#endif
-/* Enable GNU extensions on systems that have them.  */
-#ifndef _GNU_SOURCE
-# undef _GNU_SOURCE
-#endif
-/* Enable threading extensions on Solaris.  */
-#ifndef _POSIX_PTHREAD_SEMANTICS
-# undef _POSIX_PTHREAD_SEMANTICS
-#endif
-/* Enable extensions on HP NonStop.  */
-#ifndef _TANDEM_SOURCE
-# undef _TANDEM_SOURCE
-#endif
-/* Enable general extensions on Solaris.  */
-#ifndef __EXTENSIONS__
-# undef __EXTENSIONS__
-#endif
-
-
-/* Define to 1 if XInput 2.2 is available */
-#mesondefine XINPUT_2_2
-
-/* Define to 1 if the X Window System is missing or not being used. */
-#mesondefine X_DISPLAY_MISSING
-
-/* Enable large inode numbers on Mac OS X 10.5.  */
-#ifndef _DARWIN_USE_64_BIT_INODE
-# define _DARWIN_USE_64_BIT_INODE 1
-#endif
-
-/* Number of bits in a file offset, on hosts where this is settable. */
-#mesondefine _FILE_OFFSET_BITS
-
-/* defines how to decorate public symbols while building */
-#mesondefine _GDK_EXTERN
-
-/* Define for large files, on AIX-style hosts. */
-#mesondefine _LARGE_FILES
-
-/* Define to 1 if on MINIX. */
-#mesondefine _MINIX
-
-/* Define to 2 if the system does not provide POSIX.1 features except with
-   this defined. */
-#mesondefine _POSIX_1_SOURCE
-
-/* Define to 1 if you need to in order for `stat' and other things to work. */
-#mesondefine _POSIX_SOURCE
-
-/* Define to `int' if <sys/types.h> doesn't define. */
-#mesondefine gid_t
-
-/* Define to `int' if <sys/types.h> doesn't define. */
-#mesondefine uid_t
-
-/* Define to 1 if linux/memfd.h exists */
-#mesondefine HAVE_LINUX_MEMFD_H
-
-#mesondefine HAVE_LINUX_INPUT_H
-
-#mesondefine HAVE_DEV_EVDEV_INPUT_H
-
-#mesondefine GTK_SYSCONFDIR
-
-#mesondefine GTK_LOCALEDIR
-
-#mesondefine GTK_DATADIR
-
-#mesondefine GTK_LIBDIR
-
-#mesondefine GTK_PRINT_BACKENDS
-
-#mesondefine HAVE_CAIRO_SCRIPT_INTERPRETER
-
-#mesondefine HAVE_HARFBUZZ
-
-#mesondefine HAVE_PANGOFT
-
-#mesondefine ISO_CODES_PREFIX
-
-/* Define if tracker3 is available */
-#mesondefine HAVE_TRACKER3
-
-#mesondefine HAVE_F16C
-
-/* Does the OS support GDesktopAppInfo? */
-#mesondefine HAVE_DESKTOPAPPINFO

demos/gtk-demo/demo.gresource.xml

@@ -321,6 +321,7 @@
     <file>paintable_emblem.c</file>
     <file>paintable_mediastream.c</file>
     <file>paintable_svg.c</file>
+    <file>paintable_symbolic.c</file>
     <file>panes.c</file>
     <file>password_entry.c</file>
     <file>peg_solitaire.c</file>

demos/gtk-demo/demoimage.c

@@ -100,7 +100,11 @@ prepare_drag (GtkDragSource *source,
   DemoImage *demo = DEMO_IMAGE (widget);
   GdkPaintable *paintable = get_image_paintable (GTK_IMAGE (demo->image));
 
-  return gdk_content_provider_new_typed (GDK_TYPE_PAINTABLE, paintable);
+  /* Textures can be serialized, paintables can't, so special case the textures */
+  if (GDK_IS_TEXTURE (paintable))
+    return gdk_content_provider_new_typed (GDK_TYPE_TEXTURE, paintable);
+  else
+    return gdk_content_provider_new_typed (GDK_TYPE_PAINTABLE, paintable);
 }
 
 static gboolean
@@ -129,7 +133,11 @@ copy_image (GtkWidget *widget,
   GdkPaintable *paintable = get_image_paintable (GTK_IMAGE (demo->image));
   GValue value = G_VALUE_INIT;
 
-  g_value_init (&value, GDK_TYPE_PAINTABLE);
+  /* Textures can be serialized, paintables can't, so special case the textures */
+  if (GDK_IS_TEXTURE (paintable))
+    g_value_init (&value, GDK_TYPE_TEXTURE);
+  else
+    g_value_init (&value, GDK_TYPE_PAINTABLE);
   g_value_set_object (&value, paintable);
   gdk_clipboard_set_value (clipboard, &value);
   g_value_unset (&value);
@@ -138,24 +146,46 @@ copy_image (GtkWidget *widget,
     g_object_unref (paintable);
 }
 
+static void
+paste_image_cb (GObject      *source,
+                GAsyncResult *result,
+                gpointer      data)
+{
+  GdkClipboard *clipboard = GDK_CLIPBOARD (source);
+  DemoImage *demo = DEMO_IMAGE (data);
+  const GValue *value;
+
+  value = gdk_clipboard_read_value_finish (clipboard, result, NULL);
+  if (value == NULL)
+    {
+      gtk_widget_error_bell (GTK_WIDGET (demo));
+      g_object_unref (demo);
+      return;
+    }
+
+  gtk_image_set_from_paintable (GTK_IMAGE (demo->image), g_value_get_object (value));
+  g_object_unref (demo);
+}
+
 static void
 paste_image (GtkWidget *widget,
              const char *action_name,
              GVariant *parameter)
 {
   GdkClipboard *clipboard = gtk_widget_get_clipboard (widget);
-  DemoImage *demo = DEMO_IMAGE (widget);
-  GdkContentProvider *content = gdk_clipboard_get_content (clipboard);
-  GValue value = G_VALUE_INIT;
-  GdkPaintable *paintable;
+  GType type;
 
-  g_value_init (&value, GDK_TYPE_PAINTABLE);
-  if (!gdk_content_provider_get_value (content, &value, NULL))
-    return;
+  if (gdk_content_formats_contain_gtype (gdk_clipboard_get_formats (clipboard), GDK_TYPE_TEXTURE))
+    type = GDK_TYPE_TEXTURE;
+  else
+    type = GDK_TYPE_PAINTABLE;
 
-  paintable = GDK_PAINTABLE (g_value_get_object (&value));
-  gtk_image_set_from_paintable (GTK_IMAGE (demo->image), paintable);
-  g_value_unset (&value);
+  gdk_clipboard_read_value_async (clipboard, 
+                                  type,
+                                  G_PRIORITY_DEFAULT,
+                                  NULL,
+                                  paste_image_cb,
+                                  g_object_ref (widget));
 }
 
 static void

demos/gtk-demo/fontify.c

@@ -131,6 +131,19 @@ insert_tags_for_attributes (GtkTextBuffer     *buffer,
       gtk_text_buffer_apply_tag (buffer, tag, start, end); \
     }
 
+#define VOID_ATTR(attr_name) \
+    { \
+      tag = gtk_text_tag_table_lookup (table, #attr_name); \
+      if (!tag) \
+        { \
+          tag = gtk_text_tag_new (#attr_name); \
+          g_object_set (tag, #attr_name, TRUE, NULL); \
+          gtk_text_tag_table_add (table, tag); \
+          g_object_unref (tag); \
+        } \
+      gtk_text_buffer_apply_tag (buffer, tag, start, end); \
+    }
+
   fg_alpha = bg_alpha = 1.;
 
   attrs = pango_attr_iterator_get_attrs (iter);
@@ -255,6 +268,29 @@ insert_tags_for_attributes (GtkTextBuffer     *buffer,
           INT_ATTR (insert_hyphens);
           break;
 
+        case PANGO_ATTR_LINE_HEIGHT:
+          FLOAT_ATTR (line_height);
+          break;
+
+        case PANGO_ATTR_ABSOLUTE_LINE_HEIGHT:
+          break;
+
+        case PANGO_ATTR_WORD:
+          VOID_ATTR (word);
+          break;
+
+        case PANGO_ATTR_SENTENCE:
+          VOID_ATTR (sentence);
+          break;
+
+        case PANGO_ATTR_BASELINE_SHIFT:
+          INT_ATTR (baseline_shift);
+          break;
+
+        case PANGO_ATTR_FONT_SCALE:
+          INT_ATTR (font_scale);
+          break;
+
         case PANGO_ATTR_SHAPE:
         case PANGO_ATTR_ABSOLUTE_SIZE:
         case PANGO_ATTR_GRAVITY:
@@ -263,6 +299,10 @@ insert_tags_for_attributes (GtkTextBuffer     *buffer,
         case PANGO_ATTR_BACKGROUND_ALPHA:
           break;
 
+        case PANGO_ATTR_TEXT_TRANSFORM:
+          INT_ATTR (text_transform);
+          break;
+
         case PANGO_ATTR_INVALID:
         default:
           g_assert_not_reached ();

demos/gtk-demo/fontrendering.c

@@ -1,6 +1,11 @@
 /* Pango/Font Rendering
  *
- * Demonstrates various aspects of font rendering.
+ * Demonstrates various aspects of font rendering,
+ * such as hinting, antialiasing and grid alignment.
+ *
+ * The demo lets you explore font rendering options
+ * interactively to get a feeling for they affect the
+ * shape and positioning of the glyphs.
  */
 
 #include <gtk/gtk.h>
@@ -10,16 +15,21 @@ static GtkWidget *font_button = NULL;
 static GtkWidget *entry = NULL;
 static GtkWidget *image = NULL;
 static GtkWidget *hinting = NULL;
+static GtkWidget *anti_alias = NULL;
 static GtkWidget *hint_metrics = NULL;
 static GtkWidget *up_button = NULL;
 static GtkWidget *down_button = NULL;
 static GtkWidget *text_radio = NULL;
 static GtkWidget *show_grid = NULL;
 static GtkWidget *show_extents = NULL;
+static GtkWidget *show_pixels = NULL;
+static GtkWidget *show_outlines = NULL;
 
 static PangoContext *context;
 
-static int scale = 9;
+static int scale = 7;
+static double pixel_alpha = 1.0;
+static double outline_alpha = 0.0;
 
 static void
 update_image (void)
@@ -27,7 +37,7 @@ update_image (void)
   const char *text;
   PangoFontDescription *desc;
   PangoLayout *layout;
-  PangoRectangle ink, pink, logical;
+  PangoRectangle ink, logical;
   int baseline;
   cairo_surface_t *surface;
   cairo_t *cr;
@@ -37,6 +47,8 @@ update_image (void)
   cairo_font_options_t *fopt;
   cairo_hint_style_t hintstyle;
   cairo_hint_metrics_t hintmetrics;
+  cairo_antialias_t antialias;
+  cairo_path_t *path;
 
   if (!context)
     context = gtk_widget_create_pango_context (image);
@@ -65,6 +77,13 @@ update_image (void)
     hintmetrics = CAIRO_HINT_METRICS_OFF;
   cairo_font_options_set_hint_metrics (fopt, hintmetrics);
 
+  if (gtk_check_button_get_active (GTK_CHECK_BUTTON (anti_alias)))
+    antialias = CAIRO_ANTIALIAS_GRAY;
+  else
+    antialias = CAIRO_ANTIALIAS_NONE;
+  cairo_font_options_set_antialias (fopt, antialias);
+
+  pango_context_set_round_glyph_positions (context, hintmetrics == CAIRO_HINT_METRICS_ON);
   pango_cairo_context_set_font_options (context, fopt);
   cairo_font_options_destroy (fopt);
   pango_context_changed (context);
@@ -75,7 +94,6 @@ update_image (void)
       pango_layout_set_font_description (layout, desc);
       pango_layout_set_text (layout, text, -1);
       pango_layout_get_extents (layout, &ink, &logical);
-      pink = ink;
       baseline = pango_layout_get_baseline (layout);
 
       pango_extents_to_pixels (&ink, NULL);
@@ -85,10 +103,14 @@ update_image (void)
       cairo_set_source_rgb (cr, 1, 1, 1);
       cairo_paint (cr);
 
-      cairo_set_source_rgb (cr, 0, 0, 0);
+      cairo_set_source_rgba (cr, 0, 0, 0, pixel_alpha);
+
       cairo_move_to (cr, 10, 10);
       pango_cairo_show_layout (cr, layout);
 
+      pango_cairo_layout_path (cr, layout);
+      path = cairo_copy_path (cr);
+
       cairo_destroy (cr);
       g_object_unref (layout);
 
@@ -127,7 +149,7 @@ update_image (void)
 
       if (gtk_check_button_get_active (GTK_CHECK_BUTTON (show_extents)))
         {
-          cairo_set_source_rgba (cr, 0, 0, 1, 1);
+          cairo_set_source_rgb (cr, 0, 0, 1);
 
           cairo_rectangle (cr,
                            scale * (10 + pango_units_to_double (logical.x)) - 0.5,
@@ -140,17 +162,45 @@ update_image (void)
           cairo_line_to (cr, scale * (10 + pango_units_to_double (logical.x + logical.width)) + 1,
                              scale * (10 + pango_units_to_double (baseline)) - 0.5);
           cairo_stroke (cr);
-          cairo_set_source_rgba (cr, 1, 0, 0, 1);
+          cairo_set_source_rgb (cr, 1, 0, 0);
           cairo_rectangle (cr,
-                           scale * (10 + pango_units_to_double (pink.x)) + 0.5,
-                           scale * (10 + pango_units_to_double (pink.y)) + 0.5,
-                           scale * pango_units_to_double (pink.width) - 1,
-                           scale * pango_units_to_double (pink.height) - 1);
+                           scale * (10 + ink.x) - 0.5,
+                           scale * (10 + ink.y) - 0.5,
+                           scale * ink.width + 1,
+                           scale * ink.height + 1);
           cairo_stroke (cr);
         }
 
+      for (int i = 0; i < path->num_data; i += path->data[i].header.length)
+        {
+          cairo_path_data_t *data = &path->data[i];
+          switch (data->header.type)
+            {
+            case CAIRO_PATH_CURVE_TO:
+              data[3].point.x *= scale; data[3].point.y *= scale;
+              data[2].point.x *= scale; data[2].point.y *= scale;
+              data[1].point.x *= scale; data[1].point.y *= scale;
+              break;
+            case CAIRO_PATH_LINE_TO:
+            case CAIRO_PATH_MOVE_TO:
+              data[1].point.x *= scale; data[1].point.y *= scale;
+              break;
+            case CAIRO_PATH_CLOSE_PATH:
+              break;
+            default:
+              g_assert_not_reached ();
+            }
+        }
+
+      cairo_set_source_rgba (cr, 0, 0, 0, outline_alpha);
+      cairo_move_to (cr, scale * 20 - 0.5, scale * 20 - 0.5);
+      cairo_append_path (cr, path);
+      cairo_stroke (cr);
+
       cairo_surface_destroy (surface);
       cairo_destroy (cr);
+
+      cairo_path_destroy (path);
     }
   else
     {
@@ -158,10 +208,26 @@ update_image (void)
       PangoLayoutRun *run;
       PangoGlyphInfo *g;
       int i, j;
+      GString *str;
+      gunichar ch;
+
+      if (*text == '\0')
+        text = " ";
+
+      ch = g_utf8_get_char (text);
+
+      str = g_string_new ("");
+
+      for (i = 0; i < 4; i++)
+        {
+          g_string_append_unichar (str, ch);
+          g_string_append_unichar (str, 0x200c);
+        }
 
       layout = pango_layout_new (context);
       pango_layout_set_font_description (layout, desc);
-      pango_layout_set_text (layout, "aaaa", -1);
+      pango_layout_set_text (layout, str->str, -1);
+      g_string_free (str, TRUE);
       pango_layout_get_extents (layout, &ink, &logical);
       pango_extents_to_pixels (&logical, NULL);
 
@@ -176,7 +242,7 @@ update_image (void)
       cairo_set_source_rgb (cr, 0, 0, 0);
       for (i = 0; i < 4; i++)
         {
-          g = &(run->glyphs->glyphs[i]);
+          g = &(run->glyphs->glyphs[2*i]);
           g->geometry.width = PANGO_UNITS_ROUND (g->geometry.width * 3 / 2);
         }
 
@@ -184,7 +250,7 @@ update_image (void)
         {
           for (i = 0; i < 4; i++)
             {
-              g = &(run->glyphs->glyphs[i]);
+              g = &(run->glyphs->glyphs[2*i]);
               g->geometry.x_offset = i * (PANGO_SCALE / 4);
               g->geometry.y_offset = j * (PANGO_SCALE / 4);
             }
@@ -203,7 +269,6 @@ update_image (void)
       cairo_surface_destroy (surface);
     }
 
-
   gtk_picture_set_pixbuf (GTK_PICTURE (image), pixbuf2);
 
   g_object_unref (pixbuf2);
@@ -211,6 +276,78 @@ update_image (void)
   pango_font_description_free (desc);
 }
 
+static gboolean fading = FALSE;
+static double start_pixel_alpha;
+static double end_pixel_alpha;
+static double start_outline_alpha;
+static double end_outline_alpha;
+static gint64 start_time;
+static gint64 end_time;
+
+static double
+ease_out_cubic (double t)
+{
+  double p = t - 1;
+  return p * p * p + 1;
+}
+
+static gboolean
+change_alpha (GtkWidget     *widget,
+              GdkFrameClock *clock,
+              gpointer       user_data)
+{
+  gint64 now = g_get_monotonic_time ();
+  double t;
+
+  t = ease_out_cubic ((now - start_time) / (double) (end_time - start_time));
+
+  pixel_alpha = start_pixel_alpha + (end_pixel_alpha - start_pixel_alpha) * t;
+  outline_alpha = start_outline_alpha + (end_outline_alpha - start_outline_alpha) * t;
+
+  update_image ();
+
+  if (now >= end_time)
+    {
+      fading = FALSE;
+      return G_SOURCE_REMOVE;
+    }
+
+  return G_SOURCE_CONTINUE;
+}
+
+static void
+start_alpha_fade (void)
+{
+  gboolean pixels;
+  gboolean outlines;
+
+  if (fading)
+    return;
+
+  pixels = gtk_check_button_get_active (GTK_CHECK_BUTTON (show_pixels));
+  outlines = gtk_check_button_get_active (GTK_CHECK_BUTTON (show_outlines));
+
+  start_pixel_alpha = pixel_alpha;
+  if (pixels && outlines)
+    end_pixel_alpha = 0.5;
+  else if (pixels)
+    end_pixel_alpha = 1;
+  else
+    end_pixel_alpha = 0;
+
+  start_outline_alpha = outline_alpha;
+  if (outlines)
+    end_outline_alpha = 1.0;
+  else
+    end_outline_alpha = 0.0;
+
+  start_time = g_get_monotonic_time ();
+  end_time = start_time + G_TIME_SPAN_SECOND / 2;
+
+  fading = TRUE;
+  gtk_widget_add_tick_callback (window, change_alpha, NULL, NULL);
+}
+
 static void
 update_buttons (void)
 {
@@ -218,20 +355,26 @@ update_buttons (void)
   gtk_widget_set_sensitive (down_button, scale > 1);
 }
 
-static void
-scale_up (void)
+static gboolean
+scale_up (GtkWidget *widget,
+          GVariant  *args,
+          gpointer   user_data)
 {
   scale += 1;
   update_buttons ();
   update_image ();
+  return TRUE;
 }
 
-static void
-scale_down (void)
+static gboolean
+scale_down (GtkWidget *widget,
+            GVariant  *args,
+            gpointer   user_data)
 {
   scale -= 1;
   update_buttons ();
   update_image ();
+  return TRUE;
 }
 
 GtkWidget *
@@ -252,20 +395,26 @@ do_fontrendering (GtkWidget *do_widget)
       entry = GTK_WIDGET (gtk_builder_get_object (builder, "entry"));
       image = GTK_WIDGET (gtk_builder_get_object (builder, "image"));
       hinting = GTK_WIDGET (gtk_builder_get_object (builder, "hinting"));
+      anti_alias = GTK_WIDGET (gtk_builder_get_object (builder, "antialias"));
       hint_metrics = GTK_WIDGET (gtk_builder_get_object (builder, "hint_metrics"));
       text_radio = GTK_WIDGET (gtk_builder_get_object (builder, "text_radio"));
       show_grid = GTK_WIDGET (gtk_builder_get_object (builder, "show_grid"));
       show_extents = GTK_WIDGET (gtk_builder_get_object (builder, "show_extents"));
+      show_pixels = GTK_WIDGET (gtk_builder_get_object (builder, "show_pixels"));
+      show_outlines = GTK_WIDGET (gtk_builder_get_object (builder, "show_outlines"));
 
       g_signal_connect (up_button, "clicked", G_CALLBACK (scale_up), NULL);
       g_signal_connect (down_button, "clicked", G_CALLBACK (scale_down), NULL);
       g_signal_connect (entry, "notify::text", G_CALLBACK (update_image), NULL);
       g_signal_connect (font_button, "notify::font-desc", G_CALLBACK (update_image), NULL);
       g_signal_connect (hinting, "notify::active", G_CALLBACK (update_image), NULL);
+      g_signal_connect (anti_alias, "notify::active", G_CALLBACK (update_image), NULL);
       g_signal_connect (hint_metrics, "notify::active", G_CALLBACK (update_image), NULL);
       g_signal_connect (text_radio, "notify::active", G_CALLBACK (update_image), NULL);
       g_signal_connect (show_grid, "notify::active", G_CALLBACK (update_image), NULL);
       g_signal_connect (show_extents, "notify::active", G_CALLBACK (update_image), NULL);
+      g_signal_connect (show_pixels, "notify::active", G_CALLBACK (start_alpha_fade), NULL);
+      g_signal_connect (show_outlines, "notify::active", G_CALLBACK (start_alpha_fade), NULL);
 
       update_image ();
 

demos/gtk-demo/fontrendering.ui

@@ -1,13 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <object class="GtkAdjustment" id="scale_adj">
-    <property name="upper">24</property>
-    <property name="step-increment">1</property>
-    <property name="page-increment">4</property>
-  </object>
   <object class="GtkWindow" id="window">
-    <property name="default-width">1080</property>
-    <property name="default-height">430</property>
+    <property name="default-width">1024</property>
+    <property name="default-height">768</property>
     <child type="titlebar">
       <object class="GtkHeaderBar">
         <child type="title">
@@ -87,35 +82,62 @@
               </object>
             </child>
             <child>
-              <object class="GtkLabel">
-                <property name="label">Hinting</property>
-                <property name="xalign">1</property>
-                <style>
-                  <class name="dim-label"/>
-                </style>
+              <object class="GtkCheckButton" id="show_pixels">
+                <property name="label">Show _Pixels</property>
+                <property name="use-underline">1</property>
+                <property name="active">1</property>
                 <layout>
                   <property name="column">3</property>
+                  <property name="row">0</property>
                 </layout>
               </object>
             </child>
             <child>
-              <object class="GtkComboBoxText" id="hinting">
-                <property name="active">0</property>
-                <property name="valign">center</property>
-                <items>
-                  <item translatable="yes" id="none">None</item>
-                  <item translatable="yes" id="slight">Slight</item>
-                  <item translatable="yes" id="medium">Medium</item>
-                  <item translatable="yes" id="full">Full</item>
-                </items>
+              <object class="GtkCheckButton" id="show_outlines">
+                <property name="label">Show _Outline</property>
+                <property name="use-underline">1</property>
+                <layout>
+                  <property name="column">3</property>
+                  <property name="row">1</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkBox">
+                <property name="spacing">6</property>
+                <child>
+                  <object class="GtkLabel">
+                    <property name="label">_Hinting</property>
+                    <property name="use-underline">1</property>
+                    <property name="mnemonic-widget">hinting</property>
+                    <style>
+                      <class name="dim-label"/>
+                    </style>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkComboBoxText" id="hinting">
+                    <property name="active">0</property>
+                    <property name="valign">center</property>
+                    <items>
+                      <item translatable="yes" id="none">None</item>
+                      <item translatable="yes" id="slight">Slight</item>
+                      <item translatable="yes" id="medium">Medium</item>
+                      <item translatable="yes" id="full">Full</item>
+                    </items>
+                  </object>
+                </child>
                 <layout>
                   <property name="column">4</property>
+                  <property name="column-span">2</property>
                 </layout>
               </object>
             </child>
             <child>
-              <object class="GtkCheckButton" id="hint_metrics">
-                <property name="label">Hint Metrics</property>
+              <object class="GtkCheckButton" id="antialias">
+                <property name="label">_Antialias</property>
+                <property name="use-underline">1</property>
+                <property name="active">1</property>
                 <layout>
                   <property name="column">4</property>
                   <property name="row">1</property>
@@ -123,21 +145,31 @@
               </object>
             </child>
             <child>
-              <object class="GtkCheckButton" id="show_extents">
-                <property name="label">Show Extents</property>
-                <property name="active">1</property>
+              <object class="GtkCheckButton" id="hint_metrics">
+                <property name="label">Hint _Metrics</property>
+                <property name="use-underline">1</property>
                 <layout>
                   <property name="column">5</property>
+                  <property name="row">1</property>
+                </layout>
+              </object>
+            </child>
+            <child>
+              <object class="GtkCheckButton" id="show_extents">
+                <property name="label">Show _Extents</property>
+                <property name="use-underline">1</property>
+                <layout>
+                  <property name="column">6</property>
                   <property name="row">0</property>
                 </layout>
               </object>
             </child>
             <child>
               <object class="GtkCheckButton" id="show_grid">
-                <property name="active">1</property>
-                <property name="label">Show Grid</property>
+                <property name="label">Show _Grid</property>
+                <property name="use-underline">1</property>
                 <layout>
-                  <property name="column">5</property>
+                  <property name="column">6</property>
                   <property name="row">1</property>
                 </layout>
               </object>
@@ -145,11 +177,24 @@
             <child>
               <object class="GtkButton" id="up_button">
                 <property name="icon-name">list-add-symbolic</property>
+                <property name="halign">center</property>
+                <property name="valign">center</property>
                 <style>
                   <class name="circular"/>
                 </style>
+                <child>
+                  <object class="GtkShortcutController">
+                    <property name="scope">managed</property>
+                    <child>
+                      <object class="GtkShortcut">
+                        <property name="trigger">&lt;Control&gt;plus</property>
+                        <property name="action">activate</property>
+                      </object>
+                    </child>
+                  </object>
+                </child>
                 <layout>
-                  <property name="column">6</property>
+                  <property name="column">7</property>
                   <property name="row">0</property>
                 </layout>
               </object>
@@ -157,11 +202,24 @@
             <child>
               <object class="GtkButton" id="down_button">
                 <property name="icon-name">list-remove-symbolic</property>
+                <property name="halign">center</property>
+                <property name="valign">center</property>
                 <style>
                   <class name="circular"/>
                 </style>
+                <child>
+                  <object class="GtkShortcutController">
+                    <property name="scope">managed</property>
+                    <child>
+                      <object class="GtkShortcut">
+                        <property name="trigger">&lt;Control&gt;minus</property>
+                        <property name="action">activate</property>
+                      </object>
+                    </child>
+                  </object>
+                </child>
                 <layout>
-                  <property name="column">6</property>
+                  <property name="column">7</property>
                   <property name="row">1</property>
                 </layout>
               </object>
@@ -170,7 +228,7 @@
               <object class="GtkLabel">
                 <property name="hexpand">1</property>
                 <layout>
-                  <property name="column">7</property>
+                  <property name="column">8</property>
                 </layout>
               </object>
             </child>

demos/gtk-demo/hypertext.c

@@ -61,12 +61,26 @@ show_page (GtkTextView *text_view,
            int          page)
 {
   GtkTextBuffer *buffer;
-  GtkTextIter iter;
+  GtkTextIter iter, start;
+  GtkTextMark *mark;
   GtkWidget *child;
   GtkTextChildAnchor *anchor;
   GtkEventController *controller;
+  GtkTextTag *bold, *mono, *nobreaks;
 
   buffer = gtk_text_view_get_buffer (text_view);
+
+  bold = gtk_text_buffer_create_tag (buffer, NULL,
+                                     "weight", PANGO_WEIGHT_BOLD,
+                                     "scale", PANGO_SCALE_X_LARGE,
+                                     NULL);
+  mono = gtk_text_buffer_create_tag (buffer, NULL,
+                                     "family", "monospace",
+                                     NULL);
+  nobreaks = gtk_text_buffer_create_tag (buffer, NULL,
+                                         "allow-breaks", FALSE,
+                                         NULL);
+
   gtk_text_buffer_set_text (buffer, "", 0);
   gtk_text_buffer_get_iter_at_offset (buffer, &iter, 0);
   gtk_text_buffer_begin_irreversible_action (buffer);
@@ -104,17 +118,22 @@ show_page (GtkTextView *text_view,
     }
   else if (page == 2)
     {
-      GtkTextTag *tag;
+      mark = gtk_text_buffer_create_mark (buffer, "mark", &iter, TRUE);
 
-      tag = gtk_text_buffer_create_tag (buffer, NULL,
-                                        "weight", PANGO_WEIGHT_BOLD,
-                                        "scale", PANGO_SCALE_X_LARGE,
-                                        NULL);
-      gtk_text_buffer_insert_with_tags (buffer, &iter, "tag", -1, tag, NULL);
-      tag = gtk_text_buffer_create_tag (buffer, NULL,
-                                        "family", "monospace",
-                                        NULL);
-      gtk_text_buffer_insert_with_tags (buffer, &iter, " / tag / ", -1, tag, NULL);
+      gtk_text_buffer_insert_with_tags (buffer, &iter, "tag", -1, bold, NULL);
+      gtk_text_buffer_insert (buffer, &iter, " /", -1);
+
+      gtk_text_buffer_get_iter_at_mark (buffer, &start, mark);
+      gtk_text_buffer_apply_tag (buffer, nobreaks, &start, &iter);
+      gtk_text_buffer_insert (buffer, &iter, " ", -1);
+
+      gtk_text_buffer_move_mark (buffer, mark, &iter);
+      gtk_text_buffer_insert_with_tags (buffer, &iter, "tag", -1, mono, NULL);
+      gtk_text_buffer_insert (buffer, &iter, " /", -1);
+
+      gtk_text_buffer_get_iter_at_mark (buffer, &start, mark);
+      gtk_text_buffer_apply_tag (buffer, nobreaks, &start, &iter);
+      gtk_text_buffer_insert (buffer, &iter, " ", -1);
 
       anchor = gtk_text_buffer_create_child_anchor (buffer, &iter);
       child = gtk_image_new_from_icon_name ("audio-volume-high-symbolic");
@@ -132,20 +151,26 @@ show_page (GtkTextView *text_view,
           "behavior of mouse and key presses, “lock” a range of text so the "
           "user can't edit it, or countless other things.\n", -1);
       insert_link (buffer, &iter, "Go back", 1);
+
+      gtk_text_buffer_delete_mark (buffer, mark);
     }
   else if (page == 3)
     {
-      GtkTextTag *tag;
+      mark = gtk_text_buffer_create_mark (buffer, "mark", &iter, TRUE);
 
-      tag = gtk_text_buffer_create_tag (buffer, NULL,
-                                        "weight", PANGO_WEIGHT_BOLD,
-                                        "scale", PANGO_SCALE_X_LARGE,
-                                        NULL);
-      gtk_text_buffer_insert_with_tags (buffer, &iter, "hypertext", -1, tag, NULL);
-      tag = gtk_text_buffer_create_tag (buffer, NULL,
-                                        "family", "monospace",
-                                        NULL);
-      gtk_text_buffer_insert_with_tags (buffer, &iter, " / ˈhaɪ pərˌtɛkst / ", -1, tag, NULL);
+      gtk_text_buffer_insert_with_tags (buffer, &iter, "hypertext", -1, bold, NULL);
+      gtk_text_buffer_insert (buffer, &iter, " /", -1);
+
+      gtk_text_buffer_get_iter_at_mark (buffer, &start, mark);
+      gtk_text_buffer_apply_tag (buffer, nobreaks, &start, &iter);
+      gtk_text_buffer_insert (buffer, &iter, " ", -1);
+
+      gtk_text_buffer_move_mark (buffer, mark, &iter);
+      gtk_text_buffer_insert_with_tags (buffer, &iter, "ˈhaɪ pərˌtɛkst", -1, mono, NULL);
+      gtk_text_buffer_insert (buffer, &iter, " /", -1);
+      gtk_text_buffer_get_iter_at_mark (buffer, &start, mark);
+      gtk_text_buffer_apply_tag (buffer, nobreaks, &start, &iter);
+      gtk_text_buffer_insert (buffer, &iter, " ", -1);
 
       anchor = gtk_text_buffer_create_child_anchor (buffer, &iter);
       child = gtk_image_new_from_icon_name ("audio-volume-high-symbolic");
@@ -159,6 +184,8 @@ show_page (GtkTextView *text_view,
           "Machine-readable text that is not sequential but is organized "
           "so that related items of information are connected.\n", -1);
       insert_link (buffer, &iter, "Go back", 1);
+
+      gtk_text_buffer_delete_mark (buffer, mark);
     }
   gtk_text_buffer_end_irreversible_action (buffer);
 }
@@ -358,7 +385,7 @@ do_hypertext (GtkWidget *do_widget)
 
       sw = gtk_scrolled_window_new ();
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
-                                      GTK_POLICY_AUTOMATIC,
+                                      GTK_POLICY_NEVER,
                                       GTK_POLICY_AUTOMATIC);
       gtk_window_set_child (GTK_WINDOW (window), sw);
       gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), view);

demos/gtk-demo/listbox.c

@@ -8,7 +8,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-static GdkPixbuf *avatar_pixbuf_other;
+static GdkTexture *avatar_texture_other;
 static GtkWidget *window = NULL;
 
 #define GTK_TYPE_MESSAGE		  (gtk_message_get_type ())
@@ -196,12 +196,9 @@ gtk_message_row_update (GtkMessageRow *row)
     gtk_button_set_label (GTK_BUTTON (priv->resent_by_button), priv->message->resent_by);
 
   if (strcmp (priv->message->sender_nick, "@GTKtoolkit") == 0)
-    {
-      gtk_image_set_from_icon_name (priv->avatar_image, "org.gtk.Demo4");
-      gtk_image_set_icon_size (priv->avatar_image, GTK_ICON_SIZE_LARGE);
-    }
+    gtk_image_set_from_icon_name (priv->avatar_image, "org.gtk.Demo4");
   else
-    gtk_image_set_from_pixbuf (priv->avatar_image, avatar_pixbuf_other);
+    gtk_image_set_from_paintable (priv->avatar_image, GDK_PAINTABLE (avatar_texture_other));
 
 }
 
@@ -344,7 +341,7 @@ do_listbox (GtkWidget *do_widget)
 
   if (!window)
     {
-      avatar_pixbuf_other = gdk_pixbuf_new_from_resource_at_scale ("/listbox/apple-red.png", 32, 32, FALSE, NULL);
+      avatar_texture_other = gdk_texture_new_from_resource ("/listbox/apple-red.png");
 
       window = gtk_window_new ();
       gtk_window_set_display (GTK_WINDOW (window),

demos/gtk-demo/listbox.ui

@@ -25,6 +25,7 @@
             <property name="margin-start">8</property>
             <property name="margin-end">8</property>
             <property name="icon-name">image-missing</property>
+            <property name="icon-size">large</property>
             <layout>
               <property name="column">0</property>
               <property name="row">0</property>

demos/gtk-demo/markup.c

@@ -58,7 +58,7 @@ do_markup (GtkWidget *do_widget)
       window = gtk_window_new ();
       gtk_window_set_display (GTK_WINDOW (window),
                               gtk_widget_get_display (do_widget));
-      gtk_window_set_default_size (GTK_WINDOW (window), 450, 450);
+      gtk_window_set_default_size (GTK_WINDOW (window), 600, 680);
       g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
 
       stack = gtk_stack_new ();

demos/gtk-demo/markup.txt

@@ -1,5 +1,9 @@
 
-Text sizes: <span size="xx-small">tiny</span> <span size="x-small">very small</span> <span size="small">small</span> <span size="medium">normal</span> <span size="large">large</span> <span size="x-large">very large</span> <span size="xx-large">huge</span>
+Text sizes: <span size="xx-small">tiny </span><span size="x-small">very small </span><span size="small">small </span><span size="medium">normal </span><span size="large">large </span><span size="x-large">very large </span><span size="xx-large">huge</span>
+
+Text styles: <span style="normal">Normal</span> <span style="italic">Italic</span> <span style="oblique">Olique</span>
+
+Text weights: <span weight="thin">thin</span> <span weight="light">light</span> <span weight="normal">normal</span> <span weight="bold">bold</span> <span weight="ultraheavy">ultraheavy</span>
 
 Text <span color="gray">c<span color="green">o</span>l<span color="tomato">o</span>rs</span> and <span background="pink">backgrounds</span>
 
@@ -15,6 +19,12 @@ OpenType font features: <span font_desc="sans regular" font_features="dlig=0">fe
 
 Shortcuts: <tt>Monospace</tt> – <b>Bold</b> – <i>Italic</i> – <big>Big</big> – <small>Small</small> – <u>Underlined</u> – <s>Strikethrough</s> – Super<sup>script</sup> – Sub<sub>script</sub>
 
-<span allow_breaks="false">A</span> hy­phen­ation al­go­rithm is a set of rules, espe­ci­ally one co­di­fied for im­ple­men­tation in a com­pu­ter pro­gram, that de­ci­des at which points a word can be bro­ken over two lines with a hy­phen. For ex­am­ple, a hy­phen­ation al­go­rithm might de­cide that im­peach­ment can be broken as <span allow_breaks="false">impeach‧ment</span> or <span allow_breaks="false">im‧peachment</span> but not <span allow_breaks="false">impe‧achment.</span>
+hy­phen­ation al­go­rithm is a <span allow_breaks="false" style="italic">set of rules</span>, espe­ci­ally one co­di­fied for im­ple­men­tation in a com­pu­ter pro­gram, that de­ci­des at which points a word can be bro­ken over two lines with a hy­phen. For ex­am­ple, a hy­phen­ation al­go­rithm might de­cide that im­peach­ment can be broken as impeach‧ment or im‧peachment but not impe‧achment.
 
 <span insert_hyphens="false">one/two three/four five/six seven/eight nine/ten</span>
+
+<span line_height='1.33'>Line height: This is an example of widely spaced text. It was achieved by setting the line-height factor to 1.33. You can set the line-height factor to any value between 0 and 10.
+Note that the line height affects the spacing between paragraphs as well as between the wrapped lines inside a paragraph.</span>
+
+Transforms: <span text_transform='uppercase'>straße</span> <span text_transform='capitalize'>up, up and away</span>
+

demos/gtk-demo/menu.c

@@ -21,8 +21,10 @@ do_menu (GtkWidget *do_widget)
 
   if (!window)
     {
+      GtkWidget *box;
       GtkWidget *sw;
       GtkWidget *widget;
+      GtkWidget *scale;
 
       window = gtk_window_new ();
       gtk_window_set_title (GTK_WINDOW (window), "Menu");
@@ -31,11 +33,23 @@ do_menu (GtkWidget *do_widget)
                               gtk_widget_get_display (do_widget));
       g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
 
+      box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+      gtk_window_set_child (GTK_WINDOW (window), box);
+
       sw = gtk_scrolled_window_new ();
-      gtk_window_set_child (GTK_WINDOW (window), sw);
+      gtk_widget_set_vexpand (sw, TRUE);
+      gtk_box_append (GTK_BOX (box), sw);
 
       widget = demo3_widget_new ("/transparent/portland-rose.jpg");
       gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), widget);
+
+      scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0.01, 10.0, 0.1);
+      gtk_range_set_value (GTK_RANGE (scale), 1.0);
+      gtk_box_append (GTK_BOX (box), scale);
+
+      g_object_bind_property (gtk_range_get_adjustment (GTK_RANGE (scale)), "value",
+                              widget, "scale",
+                              G_BINDING_BIDIRECTIONAL);
     }
 
   if (!gtk_widget_get_visible (window))

demos/gtk-demo/meson.build

@@ -67,6 +67,7 @@ demos = files([
   'paintable_animated.c',
   'paintable_emblem.c',
   'paintable_mediastream.c',
+  'paintable_symbolic.c',
   'panes.c',
   'password_entry.c',
   'peg_solitaire.c',

demos/gtk-demo/org.gtk.Demo4.appdata.xml.in

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.Demo4.desktop</id>
+  <id>org.gtk.Demo4</id>
+  <launchable type="desktop-id">org.gtk.Demo4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Demo</name>
   <summary>Program to demonstrate GTK functions</summary>
   <description>
@@ -30,6 +31,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>

demos/gtk-demo/paintable.c

@@ -45,26 +45,27 @@ struct _GtkNuclearIconClass
  * so that it can be called from all the other demos, too.
  */
 void
-gtk_nuclear_snapshot (GtkSnapshot *snapshot,
-                      double       width,
-                      double       height,
-                      double       rotation,
-                      gboolean     draw_background)
+gtk_nuclear_snapshot (GtkSnapshot   *snapshot,
+                      const GdkRGBA *foreground,
+                      const GdkRGBA *background,
+                      double         width,
+                      double         height,
+                      double         rotation)
 {
 #define RADIUS 0.3
   cairo_t *cr;
   double size;
 
-  if (draw_background)
-    gtk_snapshot_append_color (snapshot,
-                               &(GdkRGBA) { 0.9, 0.75, 0.15, 1.0 },
-                               &GRAPHENE_RECT_INIT (0, 0, width, height));
+  gtk_snapshot_append_color (snapshot,
+                             background,
+                             &GRAPHENE_RECT_INIT (0, 0, width, height));
 
   size = MIN (width, height);
   cr = gtk_snapshot_append_cairo (snapshot,
                                   &GRAPHENE_RECT_INIT ((width - size) / 2.0,
                                                        (height - size) / 2.0,
                                                        size, size));
+  gdk_cairo_set_source_rgba (cr, foreground);
   cairo_translate (cr, width / 2.0, height / 2.0);
   cairo_scale (cr, size, size);
   cairo_rotate (cr, rotation);
@@ -94,9 +95,10 @@ gtk_nuclear_icon_snapshot (GdkPaintable *paintable,
    */
 
   gtk_nuclear_snapshot (snapshot,
+                        &(GdkRGBA) { 0, 0, 0, 1 }, /* black */
+                        &(GdkRGBA) { 0.9, 0.75, 0.15, 1.0 }, /* yellow */
                         width, height,
-                        nuclear->rotation,
-                        TRUE);
+                        nuclear->rotation);
 }
 
 static GdkPaintableFlags

demos/gtk-demo/paintable.h

@@ -4,10 +4,11 @@
 #include <gtk/gtk.h>
 
 void            gtk_nuclear_snapshot           (GtkSnapshot     *snapshot,
+                                                const GdkRGBA   *foreground,
+                                                const GdkRGBA   *background,
                                                 double           width,
                                                 double           height,
-                                                double           rotation,
-                                                gboolean         draw_background);
+                                                double           rotation);
 
 GdkPaintable *  gtk_nuclear_icon_new            (double          rotation);
 GdkPaintable *  gtk_nuclear_animation_new       (gboolean        draw_background);

demos/gtk-demo/paintable_animated.c

@@ -65,9 +65,12 @@ gtk_nuclear_animation_snapshot (GdkPaintable *paintable,
 
   /* We call the function from the previous example here. */
   gtk_nuclear_snapshot (snapshot,
+                        &(GdkRGBA) { 0, 0, 0, 1 }, /* black */
+                        nuclear->draw_background
+                          ? &(GdkRGBA) { 0.9, 0.75, 0.15, 1.0 } /* yellow */
+                          : &(GdkRGBA) { 0, 0, 0, 0 }, /* transparent */
                         width, height,
-                        2 * G_PI * nuclear->progress / MAX_PROGRESS,
-                        nuclear->draw_background);
+                        2 * G_PI * nuclear->progress / MAX_PROGRESS);
 }
 
 static GdkPaintable *

demos/gtk-demo/paintable_mediastream.c

@@ -73,9 +73,10 @@ gtk_nuclear_media_stream_snapshot (GdkPaintable *paintable,
 
   /* We call the function from the previous example here. */
   gtk_nuclear_snapshot (snapshot,
+                        &(GdkRGBA) { 0, 0, 0, 1 }, /* black */
+                        &(GdkRGBA) { 0.9, 0.75, 0.15, 1.0 }, /* yellow */
                         width, height,
-                        2 * G_PI * nuclear->progress / DURATION,
-                        TRUE);
+                        2 * G_PI * nuclear->progress / DURATION);
 }
 
 static GdkPaintable *

demos/gtk-demo/paintable_symbolic.c

@@ -0,0 +1,208 @@
+/* Paintable/Symbolic Paintable
+ *
+ * GdkPaintables can be made to follow the theme's colors. GTK calls
+ * icons that do this symbolic icons, paintables that want to have
+ * the same effect can implement the GtkSymbolicPaintable interface.
+ *
+ * We will adapt the original paintable example by adding the ability
+ * to recolor the paintable based on the symbolic colors.
+ */
+
+#include <gtk/gtk.h>
+
+#include "paintable.h"
+
+static GtkWidget *window = NULL;
+
+/* First, add the boilerplate for the object itself.
+ * This part would normally go in the header.
+ */
+#define GTK_TYPE_NUCLEAR_SYMBOLIC (gtk_nuclear_symbolic_get_type ())
+G_DECLARE_FINAL_TYPE (GtkNuclearSymbolic, gtk_nuclear_symbolic, GTK, NUCLEAR_SYMBOLIC, GObject)
+
+/* Declare a few warning levels, so we can pick colors based on them */
+typedef enum
+{
+  WARNING_NONE,
+  WARNING_ALERT,
+  WARNING_EMERGENCY
+} WarningLevel;
+
+/* Declare the struct. */
+struct _GtkNuclearSymbolic
+{
+  GObject parent_instance;
+
+  WarningLevel warning_level;
+};
+
+struct _GtkNuclearSymbolicClass
+{
+  GObjectClass parent_class;
+};
+
+/* Add a function to draw the nuclear icon in the given colors */
+static void
+gtk_nuclear_symbolic_snapshot_symbolic (GtkSymbolicPaintable *paintable,
+                                        GdkSnapshot          *snapshot,
+                                        double                width,
+                                        double                height,
+                                        const GdkRGBA        *colors,
+                                        gsize                 n_colors)
+{
+  GtkNuclearSymbolic *self = GTK_NUCLEAR_SYMBOLIC (paintable);
+  static const GdkRGBA transparent = { 0, };
+  const GdkRGBA *bg_color;
+
+  /* select the right background color from the warning level */
+  switch (self->warning_level)
+  {
+    case WARNING_NONE:
+      bg_color = &transparent;
+      break;
+    case WARNING_ALERT:
+      bg_color = &colors[GTK_SYMBOLIC_COLOR_WARNING];
+      break;
+    case WARNING_EMERGENCY:
+      bg_color = &colors[GTK_SYMBOLIC_COLOR_ERROR];
+      break;
+    default:
+      /* This should never happen, but we better do defensive coding
+       * with this critical icon */
+      g_assert_not_reached ();
+      bg_color = &transparent;
+      break;
+  }
+
+  /* Draw the icon with the selected warning color */
+  gtk_nuclear_snapshot (snapshot,
+                        &colors[GTK_SYMBOLIC_COLOR_FOREGROUND],
+                        bg_color,
+                        width, height,
+                        0);
+}
+
+static void
+gtk_nuclear_symbolic_symbolic_paintable_init (GtkSymbolicPaintableInterface *iface)
+{
+  iface->snapshot_symbolic = gtk_nuclear_symbolic_snapshot_symbolic;
+}
+
+/* We need to implement the functionality required by the GdkPaintable interface */
+static void
+gtk_nuclear_symbolic_snapshot (GdkPaintable *paintable,
+                                GdkSnapshot  *snapshot,
+                                double        width,
+                                double        height)
+{
+  /* Calling this function without passing a color is a neat trick
+   * to make GTK use default colors and otherwise forward the call
+   * to the snapshotting function above.
+   */
+  gtk_symbolic_paintable_snapshot_symbolic (GTK_SYMBOLIC_PAINTABLE (paintable),
+                                            snapshot,
+                                            width, height,
+                                            NULL, 0);
+}
+
+static GdkPaintableFlags
+gtk_nuclear_symbolic_get_flags (GdkPaintable *paintable)
+{
+  /* This image has a static size, but the contents may change:
+   * We draw different things when the warning level changes.
+   */
+  return GDK_PAINTABLE_STATIC_SIZE;
+}
+
+static void
+gtk_nuclear_symbolic_paintable_init (GdkPaintableInterface *iface)
+{
+  iface->snapshot = gtk_nuclear_symbolic_snapshot;
+  iface->get_flags = gtk_nuclear_symbolic_get_flags;
+}
+
+/* When defining the GType, we need to implement bot the GdkPaintable
+ * and the GtkSymbolicPaintable interface */
+G_DEFINE_TYPE_WITH_CODE (GtkNuclearSymbolic, gtk_nuclear_symbolic, G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
+                                                gtk_nuclear_symbolic_paintable_init)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_SYMBOLIC_PAINTABLE,
+                                                gtk_nuclear_symbolic_symbolic_paintable_init))
+
+static void
+gtk_nuclear_symbolic_class_init (GtkNuclearSymbolicClass *klass)
+{
+}
+
+static void
+gtk_nuclear_symbolic_init (GtkNuclearSymbolic *nuclear)
+{
+}
+
+/* And finally, we add the simple constructor we declared in the header. */
+GdkPaintable *
+gtk_nuclear_symbolic_new (void)
+{
+  return g_object_new (GTK_TYPE_NUCLEAR_SYMBOLIC, NULL);
+}
+
+/* Add some fun feature to the button */
+static void
+nuclear_button_clicked (GtkButton          *button,
+                        GtkNuclearSymbolic *nuclear)
+{
+  if (nuclear->warning_level >= WARNING_EMERGENCY)
+    {
+      /* On maximum warning level, reset the warning */
+      nuclear->warning_level = WARNING_NONE;
+      /* And sometimes (but not always to confuse people)
+       * close the window.
+       */
+      if (g_random_boolean ())
+        gtk_window_close (GTK_WINDOW (window));
+    }
+  else
+    {
+      /* Otherwise just increase the warning level */
+      nuclear->warning_level++;
+    }
+
+  /* Don't forget to emit the signal causing the paintable to redraw.
+   * Changing the warning level changes the background color after all.
+   */
+  gdk_paintable_invalidate_contents (GDK_PAINTABLE (nuclear));
+}
+
+GtkWidget *
+do_paintable_symbolic (GtkWidget *do_widget)
+{
+  GdkPaintable *nuclear;
+  GtkWidget *image, *button;
+
+  if (!window)
+    {
+      window = gtk_window_new ();
+      gtk_window_set_display (GTK_WINDOW (window),
+                              gtk_widget_get_display (do_widget));
+      gtk_window_set_title (GTK_WINDOW (window), "Don't click!");
+      gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);
+      g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
+
+      button = gtk_button_new ();
+      gtk_window_set_child (GTK_WINDOW (window), button);
+
+      nuclear = gtk_nuclear_symbolic_new ();
+      image = gtk_image_new_from_paintable (nuclear);
+
+      gtk_button_set_child (GTK_BUTTON (button), image);
+      g_signal_connect (button, "clicked", G_CALLBACK (nuclear_button_clicked), nuclear);
+      g_object_unref (nuclear);
+    }
+
+  if (!gtk_widget_get_visible (window))
+    gtk_widget_show (window);
+  else
+    gtk_window_destroy (GTK_WINDOW (window));
+
+  return window;
+}

demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.IconBrowser4.desktop</id>
+  <id>org.gtk.IconBrowser4</id>
+  <launchable type="desktop-id">org.gtk.IconBrowser4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Icon Browser</name>
   <summary>Program to browse themed icons</summary>
   <description>
@@ -29,6 +30,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>

demos/node-editor/node-editor-window.c

@@ -24,7 +24,6 @@
 #include "gtkrendererpaintableprivate.h"
 
 #include "gsk/gskrendernodeparserprivate.h"
-#include "gsk/gl/gskglrenderer.h"
 #include "gsk/ngl/gsknglrenderer.h"
 #ifdef GDK_WINDOWING_BROADWAY
 #include "gsk/broadway/gskbroadwayrenderer.h"
@@ -61,7 +60,7 @@ struct _NodeEditorWindow
 
   GtkWidget *renderer_listbox;
   GListStore *renderers;
-  GdkPaintable *paintable;
+  GskRenderNode *node;
 
   GFileMonitor *file_monitor;
 
@@ -168,7 +167,6 @@ static void
 text_changed (GtkTextBuffer    *buffer,
               NodeEditorWindow *self)
 {
-  GskRenderNode *node;
   char *text;
   GBytes *bytes;
   GtkTextIter iter;
@@ -179,10 +177,12 @@ text_changed (GtkTextBuffer    *buffer,
   text_buffer_remove_all_tags (self->text_buffer);
   bytes = g_bytes_new_take (text, strlen (text));
 
+  g_clear_pointer (&self->node, gsk_render_node_unref);
+
   /* If this is too slow, go fix the parser performance */
-  node = gsk_render_node_deserialize (bytes, deserialize_error_func, self);
+  self->node = gsk_render_node_deserialize (bytes, deserialize_error_func, self);
   g_bytes_unref (bytes);
-  if (node)
+  if (self->node)
     {
       /* XXX: Is this code necessary or can we have API to turn nodes into paintables? */
       GtkSnapshot *snapshot;
@@ -191,10 +191,9 @@ text_changed (GtkTextBuffer    *buffer,
       guint i;
 
       snapshot = gtk_snapshot_new ();
-      gsk_render_node_get_bounds (node, &bounds);
+      gsk_render_node_get_bounds (self->node, &bounds);
       gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (- bounds.origin.x, - bounds.origin.y));
-      gtk_snapshot_append_node (snapshot, node);
-      gsk_render_node_unref (node);
+      gtk_snapshot_append_node (snapshot, self->node);
       paintable = gtk_snapshot_free_to_paintable (snapshot, &bounds.size);
       gtk_picture_set_paintable (GTK_PICTURE (self->picture), paintable);
       for (i = 0; i < g_list_model_get_n_items (G_LIST_MODEL (self->renderers)); i++)
@@ -338,15 +337,9 @@ text_view_query_tooltip_cb (GtkWidget        *widget,
 }
 
 static gboolean
-load_file_contents (NodeEditorWindow *self,
-                    GFile            *file)
+load_bytes (NodeEditorWindow *self,
+            GBytes           *bytes)
 {
-  GBytes *bytes;
-
-  bytes = g_file_load_bytes (file, NULL, NULL, NULL);
-  if (bytes == NULL)
-    return FALSE;
-
   if (!g_utf8_validate (g_bytes_get_data (bytes, NULL), g_bytes_get_size (bytes), NULL))
     {
       g_bytes_unref (bytes);
@@ -362,6 +355,105 @@ load_file_contents (NodeEditorWindow *self,
   return TRUE;
 }
 
+static gboolean
+load_file_contents (NodeEditorWindow *self,
+                    GFile            *file)
+{
+  GBytes *bytes;
+
+  bytes = g_file_load_bytes (file, NULL, NULL, NULL);
+  if (bytes == NULL)
+    return FALSE;
+
+  return load_bytes (self, bytes);
+}
+
+static GdkContentProvider *
+on_picture_drag_prepare_cb (GtkDragSource    *source,
+                            double            x,
+                            double            y,
+                            NodeEditorWindow *self)
+{
+  if (self->node == NULL)
+    return NULL;
+
+  return gdk_content_provider_new_typed (GSK_TYPE_RENDER_NODE, self->node);
+}
+
+static void
+on_picture_drop_read_done_cb (GObject      *source,
+                              GAsyncResult *res,
+                              gpointer      data)
+{
+  NodeEditorWindow *self = data;
+  GOutputStream *stream = G_OUTPUT_STREAM (source);
+  GdkDrop *drop = g_object_get_data (source, "drop");
+  GdkDragAction action = 0;
+  GBytes *bytes;
+
+  if (g_output_stream_splice_finish (stream, res, NULL) >= 0)
+    {
+      bytes = g_memory_output_stream_steal_as_bytes (G_MEMORY_OUTPUT_STREAM (stream));
+      if (load_bytes (self, bytes))
+        action = GDK_ACTION_COPY;
+    }
+
+  g_object_unref (self);
+  gdk_drop_finish (drop, action);
+  g_object_unref (drop);
+  return;
+}
+
+static void
+on_picture_drop_read_cb (GObject      *source,
+                         GAsyncResult *res,
+                         gpointer      data)
+{
+  NodeEditorWindow *self = data;
+  GdkDrop *drop = GDK_DROP (source);
+  GInputStream *input;
+  GOutputStream *output;
+
+  input = gdk_drop_read_finish (drop, res, NULL, NULL);
+  if (input == NULL)
+    {
+      g_object_unref (self);
+      gdk_drop_finish (drop, 0);
+      return;
+    }
+
+  output = g_memory_output_stream_new_resizable ();
+  g_object_set_data (G_OBJECT (output), "drop", drop);
+  g_object_ref (drop);
+
+  g_output_stream_splice_async (output,
+                                input,
+                                G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE | G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
+                                G_PRIORITY_DEFAULT,
+                                NULL,
+                                on_picture_drop_read_done_cb,
+                                self);
+  g_object_unref (output);
+  g_object_unref (input);
+}
+
+static gboolean
+on_picture_drop_cb (GtkDropTargetAsync *dest,
+                    GdkDrop            *drop,
+                    double              x,
+                    double              y,
+                    NodeEditorWindow   *self)
+{
+  gdk_drop_read_async (drop,
+                       (const char *[2]) { "application/x-gtk-render-node", NULL },
+                       G_PRIORITY_DEFAULT,
+                       NULL,
+                       on_picture_drop_read_cb,
+                       g_object_ref (self));
+
+  return TRUE;
+}
+
 static void
 file_changed_cb (GFileMonitor      *monitor,
                  GFile             *file,
@@ -736,6 +828,7 @@ node_editor_window_finalize (GObject *object)
 
   g_array_free (self->errors, TRUE);
 
+  g_clear_pointer (&self->node, gsk_render_node_unref);
   g_clear_object (&self->renderers);
 
   G_OBJECT_CLASS (node_editor_window_parent_class)->finalize (object);
@@ -778,12 +871,9 @@ node_editor_window_realize (GtkWidget *widget)
                                    NULL,
                                    "Default");
 #endif
-  node_editor_window_add_renderer (self,
-                                   gsk_gl_renderer_new (),
-                                   "OpenGL");
   node_editor_window_add_renderer (self,
                                    gsk_ngl_renderer_new (),
-                                   "NGL");
+                                   "OpenGL");
 #ifdef GDK_RENDERING_VULKAN
   node_editor_window_add_renderer (self,
                                    gsk_vulkan_renderer_new (),
@@ -848,6 +938,8 @@ node_editor_window_class_init (NodeEditorWindowClass *class)
   gtk_widget_class_bind_template_callback (widget_class, testcase_save_clicked_cb);
   gtk_widget_class_bind_template_callback (widget_class, testcase_name_entry_changed_cb);
   gtk_widget_class_bind_template_callback (widget_class, dark_mode_cb);
+  gtk_widget_class_bind_template_callback (widget_class, on_picture_drag_prepare_cb);
+  gtk_widget_class_bind_template_callback (widget_class, on_picture_drop_cb);
 }
 
 static GtkWidget *

demos/node-editor/node-editor-window.ui

@@ -198,8 +198,22 @@
                     <child>
                       <object class="GtkPicture" id="picture">
                         <property name="can-shrink">0</property>
+                        <property name="keep-aspect-ratio">1</property>
                         <property name="halign">center</property>
                         <property name="valign">center</property>
+                        <child>
+                          <object class="GtkDragSource">
+                            <property name="actions">copy</property>
+                            <signal name="prepare" handler="on_picture_drag_prepare_cb" swapped="no"/>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
+                    <child>
+                      <object class="GtkDropTargetAsync">
+                        <property name="actions">copy</property>
+                        <property name="formats">application/x-gtk-render-node</property>
+                        <signal name="drop" handler="on_picture_drop_cb" swapped="no"/>
                       </object>
                     </child>
                   </object>

demos/print-editor/org.gtk.PrintEditor4.appdata.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.PrintEditor4.desktop</id>
+  <id>org.gtk.PrintEditor4</id>
+  <launchable type="desktop-id">org.gtk.PrintEditor4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Print Editor</name>
   <summary>Program to demonstrate GTK printing</summary>
   <description>
@@ -24,6 +25,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="3.99.0" date="2020-07-30">
       <description>

demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop">
-  <id>org.gtk.WidgetFactory4.desktop</id>
+  <id>org.gtk.WidgetFactory4</id>
+  <launchable type="desktop-id">org.gtk.WidgetFactory4.desktop</launchable>
   <metadata_license>CC0-1.0</metadata_license>
-  <project_license>LGPL-2.0+</project_license>
+  <project_license>LGPL-2.1-or-later</project_license>
   <name>GTK Widget Factory</name>
   <summary>Program to demonstrate GTK functions</summary>
   <description>
@@ -31,6 +32,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>

demos/widget-factory/widget-factory.c

@@ -696,6 +696,37 @@ on_range_to_changed (GtkSpinButton *to)
     gtk_spin_button_set_value (from, v2);
 }
 
+static GdkContentProvider *
+on_picture_drag_prepare (GtkDragSource *source,
+                         double         x,
+                         double         y,
+                         gpointer       unused)
+{
+  GtkWidget *picture;
+
+  picture = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
+
+  return gdk_content_provider_new_typed (GDK_TYPE_TEXTURE, gtk_picture_get_paintable (GTK_PICTURE (picture)));
+}
+
+static gboolean
+on_picture_drop (GtkDropTarget *dest,
+                 const GValue  *value,
+                 double         x,
+                 double         y,
+                 gpointer       unused)
+{
+  GtkWidget *picture;
+  GdkPaintable *paintable;
+
+  picture = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (dest));
+  paintable = g_value_get_object (value);
+
+  gtk_picture_set_paintable (GTK_PICTURE (picture), paintable);
+
+  return TRUE;
+}
+
 static void
 info_bar_response (GtkWidget *infobar, int response_id)
 {
@@ -1182,7 +1213,7 @@ populate_flowbox (GtkWidget *flowbox)
   GtkWidget *child;
   int i;
   const char *resources[] = {
-    "sunset.jpg", "snowy.jpg", "portland-rose.jpg"
+    "sunset.jpg", "portland-rose.jpg", "beach.jpg", "nyc.jpg"
   };
 
   if (GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (flowbox), "populated")))
@@ -2040,6 +2071,8 @@ activate (GApplication *app)
           "on_page_combo_changed", (GCallback)on_page_combo_changed,
           "on_range_from_changed", (GCallback)on_range_from_changed,
           "on_range_to_changed", (GCallback)on_range_to_changed,
+          "on_picture_drag_prepare", (GCallback)on_picture_drag_prepare,
+          "on_picture_drop", (GCallback)on_picture_drop,
           "tab_close_cb", (GCallback)tab_close_cb,
           "increase_icon_size", (GCallback)increase_icon_size,
           "decrease_icon_size", (GCallback)decrease_icon_size,

demos/widget-factory/widget-factory.gresource.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
   <gresource prefix="/org/gtk/WidgetFactory4">
-    <file preprocess="xml-stripblanks">widget-factory.ui</file>
+    <file alias='widget-factory.ui'>widget-factory.uic</file>
   </gresource>
   <gresource prefix="/org/gtk/WidgetFactory4">
     <file>widget-factory.css</file>
@@ -115,7 +115,8 @@
   <gresource prefix="/org/gtk/WidgetFactory4">
     <file>gtk-logo.webm</file>
     <file>sunset.jpg</file>
-    <file>snowy.jpg</file>
     <file>portland-rose.jpg</file>
+    <file>nyc.jpg</file>
+    <file>beach.jpg</file>
   </gresource>
 </gresources>

demos/widget-factory/widget-factory.ui

@@ -1051,22 +1051,9 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                             <property name="spacing">10</property>
                             <property name="hexpand">1</property>
                             <child>
-                              <object class="GtkFrame" id="frame1">
-                                <property name="valign">start</property>
-                                <child type="label">
-                                  <object class="GtkLabel" id="label1">
-                                    <property name="label" translatable="yes">&lt;b&gt;Video&lt;/b&gt;</property>
-                                    <property name="use-markup">1</property>
-                                  </object>
-                                </child>
+                              <object class="GtkFrame">
                                 <child>
                                   <object class="GtkVideo">
-                                    <property name="halign">center</property>
-                                    <property name="valign">center</property>
-                                    <property name="margin-start">6</property>
-                                    <property name="margin-end">6</property>
-                                    <property name="margin-top">6</property>
-                                    <property name="margin-bottom">6</property>
                                     <property name="autoplay">1</property>
                                     <property name="loop">1</property>
                                     <property name="file">resource:///org/gtk/WidgetFactory4/gtk-logo.webm</property>
@@ -1075,66 +1062,78 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                               </object>
                             </child>
                             <child>
-                              <object class="GtkScrolledWindow">
-                                <property name="vexpand">1</property>
-                                <property name="hscrollbar-policy">never</property>
-                                <property name="vscrollbar-policy">automatic</property>
+                              <object class="GtkFrame">
+                                <child type="label">
+                                  <object class="GtkLabel" id="label1">
+                                    <property name="label" translatable="yes">&lt;b&gt;Text Styles&lt;/b&gt;</property>
+                                    <property name="use-markup">1</property>
+                                  </object>
+                                </child>
                                 <child>
-                                  <object class="GtkBox">
-                                    <property name="orientation">vertical</property>
-                                    <property name="spacing">10</property>
+                                  <object class="GtkScrolledWindow">
+                                    <property name="vexpand">1</property>
+                                    <property name="hscrollbar-policy">never</property>
+                                    <property name="vscrollbar-policy">automatic</property>
+                                    <property name="propagate-natural-height">1</property>
+                                    <property name="propagate-natural-width">1</property>
                                     <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Large Title</property>
-                                        <style><class name="large-title"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Title 1</property>
-                                        <style><class name="title-1"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Title 2</property>
-                                        <style><class name="title-2"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Title 3</property>
-                                        <style><class name="title-3"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Title 4</property>
-                                        <style><class name="title-4"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Heading</property>
-                                        <style><class name="heading"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Body</property>
-                                        <style><class name="body"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Caption Heading</property>
-                                        <style><class name="caption-heading"/></style>
-                                      </object>
-                                    </child>
-                                    <child>
-                                      <object class="GtkLabel">
-                                        <property name="label">Caption</property>
-                                        <style><class name="caption"/></style>
+                                      <object class="GtkBox">
+                                        <property name="orientation">vertical</property>
+                                        <property name="spacing">10</property>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Large Title</property>
+                                            <style><class name="large-title"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Title 1</property>
+                                            <style><class name="title-1"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Title 2</property>
+                                            <style><class name="title-2"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Title 3</property>
+                                            <style><class name="title-3"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Title 4</property>
+                                            <style><class name="title-4"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Heading</property>
+                                            <style><class name="heading"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Body</property>
+                                            <style><class name="body"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Caption Heading</property>
+                                            <style><class name="caption-heading"/></style>
+                                          </object>
+                                        </child>
+                                        <child>
+                                          <object class="GtkLabel">
+                                            <property name="label">Caption</property>
+                                            <style><class name="caption"/></style>
+                                          </object>
+                                        </child>
                                       </object>
                                     </child>
                                   </object>
@@ -1251,8 +1250,21 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                             <child>
                               <object class="GtkNotebookPage">
                                 <property name="child">
-                                  <object class="GtkBox" id="box6">
-                                    <property name="orientation">vertical</property>
+                                  <object class="GtkPicture">
+                                    <property name="file">resource:///org/gtk/WidgetFactory4/sunset.jpg</property>
+                                    <child>
+                                      <object class="GtkDragSource">
+                                        <property name="actions">copy</property>
+                                        <signal name="prepare" handler="on_picture_drag_prepare" swapped="no"/>
+                                      </object>
+                                    </child>
+                                    <child>
+                                      <object class="GtkDropTarget">
+                                        <property name="actions">copy</property>
+                                        <property name="formats">GdkTexture</property>
+                                        <signal name="drop" handler="on_picture_drop" swapped="no"/>
+                                      </object>
+                                    </child>
                                   </object>
                                 </property>
                                 <property name="tab">
@@ -1265,8 +1277,21 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                             <child>
                               <object class="GtkNotebookPage">
                                 <property name="child">
-                                  <object class="GtkBox" id="box7">
-                                    <property name="orientation">vertical</property>
+                                  <object class="GtkPicture">
+                                    <property name="file">resource:///org/gtk/WidgetFactory4/nyc.jpg</property>
+                                    <child>
+                                      <object class="GtkDragSource">
+                                        <property name="actions">copy</property>
+                                        <signal name="prepare" handler="on_picture_drag_prepare" swapped="no"/>
+                                      </object>
+                                    </child>
+                                    <child>
+                                      <object class="GtkDropTarget">
+                                        <property name="actions">copy</property>
+                                        <property name="formats">GdkTexture</property>
+                                        <signal name="drop" handler="on_picture_drop" swapped="no"/>
+                                      </object>
+                                    </child>
                                   </object>
                                 </property>
                                 <property name="tab">
@@ -1278,10 +1303,22 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                             </child>
                             <child>
                               <object class="GtkNotebookPage">
-                                <property name="position">2</property>
                                 <property name="child">
-                                  <object class="GtkBox" id="box8">
-                                    <property name="orientation">vertical</property>
+                                  <object class="GtkPicture">
+                                    <property name="file">resource:///org/gtk/WidgetFactory4/beach.jpg</property>
+                                    <child>
+                                      <object class="GtkDragSource">
+                                        <property name="actions">copy</property>
+                                        <signal name="prepare" handler="on_picture_drag_prepare" swapped="no"/>
+                                      </object>
+                                    </child>
+                                    <child>
+                                      <object class="GtkDropTarget">
+                                        <property name="actions">copy</property>
+                                        <property name="formats">GdkTexture</property>
+                                        <signal name="drop" handler="on_picture_drop" swapped="no"/>
+                                      </object>
+                                    </child>
                                   </object>
                                 </property>
                                 <property name="tab">
@@ -1299,7 +1336,7 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                             <child>
                               <object class="GtkNotebookPage">
                                 <property name="child">
-                                  <object class="GtkBox" id="box9">
+                                  <object class="GtkBox" id="box8">
                                     <property name="orientation">vertical</property>
                                   </object>
                                 </property>

docs/reference/gdk/gdk4-wayland.toml.in

@@ -13,7 +13,7 @@ devhelp = true
   [dependencies."GObject-2.0"]
   name = "GObject"
   description = "The base type system library"
-  docs_url = "https://developer.gnome.org/gobject/stable"
+  docs_url = "https://docs.gtk.org/gobject/"
 
 [theme]
 name = "basic"

docs/reference/gdk/gdk4-x11.toml.in

@@ -13,7 +13,7 @@ devhelp = true
   [dependencies."GObject-2.0"]
   name = "GObject"
   description = "The base type system library"
-  docs_url = "https://developer.gnome.org/gobject/stable"
+  docs_url = "https://docs.gtk.org/gobject/"
 
 [theme]
 name = "basic"

docs/reference/gdk/gdk4.toml.in

@@ -14,7 +14,7 @@ search_index = true
   [dependencies."GObject-2.0"]
   name = "GObject"
   description = "The base type system library"
-  docs_url = "https://developer.gnome.org/gobject/stable"
+  docs_url = "https://docs.gtk.org/gobject/"
 
   [dependencies."cairo-1.0"]
   name = "Cairo"

docs/reference/gdk/meson.build

@@ -1,11 +1,15 @@
 expand_content_md_files = [
 ]
 
-gdk4_toml = configure_file(input: 'gdk4.toml.in', output: 'gdk4.toml', configuration: toml_conf)
-gdk4x11_toml = configure_file(input: 'gdk4-x11.toml.in', output: 'gdk4-x11.toml', configuration: toml_conf)
-gdk4wayland_toml = configure_file(input: 'gdk4-wayland.toml.in', output: 'gdk4-wayland.toml', configuration: toml_conf)
-
 if get_option('gtk_doc')
+  gdk4_toml = configure_file(
+    input: 'gdk4.toml.in',
+    output: 'gdk4.toml',
+    configuration: toml_conf,
+    install: true,
+    install_dir: docs_dir / 'gdk4',
+  )
+
   custom_target('gdk4-doc',
     input: [ gdk4_toml, gdk_gir[0] ],
     output: 'gdk4',
@@ -28,6 +32,14 @@ if get_option('gtk_doc')
   )
 
   if x11_enabled
+    gdk4x11_toml = configure_file(
+      input: 'gdk4-x11.toml.in',
+      output: 'gdk4-x11.toml',
+      configuration: toml_conf,
+      install: true,
+      install_dir: docs_dir / 'gdk4-x11',
+    )
+
     custom_target('gdk4-x11-doc',
       input: [ gdk4x11_toml, gdk_x11_gir[0] ],
       output: 'gdk4-x11',
@@ -52,6 +64,14 @@ if get_option('gtk_doc')
   endif
 
   if wayland_enabled
+    gdk4wayland_toml = configure_file(
+      input: 'gdk4-wayland.toml.in',
+      output: 'gdk4-wayland.toml',
+      configuration: toml_conf,
+      install: true,
+      install_dir: docs_dir / 'gdk4-wayland',
+    )
+
     custom_target('gdk4-wayland-doc',
       input: [ gdk4wayland_toml, gdk_wayland_gir[0] ],
       output: 'gdk4-wayland',

docs/reference/gdk/urlmap.js

@@ -3,11 +3,14 @@
 
 // A map between namespaces and base URLs for their online documentation
 baseURLs = [
-    [ 'Gdk', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4/' ],
-    [ 'GdkWayland', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4-wayland/' ],
-    [ 'GdkX11', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4-x11/' ],
-    [ 'Gsk', 'https://gnome.pages.gitlab.gnome.org/gtk/gsk4/' ],
-    [ 'Gtk', 'https://gnome.pages.gitlab.gnome.org/gtk/gtk4/' ],
-    [ 'Pango', 'https://gnome.pages/gitlab.gnome.org/pango/pango/' ],
-    [ 'PangoCairo', 'https://gnome.pages.gitlab.gnome.org/pango/pangocairo/' ],
+    [ 'GLib', 'https://docs.gtk.org/glib/' ],
+    [ 'GObject', 'https://docs.gtk.org/gobject/' ],
+    [ 'Gio', 'https://docs.gtk.org/gio/' ],
+    [ 'Gdk', 'https://docs.gtk.org/gdk4/' ],
+    [ 'GdkWayland', 'https://docs.gtk.org/gdk4-wayland/' ],
+    [ 'GdkX11', 'https://docs.gtk.org/gdk4-x11/' ],
+    [ 'Gsk', 'https://docs.gtk.org/gsk4/' ],
+    [ 'Gtk', 'https://docs.gtk.org/gtk4/' ],
+    [ 'Pango', 'https://docs.gtk.org/Pango/' ],
+    [ 'PangoCairo', 'https://docs.gtk.org/PangoCairo/' ],
 ]

docs/reference/gsk/gsk4.toml.in

@@ -14,7 +14,7 @@ search_index = true
   [dependencies."GObject-2.0"]
   name = "GObject"
   description = "The base type system library"
-  docs_url = "https://developer.gnome.org/gobject/stable/"
+  docs_url = "https://docs.gtk.org/gobject/"
 
   [dependencies."Graphene-1.0"]
   name = "Graphene"

docs/reference/gsk/meson.build

@@ -1,6 +1,12 @@
-gsk4_toml = configure_file(input: 'gsk4.toml.in', output: 'gsk4.toml', configuration: toml_conf)
-
 if get_option('gtk_doc')
+  gsk4_toml = configure_file(
+    input: 'gsk4.toml.in',
+    output: 'gsk4.toml',
+    configuration: toml_conf,
+    install: true,
+    install_dir: docs_dir / 'gsk4',
+  )
+
   custom_target('gsk4-doc',
     input: [ gsk4_toml, gsk_gir[0] ],
     output: 'gsk4',

docs/reference/gsk/urlmap.js

@@ -3,11 +3,14 @@
 
 // A map between namespaces and base URLs for their online documentation
 baseURLs = [
-    [ 'Gdk', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4/' ],
-    [ 'GdkWayland', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4-wayland/' ],
-    [ 'GdkX11', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4-x11/' ],
-    [ 'Gsk', 'https://gnome.pages.gitlab.gnome.org/gtk/gsk4/' ],
-    [ 'Gtk', 'https://gnome.pages.gitlab.gnome.org/gtk/gtk4/' ],
-    [ 'Pango', 'https://gnome.pages/gitlab.gnome.org/pango/pango/' ],
-    [ 'PangoCairo', 'https://gnome.pages.gitlab.gnome.org/pango/pangocairo/' ],
+    [ 'GLib', 'https://docs.gtk.org/glib/' ],
+    [ 'GObject', 'https://docs.gtk.org/gobject/' ],
+    [ 'Gio', 'https://docs.gtk.org/gio/' ],
+    [ 'Gdk', 'https://docs.gtk.org/gdk4/' ],
+    [ 'GdkWayland', 'https://docs.gtk.org/gdk4-wayland/' ],
+    [ 'GdkX11', 'https://docs.gtk.org/gdk4-x11/' ],
+    [ 'Gsk', 'https://docs.gtk.org/gsk4/' ],
+    [ 'Gtk', 'https://docs.gtk.org/gtk4/' ],
+    [ 'Pango', 'https://docs.gtk.org/Pango/' ],
+    [ 'PangoCairo', 'https://docs.gtk.org/PangoCairo/' ],
 ]

docs/reference/gtk/css-properties.md

@@ -162,6 +162,8 @@ done with
 |caret-color|[CSS Basic User Interface Level 3](https://www.w3.org/TR/css3-ui/#caret-color) | CSS allows an auto value |
 |-gtk-secondary-caret-color|[Color](https://www.w3.org/TR/css-color-3/#valuea-def-color) | used for the secondary caret in bidirectional text |
 |letter-spacing| [CSS Text Level 3](https://www.w3.org/TR/css3-text/#letter-spacing) | |
+|text-transform| [CSS Text Level 3](https://www.w3.org/TR/css-text-3/#text-transform-property) | CSS allows full-width and full-size-kana. Since 4.6 |
+|line-height| [CSS Inline Layout Level 3](https://www.w3.org/TR/css-inline-3/#line-height-property) | Since 4.6 |
 |text-decoration-line| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-line-property) | |
 |text-decoration-color| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-color-property) | |
 |text-decoration-style| [CSS Text Decoration Level 3](https://www.w3.org/TR/css-text-decor-3/#text-decoration-style-property) | CSS allows dashed and dotted |

docs/reference/gtk/gtk4.toml.in

@@ -14,7 +14,7 @@ search_index = true
   [dependencies."GObject-2.0"]
   name = "GObject"
   description = "The base type system library"
-  docs_url = "https://developer.gnome.org/gobject/stable"
+  docs_url = "https://docs.gtk.org/gobject/"
 
   [dependencies."Graphene-1.0"]
   name = "Graphene"

docs/reference/gtk/input-handling.md

@@ -137,6 +137,14 @@ capture phase, and key bindings locally, during the target phase.
 Under the hood, all shortcuts are represented as instances of `GtkShortcut`,
 and they are managed by `GtkShortcutController`.
 
+## Text input
+
+When actual text input is needed (i.e. not just keyboard shortcuts),
+input method support can be added to a widget by connecting an input
+method context and listening to its `::commit` signal. To create a new
+input method context, use gtk_im_multicontext_new(), to provide it with
+input, use gtk_event_controller_key_set_im_context().
+
 ## Event controllers and gestures
 
 Event controllers are standalone objects that can perform

docs/reference/gtk/meson.build

@@ -27,9 +27,15 @@ expand_content_md_files = [
   'visual_index.md'
 ]
 
-gtk4_toml = configure_file(input: 'gtk4.toml.in', output: 'gtk4.toml', configuration: toml_conf)
-
 if get_option('gtk_doc')
+  gtk4_toml = configure_file(
+    input: 'gtk4.toml.in',
+    output: 'gtk4.toml',
+    configuration: toml_conf,
+    install: true,
+    install_dir: docs_dir / 'gtk4',
+  )
+
   custom_target('gtk4-doc',
     input: [ gtk4_toml, gtk_gir[0] ],
     output: 'gtk4',

docs/reference/gtk/urlmap.js

@@ -3,11 +3,14 @@
 
 // A map between namespaces and base URLs for their online documentation
 baseURLs = [
-    [ 'Gdk', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4/' ],
-    [ 'GdkWayland', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4-wayland/' ],
-    [ 'GdkX11', 'https://gnome.pages.gitlab.gnome.org/gtk/gdk4-x11/' ],
-    [ 'Gsk', 'https://gnome.pages.gitlab.gnome.org/gtk/gsk4/' ],
-    [ 'Gtk', 'https://gnome.pages.gitlab.gnome.org/gtk/gtk4/' ],
-    [ 'Pango', 'https://gnome.pages/gitlab.gnome.org/pango/pango/' ],
-    [ 'PangoCairo', 'https://gnome.pages.gitlab.gnome.org/pango/pangocairo/' ],
+    [ 'GLib', 'https://docs.gtk.org/glib/' ],
+    [ 'GObject', 'https://docs.gtk.org/gobject/' ],
+    [ 'Gio', 'https://docs.gtk.org/gio/' ],
+    [ 'Gdk', 'https://docs.gtk.org/gdk4/' ],
+    [ 'GdkWayland', 'https://docs.gtk.org/gdk4-wayland/' ],
+    [ 'GdkX11', 'https://docs.gtk.org/gdk4-x11/' ],
+    [ 'Gsk', 'https://docs.gtk.org/gsk4/' ],
+    [ 'Gtk', 'https://docs.gtk.org/gtk4/' ],
+    [ 'Pango', 'https://docs.gtk.org/Pango/' ],
+    [ 'PangoCairo', 'https://docs.gtk.org/PangoCairo/' ],
 ]

docs/reference/gtk/windows.md

@@ -14,14 +14,19 @@ instructions, binary downloads, etc, can be found
 The Win32 GDK backend can be influenced with some additional environment
 variables.
 
-### GDK_IGNORE_WINTAB
+### GDK_WIN32_TABLET_INPUT_API
 
-If this variable is set, GTK doesn't use the Wintab API for tablet support.
+If this variable is set, it determines the API that GTK uses for tablet support.
+The possible values are:
 
-### GDK_USE_WINTAB
+`none`
+: Disables tablet support
 
-If this variable is set, GTK uses the Wintab API for tablet support.
-This is the default.
+`wintab`
+: Use the Wintab API
+
+`winpointer`
+: Use the Windows Pointer Input Stack API. This is the default.
 
 ## Windows-specific handling of cursors
 

docs/reference/meson.build

@@ -5,6 +5,10 @@ gidocgen = find_program('gi-docgen', required: get_option('gtk_doc'))
 
 docs_dir = gtk_datadir / 'doc'
 
+if get_option('gtk_doc') and not build_gir
+  error('API reference requires introspection.')
+endif
+
 subdir('gdk')
 subdir('gsk')
 subdir('gtk')

examples/bp/bloatpad.c

@@ -603,8 +603,8 @@ bloat_pad_startup (GApplication *application)
   g_object_unref (icon);
   g_bytes_unref (bytes);
 
-  icon = G_ICON (gdk_pixbuf_new_from_resource ("/org/gtk/libgtk/icons/16x16/actions/folder-new.png", NULL));
-  item = g_menu_item_new ("Pixbuf", NULL);
+  icon = G_ICON (gdk_texture_new_from_resource ("/org/gtk/libgtk/icons/16x16/actions/folder-new.png"));
+  item = g_menu_item_new ("Texture", NULL);
   g_menu_item_set_icon (item, icon);
   g_menu_append_item (menu, item);
   g_object_unref (item);

examples/labels.js

@@ -0,0 +1,50 @@
+#!/usr/bin/env -S GI_TYPELIB_PATH=${PWD}/build/gtk:${GI_TYPELIB_PATH} LD_PRELOAD=${LD_PRELOAD}:${PWD}/build/gtk/libgtk-4.so gjs
+
+imports.gi.versions['Gtk'] = '4.0';
+
+const GObject = imports.gi.GObject;
+const Gtk = imports.gi.Gtk;
+
+const DemoWidget = GObject.registerClass({
+  GTypeName: 'DemoWidget',
+  }, class DemoWidget extends Gtk.Widget {
+
+  _init(params = {}) {
+       super._init(params);
+
+       let layout_manager = new Gtk.GridLayout ();
+       this.set_layout_manager (layout_manager);
+       this.label1 = new Gtk.Label({ label: "Red",
+                                     hexpand: true,
+                                     vexpand: true });
+       this.label1.set_parent (this);
+       let child1 = layout_manager.get_layout_child (this.label1);
+       child1.set_row (0);
+       child1.set_column (0);
+
+       this.label2 = new Gtk.Label({ label: "Green",
+                                     hexpand: true,
+                                     vexpand: true });
+       this.label2.set_parent (this);
+       let child2 = layout_manager.get_layout_child (this.label2);
+       child2.set_row (0);
+       child2.set_column (1);
+    }
+});
+
+// Create a new application
+let app = new Gtk.Application({ application_id: 'org.gtk.exampleapp' });
+
+// When the application is launched…
+app.connect('activate', () => {
+    // … create a new window …
+    let win = new Gtk.ApplicationWindow({ application: app });
+    // … with a button in it …
+    let widget = new DemoWidget();
+    win.set_child(widget);
+    win.present();
+});
+
+// Run the application
+app.run([]);
+

gdk/broadway/gdkdisplay-broadway.c

@@ -33,6 +33,7 @@
 #include "gdkinternals.h"
 #include "gdkdeviceprivate.h"
 #include <gdk/gdktextureprivate.h>
+#include "gdk-private.h"
 
 #include <glib.h>
 #include <glib/gprintf.h>
@@ -463,7 +464,7 @@ gdk_broadway_display_flush_in_idle (GdkDisplay *display)
   if (broadway_display->idle_flush_id == 0)
     {
       broadway_display->idle_flush_id = g_idle_add (flush_idle, g_object_ref (display));
-      g_source_set_name_by_id (broadway_display->idle_flush_id, "[gtk] flush_idle");
+      gdk_source_set_static_name_by_id (broadway_display->idle_flush_id, "[gtk] flush_idle");
     }
 }
 

gdk/gdk-private.h

@@ -29,7 +29,7 @@ gboolean gdk_should_use_portal (void);
 
 const char *   gdk_get_startup_notification_id (void);
 
-PangoDirection gdk_unichar_direction (gunichar    ch);
+PangoDirection gdk_unichar_direction (gunichar    ch) G_GNUC_CONST;
 PangoDirection gdk_find_base_dir     (const char *text,
                                       int         len);
 
@@ -57,4 +57,11 @@ guint gdk_parse_debug_var (const char        *variable,
 # define g_memdup2(mem,size)    g_memdup((mem),(size))
 #endif
 
+void gdk_source_set_static_name_by_id (guint       tag,
+                                       const char *name);
+
+#if !GLIB_CHECK_VERSION(2, 69, 1)
+#define g_source_set_static_name(source, name) g_source_set_name ((source), (name))
+#endif
+
 #endif /* __GDK__PRIVATE_H__ */

gdk/gdk.c

@@ -127,10 +127,12 @@ static const GdkDebugKey gdk_debug_keys[] = {
   { "gl-legacy",       GDK_DEBUG_GL_LEGACY, "Use a legacy OpenGL context" },
   { "gl-gles",         GDK_DEBUG_GL_GLES, "Use a GLES OpenGL context" },
   { "gl-debug",        GDK_DEBUG_GL_DEBUG, "Insert debugging information in OpenGL" },
+  { "gl-egl",          GDK_DEBUG_GL_EGL, "Use EGL on X11 or Windows" },
   { "gl-glx",          GDK_DEBUG_GL_GLX, "Use GLX on X11" },
+  { "gl-wgl",          GDK_DEBUG_GL_WGL, "Use WGL on Windows" },
   { "vulkan-disable",  GDK_DEBUG_VULKAN_DISABLE, "Disable Vulkan support" },
   { "vulkan-validate", GDK_DEBUG_VULKAN_VALIDATE, "Load the Vulkan validation layer" },
-  { "default-settings",GDK_DEBUG_DEFAULT_SETTINGS, "Force default values for xsettings" },
+  { "default-settings",GDK_DEBUG_DEFAULT_SETTINGS, "Force default values for xsettings", TRUE },
 };
 
 
@@ -412,3 +414,17 @@ gdk_find_base_dir (const char *text,
   return dir;
 }
 
+void
+gdk_source_set_static_name_by_id (guint           tag,
+                                  const char     *name)
+{
+  GSource *source;
+
+  g_return_if_fail (tag > 0);
+
+  source = g_main_context_find_source_by_id (NULL, tag);
+  if (source == NULL)
+    return;
+
+  g_source_set_static_name (source, name);
+}

gdk/gdkcairo.h

@@ -50,7 +50,7 @@ cairo_region_t *
            gdk_cairo_region_create_from_surface
                                         (cairo_surface_t      *surface);
 
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_4_6_FOR(gdk_gl_texture_new)
 void       gdk_cairo_draw_from_gl (cairo_t              *cr,
                                    GdkSurface            *surface,
                                    int                   source,

gdk/gdkclipboard.c

@@ -635,7 +635,7 @@ gdk_clipboard_read_internal (GdkClipboard        *clipboard,
 /**
  * gdk_clipboard_read_async:
  * @clipboard: a `GdkClipboard`
- * @mime_types: a %NULL-terminated array of mime types to choose from
+ * @mime_types: (array zero-terminated=1): a %NULL-terminated array of mime types to choose from
  * @io_priority: the I/O priority of the request
  * @cancellable: (nullable): optional `GCancellable` object
  * @callback: (scope async): callback to call when the request is satisfied
@@ -1253,9 +1253,15 @@ gdk_clipboard_set_content (GdkClipboard       *clipboard,
  * @...: value contents conforming to @type
  *
  * Sets the clipboard to contain the value collected from the given varargs.
+ * 
+ * Values should be passed the same way they are passed to other value
+ * collecting APIs, such as [`method@GObject.Object.set`] or
+ * [`id@g_signal_emit`].
  *
  * ```c
- * gdk_clipboard_set (clipboard, GTK_TYPE_TEXT_BUFFER, buffer);
+ * gdk_clipboard_set (clipboard, GTK_TYPE_STRING, "Hello World");
+ * 
+ * gdk_clipboard_set (clipboard, GDK_TYPE_TEXTURE, some_texture);
  * ```
  */
 void

gdk/gdkcontentdeserializer.c

@@ -25,6 +25,8 @@
 #include "filetransferportalprivate.h"
 #include "gdktexture.h"
 #include "gdkrgbaprivate.h"
+#include "loaders/gdkpngprivate.h"
+#include "loaders/gdktiffprivate.h"
 
 #include <gdk-pixbuf/gdk-pixbuf.h>
 
@@ -553,6 +555,8 @@ gdk_content_deserialize_async (GInputStream        *stream,
   Deserializer *deserializer;
 
   g_return_if_fail (G_IS_INPUT_STREAM (stream));
+  g_return_if_fail (mime_type != NULL);
+  g_return_if_fail (G_TYPE_IS_VALUE_TYPE (type));
   g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
   g_return_if_fail (callback != NULL);
 
@@ -591,7 +595,10 @@ gdk_content_deserialize_finish (GAsyncResult  *result,
   g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (result), FALSE);
   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
   deserializer = GDK_CONTENT_DESERIALIZER (result);
-  g_return_val_if_fail (G_VALUE_HOLDS (value, G_VALUE_TYPE (&deserializer->value)), FALSE);
+  if (G_VALUE_TYPE (value) == 0)
+    g_value_init (value, G_VALUE_TYPE (&deserializer->value));
+  else
+    g_return_val_if_fail (G_VALUE_HOLDS (value, G_VALUE_TYPE (&deserializer->value)), FALSE);
 
   if (deserializer->error)
     {
@@ -650,6 +657,56 @@ pixbuf_deserializer (GdkContentDeserializer *deserializer)
                                     deserializer);
 }
 
+static void
+texture_deserializer_finish (GObject      *source,
+                             GAsyncResult *result,
+                             gpointer      deserializer)
+{
+  GOutputStream *stream = G_OUTPUT_STREAM (source);
+  GBytes *bytes;
+  GError *error = NULL;
+  GdkTexture *texture = NULL;
+  gssize written;
+
+  written = g_output_stream_splice_finish (stream, result, &error);
+  if (written < 0)
+    {
+      gdk_content_deserializer_return_error (deserializer, error);
+      return;
+    }
+
+  bytes = g_memory_output_stream_steal_as_bytes (G_MEMORY_OUTPUT_STREAM (stream));
+
+  texture = gdk_texture_new_from_bytes (bytes, &error);
+  g_bytes_unref (bytes);
+  if (texture == NULL)
+    {
+      gdk_content_deserializer_return_error (deserializer, error);
+      return;
+    }
+
+  g_value_take_object (gdk_content_deserializer_get_value (deserializer), texture);
+  gdk_content_deserializer_return_success (deserializer);
+}
+
+static void
+texture_deserializer (GdkContentDeserializer *deserializer)
+{
+  GOutputStream *output;
+
+  output = g_memory_output_stream_new_resizable ();
+
+  g_output_stream_splice_async (output,
+                                gdk_content_deserializer_get_input_stream (deserializer),
+                                G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE
+                                | G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
+                                gdk_content_deserializer_get_priority (deserializer),
+                                gdk_content_deserializer_get_cancellable (deserializer),
+                                texture_deserializer_finish,
+                                deserializer);
+  g_object_unref (output);
+}
+
 static void
 string_deserializer_finish (GObject      *source,
                             GAsyncResult *result,
@@ -858,48 +915,71 @@ init (void)
 
   initialized = TRUE;
 
+  gdk_content_register_deserializer ("image/png",
+                                     GDK_TYPE_TEXTURE,
+                                     texture_deserializer,
+                                     NULL,
+                                     NULL);
+  gdk_content_register_deserializer ("image/tiff",
+                                     GDK_TYPE_TEXTURE,
+                                     texture_deserializer,
+                                     NULL,
+                                     NULL);
+  gdk_content_register_deserializer ("image/jpeg",
+                                     GDK_TYPE_TEXTURE,
+                                     texture_deserializer,
+                                     NULL,
+                                     NULL);
+
+
   formats = gdk_pixbuf_get_formats ();
 
   /* Make sure png comes first */
   for (f = formats; f; f = f->next)
     {
       GdkPixbufFormat *fmt = f->data;
-      char *name; 
- 
+      char *name;
+
       name = gdk_pixbuf_format_get_name (fmt);
       if (g_str_equal (name, "png"))
-	{
-	  formats = g_slist_delete_link (formats, f);
-	  formats = g_slist_prepend (formats, fmt);
+        {
+          formats = g_slist_delete_link (formats, f);
+          formats = g_slist_prepend (formats, fmt);
 
-	  g_free (name);
-
-	  break;
-	}
+          g_free (name);
+          break;
+        }
 
       g_free (name);
-    }  
+    }
 
   for (f = formats; f; f = f->next)
     {
       GdkPixbufFormat *fmt = f->data;
       char **mimes, **m;
+      char *name;
 
+      name = gdk_pixbuf_format_get_name (fmt);
       mimes = gdk_pixbuf_format_get_mime_types (fmt);
       for (m = mimes; *m; m++)
-	{
-          gdk_content_register_deserializer (*m,
-                                             GDK_TYPE_TEXTURE,
-                                             pixbuf_deserializer,
-                                             NULL,
-                                             NULL);
+        {
+          /* Turning pngs, jpegs and tiffs into textures is handled above */
+          if (!g_str_equal (name, "png") &&
+              !g_str_equal (name, "jpeg") &&
+              !g_str_equal (name, "tiff"))
+            gdk_content_register_deserializer (*m,
+                                               GDK_TYPE_TEXTURE,
+                                               pixbuf_deserializer,
+                                               NULL,
+                                               NULL);
           gdk_content_register_deserializer (*m,
                                              GDK_TYPE_PIXBUF,
                                              pixbuf_deserializer,
                                              NULL,
                                              NULL);
-	}
+        }
       g_strfreev (mimes);
+      g_free (name);
     }
 
   g_slist_free (formats);

gdk/gdkcontentformats.c

@@ -179,6 +179,76 @@ gdk_content_formats_new_for_gtype (GType type)
   return gdk_content_formats_new_take (data, 1, NULL, 0);
 }
 
+/**
+ * gdk_content_formats_parse:
+ * @string: the string to parse
+ *
+ * Parses the given @string into `GdkContentFormats` and
+ * returns the formats. 
+ *
+ * Strings printed via [method@Gdk.ContentFormats.to_string]
+ * can be read in again successfully using this function.
+ *
+ * If @string does not describe valid content formats, %NULL
+ * is returned.
+ *
+ * Returns: (nullable): the content formats if @string is valid
+ *
+ * Since: 4.4
+ */
+GdkContentFormats *
+gdk_content_formats_parse (const char *string)
+{
+  GdkContentFormatsBuilder *builder;
+  char **split;
+  gsize i;
+
+  g_return_val_if_fail (string != NULL, NULL);
+
+  split = g_strsplit_set (string, "\t\n\f\r ", -1); /* same as g_ascii_isspace() */
+  builder = gdk_content_formats_builder_new ();
+
+  /* first the GTypes */
+  for (i = 0; split[i] != NULL; i++)
+    {
+      GType type;
+
+      if (split[i][0] == 0)
+        continue;
+
+      type = g_type_from_name (split[i]);
+      if (type != 0)
+        gdk_content_formats_builder_add_gtype (builder, type);
+      else
+        break;
+    }
+
+  /* then the mime types */
+  for (; split[i] != NULL; i++)
+    {
+      const char *mime_type;
+
+      if (split[i][0] == 0)
+        continue;
+
+      mime_type = gdk_intern_mime_type (split[i]);
+      if (mime_type)
+        gdk_content_formats_builder_add_mime_type (builder, mime_type);
+      else
+        break;
+    }
+
+  if (split[i] != NULL)
+    {
+      g_strfreev (split);
+      gdk_content_formats_builder_unref (builder);
+      return NULL;
+    }
+
+  g_strfreev (split);
+  return gdk_content_formats_builder_free_to_formats (builder);
+}
+
 /**
  * gdk_content_formats_ref:
  * @formats:  a `GdkContentFormats`
@@ -227,10 +297,8 @@ gdk_content_formats_unref (GdkContentFormats *formats)
  *
  * Prints the given @formats into a string for human consumption.
  *
- * This is meant for debugging and logging.
- *
- * The form of the representation may change at any time and is
- * not guaranteed to stay identical.
+ * The result of this function can later be parsed with
+ * [func@Gdk.ContentFormats.parse].
  */
 void
 gdk_content_formats_print (GdkContentFormats *formats,
@@ -241,20 +309,18 @@ gdk_content_formats_print (GdkContentFormats *formats,
   g_return_if_fail (formats != NULL);
   g_return_if_fail (string != NULL);
 
-  g_string_append (string, "{ ");
   for (i = 0; i < formats->n_gtypes; i++)
     {
       if (i > 0)
-        g_string_append (string, ", ");
+        g_string_append (string, " ");
       g_string_append (string, g_type_name (formats->gtypes[i]));
     }
   for (i = 0; i < formats->n_mime_types; i++)
     {
       if (i > 0 || formats->n_gtypes > 0)
-        g_string_append (string, ", ");
+        g_string_append (string, " ");
       g_string_append (string, formats->mime_types[i]);
     }
-  g_string_append (string, " }");
 }
 
 /**
@@ -263,6 +329,8 @@ gdk_content_formats_print (GdkContentFormats *formats,
  *
  * Prints the given @formats into a human-readable string.
  *
+ * The resulting string can be parsed with [func@Gdk.ContentFormats.parse].
+ *
  * This is a small wrapper around [method@Gdk.ContentFormats.print]
  * to help when debugging.
  *

gdk/gdkcontentformats.h

@@ -40,6 +40,8 @@ GdkContentFormats *     gdk_content_formats_new                 (const char
                                                                  guint                           n_mime_types);
 GDK_AVAILABLE_IN_ALL
 GdkContentFormats *     gdk_content_formats_new_for_gtype       (GType                           type);
+GDK_AVAILABLE_IN_4_4
+GdkContentFormats *     gdk_content_formats_parse               (const char                     *string);
 GDK_AVAILABLE_IN_ALL
 GdkContentFormats *     gdk_content_formats_ref                 (GdkContentFormats              *formats);
 GDK_AVAILABLE_IN_ALL

gdk/gdkcontentproviderimpl.c

@@ -80,7 +80,7 @@ gdk_content_provider_value_get_value (GdkContentProvider  *provider,
 {
   GdkContentProviderValue *content = GDK_CONTENT_PROVIDER_VALUE (provider);
 
-  if (G_VALUE_HOLDS (value, G_VALUE_TYPE (&content->value)))
+  if (G_VALUE_HOLDS (&content->value, G_VALUE_TYPE (value)))
     {
       g_value_copy (&content->value, value);
       return TRUE;

gdk/gdkcontentserializer.c

@@ -26,6 +26,10 @@
 #include "filetransferportalprivate.h"
 #include "gdktextureprivate.h"
 #include "gdkrgba.h"
+#include "loaders/gdkpngprivate.h"
+#include "loaders/gdktiffprivate.h"
+#include "loaders/gdkjpegprivate.h"
+#include "gdkmemorytextureprivate.h"
 
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <string.h>
@@ -606,6 +610,7 @@ gdk_content_serialize_finish (GAsyncResult  *result,
 
 /*** SERIALIZERS ***/
 
+
 static void
 pixbuf_serializer_finish (GObject      *source,
                           GAsyncResult *res,
@@ -658,6 +663,77 @@ pixbuf_serializer (GdkContentSerializer *serializer)
   g_object_unref (pixbuf);
 }
 
+static void
+texture_serializer_finish (GObject      *source,
+                           GAsyncResult *res,
+                           gpointer      user_data)
+{
+  GdkContentSerializer *serializer = GDK_CONTENT_SERIALIZER (source);
+  GError *error = NULL;
+
+  if (!g_task_propagate_boolean (G_TASK (res), &error))
+    gdk_content_serializer_return_error (serializer, error);
+  else
+    gdk_content_serializer_return_success (serializer);
+}
+
+static void
+serialize_texture_in_thread (GTask        *task,
+                             gpointer      source_object,
+                             gpointer      task_data,
+                             GCancellable *cancellable)
+{
+  GdkContentSerializer *serializer = source_object;
+  const GValue *value;
+  GdkTexture *texture;
+  GBytes *bytes = NULL;
+  GError *error = NULL;
+  gboolean result = FALSE;
+  GInputStream *input;
+  gssize spliced;
+
+  value = gdk_content_serializer_get_value (serializer);
+  texture = g_value_get_object (value);
+
+  if (strcmp (gdk_content_serializer_get_mime_type (serializer), "image/png") == 0)
+    bytes = gdk_save_png (texture);
+  else if (strcmp (gdk_content_serializer_get_mime_type (serializer), "image/tiff") == 0)
+    bytes = gdk_save_tiff (texture);
+  else if (strcmp (gdk_content_serializer_get_mime_type (serializer), "image/jpeg") == 0)
+    bytes = gdk_save_jpeg (texture);
+  else
+    g_assert_not_reached ();
+
+  input = g_memory_input_stream_new_from_bytes (bytes);
+  spliced = g_output_stream_splice (gdk_content_serializer_get_output_stream (serializer),
+                                    input,
+                                    G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE,
+                                    gdk_content_serializer_get_cancellable (serializer),
+                                    &error);
+  g_object_unref (input);
+  g_bytes_unref (bytes);
+
+  result = spliced != -1;
+
+  if (result)
+    g_task_return_boolean (task, result);
+  else
+    g_task_return_error (task, error);
+}
+
+static void
+texture_serializer (GdkContentSerializer *serializer)
+{
+  GTask *task;
+
+  task = g_task_new (serializer,
+                     gdk_content_serializer_get_cancellable (serializer),
+                     texture_serializer_finish,
+                     NULL);
+  g_task_run_in_thread (task, serialize_texture_in_thread);
+  g_object_unref (task);
+}
+
 static void
 string_serializer_finish (GObject      *source,
                           GAsyncResult *result,
@@ -877,51 +953,72 @@ init (void)
 
   initialized = TRUE;
 
+  gdk_content_register_serializer (GDK_TYPE_TEXTURE,
+                                   "image/png",
+                                   texture_serializer,
+                                   NULL, NULL);
+
+  gdk_content_register_serializer (GDK_TYPE_TEXTURE,
+                                   "image/tiff",
+                                   texture_serializer,
+                                   NULL, NULL);
+
+  gdk_content_register_serializer (GDK_TYPE_TEXTURE,
+                                   "image/jpeg",
+                                   texture_serializer,
+                                   NULL, NULL);
+
   formats = gdk_pixbuf_get_formats ();
 
   /* Make sure png comes first */
   for (f = formats; f; f = f->next)
     {
       GdkPixbufFormat *fmt = f->data;
-      char *name; 
- 
+      char *name;
+
       name = gdk_pixbuf_format_get_name (fmt);
       if (g_str_equal (name, "png"))
-	{
-	  formats = g_slist_delete_link (formats, f);
-	  formats = g_slist_prepend (formats, fmt);
+        {
+          formats = g_slist_delete_link (formats, f);
+          formats = g_slist_prepend (formats, fmt);
 
-	  g_free (name);
-
-	  break;
-	}
+          g_free (name);
+          break;
+        }
 
       g_free (name);
-    }  
+    }
 
   for (f = formats; f; f = f->next)
     {
       GdkPixbufFormat *fmt = f->data;
       char **mimes, **m;
+      char *name;
 
       if (!gdk_pixbuf_format_is_writable (fmt))
-	continue;
+        continue;
 
+      name = gdk_pixbuf_format_get_name (fmt);
       mimes = gdk_pixbuf_format_get_mime_types (fmt);
       for (m = mimes; *m; m++)
-	{
-          gdk_content_register_serializer (GDK_TYPE_TEXTURE,
-                                           *m,
-                                           pixbuf_serializer,
-                                           gdk_pixbuf_format_get_name (fmt),
-                                           g_free);
+        {
+          /* Turning textures into pngs, tiffs or jpegs is handled above */
+          if (!g_str_equal (name, "png") &&
+              !g_str_equal (name, "tiff") &&
+              !g_str_equal (name, "jpeg"))
+            gdk_content_register_serializer (GDK_TYPE_TEXTURE,
+                                             *m,
+                                             pixbuf_serializer,
+                                             gdk_pixbuf_format_get_name (fmt),
+                                             g_free);
           gdk_content_register_serializer (GDK_TYPE_PIXBUF,
                                            *m,
                                            pixbuf_serializer,
                                            gdk_pixbuf_format_get_name (fmt),
                                            g_free);
-	}
+        }
       g_strfreev (mimes);
+      g_free (name);
     }
 
   g_slist_free (formats);

gdk/gdkdebug.h

@@ -41,10 +41,12 @@ typedef enum {
   GDK_DEBUG_GL_LEGACY       = 1 << 15,
   GDK_DEBUG_GL_GLES         = 1 << 16,
   GDK_DEBUG_GL_DEBUG        = 1 << 17,
-  GDK_DEBUG_GL_GLX          = 1 << 18,
-  GDK_DEBUG_VULKAN_DISABLE  = 1 << 19,
-  GDK_DEBUG_VULKAN_VALIDATE = 1 << 20,
-  GDK_DEBUG_DEFAULT_SETTINGS= 1 << 21
+  GDK_DEBUG_GL_EGL          = 1 << 18,
+  GDK_DEBUG_GL_GLX          = 1 << 19,
+  GDK_DEBUG_GL_WGL          = 1 << 20,
+  GDK_DEBUG_VULKAN_DISABLE  = 1 << 21,
+  GDK_DEBUG_VULKAN_VALIDATE = 1 << 22,
+  GDK_DEBUG_DEFAULT_SETTINGS= 1 << 23,
 } GdkDebugFlags;
 
 extern guint _gdk_debug_flags;

gdk/gdkdisplay.c

@@ -77,6 +77,23 @@ enum {
   LAST_SIGNAL
 };
 
+typedef struct _GdkDisplayPrivate GdkDisplayPrivate;
+
+struct _GdkDisplayPrivate {
+  /* The base context that all other contexts inherit from.
+   * This context is never exposed to public API and is
+   * allowed to have a %NULL surface.
+   */
+  GdkGLContext *gl_context;
+  GError *gl_error;
+
+  guint rgba : 1;
+  guint composited : 1;
+  guint input_shapes : 1;
+
+  GdkDebugFlags debug_flags;
+};
+
 static void gdk_display_dispose     (GObject         *object);
 static void gdk_display_finalize    (GObject         *object);
 
@@ -85,7 +102,7 @@ static GdkAppLaunchContext *gdk_display_real_get_app_launch_context (GdkDisplay
 
 static guint signals[LAST_SIGNAL] = { 0 };
 
-G_DEFINE_TYPE (GdkDisplay, gdk_display, G_TYPE_OBJECT)
+G_DEFINE_TYPE_WITH_PRIVATE (GdkDisplay, gdk_display, G_TYPE_OBJECT)
 
 static void
 gdk_display_get_property (GObject    *object,
@@ -119,10 +136,14 @@ gdk_display_real_make_default (GdkDisplay *display)
 {
 }
 
-static void
-gdk_display_real_opened (GdkDisplay *display)
+static GdkGLContext *
+gdk_display_default_init_gl (GdkDisplay  *display,
+                             GError     **error)
 {
-  _gdk_display_manager_add_display (gdk_display_manager_get (), display);
+  g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
+                       _("The current backend does not support OpenGL"));
+
+  return NULL;
 }
 
 static GdkSeat *
@@ -134,6 +155,12 @@ gdk_display_real_get_default_seat (GdkDisplay *display)
   return display->seats->data;
 }
 
+static void
+gdk_display_real_opened (GdkDisplay *display)
+{
+  _gdk_display_manager_add_display (gdk_display_manager_get (), display);
+}
+
 static void
 gdk_display_class_init (GdkDisplayClass *class)
 {
@@ -143,10 +170,11 @@ gdk_display_class_init (GdkDisplayClass *class)
   object_class->dispose = gdk_display_dispose;
   object_class->get_property = gdk_display_get_property;
 
-  class->get_app_launch_context = gdk_display_real_get_app_launch_context;
-  class->opened = gdk_display_real_opened;
   class->make_default = gdk_display_real_make_default;
+  class->get_app_launch_context = gdk_display_real_get_app_launch_context;
+  class->init_gl = gdk_display_default_init_gl;
   class->get_default_seat = gdk_display_real_get_default_seat;
+  class->opened = gdk_display_real_opened;
 
   /**
    * GdkDisplay:composited: (attributes org.gtk.Property.get=gdk_display_is_composited)
@@ -294,6 +322,8 @@ free_device_grabs_foreach (gpointer key,
 static void
 gdk_display_init (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   display->double_click_time = 250;
   display->double_click_distance = 5;
 
@@ -304,22 +334,26 @@ gdk_display_init (GdkDisplay *display)
 
   g_queue_init (&display->queued_events);
 
-  display->debug_flags = _gdk_debug_flags;
+  priv->debug_flags = _gdk_debug_flags;
 
-  display->composited = TRUE;
-  display->rgba = TRUE;
-  display->input_shapes = TRUE;
+  priv->composited = TRUE;
+  priv->rgba = TRUE;
+  priv->input_shapes = TRUE;
 }
 
 static void
 gdk_display_dispose (GObject *object)
 {
   GdkDisplay *display = GDK_DISPLAY (object);
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
 
   _gdk_display_manager_remove_display (gdk_display_manager_get (), display);
 
   g_queue_clear (&display->queued_events);
 
+  g_clear_object (&priv->gl_context);
+  g_clear_error (&priv->gl_error);
+
   G_OBJECT_CLASS (gdk_display_parent_class)->dispose (object);
 }
 
@@ -998,21 +1032,25 @@ gdk_display_get_primary_clipboard (GdkDisplay *display)
 gboolean
 gdk_display_supports_input_shapes (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
 
-  return display->input_shapes;
+  return priv->input_shapes;
 }
 
 void
 gdk_display_set_input_shapes (GdkDisplay *display,
                               gboolean    input_shapes)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_if_fail (GDK_IS_DISPLAY (display));
 
-  if (display->input_shapes == input_shapes)
+  if (priv->input_shapes == input_shapes)
     return;
 
-  display->input_shapes = input_shapes;
+  priv->input_shapes = input_shapes;
 
   g_object_notify_by_pspec (G_OBJECT (display), props[PROP_INPUT_SHAPES]);
 }
@@ -1157,32 +1195,136 @@ gdk_display_get_keymap (GdkDisplay *display)
   return GDK_DISPLAY_GET_CLASS (display)->get_keymap (display);
 }
 
-/*< private >
- * gdk_display_make_gl_context_current:
- * @display: a `GdkDisplay`
- * @context: (optional): a `GdkGLContext`
- *
- * Makes the given @context the current GL context, or unsets
- * the current GL context if @context is %NULL.
- */
-gboolean
-gdk_display_make_gl_context_current (GdkDisplay   *display,
-                                     GdkGLContext *context)
+static void
+gdk_display_init_gl (GdkDisplay *self)
 {
-  return GDK_DISPLAY_GET_CLASS (display)->make_gl_context_current (display, context);
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (self);
+  GdkGLContext *context;
+  gint64 before G_GNUC_UNUSED;
+  gint64 before2 G_GNUC_UNUSED;
+
+  before = GDK_PROFILER_CURRENT_TIME;
+
+  if (GDK_DISPLAY_DEBUG_CHECK (self, GL_DISABLE))
+    {
+      g_set_error_literal (&priv->gl_error, GDK_GL_ERROR,
+                           GDK_GL_ERROR_NOT_AVAILABLE,
+                           _("GL support disabled via GDK_DEBUG"));
+      return;
+    }
+
+  context = GDK_DISPLAY_GET_CLASS (self)->init_gl (self, &priv->gl_error);
+  if (context == NULL)
+    return;
+
+  before2 = GDK_PROFILER_CURRENT_TIME;
+
+  if (!gdk_gl_context_realize (context, &priv->gl_error))
+    {
+      g_object_unref (context);
+      return;
+    }
+
+  gdk_profiler_end_mark (before2, "realize OpenGL context", NULL);
+
+  /* Only assign after realize, so GdkGLContext::realize() can use
+   * gdk_display_get_gl_context() == NULL to differentiate between
+   * the display's context and any other context.
+   */
+  priv->gl_context = context;
+
+  gdk_profiler_end_mark (before, "initialize OpenGL", NULL);
+}
+
+/**
+ * gdk_display_prepare_gl:
+ * @self: a `GdkDisplay`
+ * @error: return location for a `GError`
+ *
+ * Checks that OpenGL is available for @self and ensures that it is
+ * properly initialized.
+ * When this fails, an @error will be set describing the error and this
+ * function returns %FALSE.
+ *
+ * Note that even if this function succeeds, creating a `GdkGLContext`
+ * may still fail.
+ *
+ * This function is idempotent. Calling it multiple times will just 
+ * return the same value or error.
+ *
+ * You never need to call this function, GDK will call it automatically
+ * as needed. But you can use it as a check when setting up code that
+ * might make use of OpenGL.
+ *
+ * Returns: %TRUE if the display supports OpenGL
+ *
+ * Since: 4.4
+ **/
+gboolean
+gdk_display_prepare_gl (GdkDisplay  *self,
+                        GError     **error)
+{
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (self);
+
+  g_return_val_if_fail (GDK_IS_DISPLAY (self), FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  for (;;)
+    {
+      if (priv->gl_context)
+        return TRUE;
+
+      if (priv->gl_error != NULL)
+        {
+          if (error)
+            *error = g_error_copy (priv->gl_error);
+
+
+          return FALSE;
+        }
+
+      gdk_display_init_gl (self);
+
+      /* try again */
+    }
+}
+
+/*< private >
+ * gdk_display_get_gl_context:
+ * @self: the `GdkDisplay`
+ *
+ * Gets the GL context returned from [vfunc@Gdk.Display.init_gl]
+ * previously.
+ *
+ * If that function has not been called yet or did fail, %NULL is
+ * returned.
+ * Call [method@Gdk.Display.prepare_gl] to avoid this.
+ *
+ * Returns: The `GdkGLContext`
+ */
+GdkGLContext *
+gdk_display_get_gl_context (GdkDisplay *self)
+{
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (self);
+
+  return priv->gl_context;
 }
 
 GdkDebugFlags
 gdk_display_get_debug_flags (GdkDisplay *display)
 {
-  return display ? display->debug_flags : _gdk_debug_flags;
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
+  return display ? priv->debug_flags : _gdk_debug_flags;
 }
 
 void
 gdk_display_set_debug_flags (GdkDisplay    *display,
                              GdkDebugFlags  flags)
 {
-  display->debug_flags = flags;
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
+  priv->debug_flags = flags;
 }
 
 /**
@@ -1207,21 +1349,25 @@ gdk_display_set_debug_flags (GdkDisplay    *display,
 gboolean
 gdk_display_is_composited (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
 
-  return display->composited;
+  return priv->composited;
 }
 
 void
 gdk_display_set_composited (GdkDisplay *display,
                             gboolean    composited)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_if_fail (GDK_IS_DISPLAY (display));
 
-  if (display->composited == composited)
+  if (priv->composited == composited)
     return;
 
-  display->composited = composited;
+  priv->composited = composited;
 
   g_object_notify_by_pspec (G_OBJECT (display), props[PROP_COMPOSITED]);
 }
@@ -1248,21 +1394,25 @@ gdk_display_set_composited (GdkDisplay *display,
 gboolean
 gdk_display_is_rgba (GdkDisplay *display)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
 
-  return display->rgba;
+  return priv->rgba;
 }
 
 void
 gdk_display_set_rgba (GdkDisplay *display,
                       gboolean    rgba)
 {
+  GdkDisplayPrivate *priv = gdk_display_get_instance_private (display);
+
   g_return_if_fail (GDK_IS_DISPLAY (display));
 
-  if (display->rgba == rgba)
+  if (priv->rgba == rgba)
     return;
 
-  display->rgba = rgba;
+  priv->rgba = rgba;
 
   g_object_notify_by_pspec (G_OBJECT (display), props[PROP_RGBA]);
 }

gdk/gdkdisplay.h

@@ -68,6 +68,10 @@ gboolean    gdk_display_is_rgba            (GdkDisplay  *display);
 GDK_AVAILABLE_IN_ALL
 gboolean    gdk_display_supports_input_shapes (GdkDisplay    *display);
 
+GDK_AVAILABLE_IN_4_4
+gboolean    gdk_display_prepare_gl         (GdkDisplay  *self,
+                                            GError     **error);
+
 GDK_AVAILABLE_IN_ALL
 GdkDisplay *gdk_display_get_default (void);
 

gdk/gdkdisplayprivate.h

@@ -102,11 +102,6 @@ struct _GdkDisplay
 
   guint vulkan_refcount;
 #endif /* GDK_RENDERING_VULKAN */
-  guint rgba : 1;
-  guint composited : 1;
-  guint input_shapes : 1;
-
-  GdkDebugFlags debug_flags;
 
   GList *seats;
 };
@@ -145,8 +140,8 @@ struct _GdkDisplayClass
 
   GdkKeymap *                (*get_keymap)         (GdkDisplay    *display);
 
-  gboolean               (*make_gl_context_current)    (GdkDisplay        *display,
-                                                        GdkGLContext      *context);
+  GdkGLContext *         (*init_gl)                    (GdkDisplay        *display,
+                                                        GError           **error);
 
   GdkSeat *              (*get_default_seat)           (GdkDisplay     *display);
 
@@ -211,8 +206,7 @@ GdkSurface *        gdk_display_create_surface        (GdkDisplay       *display
                                                        int               width,
                                                        int               height);
 
-gboolean            gdk_display_make_gl_context_current  (GdkDisplay        *display,
-                                                          GdkGLContext      *context);
+GdkGLContext *      gdk_display_get_gl_context        (GdkDisplay       *display);
 
 void                gdk_display_set_rgba              (GdkDisplay       *display,
                                                        gboolean          rgba);

gdk/gdkdrag.h

@@ -69,7 +69,7 @@ GDK_AVAILABLE_IN_ALL
 GdkDragAction    gdk_drag_get_selected_action  (GdkDrag *drag);
 
 GDK_AVAILABLE_IN_ALL
-gboolean         gdk_drag_action_is_unique     (GdkDragAction   action);
+gboolean         gdk_drag_action_is_unique     (GdkDragAction   action) G_GNUC_CONST;
 
 GDK_AVAILABLE_IN_ALL
 GdkDrag *        gdk_drag_begin                (GdkSurface         *surface,

gdk/gdkdrawcontext.c

@@ -43,6 +43,7 @@
 typedef struct _GdkDrawContextPrivate GdkDrawContextPrivate;
 
 struct _GdkDrawContextPrivate {
+  GdkDisplay *display;
   GdkSurface *surface;
 
   cairo_region_t *frame_region;
@@ -77,6 +78,7 @@ gdk_draw_context_dispose (GObject *gobject)
       priv->surface->draw_contexts = g_slist_remove (priv->surface->draw_contexts, context);
       g_clear_object (&priv->surface);
     }
+  g_clear_object (&priv->display);
 
   G_OBJECT_CLASS (gdk_draw_context_parent_class)->dispose (gobject);
 }
@@ -92,10 +94,31 @@ gdk_draw_context_set_property (GObject      *gobject,
 
   switch (prop_id)
     {
+    case PROP_DISPLAY:
+      if (priv->display != NULL)
+        {
+          g_assert (g_value_get_object (value) == NULL);
+        }
+      else
+        {
+          priv->display = g_value_dup_object (value);
+        }
+      break;
+
     case PROP_SURFACE:
       priv->surface = g_value_dup_object (value);
-      g_assert (priv->surface != NULL);
-      priv->surface->draw_contexts = g_slist_prepend (priv->surface->draw_contexts, context);
+      if (priv->surface)
+        {
+          priv->surface->draw_contexts = g_slist_prepend (priv->surface->draw_contexts, context);
+          if (priv->display)
+            {
+              g_assert (priv->display == gdk_surface_get_display (priv->surface));
+            }
+          else
+            {
+              priv->display = g_object_ref (gdk_surface_get_display (priv->surface));
+            }
+        }
       break;
 
     default:
@@ -148,7 +171,8 @@ gdk_draw_context_class_init (GdkDrawContextClass *klass)
                          P_("Display"),
                          P_("The GDK display used to create the context"),
                          GDK_TYPE_DISPLAY,
-                         G_PARAM_READABLE |
+                         G_PARAM_READWRITE |
+                         G_PARAM_CONSTRUCT_ONLY |
                          G_PARAM_STATIC_STRINGS);
 
   /**
@@ -228,7 +252,7 @@ gdk_draw_context_get_display (GdkDrawContext *context)
 
   g_return_val_if_fail (GDK_IS_DRAW_CONTEXT (context), NULL);
 
-  return priv->surface ? gdk_surface_get_display (priv->surface) : NULL;
+  return priv->display;
 }
 
 /**

gdk/gdkframeclockidle.c

@@ -29,6 +29,7 @@
 #include "gdkinternals.h"
 #include "gdkframeclockprivate.h"
 #include "gdk.h"
+#include "gdk-private.h"
 #include "gdkprofilerprivate.h"
 
 #ifdef G_OS_WIN32
@@ -307,12 +308,15 @@ maybe_start_idle (GdkFrameClockIdle *clock_idle,
 
       if (priv->flush_idle_id == 0 && RUN_FLUSH_IDLE (priv))
         {
+          GSource *source;
+
           priv->flush_idle_id = g_timeout_add_full (GDK_PRIORITY_EVENTS + 1,
                                                     min_interval,
                                                     gdk_frame_clock_flush_idle,
                                                     g_object_ref (clock_idle),
                                                     (GDestroyNotify) g_object_unref);
-          g_source_set_name_by_id (priv->flush_idle_id, "[gtk] gdk_frame_clock_flush_idle");
+          source = g_main_context_find_source_by_id (NULL, priv->flush_idle_id);
+          g_source_set_static_name (source, "[gtk] gdk_frame_clock_flush_idle");
         }
 
       if (!priv->in_paint_idle &&
@@ -324,7 +328,7 @@ maybe_start_idle (GdkFrameClockIdle *clock_idle,
                                                     gdk_frame_clock_paint_idle,
                                                     g_object_ref (clock_idle),
                                                     (GDestroyNotify) g_object_unref);
-          g_source_set_name_by_id (priv->paint_idle_id, "[gtk] gdk_frame_clock_paint_idle");
+          gdk_source_set_static_name_by_id (priv->paint_idle_id, "[gtk] gdk_frame_clock_paint_idle");
         }
     }
 }

gdk/gdkgl.c

@@ -301,7 +301,7 @@ gdk_gl_texture_quads (GdkGLContext *paint_context,
  * @width: The width of the region to draw
  * @height: The height of the region to draw
  *
- * The main way to draw GL content in GTK.
+ * The main way to not draw GL content in GTK.
  *
  * It takes a render buffer ID (@source_type == GL_RENDERBUFFER) or a texture
  * id (@source_type == GL_TEXTURE) and draws it onto @cr with an OVER operation,
@@ -319,6 +319,12 @@ gdk_gl_texture_quads (GdkGLContext *paint_context,
  * with alpha components, so make sure you use GL_TEXTURE if using alpha.
  *
  * Calling this may change the current GL context.
+ *
+ * Deprecated: 4.6: The function is overly complex and produces broken output
+ *   in various combinations of arguments. If you want to draw with GL textures
+ *   in GTK, use [ctor@Gdk.GLTexture.new]; if you want to use that texture in
+ *   Cairo, use [method@Gdk.Texture.download] to download the data into a Cairo
+ *   image surface.
  */
 void
 gdk_cairo_draw_from_gl (cairo_t              *cr,

gdk/gdkglcontext.c

@@ -89,8 +89,6 @@
 #include <epoxy/gl.h>
 
 typedef struct {
-  GdkGLContext *shared_context;
-
   int major;
   int minor;
   int gl_version;
@@ -127,7 +125,28 @@ G_DEFINE_QUARK (gdk-gl-error-quark, gdk_gl_error)
 
 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkGLContext, gdk_gl_context, GDK_TYPE_DRAW_CONTEXT)
 
-static GPrivate thread_current_context = G_PRIVATE_INIT (g_object_unref);
+typedef struct _MaskedContext MaskedContext;
+
+static inline MaskedContext *
+mask_context (GdkGLContext *context,
+              gboolean      surfaceless)
+{
+  return (MaskedContext *) GSIZE_TO_POINTER (GPOINTER_TO_SIZE (context) | (surfaceless ? 1 : 0));
+}
+
+static inline GdkGLContext *
+unmask_context (MaskedContext *mask)
+{
+  return GDK_GL_CONTEXT (GSIZE_TO_POINTER (GPOINTER_TO_SIZE (mask) & ~(gsize) 1));
+}
+
+static void
+unref_unmasked (gpointer data)
+{
+  g_object_unref (unmask_context (data));
+}
+
+static GPrivate thread_current_context = G_PRIVATE_INIT (unref_unmasked);
 
 static void
 gdk_gl_context_clear_old_updated_area (GdkGLContext *context)
@@ -144,17 +163,14 @@ static void
 gdk_gl_context_dispose (GObject *gobject)
 {
   GdkGLContext *context = GDK_GL_CONTEXT (gobject);
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-  GdkGLContext *current;
+  MaskedContext *current;
 
   gdk_gl_context_clear_old_updated_area (context);
 
   current = g_private_get (&thread_current_context);
-  if (current == context)
+  if (unmask_context (current) == context)
     g_private_replace (&thread_current_context, NULL);
 
-  g_clear_object (&priv->shared_context);
-
   G_OBJECT_CLASS (gdk_gl_context_parent_class)->dispose (gobject);
 }
 
@@ -174,17 +190,10 @@ gdk_gl_context_set_property (GObject      *gobject,
                              const GValue *value,
                              GParamSpec   *pspec)
 {
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
-
   switch (prop_id)
     {
     case PROP_SHARED_CONTEXT:
-      {
-        GdkGLContext *context = g_value_get_object (value);
-
-        if (context != NULL)
-          priv->shared_context = g_object_ref (context);
-      }
+      g_assert (g_value_get_object (value) == NULL);
       break;
 
     default:
@@ -198,12 +207,10 @@ gdk_gl_context_get_property (GObject    *gobject,
                              GValue     *value,
                              GParamSpec *pspec)
 {
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private ((GdkGLContext *) gobject);
-
   switch (prop_id)
     {
     case PROP_SHARED_CONTEXT:
-      g_value_set_object (value, priv->shared_context);
+      g_value_set_object (value, NULL);
       break;
 
     default:
@@ -222,64 +229,83 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
 {
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
   guchar *copy = NULL;
-  guint gl_format;
-  guint gl_type;
-  guint bpp;
+  GLint gl_internalformat;
+  GLint gl_format;
+  GLint gl_type;
+  gsize bpp;
 
   g_return_if_fail (GDK_IS_GL_CONTEXT (context));
 
-  if (priv->use_es)
+  if (!priv->use_es && data_format == GDK_MEMORY_DEFAULT) /* Cairo surface format */
     {
-      /* GLES only supports rgba, so convert if necessary */
-      if (data_format != GDK_MEMORY_R8G8B8A8_PREMULTIPLIED)
-        {
-          copy = g_malloc (width * height * 4);
-          gdk_memory_convert (copy, width * 4,
-                              GDK_MEMORY_R8G8B8A8_PREMULTIPLIED,
-                              data, stride, data_format,
-                              width, height);
-          stride = width * 4;
-          data = copy;
-        }
-
-      bpp = 4;
+      gl_internalformat = GL_RGBA8;
+      gl_format = GL_BGRA;
+      gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+    }
+  else if (data_format == GDK_MEMORY_R8G8B8) /* Pixmap non-alpha data */
+    {
+      gl_internalformat = GL_RGBA8;
+      gl_format = GL_RGB;
+      gl_type = GL_UNSIGNED_BYTE;
+    }
+  else if (priv->use_es && data_format == GDK_MEMORY_B8G8R8)
+    {
+      gl_internalformat = GL_RGBA8;
+      gl_format = GL_BGR;
+      gl_type = GL_UNSIGNED_BYTE;
+    }
+  else if (data_format == GDK_MEMORY_R16G16B16)
+    {
+      gl_internalformat = GL_RGBA16;
+      gl_format = GL_RGB;
+      gl_type = GL_UNSIGNED_SHORT;
+    }
+  else if (data_format == GDK_MEMORY_R16G16B16A16_PREMULTIPLIED)
+    {
+      gl_internalformat = GL_RGBA16;
+      gl_format = GL_RGBA;
+      gl_type = GL_UNSIGNED_SHORT;
+    }
+  else if (data_format == GDK_MEMORY_R16G16B16_FLOAT)
+    {
+      gl_internalformat = GL_RGB16F;
+      gl_format = GL_RGB;
+      gl_type = GL_HALF_FLOAT;
+    }
+  else if (data_format == GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED)
+    {
+      gl_internalformat = GL_RGBA16F;
+      gl_format = GL_RGBA;
+      gl_type = GL_HALF_FLOAT;
+    }
+  else if (data_format == GDK_MEMORY_R32G32B32_FLOAT)
+    {
+      gl_internalformat = GL_RGB32F;
+      gl_format = GL_RGB;
+      gl_type = GL_FLOAT;
+    }
+  else if (data_format == GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED)
+    {
+      gl_internalformat = GL_RGBA32F;
+      gl_format = GL_RGBA;
+      gl_type = GL_FLOAT;
+    }
+  else /* Fall-back, convert to GLES format */
+    {
+      copy = g_malloc (width * height * 4);
+      gdk_memory_convert (copy, width * 4,
+                          GDK_MEMORY_CONVERT_GLES_RGBA,
+                          data, stride, data_format,
+                          width, height);
+      data_format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
+      stride = width * 4;
+      data = copy;
+      gl_internalformat = GL_RGBA8;
       gl_format = GL_RGBA;
       gl_type = GL_UNSIGNED_BYTE;
     }
-  else
-    {
-      if (data_format == GDK_MEMORY_DEFAULT) /* Cairo surface format */
-        {
-          gl_format = GL_BGRA;
-          gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
-          bpp = 4;
-        }
-      else if (data_format == GDK_MEMORY_R8G8B8) /* Pixmap non-alpha data */
-        {
-          gl_format = GL_RGB;
-          gl_type = GL_UNSIGNED_BYTE;
-          bpp = 3;
-        }
-      else if (data_format == GDK_MEMORY_B8G8R8)
-        {
-          gl_format = GL_BGR;
-          gl_type = GL_UNSIGNED_BYTE;
-          bpp = 3;
-        }
-      else /* Fall-back, convert to cairo-surface-format */
-        {
-          copy = g_malloc (width * height * 4);
-          gdk_memory_convert (copy, width * 4,
-                              GDK_MEMORY_DEFAULT,
-                              data, stride, data_format,
-                              width, height);
-          stride = width * 4;
-          bpp = 4;
-          data = copy;
-          gl_format = GL_BGRA;
-          gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
-        }
-    }
+
+  bpp = gdk_memory_format_bytes_per_pixel (data_format);
 
   /* GL_UNPACK_ROW_LENGTH is available on desktop GL, OpenGL ES >= 3.0, or if
    * the GL_EXT_unpack_subimage extension for OpenGL ES 2.0 is available
@@ -288,7 +314,7 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
     {
       glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
 
-      glTexImage2D (texture_target, 0, GL_RGBA, width, height, 0, gl_format, gl_type, data);
+      glTexImage2D (texture_target, 0, gl_internalformat, width, height, 0, gl_format, gl_type, data);
       glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
     }
   else if ((!priv->use_es ||
@@ -296,14 +322,14 @@ gdk_gl_context_upload_texture (GdkGLContext    *context,
     {
       glPixelStorei (GL_UNPACK_ROW_LENGTH, stride / bpp);
 
-      glTexImage2D (texture_target, 0, GL_RGBA, width, height, 0, gl_format, gl_type, data);
+      glTexImage2D (texture_target, 0, gl_internalformat, width, height, 0, gl_format, gl_type, data);
 
       glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
     }
   else
     {
       int i;
-      glTexImage2D (texture_target, 0, GL_RGBA, width, height, 0, gl_format, gl_type, NULL);
+      glTexImage2D (texture_target, 0, gl_internalformat, width, height, 0, gl_format, gl_type, NULL);
       for (i = 0; i < height; i++)
         glTexSubImage2D (texture_target, 0, 0, i, width, 1, gl_format, gl_type, data + (i * stride));
     }
@@ -333,23 +359,27 @@ gdk_gl_context_real_get_damage (GdkGLContext *context)
                                         });
 }
 
+static gboolean
+gdk_gl_context_real_is_shared (GdkGLContext *self,
+                               GdkGLContext *other)
+{
+  if (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (self)) != gdk_draw_context_get_display (GDK_DRAW_CONTEXT (other)))
+    return FALSE;
+
+  /* XXX: Should we check es or legacy here? */
+
+  return TRUE;
+}
+
 static void
 gdk_gl_context_real_begin_frame (GdkDrawContext *draw_context,
                                  cairo_region_t *region)
 {
   GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
   GdkSurface *surface;
-  GdkGLContext *shared;
   cairo_region_t *damage;
   int ww, wh;
 
-  shared = gdk_gl_context_get_shared_context (context);
-  if (shared)
-    {
-      GDK_DRAW_CONTEXT_GET_CLASS (GDK_DRAW_CONTEXT (shared))->begin_frame (GDK_DRAW_CONTEXT (shared), region);
-      return;
-    }
-
   damage = GDK_GL_CONTEXT_GET_CLASS (context)->get_damage (context);
 
   if (context->old_updated_area[1])
@@ -379,15 +409,6 @@ static void
 gdk_gl_context_real_end_frame (GdkDrawContext *draw_context,
                                cairo_region_t *painted)
 {
-  GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
-  GdkGLContext *shared;
-
-  shared = gdk_gl_context_get_shared_context (context);
-  if (shared)
-    {
-      GDK_DRAW_CONTEXT_GET_CLASS (GDK_DRAW_CONTEXT (shared))->end_frame (GDK_DRAW_CONTEXT (shared), painted);
-      return;
-    }
 }
 
 static void
@@ -406,6 +427,7 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
 
   klass->realize = gdk_gl_context_real_realize;
   klass->get_damage = gdk_gl_context_real_get_damage;
+  klass->is_shared = gdk_gl_context_real_is_shared;
 
   draw_context_class->begin_frame = gdk_gl_context_real_begin_frame;
   draw_context_class->end_frame = gdk_gl_context_real_end_frame;
@@ -414,7 +436,13 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
   /**
    * GdkGLContext:shared-context: (attributes org.gtk.Property.get=gdk_gl_context_get_shared_context)
    *
-   * The `GdkGLContext` that this context is sharing data with, or %NULL
+   * Always %NULL
+   *
+   * As many contexts can share data now and no single shared context exists
+   * anymore, this function has been deprecated and now always returns %NULL.
+   *
+   * Deprecated: 4.4: Use [method@Gdk.GLContext.is_shared] to check if contexts
+   *   can be shared.
    */
   obj_pspecs[PROP_SHARED_CONTEXT] =
     g_param_spec_object ("shared-context",
@@ -423,7 +451,8 @@ gdk_gl_context_class_init (GdkGLContextClass *klass)
                          GDK_TYPE_GL_CONTEXT,
                          G_PARAM_READWRITE |
                          G_PARAM_CONSTRUCT_ONLY |
-                         G_PARAM_STATIC_STRINGS);
+                         G_PARAM_STATIC_STRINGS |
+                         G_PARAM_DEPRECATED);
 
   gobject_class->set_property = gdk_gl_context_set_property;
   gobject_class->get_property = gdk_gl_context_get_property;
@@ -441,6 +470,21 @@ gdk_gl_context_init (GdkGLContext *self)
   priv->use_es = -1;
 }
 
+/* Must have called gdk_display_prepare_gl() before */
+GdkGLContext *
+gdk_gl_context_new_for_surface (GdkSurface *surface)
+{
+  GdkDisplay *display = gdk_surface_get_display (surface);
+  GdkGLContext *shared = gdk_display_get_gl_context (display);
+
+  /* assert gdk_display_prepare_gl() had been called */
+  g_assert (shared);
+
+  return g_object_new (G_OBJECT_TYPE (shared),
+                       "surface", surface,
+                       NULL);
+}
+
 GdkGLContextPaintData *
 gdk_gl_context_get_paint_data (GdkGLContext *context)
 {
@@ -812,6 +856,44 @@ gdk_gl_context_set_is_legacy (GdkGLContext *context,
   priv->is_legacy = !!is_legacy;
 }
 
+/**
+ * gdk_gl_context_is_shared:
+ * @self: a `GdkGLContext`
+ * @other: the `GdkGLContext` that should be compatible with @self
+ *
+ * Checks if the two GL contexts can share resources.
+ *
+ * When they can, the texture IDs from @other can be used in @self. This
+ * is particularly useful when passing `GdkGLTexture` objects between
+ * different contexts.
+ *
+ * Contexts created for the same display with the same properties will
+ * always be compatible, even if they are created for different surfaces.
+ * For other contexts it depends on the GL backend.
+ *
+ * Both contexts must be realized for this check to succeed. If either one
+ * is not, this function will return %FALSE.
+ *
+ * Returns: %TRUE if the two GL contexts are compatible.
+ *
+ * Since: 4.4
+ */
+gboolean
+gdk_gl_context_is_shared (GdkGLContext *self,
+                          GdkGLContext *other)
+{
+  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (self);
+  GdkGLContextPrivate *priv_other = gdk_gl_context_get_instance_private (other);
+
+  g_return_val_if_fail (GDK_IS_GL_CONTEXT (self), FALSE);
+  g_return_val_if_fail (GDK_IS_GL_CONTEXT (other), FALSE);
+
+  if (!priv->realized || !priv_other->realized)
+    return FALSE;
+
+  return GDK_GL_CONTEXT_GET_CLASS (self)->is_shared (self, other);
+}
+
 /**
  * gdk_gl_context_set_use_es:
  * @context: a `GdkGLContext`
@@ -1092,12 +1174,16 @@ void
 gdk_gl_context_make_current (GdkGLContext *context)
 {
   GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-  GdkGLContext *current;
+  MaskedContext *current, *masked_context;
+  gboolean surfaceless;
 
   g_return_if_fail (GDK_IS_GL_CONTEXT (context));
 
+  surfaceless = !gdk_draw_context_is_in_frame (GDK_DRAW_CONTEXT (context));
+  masked_context = mask_context (context, surfaceless);
+
   current = g_private_get (&thread_current_context);
-  if (current == context)
+  if (current == masked_context)
     return;
 
   /* we need to realize the GdkGLContext if it wasn't explicitly realized */
@@ -1114,11 +1200,15 @@ gdk_gl_context_make_current (GdkGLContext *context)
         }
     }
 
-  if (gdk_display_make_gl_context_current (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context)), context))
+  if (!GDK_GL_CONTEXT_GET_CLASS (context)->make_current (context, surfaceless))
     {
-      g_private_replace (&thread_current_context, g_object_ref (context));
-      gdk_gl_context_check_extensions (context);
+      g_warning ("gdk_gl_context_make_current() failed");
+      return;
     }
+
+  g_object_ref (context);
+  g_private_replace (&thread_current_context, masked_context);
+  gdk_gl_context_check_extensions (context);
 }
 
 /**
@@ -1157,18 +1247,22 @@ gdk_gl_context_get_surface (GdkGLContext *context)
  * gdk_gl_context_get_shared_context: (attributes org.gtk.Method.get_property=shared-context)
  * @context: a `GdkGLContext`
  *
- * Retrieves the `GdkGLContext` that this @context share data with.
+ * Used to retrieves the `GdkGLContext` that this @context share data with.
  *
- * Returns: (nullable) (transfer none): a `GdkGLContext`
+ * As many contexts can share data now and no single shared context exists
+ * anymore, this function has been deprecated and now always returns %NULL.
+ *
+ * Returns: (nullable) (transfer none): %NULL
+ *
+ * Deprecated: 4.4: Use [method@Gdk.GLContext.is_shared] to check if contexts
+ *   can be shared.
  */
 GdkGLContext *
 gdk_gl_context_get_shared_context (GdkGLContext *context)
 {
-  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
-
   g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
 
-  return priv->shared_context;
+  return NULL;
 }
 
 /**
@@ -1208,12 +1302,14 @@ gdk_gl_context_get_version (GdkGLContext *context,
 void
 gdk_gl_context_clear_current (void)
 {
-  GdkGLContext *current;
+  MaskedContext *current;
 
   current = g_private_get (&thread_current_context);
   if (current != NULL)
     {
-      if (gdk_display_make_gl_context_current (gdk_draw_context_get_display (GDK_DRAW_CONTEXT (current)), NULL))
+      GdkGLContext *context = unmask_context (current);
+
+      if (GDK_GL_CONTEXT_GET_CLASS (context)->clear_current (context))
         g_private_replace (&thread_current_context, NULL);
     }
 }
@@ -1228,11 +1324,11 @@ gdk_gl_context_clear_current (void)
 GdkGLContext *
 gdk_gl_context_get_current (void)
 {
-  GdkGLContext *current;
+  MaskedContext *current;
 
   current = g_private_get (&thread_current_context);
 
-  return current;
+  return unmask_context (current);
 }
 
 gboolean

gdk/gdkglcontext.h

@@ -45,8 +45,8 @@ GType gdk_gl_context_get_type (void) G_GNUC_CONST;
 GDK_AVAILABLE_IN_ALL
 GdkDisplay *            gdk_gl_context_get_display              (GdkGLContext  *context);
 GDK_AVAILABLE_IN_ALL
-GdkSurface *             gdk_gl_context_get_surface               (GdkGLContext  *context);
-GDK_AVAILABLE_IN_ALL
+GdkSurface *            gdk_gl_context_get_surface               (GdkGLContext  *context);
+GDK_DEPRECATED_IN_4_4_FOR(gdk_gl_context_is_shared)
 GdkGLContext *          gdk_gl_context_get_shared_context       (GdkGLContext  *context);
 GDK_AVAILABLE_IN_ALL
 void                    gdk_gl_context_get_version              (GdkGLContext  *context,
@@ -54,6 +54,9 @@ void                    gdk_gl_context_get_version              (GdkGLContext  *
                                                                  int           *minor);
 GDK_AVAILABLE_IN_ALL
 gboolean                gdk_gl_context_is_legacy                (GdkGLContext  *context);
+GDK_AVAILABLE_IN_4_4
+gboolean                gdk_gl_context_is_shared                (GdkGLContext  *self,
+                                                                 GdkGLContext  *other);
 
 GDK_AVAILABLE_IN_ALL
 void                    gdk_gl_context_set_required_version     (GdkGLContext  *context,

gdk/gdkglcontextprivate.h

@@ -27,6 +27,13 @@
 
 G_BEGIN_DECLS
 
+/* Version requirements for EGL contexts.
+ *
+ * If you add support for EGL to your backend, please require this.
+ */
+#define GDK_EGL_MIN_VERSION_MAJOR (1)
+#define GDK_EGL_MIN_VERSION_MINOR (4)
+
 #define GDK_GL_CONTEXT_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_GL_CONTEXT, GdkGLContextClass))
 #define GDK_IS_GL_CONTEXT_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_GL_CONTEXT))
 #define GDK_GL_CONTEXT_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_GL_CONTEXT, GdkGLContextClass))
@@ -45,10 +52,16 @@ struct _GdkGLContextClass
 {
   GdkDrawContextClass parent_class;
 
-  gboolean (* realize) (GdkGLContext *context,
-                        GError **error);
+  gboolean              (* realize)                             (GdkGLContext          *context,
+                                                                 GError               **error);
 
-  cairo_region_t * (* get_damage) (GdkGLContext *context);
+  gboolean              (* make_current)                        (GdkGLContext          *context,
+                                                                 gboolean               surfaceless);
+  gboolean              (* clear_current)                       (GdkGLContext          *context);
+  cairo_region_t *      (* get_damage)                          (GdkGLContext          *context);
+
+  gboolean              (* is_shared)                           (GdkGLContext          *self,
+                                                                 GdkGLContext          *other);
 };
 
 typedef struct {
@@ -73,6 +86,8 @@ typedef struct {
   guint use_es : 1;
 } GdkGLContextPaintData;
 
+GdkGLContext *          gdk_gl_context_new_for_surface          (GdkSurface      *surface);
+
 void                    gdk_gl_context_set_is_legacy            (GdkGLContext    *context,
                                                                  gboolean         is_legacy);
 

gdk/gdkgltexture.c

@@ -20,7 +20,8 @@
 
 #include "gdkgltextureprivate.h"
 
-#include "gdkcairo.h"
+#include "gdkdisplayprivate.h"
+#include "gdkmemorytextureprivate.h"
 #include "gdktextureprivate.h"
 
 #include <epoxy/gl.h>
@@ -37,7 +38,7 @@ struct _GdkGLTexture {
   GdkGLContext *context;
   guint id;
 
-  cairo_surface_t *saved;
+  GdkTexture *saved;
 
   GDestroyNotify destroy;
   gpointer data;
@@ -64,50 +65,258 @@ gdk_gl_texture_dispose (GObject *object)
   g_clear_object (&self->context);
   self->id = 0;
 
-  if (self->saved)
-    {
-      cairo_surface_destroy (self->saved);
-      self->saved = NULL;
-    }
+  g_clear_object (&self->saved);
 
   G_OBJECT_CLASS (gdk_gl_texture_parent_class)->dispose (object);
 }
 
-static void
-gdk_gl_texture_download (GdkTexture         *texture,
-                         const GdkRectangle *area,
-                         guchar             *data,
-                         gsize               stride)
+typedef struct _InvokeData
 {
-  GdkGLTexture *self = GDK_GL_TEXTURE (texture);
-  cairo_surface_t *surface;
-  cairo_t *cr;
+  GdkGLTexture *self;
+  volatile int spinlock;
+  GFunc func;
+  gpointer data;
+} InvokeData;
 
-  surface = cairo_image_surface_create_for_data (data,
-                                                 CAIRO_FORMAT_ARGB32,
-                                                 area->width, area->height,
-                                                 stride);
+static gboolean
+gdk_gl_texture_invoke_callback (gpointer data)
+{
+  InvokeData *invoke = data;
+  GdkGLContext *context;
 
-  cr = cairo_create (surface);
+  context = gdk_display_get_gl_context (gdk_gl_context_get_display (invoke->self->context));
 
-  if (self->saved)
+  gdk_gl_context_make_current (context);
+  glBindTexture (GL_TEXTURE_2D, invoke->self->id);
+
+  invoke->func (invoke->self, invoke->data);
+
+  g_atomic_int_set (&invoke->spinlock, 1);
+
+  return FALSE;
+}
+
+static void
+gdk_gl_texture_run (GdkGLTexture *self,
+                    GFunc         func,
+                    gpointer      data)
+{
+  InvokeData invoke = { self, 0, func, data };
+
+  g_main_context_invoke (NULL, gdk_gl_texture_invoke_callback, &invoke);
+
+  while (g_atomic_int_get (&invoke.spinlock) == 0);
+}
+
+static inline void
+gdk_gl_texture_get_tex_image (GdkGLTexture *self,
+                              GLenum        gl_format,
+                              GLenum        gl_type,
+                              GLvoid       *data)
+{
+  if (gdk_gl_context_get_use_es (self->context))
     {
-      cairo_set_source_surface (cr, self->saved, 0, 0);
-      cairo_paint (cr);
+      GdkTexture *texture = GDK_TEXTURE (self);
+      GLuint fbo;
+
+      glGenFramebuffers (1, &fbo);
+      glBindFramebuffer (GL_FRAMEBUFFER, fbo);
+      glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->id, 0);
+      glReadPixels (0, 0,
+                    texture->width, texture->height, 
+                    gl_format,
+                    gl_type,
+                    data);
+      glBindFramebuffer (GL_FRAMEBUFFER, 0);
+      glDeleteFramebuffers (1, &fbo);
     }
   else
     {
-      GdkSurface *gl_surface;
+      glGetTexImage (GL_TEXTURE_2D,
+                     0,
+                     gl_format,
+                     gl_type,
+                     data);
+    }
+}
+static void
+gdk_gl_texture_do_download_texture (gpointer texture_,
+                                    gpointer result_)
+{
+  GdkTexture *texture = texture_;
+  GdkTexture **result = result_;
+  GdkMemoryFormat format;
+  GLint internal_format, gl_format, gl_type;
+  guchar *data;
+  gsize stride;
+  GBytes *bytes;
 
-      gl_surface = gdk_gl_context_get_surface (self->context);
-      gdk_cairo_draw_from_gl (cr, gl_surface, self->id, GL_TEXTURE, 1, 
-                              area->x, area->y,
-                              area->width, area->height);
+  glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internal_format);
+
+  switch (internal_format)
+  {
+    case GL_RGB8:
+      format = GDK_MEMORY_R8G8B8;
+      gl_format = GL_RGB;
+      gl_type = GL_UNSIGNED_BYTE;
+      break;
+
+    case GL_RGBA8:
+      format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
+      gl_format = GL_RGBA;
+      gl_type = GL_UNSIGNED_BYTE;
+      break;
+
+    case GL_RGB16:
+      format = GDK_MEMORY_R16G16B16;
+      gl_format = GL_RGB;
+      gl_type = GL_UNSIGNED_SHORT;
+      break;
+
+    case GL_RGBA16:
+      format = GDK_MEMORY_R16G16B16A16_PREMULTIPLIED;
+      gl_format = GL_RGBA;
+      gl_type = GL_UNSIGNED_SHORT;
+      break;
+
+    case GL_RGB16F:
+      format = GDK_MEMORY_R16G16B16_FLOAT;
+      gl_format = GL_RGB;
+      gl_type = GL_HALF_FLOAT;
+      break;
+
+    case GL_RGBA16F:
+      format = GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED;
+      gl_format = GL_RGBA;
+      gl_type = GL_HALF_FLOAT;
+      break;
+
+    case GL_RGB32F:
+      format = GDK_MEMORY_R32G32B32_FLOAT;
+      gl_format = GL_RGB;
+      gl_type = GL_FLOAT;
+      break;
+
+    case GL_RGBA32F:
+      format = GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED;
+      gl_format = GL_RGBA;
+      gl_type = GL_FLOAT;
+      break;
+
+    default:
+      g_warning ("Texture in unexpected format 0x%X (%d). File a bug about adding it to GTK", internal_format, internal_format);
+      /* fallback to the dumbest possible format
+       * so that even age old GLES can do it */
+      format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
+      gl_format = GL_RGBA;
+      gl_type = GL_UNSIGNED_BYTE;
+      break;
+  }
+
+  stride = gdk_memory_format_bytes_per_pixel (format) * texture->width;
+  data = g_malloc (stride * texture->height);
+
+  gdk_gl_texture_get_tex_image (texture_,
+                                gl_format,
+                                gl_type,
+                                data);
+
+  bytes = g_bytes_new_take (data, stride * texture->height);
+  *result = gdk_memory_texture_new (texture->width,
+                                    texture->height,
+                                    format,
+                                    bytes,
+                                    stride);
+
+  g_bytes_unref (bytes);
+}
+
+static GdkTexture *
+gdk_gl_texture_download_texture (GdkTexture *texture)
+{
+  GdkGLTexture *self = GDK_GL_TEXTURE (texture);
+  GdkTexture *result;
+
+  if (self->saved)
+    return g_object_ref (self->saved);
+
+  gdk_gl_texture_run (self, gdk_gl_texture_do_download_texture, &result);
+
+  return result;
+}
+
+static void
+gdk_gl_texture_do_download (gpointer texture,
+                            gpointer data)
+{
+  glGetTexImage (GL_TEXTURE_2D,
+                 0,
+                 GL_BGRA,
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+                 GL_UNSIGNED_INT_8_8_8_8_REV,
+#elif G_BYTE_ORDER == G_BIG_ENDIAN
+                 GL_UNSIGNED_BYTE,
+#else
+#error "Unknown byte order for gdk_gl_texture_download()"
+#endif
+                 data);
+}
+
+static void
+gdk_gl_texture_download (GdkTexture *texture,
+                         guchar     *data,
+                         gsize       stride)
+{
+  GdkGLTexture *self = GDK_GL_TEXTURE (texture);
+
+  if (self->saved)
+    {
+      gdk_texture_download (self->saved, data, stride);
+      return;
     }
 
-  cairo_destroy (cr);
-  cairo_surface_finish (surface);
-  cairo_surface_destroy (surface);
+  if (gdk_gl_context_get_use_es (self->context) ||
+      stride != texture->width * 4)
+    {
+      GDK_TEXTURE_CLASS (gdk_gl_texture_parent_class)->download (texture, data, stride);
+      return;
+    }
+
+  gdk_gl_texture_run (self, gdk_gl_texture_do_download, data);
+}
+
+static void
+gdk_gl_texture_do_download_float (gpointer texture,
+                                  gpointer data)
+{
+  glGetTexImage (GL_TEXTURE_2D,
+                 0,
+                 GL_RGBA,
+                 GL_FLOAT,
+                 data);
+}
+
+static void
+gdk_gl_texture_download_float (GdkTexture *texture,
+                               float      *data,
+                               gsize       stride)
+{
+  GdkGLTexture *self = GDK_GL_TEXTURE (texture);
+
+  if (self->saved)
+    {
+      gdk_texture_download_float (self->saved, data, stride);
+      return;
+    }
+
+  if (gdk_gl_context_get_use_es (self->context) ||
+      stride != texture->width * 4)
+    {
+      GDK_TEXTURE_CLASS (gdk_gl_texture_parent_class)->download_float (texture, data, stride);
+      return;
+    }
+
+  gdk_gl_texture_run (self, gdk_gl_texture_do_download_float, data);
 }
 
 static void
@@ -116,7 +325,9 @@ gdk_gl_texture_class_init (GdkGLTextureClass *klass)
   GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 
+  texture_class->download_texture = gdk_gl_texture_download_texture;
   texture_class->download = gdk_gl_texture_download;
+  texture_class->download_float = gdk_gl_texture_download_float;
   gobject_class->dispose = gdk_gl_texture_dispose;
 }
 
@@ -150,24 +361,10 @@ gdk_gl_texture_get_id (GdkGLTexture *self)
 void
 gdk_gl_texture_release (GdkGLTexture *self)
 {
-  GdkSurface *surface;
-  GdkTexture *texture;
-  cairo_t *cr;
-
   g_return_if_fail (GDK_IS_GL_TEXTURE (self));
   g_return_if_fail (self->saved == NULL);
 
-  texture = GDK_TEXTURE (self);
-  self->saved = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
-                                            texture->width, texture->height);
-
-  cr = cairo_create (self->saved);
-
-  surface = gdk_gl_context_get_surface (self->context);
-  gdk_cairo_draw_from_gl (cr, surface, self->id, GL_TEXTURE, 1, 0, 0,
-                          texture->width, texture->height);
-
-  cairo_destroy (cr);
+  self->saved = gdk_texture_download_texture (GDK_TEXTURE (self));
 
   if (self->destroy)
     {

gdk/gdkhsla.c

@@ -17,12 +17,12 @@
 
 #include "config.h"
 
-#include "gtkhslaprivate.h"
+#include "gdkhslaprivate.h"
 
 #include <math.h>
 
 void
-_gtk_hsla_init_from_rgba (GtkHSLA       *hsla,
+_gdk_hsla_init_from_rgba (GdkHSLA       *hsla,
                           const GdkRGBA *rgba)
 {
   float min;
@@ -31,21 +31,21 @@ _gtk_hsla_init_from_rgba (GtkHSLA       *hsla,
   float green;
   float blue;
   float delta;
-  
+
   g_return_if_fail (hsla != NULL);
   g_return_if_fail (rgba != NULL);
 
   red = rgba->red;
   green = rgba->green;
   blue = rgba->blue;
-  
+
   if (red > green)
     {
       if (red > blue)
         max = red;
       else
         max = blue;
-      
+
       if (green < blue)
         min = green;
       else
@@ -57,25 +57,25 @@ _gtk_hsla_init_from_rgba (GtkHSLA       *hsla,
         max = green;
       else
         max = blue;
-      
+
       if (red < blue)
         min = red;
       else
         min = blue;
     }
-  
+
   hsla->lightness = (max + min) / 2;
   hsla->saturation = 0;
   hsla->hue = 0;
   hsla->alpha = rgba->alpha;
-  
+
   if (max != min)
     {
       if (hsla->lightness <= 0.5)
         hsla->saturation = (max - min) / (max + min);
       else
         hsla->saturation = (max - min) / (2 - max - min);
-      
+
       delta = max -min;
       if (red == max)
         hsla->hue = (green - blue) / delta;
@@ -83,7 +83,7 @@ _gtk_hsla_init_from_rgba (GtkHSLA       *hsla,
         hsla->hue = 2 + (blue - red) / delta;
       else if (blue == max)
         hsla->hue = 4 + (red - green) / delta;
-      
+
       hsla->hue *= 60;
       if (hsla->hue < 0.0)
         hsla->hue += 360;
@@ -92,22 +92,22 @@ _gtk_hsla_init_from_rgba (GtkHSLA       *hsla,
 
 void
 _gdk_rgba_init_from_hsla (GdkRGBA       *rgba,
-                          const GtkHSLA *hsla)
+                          const GdkHSLA *hsla)
 {
   float hue;
   float lightness;
   float saturation;
   float m1, m2;
-  
+
   lightness = hsla->lightness;
   saturation = hsla->saturation;
-  
+
   if (lightness <= 0.5)
     m2 = lightness * (1 + saturation);
   else
     m2 = lightness + saturation - lightness * saturation;
   m1 = 2 * lightness - m2;
-  
+
   rgba->alpha = hsla->alpha;
 
   if (saturation == 0)
@@ -123,7 +123,7 @@ _gdk_rgba_init_from_hsla (GdkRGBA       *rgba,
         hue -= 360;
       while (hue < 0)
         hue += 360;
-      
+
       if (hue < 60)
         rgba->red = m1 + (m2 - m1) * hue / 60;
       else if (hue < 180)
@@ -132,13 +132,13 @@ _gdk_rgba_init_from_hsla (GdkRGBA       *rgba,
         rgba->red = m1 + (m2 - m1) * (240 - hue) / 60;
       else
         rgba->red = m1;
-      
+
       hue = hsla->hue;
       while (hue > 360)
         hue -= 360;
       while (hue < 0)
         hue += 360;
-      
+
       if (hue < 60)
         rgba->green = m1 + (m2 - m1) * hue / 60;
       else if (hue < 180)
@@ -147,13 +147,13 @@ _gdk_rgba_init_from_hsla (GdkRGBA       *rgba,
         rgba->green = m1 + (m2 - m1) * (240 - hue) / 60;
       else
         rgba->green = m1;
-      
+
       hue = hsla->hue - 120;
       while (hue > 360)
         hue -= 360;
       while (hue < 0)
         hue += 360;
-      
+
       if (hue < 60)
         rgba->blue = m1 + (m2 - m1) * hue / 60;
       else if (hue < 180)
@@ -166,8 +166,8 @@ _gdk_rgba_init_from_hsla (GdkRGBA       *rgba,
 }
 
 void
-_gtk_hsla_shade (GtkHSLA       *dest,
-                 const GtkHSLA *src,
+_gdk_hsla_shade (GdkHSLA       *dest,
+                 const GdkHSLA *src,
                  float          factor)
 {
   g_return_if_fail (dest != NULL);

gdk/gdkhslaprivate.h

@@ -22,23 +22,23 @@
 
 G_BEGIN_DECLS
 
-typedef struct _GtkHSLA GtkHSLA;
+typedef struct _GdkHSLA GdkHSLA;
 
-struct _GtkHSLA {
+struct _GdkHSLA {
   float hue;
   float saturation;
   float lightness;
   float alpha;
 };
 
-void            _gtk_hsla_init_from_rgba    (GtkHSLA          *hsla,
+void            _gdk_hsla_init_from_rgba    (GdkHSLA          *hsla,
                                              const GdkRGBA    *rgba);
 /* Yes, I can name that function like this! */
 void            _gdk_rgba_init_from_hsla    (GdkRGBA          *rgba,
-                                             const GtkHSLA    *hsla);
+                                             const GdkHSLA    *hsla);
 
-void            _gtk_hsla_shade             (GtkHSLA          *dest,
-                                             const GtkHSLA    *src,
+void            _gdk_hsla_shade             (GdkHSLA          *dest,
+                                             const GdkHSLA    *src,
                                              float             factor);
 
 G_END_DECLS

gdk/gdkmemorytexture.c

@@ -20,6 +20,7 @@
 #include "config.h"
 
 #include "gdkmemorytextureprivate.h"
+#include "gsk/ngl/fp16private.h"
 
 /**
  * GdkMemoryTexture:
@@ -49,6 +50,10 @@ gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format)
 {
   switch (format)
     {
+    case GDK_MEMORY_R8G8B8:
+    case GDK_MEMORY_B8G8R8:
+      return 3;
+
     case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
     case GDK_MEMORY_A8R8G8B8_PREMULTIPLIED:
     case GDK_MEMORY_R8G8B8A8_PREMULTIPLIED:
@@ -58,9 +63,19 @@ gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format)
     case GDK_MEMORY_A8B8G8R8:
       return 4;
 
-    case GDK_MEMORY_R8G8B8:
-    case GDK_MEMORY_B8G8R8:
-      return 3;
+    case GDK_MEMORY_R16G16B16:
+    case GDK_MEMORY_R16G16B16_FLOAT:
+      return 6;
+
+    case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
+    case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
+      return 8;
+
+    case GDK_MEMORY_R32G32B32_FLOAT:
+      return 12;
+
+    case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
+      return 16;
 
     case GDK_MEMORY_N_FORMATS:
     default:
@@ -69,6 +84,41 @@ gdk_memory_format_bytes_per_pixel (GdkMemoryFormat format)
     }
 }
 
+static gsize
+gdk_memory_format_alignment (GdkMemoryFormat format)
+{
+  switch (format)
+    {
+    case GDK_MEMORY_R8G8B8:
+    case GDK_MEMORY_B8G8R8:
+    case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
+    case GDK_MEMORY_A8R8G8B8_PREMULTIPLIED:
+    case GDK_MEMORY_R8G8B8A8_PREMULTIPLIED:
+    case GDK_MEMORY_B8G8R8A8:
+    case GDK_MEMORY_A8R8G8B8:
+    case GDK_MEMORY_R8G8B8A8:
+    case GDK_MEMORY_A8B8G8R8:
+      return G_ALIGNOF (guchar);
+
+    case GDK_MEMORY_R16G16B16:
+    case GDK_MEMORY_R16G16B16_FLOAT:
+      return G_ALIGNOF (guint16);
+
+    case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
+    case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
+      return G_ALIGNOF (guint16);
+
+    case GDK_MEMORY_R32G32B32_FLOAT:
+    case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
+      return G_ALIGNOF (float);
+
+    case GDK_MEMORY_N_FORMATS:
+    default:
+      g_assert_not_reached ();
+      return G_ALIGNOF (double);
+    }
+}
+
 static void
 gdk_memory_texture_dispose (GObject *object)
 {
@@ -79,22 +129,41 @@ gdk_memory_texture_dispose (GObject *object)
   G_OBJECT_CLASS (gdk_memory_texture_parent_class)->dispose (object);
 }
 
+static GdkTexture *
+gdk_memory_texture_download_texture (GdkTexture *texture)
+{
+  return g_object_ref (texture);
+}
+
 static void
-gdk_memory_texture_download (GdkTexture         *texture,
-                             const GdkRectangle *area,
-                             guchar             *data,
-                             gsize               stride)
+gdk_memory_texture_download (GdkTexture *texture,
+                             guchar     *data,
+                             gsize       stride)
 {
   GdkMemoryTexture *self = GDK_MEMORY_TEXTURE (texture);
 
   gdk_memory_convert (data, stride,
-                      GDK_MEMORY_CAIRO_FORMAT_ARGB32,
-                      (guchar *) g_bytes_get_data (self->bytes, NULL)
-                        + area->x * gdk_memory_format_bytes_per_pixel (self->format)
-                        + area->y * self->stride,
+                      GDK_MEMORY_CONVERT_DOWNLOAD,
+                      (guchar *) g_bytes_get_data (self->bytes, NULL),
                       self->stride,
                       self->format,
-                      area->width, area->height);
+                      gdk_texture_get_width (texture),
+                      gdk_texture_get_height (texture));
+}
+
+static void
+gdk_memory_texture_download_float (GdkTexture *texture,
+                                   float      *data,
+                                   gsize       stride)
+{
+  GdkMemoryTexture *self = GDK_MEMORY_TEXTURE (texture);
+
+  gdk_memory_convert_to_float (data, stride,
+                               (guchar *) g_bytes_get_data (self->bytes, NULL),
+                               self->stride,
+                               self->format,
+                               gdk_texture_get_width (texture),
+                               gdk_texture_get_height (texture));
 }
 
 static void
@@ -103,7 +172,9 @@ gdk_memory_texture_class_init (GdkMemoryTextureClass *klass)
   GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 
+  texture_class->download_texture = gdk_memory_texture_download_texture;
   texture_class->download = gdk_memory_texture_download;
+  texture_class->download_float = gdk_memory_texture_download_float;
   gobject_class->dispose = gdk_memory_texture_dispose;
 }
 
@@ -112,6 +183,41 @@ gdk_memory_texture_init (GdkMemoryTexture *self)
 {
 }
 
+static GBytes *
+gdk_memory_sanitize (GBytes          *bytes,
+                     int              width,
+                     int              height,
+                     GdkMemoryFormat  format,
+                     gsize            stride,
+                     gsize           *out_stride)
+{
+  gsize align, size, copy_stride, bpp;
+  const guchar *data;
+  guchar *copy;
+  int y;
+
+  data = g_bytes_get_data (bytes, &size);
+  align = gdk_memory_format_alignment (format);
+
+  if (GPOINTER_TO_SIZE (data) % align == 0 &&
+      stride % align == 0)
+    {
+      *out_stride = stride;
+      return g_bytes_ref (bytes);
+    }
+
+  bpp = gdk_memory_format_bytes_per_pixel (format);
+  copy_stride = bpp * width;
+  /* align to multiples of 4, just to be sure */
+  copy_stride = (copy_stride + 3) & ~3;
+  copy = g_malloc (copy_stride * height);
+  for (y = 0; y < height; y++)
+    memcpy (copy + y * copy_stride, data + y * stride, bpp * width);
+
+  *out_stride = copy_stride;
+  return g_bytes_new_take (copy, copy_stride * height);
+}
+
 /**
  * gdk_memory_texture_new:
  * @width: the width of the texture
@@ -136,13 +242,20 @@ gdk_memory_texture_new (int              width,
 {
   GdkMemoryTexture *self;
 
+  g_return_val_if_fail (width > 0, NULL);
+  g_return_val_if_fail (height > 0, NULL);
+  g_return_val_if_fail (bytes != NULL, NULL);
+  g_return_val_if_fail (stride >= width * gdk_memory_format_bytes_per_pixel (format), NULL);
+
+  bytes = gdk_memory_sanitize (bytes, width, height, format, stride, &stride);
+
   self = g_object_new (GDK_TYPE_MEMORY_TEXTURE,
                        "width", width,
                        "height", height,
                        NULL);
 
   self->format = format;
-  self->bytes = g_bytes_ref (bytes);
+  self->bytes = bytes;
   self->stride = stride;
 
   return GDK_TEXTURE (self);
@@ -283,6 +396,109 @@ SWIZZLE_PREMULTIPLY (3,0,1,2, 0,1,2,3)
 SWIZZLE_PREMULTIPLY (3,0,1,2, 3,0,1,2)
 SWIZZLE_PREMULTIPLY (3,0,1,2, 0,3,2,1)
 
+#define CONVERT_FUNC(name,suffix,R,G,B,A,step) \
+static void \
+convert_ ## name ## _to_ ## suffix (guchar       *dest_data, \
+                                    gsize         dest_stride, \
+                                    const guchar *src_data, \
+                                    gsize         src_stride, \
+                                    gsize         width, \
+                                    gsize         height) \
+{ \
+  gsize x, y; \
+\
+  for (y = 0; y < height; y++) \
+    { \
+      for (x = 0; x < width; x++) \
+        { \
+          guchar conv[4]; \
+          convert_pixel_ ## name (conv, src_data + step * x); \
+          dest_data[4 * x + R] = conv[0]; \
+          dest_data[4 * x + G] = conv[1]; \
+          dest_data[4 * x + B] = conv[2]; \
+          dest_data[4 * x + A] = conv[3]; \
+        } \
+\
+      dest_data += dest_stride; \
+      src_data += src_stride; \
+    } \
+}
+
+#define CONVERT_FUNCS(name,step) \
+CONVERT_FUNC(name, download_le, 2, 1, 0, 3, step) \
+CONVERT_FUNC(name, download_be, 1, 2, 3, 0, step) \
+CONVERT_FUNC(name, gles_rgba, 0, 1, 2, 3, step) \
+
+static inline void
+convert_pixel_rgb16 (guchar *dest_data, const guchar *src_data)
+{
+  const guint16 *src = (const guint16 *) src_data;
+  dest_data[0] = (guchar)(src[0] >> 8);
+  dest_data[1] = (guchar)(src[1] >> 8);
+  dest_data[2] = (guchar)(src[2] >> 8);
+  dest_data[3] = 0xFF;
+}
+CONVERT_FUNCS(rgb16, 3 * sizeof (guint16))
+
+static inline void
+convert_pixel_rgba16 (guchar *dest_data, const guchar *src_data)
+{
+  const guint16 *src = (const guint16 *) src_data;
+  dest_data[0] = (guchar)(src[0] >> 8);
+  dest_data[1] = (guchar)(src[1] >> 8);
+  dest_data[2] = (guchar)(src[2] >> 8);
+  dest_data[3] = (guchar)(src[3] >> 8);
+}
+CONVERT_FUNCS(rgba16, 4 * sizeof (guint16))
+
+static inline void
+convert_pixel_rgb16f (guchar *dest_data, const guchar *src_data)
+{
+  float src[4];
+  guint16 tmp[4];
+  memcpy(tmp, src_data, sizeof(guint16) * 3);
+  half_to_float4(tmp, src);
+  dest_data[0] = CLAMP (src[0] * 256.f, 0.f, 255.f);
+  dest_data[1] = CLAMP (src[1] * 256.f, 0.f, 255.f);
+  dest_data[2] = CLAMP (src[2] * 256.f, 0.f, 255.f);
+  dest_data[3] = 0xFF;
+}
+CONVERT_FUNCS(rgb16f, 3 * sizeof (guint16))
+
+static inline void
+convert_pixel_rgba16f (guchar *dest_data, const guchar *src_data)
+{
+  float src[4];
+  half_to_float4((const guint16 *) src_data, src);
+  dest_data[0] = CLAMP (src[0] * 256.f, 0.f, 255.f);
+  dest_data[1] = CLAMP (src[1] * 256.f, 0.f, 255.f);
+  dest_data[2] = CLAMP (src[2] * 256.f, 0.f, 255.f);
+  dest_data[3] = CLAMP (src[3] * 256.f, 0.f, 255.f);
+}
+CONVERT_FUNCS(rgba16f, 4 * sizeof (guint16))
+
+static inline void
+convert_pixel_rgb32f (guchar *dest_data, const guchar *src_data)
+{
+  float *src = (float *) src_data;
+  dest_data[0] = CLAMP (src[0] * 256.f, 0.f, 255.f);
+  dest_data[1] = CLAMP (src[1] * 256.f, 0.f, 255.f);
+  dest_data[2] = CLAMP (src[2] * 256.f, 0.f, 255.f);
+  dest_data[3] = 0xFF;
+}
+CONVERT_FUNCS(rgb32f, 3 * sizeof (float))
+
+static inline void
+convert_pixel_rgba32f (guchar *dest_data, const guchar *src_data)
+{
+  float *src = (float *) src_data;
+  dest_data[0] = CLAMP (src[0] * 256.f, 0.f, 255.f);
+  dest_data[1] = CLAMP (src[1] * 256.f, 0.f, 255.f);
+  dest_data[2] = CLAMP (src[2] * 256.f, 0.f, 255.f);
+  dest_data[3] = CLAMP (src[3] * 256.f, 0.f, 255.f);
+}
+CONVERT_FUNCS(rgba32f, 4 * sizeof (float))
+
 typedef void (* ConversionFunc) (guchar       *dest_data,
                                  gsize         dest_stride,
                                  const guchar *src_data,
@@ -290,7 +506,7 @@ typedef void (* ConversionFunc) (guchar       *dest_data,
                                  gsize         width,
                                  gsize         height);
 
-static ConversionFunc converters[GDK_MEMORY_N_FORMATS][3] =
+static ConversionFunc converters[GDK_MEMORY_N_FORMATS][GDK_MEMORY_N_CONVERSIONS] =
 {
   { convert_memcpy, convert_swizzle3210, convert_swizzle2103 },
   { convert_swizzle3210, convert_memcpy, convert_swizzle3012 },
@@ -300,21 +516,192 @@ static ConversionFunc converters[GDK_MEMORY_N_FORMATS][3] =
   { convert_swizzle_premultiply_3210_3012, convert_swizzle_premultiply_0123_3012, convert_swizzle_premultiply_3012_3012 },
   { convert_swizzle_premultiply_3210_0321, convert_swizzle_premultiply_0123_0321, convert_swizzle_premultiply_3012_0321 },
   { convert_swizzle_opaque_3210, convert_swizzle_opaque_0123, convert_swizzle_opaque_3012 },
-  { convert_swizzle_opaque_3012, convert_swizzle_opaque_0321, convert_swizzle_opaque_3210 }
+  { convert_swizzle_opaque_3012, convert_swizzle_opaque_0321, convert_swizzle_opaque_3210 },
+  { convert_rgb16_to_download_le, convert_rgb16_to_download_be, convert_rgb16_to_gles_rgba },
+  { convert_rgba16_to_download_le, convert_rgba16_to_download_be, convert_rgba16_to_gles_rgba },
+  { convert_rgb16f_to_download_le, convert_rgb16f_to_download_be, convert_rgb16f_to_gles_rgba },
+  { convert_rgba16f_to_download_le, convert_rgba16f_to_download_be, convert_rgba16f_to_gles_rgba },
+  { convert_rgb32f_to_download_le, convert_rgb32f_to_download_be, convert_rgb32f_to_gles_rgba },
+  { convert_rgba32f_to_download_le, convert_rgba32f_to_download_be, convert_rgba32f_to_gles_rgba }
 };
 
 void
-gdk_memory_convert (guchar          *dest_data,
-                    gsize            dest_stride,
-                    GdkMemoryFormat  dest_format,
-                    const guchar    *src_data,
-                    gsize            src_stride,
-                    GdkMemoryFormat  src_format,
-                    gsize            width,
-                    gsize            height)
+gdk_memory_convert (guchar              *dest_data,
+                    gsize                dest_stride,
+                    GdkMemoryConversion  dest_format,
+                    const guchar        *src_data,
+                    gsize                src_stride,
+                    GdkMemoryFormat      src_format,
+                    gsize                width,
+                    gsize                height)
 {
   g_assert (dest_format < 3);
   g_assert (src_format < GDK_MEMORY_N_FORMATS);
 
   converters[src_format][dest_format] (dest_data, dest_stride, src_data, src_stride, width, height);
 }
+
+#define CONVERT_FLOAT(R,G,B,A,premultiply) G_STMT_START {\
+  for (y = 0; y < height; y++) \
+    { \
+      for (x = 0; x < width; x++) \
+        { \
+          if (A >= 0) \
+            { \
+              dest_data[4 * x + 0] = src_data[4 * x + R] / 255.0f; \
+              dest_data[4 * x + 1] = src_data[4 * x + G] / 255.0f; \
+              dest_data[4 * x + 2] = src_data[4 * x + B] / 255.0f; \
+              dest_data[4 * x + 3] = src_data[4 * x + A] / 255.0f; \
+              if (premultiply) \
+                { \
+                  dest_data[4 * x + 0] *= dest_data[4 * x + 3]; \
+                  dest_data[4 * x + 1] *= dest_data[4 * x + 3]; \
+                  dest_data[4 * x + 2] *= dest_data[4 * x + 3]; \
+                } \
+            } \
+          else \
+            { \
+              dest_data[4 * x + 0] = src_data[3 * x + R] / 255.0f; \
+              dest_data[4 * x + 1] = src_data[3 * x + G] / 255.0f; \
+              dest_data[4 * x + 2] = src_data[3 * x + B] / 255.0f; \
+              dest_data[4 * x + 3] = 1.0; \
+            } \
+        } \
+\
+      dest_data += dest_stride; \
+      src_data += src_stride; \
+    } \
+}G_STMT_END
+
+#define CONVERT_FLOAT_PIXEL(func,step) G_STMT_START{\
+  for (y = 0; y < height; y++) \
+    { \
+      for (x = 0; x < width; x++) \
+        { \
+          func (dest_data + 4 * x, src_data + step * x); \
+        } \
+\
+      dest_data += dest_stride; \
+      src_data += src_stride; \
+    } \
+}G_STMT_END
+
+static inline void
+convert_rgb16_to_float (float *dest, const guchar *src_data)
+{
+  const guint16 *src = (const guint16 *) src_data;
+  dest[0] = src[0] / 65535.f;
+  dest[1] = src[1] / 65535.f;
+  dest[2] = src[2] / 65535.f;
+  dest[3] = 1.0;
+}
+
+static inline void
+convert_rgba16_to_float (float *dest, const guchar *src_data)
+{
+  const guint16 *src = (const guint16 *) src_data;
+  dest[0] = src[0] / 65535.f;
+  dest[1] = src[1] / 65535.f;
+  dest[2] = src[2] / 65535.f;
+  dest[3] = src[3] / 65535.f;
+}
+
+static inline void
+convert_rgb16f_to_float (float *dest, const guchar *src_data)
+{
+  guint16 tmp[4];
+  memcpy(tmp, src_data, sizeof(guint16) * 3);
+  tmp[3] = FP16_ONE;
+  half_to_float4 (tmp, dest);
+}
+
+static inline void
+convert_rgba16f_to_float (float *dest, const guchar *src_data)
+{
+  half_to_float4 ((const guint16 *) src_data, dest);
+}
+
+static inline void
+convert_rgb32f_to_float (float *dest, const guchar *src_data)
+{
+  const float *src = (const float *) src_data;
+  dest[0] = src[0];
+  dest[1] = src[1];
+  dest[2] = src[2];
+  dest[3] = 1.0;
+}
+
+static inline void
+convert_rgba32f_to_float (float *dest, const guchar *src_data)
+{
+  const float *src = (const float *) src_data;
+  dest[0] = src[0];
+  dest[1] = src[1];
+  dest[2] = src[2];
+  dest[3] = src[3];
+}
+
+void
+gdk_memory_convert_to_float (float           *dest_data,
+                             gsize            dest_stride,
+                             const guchar    *src_data,
+                             gsize            src_stride,
+                             GdkMemoryFormat  src_format,
+                             gsize            width,
+                             gsize            height)
+{
+  gsize x, y;
+
+  switch (src_format)
+  {
+    case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
+      CONVERT_FLOAT (2, 1, 0, 3, FALSE);
+      break;
+    case GDK_MEMORY_A8R8G8B8_PREMULTIPLIED:
+      CONVERT_FLOAT (1, 2, 3, 0, FALSE);
+      break;
+    case GDK_MEMORY_R8G8B8A8_PREMULTIPLIED:
+      CONVERT_FLOAT (0, 1, 2, 3, FALSE);
+      break;
+    case GDK_MEMORY_B8G8R8A8:
+      CONVERT_FLOAT (2, 1, 0, 3, TRUE);
+      break;
+    case GDK_MEMORY_A8R8G8B8:
+      CONVERT_FLOAT (1, 2, 3, 0, TRUE);
+      break;
+    case GDK_MEMORY_R8G8B8A8:
+      CONVERT_FLOAT (0, 1, 2, 3, TRUE);
+      break;
+    case GDK_MEMORY_A8B8G8R8:
+      CONVERT_FLOAT (3, 2, 1, 0, TRUE);
+      break;
+    case GDK_MEMORY_R8G8B8:
+      CONVERT_FLOAT (0, 1, 2, -1, FALSE);
+      break;
+    case GDK_MEMORY_B8G8R8:
+      CONVERT_FLOAT (2, 1, 0, -1, FALSE);
+      break;
+    case GDK_MEMORY_R16G16B16:
+      CONVERT_FLOAT_PIXEL (convert_rgb16_to_float, 3 * sizeof (guint16));
+      break;
+    case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
+      CONVERT_FLOAT_PIXEL (convert_rgba16_to_float, 4 * sizeof (guint16));
+      break;
+    case GDK_MEMORY_R16G16B16_FLOAT:
+      CONVERT_FLOAT_PIXEL (convert_rgb16f_to_float, 3 * sizeof (guint16));
+      break;
+    case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
+      CONVERT_FLOAT_PIXEL (convert_rgba16f_to_float, 4 * sizeof (guint16));
+      break;
+    case GDK_MEMORY_R32G32B32_FLOAT:
+      CONVERT_FLOAT_PIXEL (convert_rgb32f_to_float, 3 * sizeof (float));
+      break;
+    case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
+      CONVERT_FLOAT_PIXEL (convert_rgba32f_to_float, 4 * sizeof (float));
+      break;
+
+    case GDK_MEMORY_N_FORMATS:
+    default:
+      g_assert_not_reached();
+  }
+}

gdk/gdkmemorytexture.h

@@ -42,6 +42,20 @@ G_BEGIN_DECLS
  * @GDK_MEMORY_A8B8G8R8: 4 bytes; for alpha, blue, green, red.
  * @GDK_MEMORY_R8G8B8: 3 bytes; for red, green, blue. The data is opaque.
  * @GDK_MEMORY_B8G8R8: 3 bytes; for blue, green, red. The data is opaque.
+ * @GDK_MEMORY_R16G16B16: 3 guint16 values; for red, green, blue. Since 4.6
+ * @GDK_MEMORY_R16G16B16A16_PREMULTIPLIED: 4 guint16 values; for red, green,
+ *   blue, alpha. The color values are premultiplied with the alpha value.
+ *   Since 4.6
+ * @GDK_MEMORY_R16G16B16_FLOAT: 3 half-float values; for red, green, blue.
+ *   The data is opaque. Since 4.6
+ * @GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED: 4 half-float values; for
+ *   red, green, blue and alpha. The color values are premultiplied with
+ *   the alpha value. Since 4.6
+ * @GDK_MEMORY_B32G32R32_FLOAT: 3 float values; for blue, green, red.
+ *   The data is opaque. Since 4.6
+ * @GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED: 4 float values; for
+ *   red, green, blue and alpha. The color values are premultiplied with
+ *   the alpha value. Since 4.6
  * @GDK_MEMORY_N_FORMATS: The number of formats. This value will change as
  *   more formats get added, so do not rely on its concrete integer.
  *
@@ -67,6 +81,12 @@ typedef enum {
   GDK_MEMORY_A8B8G8R8,
   GDK_MEMORY_R8G8B8,
   GDK_MEMORY_B8G8R8,
+  GDK_MEMORY_R16G16B16,
+  GDK_MEMORY_R16G16B16A16_PREMULTIPLIED,
+  GDK_MEMORY_R16G16B16_FLOAT,
+  GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED,
+  GDK_MEMORY_R32G32B32_FLOAT,
+  GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED,
 
   GDK_MEMORY_N_FORMATS
 } GdkMemoryFormat;

gdk/gdkmemorytextureprivate.h

@@ -29,7 +29,21 @@ G_BEGIN_DECLS
 #define GDK_MEMORY_GDK_PIXBUF_OPAQUE GDK_MEMORY_R8G8B8
 #define GDK_MEMORY_GDK_PIXBUF_ALPHA GDK_MEMORY_R8G8B8A8
 
-#define GDK_MEMORY_CAIRO_FORMAT_ARGB32 GDK_MEMORY_DEFAULT
+typedef enum {
+  GDK_MEMORY_CONVERT_DOWNLOAD_LITTLE_ENDIAN,
+  GDK_MEMORY_CONVERT_DOWNLOAD_BIT_ENDIAN,
+  GDK_MEMORY_CONVERT_GLES_RGBA,
+
+  GDK_MEMORY_N_CONVERSIONS
+} GdkMemoryConversion;
+
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+#define GDK_MEMORY_CONVERT_DOWNLOAD GDK_MEMORY_CONVERT_DOWNLOAD_LITTLE_ENDIAN
+#elif G_BYTE_ORDER == G_BIG_ENDIAN
+#define GDK_MEMORY_CONVERT_DOWNLOAD GDK_MEMORY_CONVERT_DOWNLOAD_BIG_ENDIAN
+#else
+#error "Unknown byte order for GDK_MEMORY_CONVERT_DOWNLOAD"
+#endif
 
 gsize                   gdk_memory_format_bytes_per_pixel   (GdkMemoryFormat    format);
 
@@ -37,14 +51,22 @@ GdkMemoryFormat         gdk_memory_texture_get_format       (GdkMemoryTexture  *
 const guchar *          gdk_memory_texture_get_data         (GdkMemoryTexture  *self);
 gsize                   gdk_memory_texture_get_stride       (GdkMemoryTexture  *self);
 
-void                    gdk_memory_convert                  (guchar            *dest_data,
-                                                             gsize              dest_stride,
-                                                             GdkMemoryFormat    dest_format,
-                                                             const guchar      *src_data,
-                                                             gsize              src_stride,
-                                                             GdkMemoryFormat    src_format,
-                                                             gsize              width,
-                                                             gsize              height);
+void                    gdk_memory_convert                  (guchar                     *dest_data,
+                                                             gsize                       dest_stride,
+                                                             GdkMemoryConversion         dest_format,
+                                                             const guchar               *src_data,
+                                                             gsize                       src_stride,
+                                                             GdkMemoryFormat             src_format,
+                                                             gsize                       width,
+                                                             gsize                       height);
+
+void                    gdk_memory_convert_to_float         (float                      *dest_data,
+                                                             gsize                       dest_stride,
+                                                             const guchar               *src_data,
+                                                             gsize                       src_stride,
+                                                             GdkMemoryFormat             src_format,
+                                                             gsize                       width,
+                                                             gsize                       height);
 
 
 G_END_DECLS

gdk/gdkpaintable.h

@@ -70,17 +70,17 @@ typedef enum {
  *   snapshot at or 0 if none. This is purely a hint. The object must still
  *   be able to render at any size.
  * @get_intrinsic_aspect_ratio: The preferred aspect ratio for this object
- *   or 0 if none. If both [vfunc@Gdk.PaintableInterface.get_intrinsic_width]
- *   and [vfunc@Gdk.PaintableInterface.get_intrinsic_height] return non-zero
+ *   or 0 if none. If both [vfunc@Gdk.Paintable.get_intrinsic_width]
+ *   and [vfunc@Gdk.Paintable.get_intrinsic_height] return non-zero
  *   values, this function should return the aspect ratio computed from those.
  *
  * The list of functions that can be implemented for the `GdkPaintable`
  * interface.
  *
- * Note that apart from the [vfunc@Gdk.PaintableInterface.snapshot] function,
+ * Note that apart from the [vfunc@Gdk.Paintable.snapshot] function,
  * no virtual function of this interface is mandatory to implement, though it
- * is a good idea to implement [vfunc@Gdk.PaintableInterface.get_current_image]
- * for non-static paintables and [vfunc@Gdk.PaintableInterface.get_flags] if the
+ * is a good idea to implement [vfunc@Gdk.Paintable.get_current_image]
+ * for non-static paintables and [vfunc@Gdk.Paintable.get_flags] if the
  * image is not dynamic as the default implementation returns no flags and
  * that will make the implementation likely quite slow.
  */

gdk/gdkrgba.c

@@ -30,6 +30,7 @@
 #include <errno.h>
 #include <math.h>
 
+#include "gdkhslaprivate.h"
 
 G_DEFINE_BOXED_TYPE (GdkRGBA, gdk_rgba,
                      gdk_rgba_copy, gdk_rgba_free)
@@ -186,6 +187,7 @@ gdk_rgba_parse (GdkRGBA    *rgba,
                 const char *spec)
 {
   gboolean has_alpha;
+  gboolean is_hsl;
   double r, g, b, a;
   char *str = (char *) spec;
   char *p;
@@ -196,11 +198,26 @@ gdk_rgba_parse (GdkRGBA    *rgba,
   if (strncmp (str, "rgba", 4) == 0)
     {
       has_alpha = TRUE;
+      is_hsl = FALSE;
       str += 4;
     }
   else if (strncmp (str, "rgb", 3) == 0)
     {
       has_alpha = FALSE;
+      is_hsl = FALSE;
+      a = 1;
+      str += 3;
+    }
+  else if (strncmp (str, "hsla", 4) == 0)
+    {
+      has_alpha = TRUE;
+      is_hsl = TRUE;
+      str += 4;
+    }
+  else if (strncmp (str, "hsl", 3) == 0)
+    {
+      has_alpha = FALSE;
+      is_hsl = TRUE;
       a = 1;
       str += 3;
     }
@@ -291,10 +308,22 @@ gdk_rgba_parse (GdkRGBA    *rgba,
 
   if (rgba)
     {
-      rgba->red = CLAMP (r, 0, 1);
-      rgba->green = CLAMP (g, 0, 1);
-      rgba->blue = CLAMP (b, 0, 1);
-      rgba->alpha = CLAMP (a, 0, 1);
+      if (is_hsl)
+        {
+          GdkHSLA hsla;
+          hsla.hue = r * 255;
+          hsla.saturation = CLAMP (g, 0, 1);
+          hsla.lightness = CLAMP (b, 0, 1);
+          hsla.alpha = CLAMP (a, 0, 1);
+          _gdk_rgba_init_from_hsla (rgba, &hsla);
+        }
+      else
+        {
+          rgba->red = CLAMP (r, 0, 1);
+          rgba->green = CLAMP (g, 0, 1);
+          rgba->blue = CLAMP (b, 0, 1);
+          rgba->alpha = CLAMP (a, 0, 1);
+        }
     }
 
   return TRUE;
@@ -462,6 +491,47 @@ parse_color_channel (GtkCssParser *parser,
   }
 }
 
+static guint
+parse_hsla_color_channel (GtkCssParser *parser,
+                          guint         arg,
+                          gpointer      data)
+{
+  GdkHSLA *hsla = data;
+  double dvalue;
+
+  switch (arg)
+  {
+    case 0:
+      if (!gtk_css_parser_consume_number (parser, &dvalue))
+        return 0;
+      hsla->hue = dvalue;
+      return 1;
+
+    case 1:
+      if (!gtk_css_parser_consume_percentage (parser, &dvalue))
+        return 0;
+      hsla->saturation = CLAMP (dvalue, 0.0, 100.0) / 100.0;
+      return 1;
+
+    case 2:
+      if (!gtk_css_parser_consume_percentage (parser, &dvalue))
+        return 0;
+      hsla->lightness = CLAMP (dvalue, 0.0, 100.0) / 100.0;
+      return 1;
+
+    case 3:
+      if (!gtk_css_parser_consume_number (parser, &dvalue))
+        return 0;
+
+      hsla->alpha = CLAMP (dvalue, 0.0, 1.0) / 1.0;
+      return 1;
+
+    default:
+      g_assert_not_reached ();
+      return 0;
+  }
+}
+
 static gboolean
 rgba_init_chars (GdkRGBA    *rgba,
                  const char  s[8])
@@ -501,6 +571,18 @@ gdk_rgba_parser_parse (GtkCssParser *parser,
     {
       return gtk_css_parser_consume_function (parser, 4, 4, parse_color_channel, rgba);
     }
+  else if (gtk_css_token_is_function (token, "hsl") || gtk_css_token_is_function (token, "hsla"))
+    {
+      GdkHSLA hsla;
+
+      hsla.alpha = 1.0;
+
+      if (!gtk_css_parser_consume_function (parser, 3, 4, parse_hsla_color_channel, &hsla))
+        return FALSE;
+
+      _gdk_rgba_init_from_hsla (rgba, &hsla);
+      return TRUE;
+    }
   else if (gtk_css_token_is (token, GTK_CSS_TOKEN_HASH_ID) ||
            gtk_css_token_is (token, GTK_CSS_TOKEN_HASH_UNRESTRICTED))
     {

gdk/gdkrgba.h

@@ -67,7 +67,7 @@ GDK_AVAILABLE_IN_ALL
 gboolean  gdk_rgba_parse     (GdkRGBA       *rgba,
                               const char    *spec);
 GDK_AVAILABLE_IN_ALL
-char *   gdk_rgba_to_string (const GdkRGBA *rgba);
+char *   gdk_rgba_to_string (const GdkRGBA *rgba) G_GNUC_MALLOC;
 
 
 G_END_DECLS

gdk/gdksurface.c

@@ -1065,87 +1065,23 @@ gdk_surface_get_mapped (GdkSurface *surface)
   return GDK_SURFACE_IS_MAPPED (surface);
 }
 
-GdkGLContext *
-gdk_surface_get_shared_data_gl_context (GdkSurface *surface)
-{
-  static int in_shared_data_creation;
-  GdkDisplay *display;
-  GdkGLContext *context;
-
-  if (in_shared_data_creation)
-    return NULL;
-
-  in_shared_data_creation = 1;
-
-  display = gdk_surface_get_display (surface);
-  context = (GdkGLContext *)g_object_get_data (G_OBJECT (display), "gdk-gl-shared-data-context");
-  if (context == NULL)
-    {
-      GError *error = NULL;
-      context = GDK_SURFACE_GET_CLASS (surface)->create_gl_context (surface, FALSE, NULL, &error);
-      if (context == NULL)
-        {
-          g_warning ("Failed to create shared context: %s", error->message);
-          g_clear_error (&error);
-        }
-
-      gdk_gl_context_realize (context, &error);
-      if (context == NULL)
-        {
-          g_warning ("Failed to realize shared context: %s", error->message);
-          g_clear_error (&error);
-        }
-
-
-      g_object_set_data (G_OBJECT (display), "gdk-gl-shared-data-context", context);
-    }
-
-  in_shared_data_creation = 0;
-
-  return context;
-}
-
 GdkGLContext *
 gdk_surface_get_paint_gl_context (GdkSurface  *surface,
-                                  GError    **error)
+                                  GError     **error)
 {
-  GError *internal_error = NULL;
-
-  if (GDK_DISPLAY_DEBUG_CHECK (surface->display, GL_DISABLE))
-    {
-      g_set_error_literal (error, GDK_GL_ERROR,
-                           GDK_GL_ERROR_NOT_AVAILABLE,
-                           _("GL support disabled via GDK_DEBUG"));
-      return NULL;
-    }
+  if (!gdk_display_prepare_gl (surface->display, error))
+    return NULL;
 
   if (surface->gl_paint_context == NULL)
     {
-      GdkSurfaceClass *class = GDK_SURFACE_GET_CLASS (surface);
-
-      if (class->create_gl_context == NULL)
-        {
-          g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
-                               _("The current backend does not support OpenGL"));
-          return NULL;
-        }
-
-      surface->gl_paint_context =
-        class->create_gl_context (surface, TRUE, NULL, &internal_error);
+      surface->gl_paint_context = gdk_surface_create_gl_context (surface, error);
+      if (surface->gl_paint_context == NULL)
+        return NULL;
     }
 
-  if (internal_error != NULL)
+  if (!gdk_gl_context_realize (surface->gl_paint_context, error))
     {
-      g_propagate_error (error, internal_error);
-      g_clear_object (&(surface->gl_paint_context));
-      return NULL;
-    }
-
-  gdk_gl_context_realize (surface->gl_paint_context, &internal_error);
-  if (internal_error != NULL)
-    {
-      g_propagate_error (error, internal_error);
-      g_clear_object (&(surface->gl_paint_context));
+      g_clear_object (&surface->gl_paint_context);
       return NULL;
     }
 
@@ -1170,19 +1106,13 @@ GdkGLContext *
 gdk_surface_create_gl_context (GdkSurface   *surface,
                                GError      **error)
 {
-  GdkGLContext *paint_context;
-
   g_return_val_if_fail (GDK_IS_SURFACE (surface), NULL);
   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 
-  paint_context = gdk_surface_get_paint_gl_context (surface, error);
-  if (paint_context == NULL)
+  if (!gdk_display_prepare_gl (surface->display, error))
     return NULL;
 
-  return GDK_SURFACE_GET_CLASS (surface)->create_gl_context (surface,
-                                                             FALSE,
-                                                             paint_context,
-                                                             error);
+  return gdk_gl_context_new_for_surface (surface);
 }
 
 /**

gdk/gdksurfaceprivate.h

@@ -160,10 +160,6 @@ struct _GdkSurfaceClass
 
   void         (* set_opaque_region)      (GdkSurface      *surface,
                                            cairo_region_t *region);
-  GdkGLContext *(*create_gl_context)      (GdkSurface      *surface,
-                                           gboolean        attached,
-                                           GdkGLContext   *share,
-                                           GError        **error);
   void         (* request_layout)         (GdkSurface     *surface);
   gboolean     (* compute_size)           (GdkSurface     *surface);
 };
@@ -266,7 +262,6 @@ void       _gdk_surface_update_size       (GdkSurface      *surface);
 
 GdkGLContext * gdk_surface_get_paint_gl_context (GdkSurface *surface,
                                                  GError   **error);
-GdkGLContext * gdk_surface_get_shared_data_gl_context (GdkSurface *surface);
 
 gboolean gdk_surface_handle_event (GdkEvent       *event);
 GdkSeat * gdk_surface_get_seat_from_event (GdkSurface *surface,

gdk/gdktexture.c

@@ -28,8 +28,8 @@
  * `GdkPixbuf`, or a Cairo surface, or other pixel data.
  *
  * The ownership of the pixel data is transferred to the `GdkTexture`
- * instance; you can only make a copy of it, via
- * [method@Gdk.Texture.download].
+ * instance; you can only make a copy of it, via [method@Gdk.Texture.download]
+ * or [method@Gdk.Texture.download_float].
  *
  * `GdkTexture` is an immutable object: That means you cannot change
  * anything about it other than increasing the reference count via
@@ -41,11 +41,17 @@
 #include "gdktextureprivate.h"
 
 #include "gdkinternals.h"
+#include "gdkintl.h"
 #include "gdkmemorytextureprivate.h"
 #include "gdkpaintable.h"
 #include "gdksnapshot.h"
 
 #include <graphene.h>
+#include "loaders/gdkpngprivate.h"
+#include "loaders/gdktiffprivate.h"
+#include "loaders/gdkjpegprivate.h"
+
+G_DEFINE_QUARK (gdk-texture-error-quark, gdk_texture_error)
 
 /* HACK: So we don't need to include any (not-yet-created) GSK or GTK headers */
 void
@@ -108,20 +114,143 @@ gdk_texture_paintable_init (GdkPaintableInterface *iface)
   iface->get_intrinsic_height = gdk_texture_paintable_get_intrinsic_height;
 }
 
+static GVariant *
+gdk_texture_icon_serialize (GIcon *icon)
+{
+  GVariant *result;
+  GBytes *bytes;
+
+  bytes = gdk_texture_save_to_png_bytes (GDK_TEXTURE (icon));
+  result = g_variant_new_from_bytes (G_VARIANT_TYPE_BYTESTRING, bytes, TRUE);
+  g_bytes_unref (bytes);
+
+  return g_variant_new ("(sv)", "bytes", result);
+}
+
+static void
+gdk_texture_icon_init (GIconIface *iface)
+{
+  iface->hash = (guint (*) (GIcon *)) g_direct_hash;
+  iface->equal = (gboolean (*) (GIcon *, GIcon *)) g_direct_equal;
+  iface->serialize = gdk_texture_icon_serialize;
+}
+
+static GInputStream *
+gdk_texture_loadable_icon_load (GLoadableIcon  *icon,
+                                int             size,
+                                char          **type,
+                                GCancellable   *cancellable,
+                                GError        **error)
+{
+  GInputStream *stream;
+  GBytes *bytes;
+
+  bytes = gdk_texture_save_to_png_bytes (GDK_TEXTURE (icon));
+  stream = g_memory_input_stream_new_from_bytes (bytes);
+  g_bytes_unref (bytes);
+
+  if (type)
+    *type = NULL;
+
+  return stream;
+}
+
+static void
+gdk_texture_loadable_icon_load_in_thread (GTask        *task,
+                                          gpointer      source_object,
+                                          gpointer      task_data,
+                                          GCancellable *cancellable)
+{
+  GInputStream *stream;
+  GBytes *bytes;
+
+  bytes = gdk_texture_save_to_png_bytes (source_object);
+  stream = g_memory_input_stream_new_from_bytes (bytes);
+  g_bytes_unref (bytes);
+  g_task_return_pointer (task, stream, g_object_unref);
+}
+
+static void
+gdk_texture_loadable_icon_load_async (GLoadableIcon       *icon,
+                                      int                  size,
+                                      GCancellable        *cancellable,
+                                      GAsyncReadyCallback  callback,
+                                      gpointer             user_data)
+{
+  GTask *task;
+
+  task = g_task_new (icon, cancellable, callback, user_data);
+  g_task_run_in_thread (task, gdk_texture_loadable_icon_load_in_thread);
+  g_object_unref (task);
+}
+
+static GInputStream *
+gdk_texture_loadable_icon_load_finish (GLoadableIcon  *icon,
+                                       GAsyncResult   *res,
+                                       char          **type,
+                                       GError        **error)
+{
+  GInputStream *result;
+
+  g_return_val_if_fail (g_task_is_valid (res, icon), NULL);
+
+  result = g_task_propagate_pointer (G_TASK (res), error);
+  if (result == NULL)
+    return NULL;
+
+  if (type)
+    *type = NULL;
+
+  return result;
+}
+
+static void
+gdk_texture_loadable_icon_init (GLoadableIconIface *iface)
+{
+  iface->load = gdk_texture_loadable_icon_load;
+  iface->load_async = gdk_texture_loadable_icon_load_async;
+  iface->load_finish = gdk_texture_loadable_icon_load_finish;
+}
+
 G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GdkTexture, gdk_texture, G_TYPE_OBJECT,
                                   G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
-                                                         gdk_texture_paintable_init))
+                                                         gdk_texture_paintable_init)
+                                  G_IMPLEMENT_INTERFACE (G_TYPE_ICON,
+                                                         gdk_texture_icon_init)
+                                  G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON, gdk_texture_loadable_icon_init))
 
 #define GDK_TEXTURE_WARN_NOT_IMPLEMENTED_METHOD(obj,method) \
   g_critical ("Texture of type '%s' does not implement GdkTexture::" # method, G_OBJECT_TYPE_NAME (obj))
 
-static void
-gdk_texture_real_download (GdkTexture         *self,
-                           const GdkRectangle *area,
-                           guchar             *data,
-                           gsize               stride)
+static GdkTexture *
+gdk_texture_real_download_texture (GdkTexture *self)
 {
-  GDK_TEXTURE_WARN_NOT_IMPLEMENTED_METHOD (self, download);
+  GDK_TEXTURE_WARN_NOT_IMPLEMENTED_METHOD (self, download_texture);
+  return NULL;
+}
+
+static void
+gdk_texture_real_download (GdkTexture *texture,
+                           guchar     *data,
+                           gsize      stride)
+{
+  GdkTexture *memory_texture;
+
+  memory_texture = gdk_texture_download_texture (texture);
+  gdk_texture_download (memory_texture, data, stride);
+  g_object_unref (memory_texture);
+}
+
+static void
+gdk_texture_real_download_float (GdkTexture *self,
+                                 float      *data,
+                                 gsize       stride)
+{
+  GdkTexture *memory_texture;
+
+  memory_texture = gdk_texture_download_texture (self);
+  gdk_texture_download_float (memory_texture, data, stride);
+  g_object_unref (memory_texture);
 }
 
 static void
@@ -187,7 +316,9 @@ gdk_texture_class_init (GdkTextureClass *klass)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 
+  klass->download_texture = gdk_texture_real_download_texture;
   klass->download = gdk_texture_real_download;
+  klass->download_float = gdk_texture_real_download_float;
 
   gobject_class->set_property = gdk_texture_set_property;
   gobject_class->get_property = gdk_texture_get_property;
@@ -263,7 +394,7 @@ gdk_texture_new_for_surface (cairo_surface_t *surface)
   
   texture = gdk_memory_texture_new (cairo_image_surface_get_width (surface),
                                     cairo_image_surface_get_height (surface),
-                                    GDK_MEMORY_CAIRO_FORMAT_ARGB32,
+                                    GDK_MEMORY_DEFAULT,
                                     bytes,
                                     cairo_image_surface_get_stride (surface));
 
@@ -325,18 +456,23 @@ gdk_texture_new_for_pixbuf (GdkPixbuf *pixbuf)
 GdkTexture *
 gdk_texture_new_from_resource (const char *resource_path)
 {
-  GError *error = NULL;
+  GBytes *bytes;
   GdkTexture *texture;
-  GdkPixbuf *pixbuf;
+  GError *error = NULL;
 
   g_return_val_if_fail (resource_path != NULL, NULL);
 
-  pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
-  if (pixbuf == NULL)
-    g_error ("Resource path %s is not a valid image: %s", resource_path, error->message);
+  bytes = g_resources_lookup_data (resource_path, 0, &error);
+  if (bytes != NULL)
+    {
+      texture = gdk_texture_new_from_bytes (bytes, &error);
+      g_bytes_unref (bytes);
+    }
+  else
+    texture = NULL;
 
-  texture = gdk_texture_new_for_pixbuf (pixbuf);
-  g_object_unref (pixbuf);
+  if (texture == NULL)
+    g_error ("Resource path %s s not a valid image: %s", resource_path, error->message);
 
   return texture;
 }
@@ -359,17 +495,65 @@ GdkTexture *
 gdk_texture_new_from_file (GFile   *file,
                            GError **error)
 {
+  GBytes *bytes;
   GdkTexture *texture;
-  GdkPixbuf *pixbuf;
-  GInputStream *stream;
 
   g_return_val_if_fail (G_IS_FILE (file), NULL);
   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 
-  stream = G_INPUT_STREAM (g_file_read (file, NULL, error));
-  if (stream == NULL)
+  bytes = g_file_load_bytes (file, NULL, NULL, error);
+  if (bytes == NULL)
     return NULL;
 
+  texture = gdk_texture_new_from_bytes (bytes, error);
+
+  g_bytes_unref (bytes);
+
+  return texture;
+}
+
+gboolean
+gdk_texture_can_load (GBytes *bytes)
+{
+  return gdk_is_png (bytes) ||
+         gdk_is_jpeg (bytes) ||
+         gdk_is_tiff (bytes);
+}
+
+static GdkTexture *
+gdk_texture_new_from_bytes_internal (GBytes  *bytes,
+                                     GError **error)
+{
+  if (gdk_is_png (bytes))
+    {
+      return gdk_load_png (bytes, error);
+    }
+  else if (gdk_is_jpeg (bytes))
+    {
+      return gdk_load_jpeg (bytes, error);
+    }
+  else if (gdk_is_tiff (bytes))
+    {
+      return gdk_load_tiff (bytes, error);
+    }
+  else
+    {
+      g_set_error_literal (error,
+                           GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_UNSUPPORTED_FORMAT,
+                           _("Unknown image format."));
+      return NULL;
+    }
+}
+
+static GdkTexture *
+gdk_texture_new_from_bytes_pixbuf (GBytes  *bytes,
+                                   GError **error)
+{
+  GInputStream *stream;
+  GdkPixbuf *pixbuf;
+  GdkTexture *texture;
+
+  stream = g_memory_input_stream_new_from_bytes (bytes);
   pixbuf = gdk_pixbuf_new_from_stream (stream, NULL, error);
   g_object_unref (stream);
   if (pixbuf == NULL)
@@ -381,6 +565,82 @@ gdk_texture_new_from_file (GFile   *file,
   return texture;
 }
 
+
+/**
+ * gdk_texture_new_from_bytes:
+ * @bytes: a `GBytes` containing the data to load
+ * @error: Return location for an error
+ *
+ * Creates a new texture by loading an image from memory,
+ *
+ * The file format is detected automatically. The supported formats
+ * are PNG and JPEG, though more formats might be available.
+ *
+ * If %NULL is returned, then @error will be set.
+ *
+ * Return value: A newly-created `GdkTexture`
+ *
+ * Since: 4.6
+ */
+GdkTexture *
+gdk_texture_new_from_bytes (GBytes  *bytes,
+                            GError **error)
+{
+  GdkTexture *texture;
+  GError *internal_error = NULL;
+
+  g_return_val_if_fail (bytes != NULL, NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  texture = gdk_texture_new_from_bytes_internal (bytes, &internal_error);
+  if (texture)
+    return texture;
+
+  if (!g_error_matches (internal_error, GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_UNSUPPORTED_CONTENT) &&
+      !g_error_matches (internal_error, GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_UNSUPPORTED_FORMAT))
+    {
+      g_propagate_error (error, internal_error);
+      return NULL;
+    }
+
+  g_clear_error (&internal_error);
+
+  return gdk_texture_new_from_bytes_pixbuf (bytes, error);
+}
+
+/**
+ * gdk_texture_new_from_filename:
+ * @path: (type filename): the filename to load
+ * @error: Return location for an error
+ *
+ * Creates a new texture by loading an image from a file.
+ *
+ * The file format is detected automatically. The supported formats
+ * are PNG and JPEG, though more formats might be available.
+ *
+ * If %NULL is returned, then @error will be set.
+ *
+ * Return value: A newly-created `GdkTexture`
+ */
+GdkTexture *
+gdk_texture_new_from_filename (const char  *path,
+                               GError     **error)
+{
+  GdkTexture *texture;
+  GFile *file;
+
+  g_return_val_if_fail (path, NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  file = g_file_new_for_path (path);
+
+  texture = gdk_texture_new_from_file (file, error);
+
+  g_object_unref (file);
+
+  return texture;
+}
+
 /**
  * gdk_texture_get_width: (attributes org.gtk.Method.get_property=width)
  * @texture: a `GdkTexture`
@@ -435,20 +695,6 @@ gdk_texture_download_surface (GdkTexture *texture)
   return surface;
 }
 
-void
-gdk_texture_download_area (GdkTexture         *texture,
-                           const GdkRectangle *area,
-                           guchar             *data,
-                           gsize               stride)
-{
-  g_assert (area->x >= 0);
-  g_assert (area->y >= 0);
-  g_assert (area->x + area->width <= texture->width);
-  g_assert (area->y + area->height <= texture->height);
-
-  GDK_TEXTURE_GET_CLASS (texture)->download (texture, area, data, stride);
-}
-
 /**
  * gdk_texture_download:
  * @texture: a `GdkTexture`
@@ -485,10 +731,62 @@ gdk_texture_download (GdkTexture *texture,
   g_return_if_fail (data != NULL);
   g_return_if_fail (stride >= gdk_texture_get_width (texture) * 4);
 
-  gdk_texture_download_area (texture,
-                             &(GdkRectangle) { 0, 0, texture->width, texture->height },
-                             data,
-                             stride);
+  GDK_TEXTURE_GET_CLASS (texture)->download (texture, data, stride);
+}
+
+/**
+ * gdk_texture_download_float:
+ * @texture: a `GdkTexture`
+ * @data: (array): pointer to enough memory to be filled with the
+ *   downloaded data of @texture
+ * @stride: rowstride in elements, will usually be equal to
+ *   gdk_texture_get_width() * 4
+ *
+ * Downloads the @texture into local memory in a high dynamic range format.
+ *
+ * This may be an expensive operation, as the actual texture data
+ * may reside on a GPU or on a remote display server and because the data
+ * may need to be upsampled if it was not already available in this
+ * format.
+ *
+ * You may want to use [method@Gdk.Texture.download] instead if you don't
+ * need high dynamic range support.
+ *
+ * The data format of the downloaded data is equivalent to
+ * GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED, so every downloaded
+ * pixel requires 16 bytes of memory.
+ *
+ * Note that the caller is responsible to provide sufficiently
+ * aligned memory to access the resulting data directly as floats.
+ *
+ * Since: 4.6
+ */
+void
+gdk_texture_download_float (GdkTexture *texture,
+                            float      *data,
+                            gsize       stride)
+{
+  g_return_if_fail (GDK_IS_TEXTURE (texture));
+  g_return_if_fail (data != NULL);
+  g_return_if_fail (stride >= gdk_texture_get_width (texture) * 4);
+
+  GDK_TEXTURE_GET_CLASS (texture)->download_float (texture, data, stride);
+}
+
+GdkTexture *
+gdk_texture_download_texture (GdkTexture *texture)
+{
+  g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL);
+
+  g_object_ref (texture);
+  while (!GDK_IS_MEMORY_TEXTURE (texture))
+    {
+      GdkTexture *downloaded = GDK_TEXTURE_GET_CLASS (texture)->download_texture (texture);
+      g_object_unref (texture);
+      texture = downloaded;
+    }
+
+  return texture;
 }
 
 gboolean
@@ -540,7 +838,8 @@ gdk_texture_get_render_data (GdkTexture  *self,
  * This is a utility function intended for debugging and testing.
  * If you want more control over formats, proper error handling or
  * want to store to a `GFile` or other location, you might want to
- * look into using the gdk-pixbuf library.
+ * use [method@Gdk.Texture.save_to_png_bytes] or look into the
+ * gdk-pixbuf library.
  *
  * Returns: %TRUE if saving succeeded, %FALSE on failure.
  */
@@ -548,30 +847,110 @@ gboolean
 gdk_texture_save_to_png (GdkTexture *texture,
                          const char *filename)
 {
-  cairo_surface_t *surface;
-  cairo_status_t status;
+  GBytes *bytes;
   gboolean result;
 
   g_return_val_if_fail (GDK_IS_TEXTURE (texture), FALSE);
   g_return_val_if_fail (filename != NULL, FALSE);
 
-  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
-                                        gdk_texture_get_width (texture),
-                                        gdk_texture_get_height (texture));
-  gdk_texture_download (texture,
-                        cairo_image_surface_get_data (surface),
-                        cairo_image_surface_get_stride (surface));
-  cairo_surface_mark_dirty (surface);
-
-  status = cairo_surface_write_to_png (surface, filename);
-
-  if (status != CAIRO_STATUS_SUCCESS ||
-      cairo_surface_status (surface) != CAIRO_STATUS_SUCCESS)
-    result = FALSE;
-  else
-    result = TRUE;
-
-  cairo_surface_destroy (surface);
+  bytes = gdk_save_png (texture);
+  result = g_file_set_contents (filename,
+                                g_bytes_get_data (bytes, NULL),
+                                g_bytes_get_size (bytes),
+                                NULL);
+  g_bytes_unref (bytes);
 
   return result;
 }
+
+/**
+ * gdk_texture_save_to_png_bytes:
+ * @texture: a `GdkTexture`
+ *
+ * Store the given @texture in memory as a PNG file.
+ * Use [ctor@Gdk.Texture.new_from_bytes] to read it back.
+ *
+ * If you want to serialize a texture, this is a convenient and
+ * portable way to do that.
+ *
+ * If you need more control over the generated image, such as
+ * attaching metadata, you should look into an image handling
+ * library such as the gdk-pixbuf library.
+ *
+ * If you are dealing with high dynamic range float data, you
+ * might also want to consider [method@Gdk.Texture.save_to_tiff_bytes]
+ * instead.
+ *
+ * Returns: a newly allocated `GBytes` containing PNG data
+ *
+ * Since: 4.6
+ */
+GBytes *
+gdk_texture_save_to_png_bytes (GdkTexture *texture)
+{
+  g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL);
+
+  return gdk_save_png (texture);
+}
+
+/**
+ * gdk_texture_save_to_tiff:
+ * @texture: a `GdkTexture`
+ * @filename: (type filename): the filename to store to
+ *
+ * Store the given @texture to the @filename as a TIFF file.
+ *
+ * GTK will attempt to store data without loss.
+ * Returns: %TRUE if saving succeeded, %FALSE on failure.
+ *
+ * Since: 4.6
+ */
+gboolean
+gdk_texture_save_to_tiff (GdkTexture  *texture,
+                          const char  *filename)
+{
+  GBytes *bytes;
+  gboolean result;
+
+  g_return_val_if_fail (GDK_IS_TEXTURE (texture), FALSE);
+  g_return_val_if_fail (filename != NULL, FALSE);
+
+  bytes = gdk_save_tiff (texture);
+  result = g_file_set_contents (filename,
+                                g_bytes_get_data (bytes, NULL),
+                                g_bytes_get_size (bytes),
+                                NULL);
+  g_bytes_unref (bytes);
+
+  return result;
+}
+
+/**
+ * gdk_texture_save_to_tiff_bytes:
+ * @texture: a `GdkTexture`
+ *
+ * Store the given @texture in memory as a TIFF file.
+ *
+ * Use [ctor@Gdk.Texture.new_from_bytes] to read it back.
+ *
+ * This function is intended to store a representation of the
+ * texture's data that is as accurate as possible. This is
+ * particularly relevant when working with high dynamic range
+ * images and floating-point texture data.
+ *
+ * If that is not your concern and you are interested in a
+ * smaller size and a more portable format, you might want to
+ * use [method@Gdk.Texture.save_to_png_bytes].
+ *
+ * Returns: a newly allocated `GBytes` containing TIFF data
+ *
+ * Since: 4.6
+ */
+GBytes *
+gdk_texture_save_to_tiff_bytes (GdkTexture *texture)
+{
+  g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL);
+
+  return gdk_save_tiff (texture);
+}
+

gdk/gdktexture.h

@@ -38,6 +38,30 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(GdkTexture, g_object_unref)
 
 typedef struct _GdkTextureClass        GdkTextureClass;
 
+#define GDK_TEXTURE_ERROR       (gdk_texture_error_quark ())
+
+GDK_AVAILABLE_IN_4_6
+GQuark gdk_texture_error_quark (void);
+
+/**
+ * GdkTextureError:
+ * @GDK_TEXTURE_ERROR_TOO_LARGE: Not enough memory to handle this image
+ * @GDK_TEXTURE_ERROR_CORRUPT_IMAGE: The image data appears corrupted
+ * @GDK_TEXTURE_ERROR_UNSUPPORTED_CONTENT: The image contains features
+ *   that cannot be loaded
+ * @GDK_TEXTURE_ERROR_UNSUPPORTED_FORMAT: The image format is not supported
+ *
+ * Possible errors that can be returned by `GdkTexture` constructors.
+ *
+ * Since: 4.6
+ */
+typedef enum
+{
+  GDK_TEXTURE_ERROR_TOO_LARGE,
+  GDK_TEXTURE_ERROR_CORRUPT_IMAGE,
+  GDK_TEXTURE_ERROR_UNSUPPORTED_CONTENT,
+  GDK_TEXTURE_ERROR_UNSUPPORTED_FORMAT,
+} GdkTextureError;
 
 GDK_AVAILABLE_IN_ALL
 GType                   gdk_texture_get_type                   (void) G_GNUC_CONST;
@@ -49,6 +73,12 @@ GdkTexture *            gdk_texture_new_from_resource          (const char
 GDK_AVAILABLE_IN_ALL
 GdkTexture *            gdk_texture_new_from_file              (GFile           *file,
                                                                 GError         **error);
+GDK_AVAILABLE_IN_4_6
+GdkTexture *            gdk_texture_new_from_filename          (const char      *path,
+                                                                GError         **error);
+GDK_AVAILABLE_IN_4_6
+GdkTexture *            gdk_texture_new_from_bytes             (GBytes          *bytes,
+                                                                GError         **error);
 
 GDK_AVAILABLE_IN_ALL
 int                     gdk_texture_get_width                  (GdkTexture      *texture) G_GNUC_PURE;
@@ -59,9 +89,20 @@ GDK_AVAILABLE_IN_ALL
 void                    gdk_texture_download                   (GdkTexture      *texture,
                                                                 guchar          *data,
                                                                 gsize            stride);
+GDK_AVAILABLE_IN_4_6
+void                    gdk_texture_download_float             (GdkTexture      *texture,
+                                                                float           *data,
+                                                                gsize            stride);
 GDK_AVAILABLE_IN_ALL
 gboolean                gdk_texture_save_to_png                (GdkTexture      *texture,
                                                                 const char      *filename);
+GDK_AVAILABLE_IN_4_6
+GBytes *                gdk_texture_save_to_png_bytes          (GdkTexture      *texture);
+GDK_AVAILABLE_IN_4_6
+gboolean                gdk_texture_save_to_tiff               (GdkTexture      *texture,
+                                                                const char      *filename);
+GDK_AVAILABLE_IN_4_6
+GBytes *                gdk_texture_save_to_tiff_bytes         (GdkTexture      *texture);
 
 G_END_DECLS
 

gdk/gdktextureprivate.h

@@ -24,21 +24,23 @@ struct _GdkTexture
 struct _GdkTextureClass {
   GObjectClass parent_class;
 
+  /* mandatory: Download into a GdkMemoryTexture */
+  GdkTexture *          (* download_texture)            (GdkTexture             *texture);
+  /* optional */
   void                  (* download)                    (GdkTexture             *texture,
-                                                         const GdkRectangle     *area,
                                                          guchar                 *data,
                                                          gsize                   stride);
+  void                  (* download_float)              (GdkTexture             *texture,
+                                                         float                  *data,
+                                                         gsize                   stride);
 };
 
-gpointer                gdk_texture_new                 (const GdkTextureClass  *klass,
-                                                         int                     width,
-                                                         int                     height);
+gboolean                gdk_texture_can_load            (GBytes                 *bytes);
+
 GdkTexture *            gdk_texture_new_for_surface     (cairo_surface_t        *surface);
 cairo_surface_t *       gdk_texture_download_surface    (GdkTexture             *texture);
-void                    gdk_texture_download_area       (GdkTexture             *texture,
-                                                         const GdkRectangle     *area,
-                                                         guchar                 *data,
-                                                         gsize                   stride);
+/* NB: GdkMemoryTexture */
+GdkTexture *            gdk_texture_download_texture    (GdkTexture             *texture);
 
 gboolean                gdk_texture_set_render_data     (GdkTexture             *self,
                                                          gpointer                key,

gdk/gdktoplevel.c

@@ -78,6 +78,13 @@ gdk_toplevel_default_show_window_menu (GdkToplevel *toplevel,
   return FALSE;
 }
 
+static gboolean
+gdk_toplevel_default_titlebar_gesture (GdkToplevel        *toplevel,
+                                       GdkTitlebarGesture  gesture)
+{
+  return FALSE;
+}
+
 static gboolean
 gdk_toplevel_default_supports_edge_constraints (GdkToplevel *toplevel)
 {
@@ -114,6 +121,7 @@ gdk_toplevel_default_init (GdkToplevelInterface *iface)
   iface->supports_edge_constraints = gdk_toplevel_default_supports_edge_constraints;
   iface->inhibit_system_shortcuts = gdk_toplevel_default_inhibit_system_shortcuts;
   iface->restore_system_shortcuts = gdk_toplevel_default_restore_system_shortcuts;
+  iface->titlebar_gesture = gdk_toplevel_default_titlebar_gesture;
 
   /**
    * GdkToplevel:state: (attributes org.gtk.Property.get=gdk_toplevel_get_state)
@@ -716,3 +724,13 @@ gdk_toplevel_begin_move (GdkToplevel *toplevel,
                                                  x, y,
                                                  timestamp);
 }
+
+gboolean
+gdk_toplevel_titlebar_gesture (GdkToplevel        *toplevel,
+                               GdkTitlebarGesture  gesture)
+{
+  g_return_val_if_fail (GDK_IS_TOPLEVEL (toplevel), FALSE);
+
+  return GDK_TOPLEVEL_GET_IFACE (toplevel)->titlebar_gesture (toplevel,
+                                                              gesture);
+}

gdk/gdktoplevel.h

@@ -115,6 +115,13 @@ typedef enum
   GDK_TOPLEVEL_STATE_LEFT_RESIZABLE   = 1 << 15
 } GdkToplevelState;
 
+typedef enum
+{
+  GDK_TITLEBAR_GESTURE_DOUBLE_CLICK   = 1,
+  GDK_TITLEBAR_GESTURE_RIGHT_CLICK    = 2,
+  GDK_TITLEBAR_GESTURE_MIDDLE_CLICK   = 3
+} GdkTitlebarGesture;
+
 
 #define GDK_TYPE_TOPLEVEL (gdk_toplevel_get_type ())
 
@@ -196,6 +203,10 @@ void          gdk_toplevel_begin_move                (GdkToplevel    *toplevel,
                                                       double          y,
                                                       guint32         timestamp);
 
+GDK_AVAILABLE_IN_4_4
+gboolean      gdk_toplevel_titlebar_gesture          (GdkToplevel        *toplevel,
+                                                      GdkTitlebarGesture  gesture);
+
 G_END_DECLS
 
 #endif /* __GDK_TOPLEVEL_H__ */

gdk/gdktoplevelprivate.h

@@ -38,6 +38,8 @@ struct _GdkToplevelInterface
                                          double             x,
                                          double             y,
                                          guint32            timestamp);
+  gboolean      (* titlebar_gesture)    (GdkToplevel       *toplevel,
+                                         GdkTitlebarGesture gesture);
 };
 
 typedef enum

gdk/gdkversionmacros.h.in

@@ -94,6 +94,14 @@
  */
 #define GDK_VERSION_4_4        (G_ENCODE_VERSION (4, 4))
 
+/**
+ * GDK_VERSION_4_6:
+ *
+ * A macro that evaluates to the 4.6 version of GDK, in a format
+ * that can be used by the C pre-processor.
+ */
+#define GDK_VERSION_4_6        (G_ENCODE_VERSION (4, 6))
+
 
 /* evaluates to the current stable version; for development cycles,
  * this means the next stable target, with a hard backstop to the
@@ -221,4 +229,18 @@
 # define GDK_DEPRECATED_IN_4_4_FOR(f)           _GDK_EXTERN
 #endif
 
+#if GDK_VERSION_MAX_ALLOWED < GDK_VERSION_4_6
+# define GDK_AVAILABLE_IN_4_6                   GDK_UNAVAILABLE(4, 6)
+#else
+# define GDK_AVAILABLE_IN_4_6                   _GDK_EXTERN
+#endif
+
+#if GDK_VERSION_MIN_REQUIRED >= GDK_VERSION_4_6
+# define GDK_DEPRECATED_IN_4_6                  GDK_DEPRECATED
+# define GDK_DEPRECATED_IN_4_6_FOR(f)           GDK_DEPRECATED_FOR(f)
+#else
+# define GDK_DEPRECATED_IN_4_6                  _GDK_EXTERN
+# define GDK_DEPRECATED_IN_4_6_FOR(f)           _GDK_EXTERN
+#endif
+
 #endif  /* __GDK_VERSION_MACROS_H__ */

gdk/gdkvulkancontext.c

@@ -117,104 +117,104 @@ gdk_vulkan_strerror (VkResult result)
   switch (result)
   {
     case VK_SUCCESS:
-      return "Command successfully completed.";
+      return "Command successfully completed. (VK_SUCCESS)";
     case VK_NOT_READY:
-      return "A fence or query has not yet completed.";
+      return "A fence or query has not yet completed. (VK_NOT_READY)";
     case VK_TIMEOUT:
-      return "A wait operation has not completed in the specified time.";
+      return "A wait operation has not completed in the specified time. (VK_TIMEOUT)";
     case VK_EVENT_SET:
-      return "An event is signaled.";
+      return "An event is signaled. (VK_EVENT_SET)";
     case VK_EVENT_RESET:
-      return "An event is unsignaled.";
+      return "An event is unsignaled. (VK_EVENT_RESET)";
     case VK_INCOMPLETE:
-      return "A return array was too small for the result.";
+      return "A return array was too small for the result. (VK_INCOMPLETE)";
     case VK_SUBOPTIMAL_KHR:
-      return "A swapchain no longer matches the surface properties exactly, but can still be used to present to the surface successfully.";
+      return "A swapchain no longer matches the surface properties exactly, but can still be used to present to the surface successfully. (VK_SUBOPTIMAL_KHR)";
     case VK_ERROR_OUT_OF_HOST_MEMORY:
-      return "A host memory allocation has failed.";
+      return "A host memory allocation has failed. (VK_ERROR_OUT_OF_HOST_MEMORY)";
     case VK_ERROR_OUT_OF_DEVICE_MEMORY:
-      return "A device memory allocation has failed.";
+      return "A device memory allocation has failed. (VK_ERROR_OUT_OF_DEVICE_MEMORY)";
     case VK_ERROR_INITIALIZATION_FAILED:
-      return "Initialization of an object could not be completed for implementation-specific reasons.";
+      return "Initialization of an object could not be completed for implementation-specific reasons. (VK_ERROR_INITIALIZATION_FAILED)";
     case VK_ERROR_DEVICE_LOST:
-      return "The logical or physical device has been lost.";
+      return "The logical or physical device has been lost. (VK_ERROR_DEVICE_LOST)";
     case VK_ERROR_MEMORY_MAP_FAILED:
-      return "Mapping of a memory object has failed.";
+      return "Mapping of a memory object has failed. (VK_ERROR_MEMORY_MAP_FAILED)";
     case VK_ERROR_LAYER_NOT_PRESENT:
-      return "A requested layer is not present or could not be loaded.";
+      return "A requested layer is not present or could not be loaded. (VK_ERROR_LAYER_NOT_PRESENT)";
     case VK_ERROR_EXTENSION_NOT_PRESENT:
-      return "A requested extension is not supported.";
+      return "A requested extension is not supported. (VK_ERROR_EXTENSION_NOT_PRESENT)";
     case VK_ERROR_FEATURE_NOT_PRESENT:
-      return "A requested feature is not supported.";
+      return "A requested feature is not supported. (VK_ERROR_FEATURE_NOT_PRESENT)";
     case VK_ERROR_INCOMPATIBLE_DRIVER:
-      return "The requested version of Vulkan is not supported by the driver or is otherwise incompatible for implementation-specific reasons.";
+      return "The requested version of Vulkan is not supported by the driver or is otherwise incompatible for implementation-specific reasons. (VK_ERROR_INCOMPATIBLE_DRIVER)";
     case VK_ERROR_TOO_MANY_OBJECTS:
-      return "Too many objects of the type have already been created.";
+      return "Too many objects of the type have already been created. (VK_ERROR_TOO_MANY_OBJECTS)";
     case VK_ERROR_FORMAT_NOT_SUPPORTED:
-      return "A requested format is not supported on this device.";
+      return "A requested format is not supported on this device. (VK_ERROR_FORMAT_NOT_SUPPORTED)";
 #if VK_HEADER_VERSION >= 24
     case VK_ERROR_FRAGMENTED_POOL:
-      return "A requested pool allocation has failed due to fragmentation of the pool’s memory.";
+      return "A requested pool allocation has failed due to fragmentation of the pool’s memory. (VK_ERROR_FRAGMENTED_POOL)";
 #endif
     case VK_ERROR_SURFACE_LOST_KHR:
-      return "A surface is no longer available.";
+      return "A surface is no longer available. (VK_ERROR_SURFACE_LOST_KHR)";
     case VK_ERROR_NATIVE_WINDOW_IN_USE_KHR:
-      return "The requested window is already in use by Vulkan or another API in a manner which prevents it from being used again.";
+      return "The requested window is already in use by Vulkan or another API in a manner which prevents it from being used again. (VK_ERROR_NATIVE_WINDOW_IN_USE_KHR)";
     case VK_ERROR_OUT_OF_DATE_KHR:
-      return "A surface has changed in such a way that it is no longer compatible with the swapchain.";
+      return "A surface has changed in such a way that it is no longer compatible with the swapchain. (VK_ERROR_OUT_OF_DATE_KHR)";
     case VK_ERROR_INCOMPATIBLE_DISPLAY_KHR:
-      return "The display used by a swapchain does not use the same presentable image layout, or is incompatible in a way that prevents sharing an image.";
+      return "The display used by a swapchain does not use the same presentable image layout, or is incompatible in a way that prevents sharing an image. (VK_ERROR_INCOMPATIBLE_DISPLAY_KHR)";
     case VK_ERROR_VALIDATION_FAILED_EXT:
-      return "The application caused the validation layer to fail.";
+      return "The application caused the validation layer to fail. (VK_ERROR_VALIDATION_FAILED_EXT)";
     case VK_ERROR_INVALID_SHADER_NV:
-      return "One or more shaders failed to compile or link.";
+      return "One or more shaders failed to compile or link. (VK_ERROR_INVALID_SHADER_NV)";
 #if VK_HEADER_VERSION >= 39
     case VK_ERROR_OUT_OF_POOL_MEMORY_KHR:
-      return "A pool memory allocation has failed.";
+      return "A pool memory allocation has failed. (VK_ERROR_OUT_OF_POOL_MEMORY_KHR)";
 #endif
 #if VK_HEADER_VERSION >= 54
     case VK_ERROR_INVALID_EXTERNAL_HANDLE_KHR:
-      return "An external handle is not a valid handle of the specified type.";
+      return "An external handle is not a valid handle of the specified type. (VK_ERROR_INVALID_EXTERNAL_HANDLE_KHR)";
 #endif
 #if VK_HEADER_VERSION >= 64
     case VK_ERROR_NOT_PERMITTED_EXT:
-      return "The caller does not have sufficient privileges.";
+      return "The caller does not have sufficient privileges. (VK_ERROR_NOT_PERMITTED_EXT)";
 #endif
 #if VK_HEADER_VERSION >= 72
     case VK_ERROR_FRAGMENTATION_EXT:
-      return "A descriptor pool creation has failed due to fragmentation";
+      return "A descriptor pool creation has failed due to fragmentation. (VK_ERROR_FRAGMENTATION_EXT)";
 #endif
 #if VK_HEADER_VERSION >= 89
     case VK_ERROR_INVALID_DRM_FORMAT_MODIFIER_PLANE_LAYOUT_EXT:
-      return "Invalid DRM format modifier plane layout";
+      return "Invalid DRM format modifier plane layout (VK_ERROR_INVALID_DRM_FORMAT_MODIFIER_PLANE_LAYOUT_EXT)";
 #endif
 #if VK_HEADER_VERSION >= 97
     case VK_ERROR_INVALID_DEVICE_ADDRESS_EXT:
-      return "Invalid device address";
+      return "Invalid device address (VK_ERROR_INVALID_DEVICE_ADDRESS_EXT)";
 #endif
 #if VK_HEADER_VERSION >= 105
     case VK_ERROR_FULL_SCREEN_EXCLUSIVE_MODE_LOST_EXT:
-      return "An operation on a swapchain created with VK_FULL_SCREEN_EXCLUSIVE_APPLICATION_CONTROLLED_EXT failed as it did not have exclusive full-screen access.";
+      return "An operation on a swapchain created with VK_FULL_SCREEN_EXCLUSIVE_APPLICATION_CONTROLLED_EXT failed as it did not have exclusive full-screen access. (VK_ERROR_FULL_SCREEN_EXCLUSIVE_MODE_LOST_EXT)";
 #endif
 #if VK_HEADER_VERSION >= 131
     case VK_ERROR_UNKNOWN:
-      return "An unknown error has occurred; either the application has provided invalid input, or an implementation failure has occurred.";
+      return "An unknown error has occurred; either the application has provided invalid input, or an implementation failure has occurred. (VK_ERROR_UNKNOWN)";
 #endif
 #if VK_HEADER_VERSION >= 135
 #if VK_HEADER_VERSION < 162
     case VK_ERROR_INCOMPATIBLE_VERSION_KHR:
-      return "This error was removed by the Vulkan gods.";
+      return "This error was removed by the Vulkan gods. (VK_ERROR_INCOMPATIBLE_VERSION_KHR)";
 #endif
     case VK_THREAD_IDLE_KHR:
-      return "A deferred operation is not complete but there is currently no work for this thread to do at the time of this call.";
+      return "A deferred operation is not complete but there is currently no work for this thread to do at the time of this call. (VK_THREAD_IDLE_KHR)";
     case VK_THREAD_DONE_KHR:
-      return "A deferred operation is not complete but there is no work remaining to assign to additional threads.";
+      return "A deferred operation is not complete but there is no work remaining to assign to additional threads. (VK_THREAD_DONE_KHR)";
     case VK_OPERATION_DEFERRED_KHR:
-      return "A deferred operation was requested and at least some of the work was deferred.";
+      return "A deferred operation was requested and at least some of the work was deferred. (VK_OPERATION_DEFERRED_KHR)";
     case VK_OPERATION_NOT_DEFERRED_KHR:
-      return "A deferred operation was requested and no operations were deferred.";
+      return "A deferred operation was requested and no operations were deferred. (VK_OPERATION_NOT_DEFERRED_KHR)";
     case VK_ERROR_PIPELINE_COMPILE_REQUIRED_EXT:
-      return "A requested pipeline creation would have required compilation, but the application requested compilation to not be performed.";
+      return "A requested pipeline creation would have required compilation, but the application requested compilation to not be performed. (VK_ERROR_PIPELINE_COMPILE_REQUIRED_EXT)";
 #endif
 #if VK_HEADER_VERSION < 140
     case VK_RESULT_RANGE_SIZE:

gdk/loaders/gdkjpeg.c

@@ -0,0 +1,334 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2021 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gdkjpegprivate.h"
+
+#include "gdkintl.h"
+#include "gdktexture.h"
+#include "gdkmemorytextureprivate.h"
+
+#include "gdkprofilerprivate.h"
+
+#include <jpeglib.h>
+#include <jerror.h>
+#include <setjmp.h>
+
+/* {{{ Error handling */
+
+/* No sigsetjmp on Windows */
+#ifndef HAVE_SIGSETJMP
+#define sigjmp_buf jmp_buf
+#define sigsetjmp(jb, x) setjmp(jb)
+#define siglongjmp longjmp
+#endif
+
+struct error_handler_data {
+        struct jpeg_error_mgr pub;
+        sigjmp_buf setjmp_buffer;
+        GError **error;
+};
+
+static void
+fatal_error_handler (j_common_ptr cinfo)
+{
+  struct error_handler_data *errmgr;
+  char buffer[JMSG_LENGTH_MAX];
+
+  errmgr = (struct error_handler_data *) cinfo->err;
+
+  cinfo->err->format_message (cinfo, buffer);
+
+  if (errmgr->error && *errmgr->error == NULL)
+    g_set_error (errmgr->error,
+                 GDK_TEXTURE_ERROR,
+                 GDK_TEXTURE_ERROR_CORRUPT_IMAGE,
+                 _("Error interpreting JPEG image file (%s)"), buffer);
+
+  siglongjmp (errmgr->setjmp_buffer, 1);
+
+  g_assert_not_reached ();
+}
+
+static void
+output_message_handler (j_common_ptr cinfo)
+{
+  /* do nothing */
+}
+
+/* }}} */
+/* {{{ Format conversion */
+
+static void
+convert_rgba_to_rgb (guchar *data,
+                     int     width,
+                     int     height,
+                     int     stride)
+{
+  gsize x, y;
+  guchar *src, *dest;
+
+  for (y = 0; y < height; y++)
+    {
+      src = data;
+      dest = data;
+
+      for (x = 0; x < width; x++)
+        {
+          guint32 pixel;
+
+          memcpy (&pixel, src, sizeof (guint32));
+
+          dest[0] = (pixel & 0x00ff0000) >> 16;
+          dest[1] = (pixel & 0x0000ff00) >>  8;
+          dest[2] = (pixel & 0x000000ff) >>  0;
+
+          dest += 3;
+          src += 4;
+        }
+
+      data += stride;
+    }
+}
+
+static void
+convert_grayscale_to_rgb (guchar *data,
+                          int     width,
+                          int     height,
+                          int     stride)
+{
+  gsize x, y;
+  guchar *dest, *src;
+
+  for (y = 0; y < height; y++)
+    {
+      src = data + width;
+      dest = data + 3 * width;
+      for (x = 0; x < width; x++)
+        {
+          dest -= 3;
+          src -= 1;
+          dest[0] = *src;
+          dest[1] = *src;
+          dest[2] = *src;
+        }
+      data += stride;
+    }
+}
+
+static void
+convert_cmyk_to_rgba (guchar *data,
+                      int     width,
+                      int     height,
+                      int     stride)
+{
+  gsize x, r;
+  guchar *dest;
+
+  for (r = 0; r < height; r++)
+    {
+      dest = data;
+      for (x = 0; x < width; x++)
+        {
+          int c, m, y, k;
+
+          c = dest[0];
+          m = dest[1];
+          y = dest[2];
+          k = dest[3];
+          dest[0] = k * c / 255;
+          dest[1] = k * m / 255;
+          dest[2] = k * y / 255;
+          dest[3] = 255;
+          dest += 4;
+        }
+      data += stride;
+    }
+}
+
+ /* }}} */
+/* {{{ Public API */
+
+GdkTexture *
+gdk_load_jpeg (GBytes  *input_bytes,
+               GError **error)
+{
+  struct jpeg_decompress_struct info;
+  struct error_handler_data jerr;
+  guint width, height, stride;
+  unsigned char *data;
+  unsigned char *row[1];
+  GBytes *bytes;
+  GdkTexture *texture;
+  GdkMemoryFormat format;
+  G_GNUC_UNUSED guint64 before = GDK_PROFILER_CURRENT_TIME;
+
+  info.err = jpeg_std_error (&jerr.pub);
+  jerr.pub.error_exit = fatal_error_handler;
+  jerr.pub.output_message = output_message_handler;
+  jerr.error = error;
+
+  if (sigsetjmp (jerr.setjmp_buffer, 1))
+    {
+      jpeg_destroy_decompress (&info);
+      return NULL;
+    }
+
+  jpeg_create_decompress (&info);
+
+  jpeg_mem_src (&info,
+                g_bytes_get_data (input_bytes, NULL),
+                g_bytes_get_size (input_bytes));
+
+  jpeg_read_header (&info, TRUE);
+  jpeg_start_decompress (&info);
+
+  width = info.output_width;
+  height = info.output_height;
+
+  switch ((int)info.out_color_space)
+    {
+    case JCS_GRAYSCALE:
+    case JCS_RGB:
+      stride = 3 * width;
+      data = g_try_malloc_n (stride, height);
+      format = GDK_MEMORY_R8G8B8;
+      break;
+    case JCS_CMYK:
+      stride = 4 * width;
+      data = g_try_malloc_n (stride, height);
+      format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
+      break;
+    default:
+      g_set_error (error,
+                   GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_UNSUPPORTED_CONTENT,
+                   _("Unsupported JPEG colorspace (%d)"), info.out_color_space);
+      jpeg_destroy_decompress (&info);
+      return NULL;
+    }
+
+  if (!data)
+    {
+      g_set_error (error,
+                   GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_TOO_LARGE,
+                   _("Not enough memory for image size %ux%u"), width, height);
+      jpeg_destroy_decompress (&info);
+      return NULL;
+    }
+
+  while (info.output_scanline < info.output_height)
+    {
+       row[0] = (unsigned char *)(&data[stride * info.output_scanline]);
+       jpeg_read_scanlines (&info, row, 1);
+    }
+
+  switch ((int)info.out_color_space)
+    {
+    case JCS_GRAYSCALE:
+      convert_grayscale_to_rgb (data, width, height, stride);
+      format = GDK_MEMORY_R8G8B8;
+      break;
+    case JCS_RGB:
+      break;
+    case JCS_CMYK:
+      convert_cmyk_to_rgba (data, width, height, stride);
+      break;
+    default:
+      g_assert_not_reached ();
+    }
+
+  jpeg_finish_decompress (&info);
+  jpeg_destroy_decompress (&info);
+
+  bytes = g_bytes_new_take (data, stride * height);
+
+  texture = gdk_memory_texture_new (width, height,
+                                    format,
+                                    bytes, stride);
+
+  g_bytes_unref (bytes);
+
+  gdk_profiler_end_mark (before, "jpeg load", NULL);
+ 
+  return texture;
+}
+
+GBytes *
+gdk_save_jpeg (GdkTexture *texture)
+{
+  struct jpeg_compress_struct info;
+  struct error_handler_data jerr;
+  struct jpeg_error_mgr err;
+  guchar *data = NULL;
+  gulong size = 0;
+  guchar *input = NULL;
+  guchar *row;
+  int width, height, stride;
+
+  width = gdk_texture_get_width (texture);
+  height = gdk_texture_get_height (texture);
+
+  info.err = jpeg_std_error (&jerr.pub);
+  jerr.pub.error_exit = fatal_error_handler;
+  jerr.pub.output_message = output_message_handler;
+  jerr.error = NULL;
+
+  if (sigsetjmp (jerr.setjmp_buffer, 1))
+    {
+      free (data);
+      g_free (input);
+      jpeg_destroy_compress (&info);
+      return NULL;
+    }
+
+  info.err = jpeg_std_error (&err);
+  jpeg_create_compress (&info);
+  info.image_width = width;
+  info.image_height = height;
+  info.input_components = 3;
+  info.in_color_space = JCS_RGB;
+
+  jpeg_set_defaults (&info);
+  jpeg_set_quality (&info, 75, TRUE);
+
+  jpeg_mem_dest (&info, &data, &size);
+
+  stride = width * 4;
+  input = g_malloc (stride * height);
+  gdk_texture_download (texture, input, stride);
+  convert_rgba_to_rgb (data, width, height, stride);
+
+  jpeg_start_compress (&info, TRUE);
+
+  while (info.next_scanline < info.image_height)
+    {
+      row = &input[info.next_scanline * stride];
+      jpeg_write_scanlines (&info, &row, 1);
+    }
+
+  jpeg_finish_compress (&info);
+
+  g_free (input);
+  jpeg_destroy_compress (&info);
+
+  return g_bytes_new_with_free_func (data, size, (GDestroyNotify) free, NULL);
+}
+
+/* }}} */
+
+/* vim:set foldmethod=marker expandtab: */

gdk/loaders/gdkjpegprivate.h

@@ -0,0 +1,43 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2021 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GDK_JPEG_PRIVATE_H__
+#define __GDK_JPEG_PRIVATE_H__
+
+#include "gdkmemorytexture.h"
+#include <gio/gio.h>
+
+#define JPEG_SIGNATURE "\xff\xd8"
+
+GdkTexture *gdk_load_jpeg         (GBytes           *bytes,
+                                   GError          **error);
+
+GBytes     *gdk_save_jpeg         (GdkTexture     *texture);
+
+static inline gboolean
+gdk_is_jpeg (GBytes *bytes)
+{
+  const char *data;
+  gsize size;
+
+  data = g_bytes_get_data (bytes, &size);
+
+  return size > strlen (JPEG_SIGNATURE) &&
+         memcmp (data, JPEG_SIGNATURE, strlen (JPEG_SIGNATURE)) == 0;
+}
+
+#endif

gdk/loaders/gdkpng.c

@@ -0,0 +1,577 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2021 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include "gdkpngprivate.h"
+
+#include "gdkintl.h"
+#include "gdkmemorytextureprivate.h"
+#include "gdkprofilerprivate.h"
+#include "gdktexture.h"
+#include "gdktextureprivate.h"
+#include "gsk/ngl/fp16private.h"
+#include <png.h>
+#include <stdio.h>
+
+/* The main difference between the png load/save code here and
+ * gdk-pixbuf is that we can support loading 16-bit data in the
+ * future, and we can extract gamma and colorspace information
+ * to produce linear, color-corrected data.
+ */
+
+/* {{{ Callbacks */
+
+/* No sigsetjmp on Windows */
+#ifndef HAVE_SIGSETJMP
+#define sigjmp_buf jmp_buf
+#define sigsetjmp(jb, x) setjmp(jb)
+#define siglongjmp longjmp
+#endif
+
+typedef struct
+{
+  guchar *data;
+  gsize size;
+  gsize position;
+} png_io;
+
+
+static void
+png_read_func (png_structp png,
+               png_bytep   data,
+               png_size_t  size)
+{
+  png_io *io;
+
+  io = png_get_io_ptr (png);
+
+  if (io->position + size > io->size)
+    png_error (png, "Read past EOF");
+
+  memcpy (data, io->data + io->position, size);
+  io->position += size;
+}
+
+static void
+png_write_func (png_structp png,
+                png_bytep   data,
+                png_size_t  size)
+{
+  png_io *io;
+
+  io = png_get_io_ptr (png);
+
+  if (io->position > io->size ||
+      io->size - io->position  < size)
+    {
+      io->size = io->position + size;
+      io->data = g_realloc (io->data, io->size);
+    }
+
+  memcpy (io->data + io->position, data, size);
+  io->position += size;
+}
+
+static void
+png_flush_func (png_structp png)
+{
+}
+
+static png_voidp
+png_malloc_callback (png_structp o,
+                     png_size_t  size)
+{
+  return g_try_malloc (size);
+}
+
+static void
+png_free_callback (png_structp o,
+                   png_voidp   x)
+{
+  g_free (x);
+}
+
+static void
+png_simple_error_callback (png_structp     png,
+                           png_const_charp error_msg)
+{
+  GError **error = png_get_error_ptr (png);
+
+  if (error && !*error)
+    g_set_error (error,
+                 GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_CORRUPT_IMAGE,
+                 _("Error reading png (%s)"), error_msg);
+
+  longjmp (png_jmpbuf (png), 1);
+}
+
+static void
+png_simple_warning_callback (png_structp     png,
+                             png_const_charp error_msg)
+{
+}
+
+/* }}} */
+/* {{{ Format conversion */
+
+static void
+unpremultiply (guchar *data,
+               int     width,
+               int     height)
+{
+  gsize x, y;
+
+  for (y = 0; y < height; y++)
+    {
+      for (x = 0; x < width; x++)
+        {
+          guchar *b = &data[x * 4];
+          guint32 pixel;
+          guchar alpha;
+
+          memcpy (&pixel, b, sizeof (guint32));
+          alpha = (pixel & 0xff000000) >> 24;
+          if (alpha == 0)
+            {
+              b[0] = 0;
+              b[1] = 0;
+              b[2] = 0;
+              b[3] = 0;
+            }
+          else
+            {
+              b[0] = (((pixel & 0x00ff0000) >> 16) * 255 + alpha / 2) / alpha;
+              b[1] = (((pixel & 0x0000ff00) >>  8) * 255 + alpha / 2) / alpha;
+              b[2] = (((pixel & 0x000000ff) >>  0) * 255 + alpha / 2) / alpha;
+              b[3] = alpha;
+            }
+        }
+      data += width * 4;
+    }
+}
+
+static void
+unpremultiply_float_to_16bit (guchar *data,
+                              int     width,
+                              int     height)
+{
+  gsize x, y;
+  float *src = (float *)data;;
+  guint16 *dest = (guint16 *)data;
+
+  for (y = 0; y < height; y++)
+    {
+      for (x = 0; x < width; x++)
+        {
+          float r, g, b, a;
+
+          r = src[0];
+          g = src[1];
+          b = src[2];
+          a = src[3];
+          if (a == 0)
+            {
+              dest[0] = 0;
+              dest[1] = 0;
+              dest[2] = 0;
+              dest[3] = 0;
+            }
+          else
+            {
+              dest[0] = (guint16) CLAMP (65536.f * r / a, 0.f, 65535.f);
+              dest[1] = (guint16) CLAMP (65536.f * g / a, 0.f, 65535.f);
+              dest[2] = (guint16) CLAMP (65536.f * b / a, 0.f, 65535.f);
+              dest[3] = (guint16) CLAMP (65536.f * a,     0.f, 65535.f);
+            }
+
+          dest += 4;
+          src += 4;
+        }
+    }
+}
+
+static inline int
+multiply_alpha (int alpha, int color)
+{
+  int temp = (alpha * color) + 0x80;
+  return ((temp + (temp >> 8)) >> 8);
+}
+
+static void
+premultiply_data (png_structp   png,
+                  png_row_infop row_info,
+                  png_bytep     data)
+{
+  unsigned int i;
+
+  for (i = 0; i < row_info->rowbytes; i += 4)
+    {
+      uint8_t *base  = &data[i];
+      uint8_t  alpha = base[3];
+      uint32_t p;
+
+      if (alpha == 0)
+        {
+          p = 0;
+        }
+      else
+        {
+          uint8_t  red   = base[0];
+          uint8_t  green = base[1];
+          uint8_t  blue  = base[2];
+
+          if (alpha != 0xff)
+            {
+              red   = multiply_alpha (alpha, red);
+              green = multiply_alpha (alpha, green);
+              blue  = multiply_alpha (alpha, blue);
+            }
+          p = ((uint32_t)alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
+        }
+      memcpy (base, &p, sizeof (uint32_t));
+  }
+}
+
+static void
+convert_bytes_to_data (png_structp   png,
+                       png_row_infop row_info,
+                       png_bytep     data)
+{
+  unsigned int i;
+
+  for (i = 0; i < row_info->rowbytes; i += 4)
+    {
+      uint8_t *base  = &data[i];
+      uint8_t  red   = base[0];
+      uint8_t  green = base[1];
+      uint8_t  blue  = base[2];
+      uint32_t pixel;
+
+      pixel = (0xffu << 24) | (red << 16) | (green << 8) | (blue << 0);
+      memcpy (base, &pixel, sizeof (uint32_t));
+    }
+}
+
+static void
+premultiply_16bit (guchar *data,
+                   int     width,
+                   int     height,
+                   int     stride)
+{
+  gsize x, y;
+  guint16 *src;
+
+  for (y = 0; y < height; y++)
+    {
+      src = (guint16 *)data;
+      for (x = 0; x < width; x++)
+        {
+          float alpha = src[x * 4 + 3] / 65535.f;
+          src[x * 4    ] = (guint16) CLAMP (src[x * 4    ] * alpha, 0.f, 65535.f);
+          src[x * 4 + 1] = (guint16) CLAMP (src[x * 4 + 1] * alpha, 0.f, 65535.f);
+          src[x * 4 + 2] = (guint16) CLAMP (src[x * 4 + 2] * alpha, 0.f, 65535.f);
+        }
+
+      data += stride;
+    }
+}
+
+/* }}} */
+/* {{{ Public API */ 
+
+GdkTexture *
+gdk_load_png (GBytes  *bytes,
+              GError **error)
+{
+  png_io io;
+  png_struct *png = NULL;
+  png_info *info;
+  guint width, height;
+  int depth, color_type;
+  int interlace, stride;
+  GdkMemoryFormat format;
+  guchar *buffer = NULL;
+  guchar **row_pointers = NULL;
+  GBytes *out_bytes;
+  GdkTexture *texture;
+  int bpp;
+  G_GNUC_UNUSED gint64 before = GDK_PROFILER_CURRENT_TIME;
+
+  io.data = (guchar *)g_bytes_get_data (bytes, &io.size);
+  io.position = 0;
+
+  png = png_create_read_struct_2 (PNG_LIBPNG_VER_STRING,
+                                  error,
+                                  png_simple_error_callback,
+                                  png_simple_warning_callback,
+                                  NULL,
+                                  png_malloc_callback,
+                                  png_free_callback);
+  if (png == NULL)
+    g_error ("Out of memory");
+
+  info = png_create_info_struct (png);
+  if (info == NULL)
+    g_error ("Out of memory");
+
+  png_set_read_fn (png, &io, png_read_func);
+
+  if (sigsetjmp (png_jmpbuf (png), 1))
+    {
+      g_free (buffer);
+      g_free (row_pointers);
+      png_destroy_read_struct (&png, &info, NULL);
+      return NULL;
+    }
+
+  png_read_info (png, info);
+
+  png_get_IHDR (png, info,
+                &width, &height, &depth,
+                &color_type, &interlace, NULL, NULL);
+
+  if (color_type == PNG_COLOR_TYPE_PALETTE)
+    png_set_palette_to_rgb (png);
+
+  if (color_type == PNG_COLOR_TYPE_GRAY)
+    png_set_expand_gray_1_2_4_to_8 (png);
+
+  if (png_get_valid (png, info, PNG_INFO_tRNS))
+    png_set_tRNS_to_alpha (png);
+
+  if (depth == 8)
+    png_set_filler (png, 0xff, PNG_FILLER_AFTER);
+
+  if (depth < 8)
+    png_set_packing (png);
+
+  if (color_type == PNG_COLOR_TYPE_GRAY ||
+      color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+    png_set_gray_to_rgb (png);
+
+  if (interlace != PNG_INTERLACE_NONE)
+    png_set_interlace_handling (png);
+
+  png_read_update_info (png, info);
+  png_get_IHDR (png, info,
+                &width, &height, &depth,
+                &color_type, &interlace, NULL, NULL);
+  if ((depth != 8 && depth != 16) ||
+      !(color_type == PNG_COLOR_TYPE_RGB ||
+        color_type == PNG_COLOR_TYPE_RGB_ALPHA))
+    {
+      png_destroy_read_struct (&png, &info, NULL);
+      g_set_error (error,
+                   GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_UNSUPPORTED_CONTENT,
+                   _("Failed to parse png image"));
+      return NULL;
+    }
+
+  switch (color_type)
+    {
+    case PNG_COLOR_TYPE_RGB_ALPHA:
+      if (depth == 8)
+        {
+          format = GDK_MEMORY_DEFAULT;
+          png_set_read_user_transform_fn (png, premultiply_data);
+        }
+      else
+        {
+          format = GDK_MEMORY_R16G16B16A16_PREMULTIPLIED;
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+          png_set_swap (png);
+#endif
+        }
+      break;
+    case PNG_COLOR_TYPE_RGB:
+      if (depth == 8)
+        {
+          format = GDK_MEMORY_DEFAULT;
+          png_set_read_user_transform_fn (png, convert_bytes_to_data);
+        }
+      else
+        {
+          format = GDK_MEMORY_R16G16B16;
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+          png_set_swap (png);
+#endif
+        }
+      break;
+    default:
+      g_assert_not_reached ();
+    }
+
+  bpp = gdk_memory_format_bytes_per_pixel (format);
+  stride = width * bpp;
+  if (stride % 8)
+    stride += 8 - stride % 8;
+
+  buffer = g_try_malloc_n (height, stride);
+  row_pointers = g_try_malloc_n (height, sizeof (char *));
+
+  if (!buffer || !row_pointers)
+    {
+      g_free (buffer);
+      g_free (row_pointers);
+      png_destroy_read_struct (&png, &info, NULL);
+      g_set_error (error,
+                   GDK_TEXTURE_ERROR, GDK_TEXTURE_ERROR_TOO_LARGE,
+                   _("Not enough memory for image size %ux%u"), width, height);
+      return NULL;
+    }
+
+  for (int i = 0; i < height; i++)
+    row_pointers[i] = &buffer[i * stride];
+
+  png_read_image (png, row_pointers);
+  png_read_end (png, info);
+
+  if (format == GDK_MEMORY_R16G16B16A16_PREMULTIPLIED)
+    premultiply_16bit (buffer, width, height, stride);
+
+  out_bytes = g_bytes_new_take (buffer, height * stride);
+  texture = gdk_memory_texture_new (width, height, format, out_bytes, stride);
+  g_bytes_unref (out_bytes);
+
+  g_free (row_pointers);
+  png_destroy_read_struct (&png, &info, NULL);
+
+  if (GDK_PROFILER_IS_RUNNING)
+    {
+      gint64 end = GDK_PROFILER_CURRENT_TIME;
+      if (end - before > 500000)
+        gdk_profiler_add_mark (before, end - before, "png load", NULL);
+    }
+
+  return texture;
+}
+
+GBytes *
+gdk_save_png (GdkTexture *texture)
+{
+  png_struct *png = NULL;
+  png_info *info;
+  png_io io = { NULL, 0, 0 };
+  guint width, height, stride;
+  guchar *data = NULL;
+  guchar *row;
+  int y;
+  GdkTexture *mtexture;
+  GdkMemoryFormat format;
+  int png_format;
+  int depth;
+
+  width = gdk_texture_get_width (texture);
+  height = gdk_texture_get_height (texture);
+
+  mtexture = gdk_texture_download_texture (texture);
+  format = gdk_memory_texture_get_format (GDK_MEMORY_TEXTURE (mtexture));
+
+  switch (format)
+    {
+    case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
+    case GDK_MEMORY_A8R8G8B8_PREMULTIPLIED:
+    case GDK_MEMORY_R8G8B8A8_PREMULTIPLIED:
+    case GDK_MEMORY_B8G8R8A8:
+    case GDK_MEMORY_A8R8G8B8:
+    case GDK_MEMORY_R8G8B8A8:
+    case GDK_MEMORY_A8B8G8R8:
+    case GDK_MEMORY_R8G8B8:
+    case GDK_MEMORY_B8G8R8:
+      stride = width * 4;
+      data = g_malloc_n (stride, height);
+      gdk_texture_download (mtexture, data, stride);
+      unpremultiply (data, width, height);
+
+      png_format = PNG_COLOR_TYPE_RGB_ALPHA;
+      depth = 8;
+      break;
+
+    case GDK_MEMORY_R16G16B16:
+    case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
+    case GDK_MEMORY_R16G16B16_FLOAT:
+    case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
+    case GDK_MEMORY_R32G32B32_FLOAT:
+    case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
+      data = g_malloc_n (width * 16, height);
+      gdk_texture_download_float (mtexture, (float *)data, width * 4);
+      unpremultiply_float_to_16bit (data, width, height);
+
+      png_format = PNG_COLOR_TYPE_RGB_ALPHA;
+      stride = width * 8;
+      depth = 16;
+      break;
+
+    case GDK_MEMORY_N_FORMATS:
+    default:
+      g_assert_not_reached ();
+    }
+
+  png = png_create_write_struct_2 (PNG_LIBPNG_VER_STRING, NULL,
+                                   png_simple_error_callback,
+                                   png_simple_warning_callback,
+                                   NULL,
+                                   png_malloc_callback,
+                                   png_free_callback);
+  if (!png)
+    return NULL;
+
+  info = png_create_info_struct (png);
+  if (!info)
+    {
+      png_destroy_read_struct (&png, NULL, NULL);
+      return NULL;
+    }
+
+  if (sigsetjmp (png_jmpbuf (png), 1))
+    {
+      g_free (data);
+      g_free (io.data);
+      png_destroy_read_struct (&png, &info, NULL);
+      return NULL;
+    }
+
+  png_set_write_fn (png, &io, png_write_func, png_flush_func);
+
+  png_set_IHDR (png, info, width, height, depth,
+                png_format,
+                PNG_INTERLACE_NONE,
+                PNG_COMPRESSION_TYPE_DEFAULT,
+                PNG_FILTER_TYPE_DEFAULT);
+
+  png_write_info (png, info);
+
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+  png_set_swap (png);
+#endif
+
+  for (y = 0, row = data; y < height; y++, row += stride)
+    png_write_rows (png, &row, 1);
+
+  png_write_end (png, info);
+
+  png_destroy_write_struct (&png, &info);
+
+  g_free (data);
+
+  return g_bytes_new_take (io.data, io.size);
+}
+
+/* }}} */
+
+/* vim:set foldmethod=marker expandtab: */

gdk/loaders/gdkpngprivate.h

@@ -0,0 +1,43 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2021 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GDK_PNG_PRIVATE_H__
+#define __GDK_PNG_PRIVATE_H__
+
+#include "gdktexture.h"
+#include <gio/gio.h>
+
+#define PNG_SIGNATURE "\x89PNG"
+
+GdkTexture *gdk_load_png        (GBytes         *bytes,
+                                 GError        **error);
+
+GBytes     *gdk_save_png        (GdkTexture     *texture);
+
+static inline gboolean
+gdk_is_png (GBytes *bytes)
+{
+  const char *data;
+  gsize size;
+
+  data = g_bytes_get_data (bytes, &size);
+
+  return size > strlen (PNG_SIGNATURE) &&
+         memcmp (data, PNG_SIGNATURE, strlen (PNG_SIGNATURE)) == 0;
+}
+
+#endif