gsk: Add gsk_texture_download() API

Now users can download pixels and make everything slooooooow.

docs/reference/gsk/gsk4-sections.txt

@@ -12,6 +12,7 @@ gsk_renderer_unrealize
 gsk_renderer_begin_draw_frame
 gsk_renderer_end_draw_frame
 gsk_renderer_render
+gsk_renderer_render_texture
 <SUBSECTION Standard>
 GSK_IS_RENDERER
 GSK_RENDERER
@@ -32,6 +33,8 @@ gsk_render_node_draw
 GskScalingFilter
 gsk_render_node_set_scaling_filters
 gsk_render_node_set_name
+gsk_render_node_get_name
+gsk_render_node_get_bounds
 gsk_color_node_new
 gsk_linear_gradient_node_new
 gsk_repeating_linear_gradient_node_new
@@ -68,6 +71,22 @@ gsk_render_node_get_type
 GSK_TYPE_BLEND_MODE
 </SECTION>
 
+<SECTION>
+<FILE>GskTexture</FILE>
+gsk_texture_ref
+gsk_texture_unref
+gsk_texture_new_for_data
+gsk_texture_new_for_pixbuf
+gsk_texture_get_width
+gsk_texture_get_height
+gsk_texture_download
+<SUBSECTION Standard>
+GskTexture
+gsk_texture_get_type
+GSK_TYPE_TEXTURE
+GSK_IS_TEXTURE
+</SECTION>
+
 <SECTION>
 <FILE>GskRoundedRect</FILE>
 GskCorner

gdk/gdkcairo.c

@@ -151,7 +151,7 @@ gdk_cairo_region (cairo_t              *cr,
     }
 }
 
-static void
+void
 gdk_cairo_surface_paint_pixbuf (cairo_surface_t *surface,
                                 const GdkPixbuf *pixbuf)
 {
@@ -198,7 +198,9 @@ gdk_cairo_surface_paint_pixbuf (cairo_surface_t *surface,
               q[0] = p[2];
               q[1] = p[1];
               q[2] = p[0];
+              q[3] = 0xFF;
 #else
+              q[0] = 0xFF;
               q[1] = p[0];
               q[2] = p[1];
               q[3] = p[2];

gdk/gdkinternals.h

@@ -343,6 +343,9 @@ void           gdk_gl_texture_quads               (GdkGLContext *paint_context,
                                                    GdkTexturedQuad *quads,
                                                    gboolean flip_colors);
 
+void            gdk_cairo_surface_paint_pixbuf   (cairo_surface_t *surface,
+                                                  const GdkPixbuf *pixbuf);
+
 void            gdk_cairo_surface_mark_as_direct (cairo_surface_t *surface,
                                                   GdkWindow       *window);
 cairo_region_t *gdk_cairo_region_from_clip       (cairo_t         *cr);

gsk/gskcairorenderer.c

@@ -18,8 +18,6 @@ struct _GskCairoRenderer
 {
   GskRenderer parent_instance;
 
-  graphene_rect_t viewport;
-
 #ifdef G_ENABLE_DEBUG
   ProfileTimers profile_timers;
 #endif
@@ -47,44 +45,16 @@ gsk_cairo_renderer_unrealize (GskRenderer *renderer)
 }
 
 static void
-gsk_cairo_renderer_render (GskRenderer   *renderer,
-                           GskRenderNode *root)
+gsk_cairo_renderer_do_render (GskRenderer   *renderer,
+                              cairo_t       *cr,
+                              GskRenderNode *root)
 {
-  GskCairoRenderer *self = GSK_CAIRO_RENDERER (renderer);
-  GdkDrawingContext *context = gsk_renderer_get_drawing_context (renderer);
 #ifdef G_ENABLE_DEBUG
+  GskCairoRenderer *self = GSK_CAIRO_RENDERER (renderer);
   GskProfiler *profiler;
   gint64 cpu_time;
 #endif
 
-  cairo_t *cr;
-
-  cr = gdk_drawing_context_get_cairo_context (context);
-
-  g_return_if_fail (cr != NULL);
-
-  gsk_renderer_get_viewport (renderer, &self->viewport);
-
-  cairo_save (cr);
-  cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
-  cairo_set_source_rgba (cr, 0, 0, 0, 0);
-  cairo_paint (cr);
-  cairo_restore (cr);
-
-  if (GSK_RENDER_MODE_CHECK (GEOMETRY))
-    {
-      cairo_save (cr);
-      cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
-      cairo_rectangle (cr,
-                       self->viewport.origin.x,
-                       self->viewport.origin.y,
-                       self->viewport.size.width,
-                       self->viewport.size.height);
-      cairo_set_source_rgba (cr, 0, 0, 0.85, 0.5);
-      cairo_stroke (cr);
-      cairo_restore (cr);
-    }
-
 #ifdef G_ENABLE_DEBUG
   profiler = gsk_renderer_get_profiler (renderer);
   gsk_profiler_timer_begin (profiler, self->profile_timers.cpu_time);
@@ -100,6 +70,62 @@ gsk_cairo_renderer_render (GskRenderer   *renderer,
 #endif
 }
 
+static GskTexture *
+gsk_cairo_renderer_render_texture (GskRenderer           *renderer,
+                                   GskRenderNode         *root,
+                                   const graphene_rect_t *viewport)
+{
+  GskTexture *texture;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+
+  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, ceil (viewport->size.width), ceil (viewport->size.height));
+  cr = cairo_create (surface);
+
+  cairo_translate (cr, - viewport->origin.x, - viewport->origin.y);
+
+  gsk_cairo_renderer_do_render (renderer, cr, root);
+
+  cairo_destroy (cr);
+
+  texture = gsk_texture_new_for_surface (surface);
+  cairo_surface_destroy (surface);
+
+  return texture;
+}
+
+static void
+gsk_cairo_renderer_render (GskRenderer   *renderer,
+                           GskRenderNode *root)
+{
+  GdkDrawingContext *context = gsk_renderer_get_drawing_context (renderer);
+  graphene_rect_t viewport;
+
+  cairo_t *cr;
+
+  cr = gdk_drawing_context_get_cairo_context (context);
+
+  g_return_if_fail (cr != NULL);
+
+  gsk_renderer_get_viewport (renderer, &viewport);
+
+  if (GSK_RENDER_MODE_CHECK (GEOMETRY))
+    {
+      cairo_save (cr);
+      cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+      cairo_rectangle (cr,
+                       viewport.origin.x,
+                       viewport.origin.y,
+                       viewport.size.width,
+                       viewport.size.height);
+      cairo_set_source_rgba (cr, 0, 0, 0.85, 0.5);
+      cairo_stroke (cr);
+      cairo_restore (cr);
+    }
+
+  gsk_cairo_renderer_do_render (renderer, cr, root);
+}
+
 static void
 gsk_cairo_renderer_class_init (GskCairoRendererClass *klass)
 {
@@ -108,6 +134,7 @@ gsk_cairo_renderer_class_init (GskCairoRendererClass *klass)
   renderer_class->realize = gsk_cairo_renderer_realize;
   renderer_class->unrealize = gsk_cairo_renderer_unrealize;
   renderer_class->render = gsk_cairo_renderer_render;
+  renderer_class->render_texture = gsk_cairo_renderer_render_texture;
 }
 
 static void

gsk/gskgldriver.c

@@ -462,7 +462,7 @@ gsk_gl_driver_get_texture_for_texture (GskGLDriver *driver,
   if (gsk_texture_set_render_data (texture, driver, t, gsk_gl_driver_release_texture))
     t->user = texture;
 
-  surface = gsk_texture_download (texture);
+  surface = gsk_texture_download_surface (texture);
   gsk_gl_driver_bind_source_texture (driver, t->texture_id);
   gsk_gl_driver_init_texture_with_surface (driver,
                                            t->texture_id,

gsk/gskrenderer.c

@@ -113,6 +113,15 @@ gsk_renderer_real_unrealize (GskRenderer *self)
   GSK_RENDERER_WARN_NOT_IMPLEMENTED_METHOD (self, unrealize);
 }
 
+static GskTexture *
+gsk_renderer_real_render_texture (GskRenderer           *self,
+                                  GskRenderNode         *root,
+                                  const graphene_rect_t *viewport)
+{
+  GSK_RENDERER_WARN_NOT_IMPLEMENTED_METHOD (self, render_texture);
+  return NULL;
+}
+
 static GdkDrawingContext *
 gsk_renderer_real_begin_draw_frame (GskRenderer          *self,
                                     const cairo_region_t *region)
@@ -259,6 +268,7 @@ gsk_renderer_class_init (GskRendererClass *klass)
   klass->begin_draw_frame = gsk_renderer_real_begin_draw_frame;
   klass->end_draw_frame = gsk_renderer_real_end_draw_frame;
   klass->render = gsk_renderer_real_render;
+  klass->render_texture = gsk_renderer_real_render_texture;
   klass->create_cairo_surface = gsk_renderer_real_create_cairo_surface;
 
   gobject_class->constructed = gsk_renderer_constructed;
@@ -606,6 +616,75 @@ gsk_renderer_unrealize (GskRenderer *renderer)
   priv->is_realized = FALSE;
 }
 
+/**
+ * gsk_renderer_render_texture:
+ * @renderer: a realized #GdkRenderer
+ * @root: a #GskRenderNode
+ * @viewport: (allow-none): the section to draw or %NULL to use @root's bounds
+ *
+ * Renders the scene graph, described by a tree of #GskRenderNode instances,
+ * to a #GskTexture.
+ *
+ * The @renderer will acquire a reference on the #GskRenderNode tree while
+ * the rendering is in progress, and will make the tree immutable.
+ *
+ * If you want to apply any transformations to @root, you should put it into a 
+ * transform node and pass that node instead.
+ *
+ * Returns: (transfer full): a #GskTexture with the rendered contents of @root.
+ *
+ * Since: 3.90
+ */
+GskTexture *
+gsk_renderer_render_texture (GskRenderer           *renderer,
+                             GskRenderNode         *root,
+                             const graphene_rect_t *viewport)
+{
+  GskRendererPrivate *priv = gsk_renderer_get_instance_private (renderer);
+  graphene_rect_t real_viewport;
+  GskTexture *texture;
+
+  g_return_val_if_fail (GSK_IS_RENDERER (renderer), NULL);
+  g_return_val_if_fail (priv->is_realized, NULL);
+  g_return_val_if_fail (GSK_IS_RENDER_NODE (root), NULL);
+  g_return_val_if_fail (priv->root_node == NULL, NULL);
+
+  priv->root_node = gsk_render_node_ref (root);
+
+  if (viewport == NULL)
+    {
+      gsk_render_node_get_bounds (root, &real_viewport);
+      viewport = &real_viewport;
+    }
+
+#ifdef G_ENABLE_DEBUG
+  gsk_profiler_reset (priv->profiler);
+#endif
+
+  texture = GSK_RENDERER_GET_CLASS (renderer)->render_texture (renderer, root, viewport);
+
+#ifdef G_ENABLE_DEBUG
+  if (GSK_DEBUG_CHECK (RENDERER))
+    {
+      GString *buf = g_string_new ("*** Texture stats ***\n\n");
+
+      gsk_profiler_append_counters (priv->profiler, buf);
+      g_string_append_c (buf, '\n');
+
+      gsk_profiler_append_timers (priv->profiler, buf);
+      g_string_append_c (buf, '\n');
+
+      g_print ("%s\n***\n\n", buf->str);
+
+      g_string_free (buf, TRUE);
+    }
+#endif
+
+  g_clear_pointer (&priv->root_node, gsk_render_node_unref);
+
+  return texture;
+}
+
 /**
  * gsk_renderer_render:
  * @renderer: a #GskRenderer

gsk/gskrenderer.h

@@ -53,9 +53,6 @@ void                    gsk_renderer_set_scale_factor           (GskRenderer
 GDK_AVAILABLE_IN_3_90
 int                     gsk_renderer_get_scale_factor           (GskRenderer             *renderer);
 GDK_AVAILABLE_IN_3_90
-void                    gsk_renderer_set_window                 (GskRenderer             *renderer,
-                                                                 GdkWindow               *window);
-GDK_AVAILABLE_IN_3_90
 GdkWindow *             gsk_renderer_get_window                 (GskRenderer             *renderer);
 
 GDK_AVAILABLE_IN_3_90
@@ -69,9 +66,9 @@ GDK_AVAILABLE_IN_3_90
 void                    gsk_renderer_unrealize                  (GskRenderer             *renderer);
 
 GDK_AVAILABLE_IN_3_90
-GskRenderer *           gsk_renderer_create_fallback            (GskRenderer             *renderer,
-                                                                 const graphene_rect_t   *viewport,
-                                                                 cairo_t                 *cr);
+GskTexture *            gsk_renderer_render_texture             (GskRenderer             *renderer,
+                                                                 GskRenderNode           *root,
+                                                                 const graphene_rect_t   *viewport);
 
 GDK_AVAILABLE_IN_3_90
 GdkDrawingContext *     gsk_renderer_begin_draw_frame           (GskRenderer             *renderer,

gsk/gskrendererprivate.h

@@ -42,6 +42,9 @@ struct _GskRendererClass
                         GError **error);
   void (* unrealize) (GskRenderer *renderer);
 
+  GskTexture * (* render_texture) (GskRenderer           *renderer,
+                                   GskRenderNode         *root,
+                                   const graphene_rect_t *viewport);
   GdkDrawingContext * (* begin_draw_frame) (GskRenderer *renderer,
                                             const cairo_region_t *region);
   void (* end_draw_frame) (GskRenderer *renderer,

gsk/gskrendernode.c

@@ -285,4 +285,54 @@ gsk_render_node_draw (GskRenderNode *node,
   cairo_restore (cr);
 }
 
+#define GSK_RENDER_NODE_SERIALIZATION_VERSION 0
+#define GSK_RENDER_NODE_SERIALIZATION_ID "GskRenderNode"
+
+GBytes *
+gsk_render_node_serialize (GskRenderNode *node)
+{
+  GVariant *node_variant, *variant;
+  GBytes *result;
+
+  node_variant = gsk_render_node_serialize_node (node);
+
+  variant = g_variant_new ("(suuv)",
+                           GSK_RENDER_NODE_SERIALIZATION_ID,
+                           (guint32) GSK_RENDER_NODE_SERIALIZATION_VERSION,
+                           (guint32) gsk_render_node_get_node_type (node),
+                           node_variant);
+
+  result = g_variant_get_data_as_bytes (variant);
+  g_variant_unref (variant);
+
+  return result;
+}
+
+GskRenderNode *
+gsk_render_node_deserialize (GBytes *bytes)
+{
+  char *id_string;
+  guint32 version, node_type;
+  GVariant *variant, *node_variant;
+  GskRenderNode *node = NULL;
+
+  variant = g_variant_new_from_bytes (G_VARIANT_TYPE ("(suuv)"), bytes, FALSE);
+
+  g_variant_get (variant, "(suuv)", &id_string, &version, &node_type, &node_variant);
+
+  if (!g_str_equal (id_string, GSK_RENDER_NODE_SERIALIZATION_ID))
+    goto out;
+
+  if (version != GSK_RENDER_NODE_SERIALIZATION_VERSION)
+    goto out;
+
+  node = gsk_render_node_deserialize_node (node_type, node_variant);
+
+out:
+  g_free (id_string);
+  g_variant_unref (node_variant);
+  g_variant_unref (variant);
+
+  return node;
+}
 

gsk/gskrendernode.h

@@ -47,7 +47,6 @@ struct _GskShadow
   GdkRGBA color;
   float dx;
   float dy;
-  float spread;
   float radius;
 };
 
@@ -167,10 +166,19 @@ void                    gsk_render_node_set_name                (GskRenderNode *
                                                                  const char    *name);
 GDK_AVAILABLE_IN_3_90
 const char *            gsk_render_node_get_name                (GskRenderNode *node);
+GDK_AVAILABLE_IN_3_90
+void                    gsk_render_node_get_bounds              (GskRenderNode   *node,
+                                                                 graphene_rect_t *frame);
 
 GDK_AVAILABLE_IN_3_90
 void                    gsk_render_node_draw                    (GskRenderNode *node,
                                                                  cairo_t       *cr);
+
+GDK_AVAILABLE_IN_3_90
+GBytes *                gsk_render_node_serialize               (GskRenderNode *node);
+GDK_AVAILABLE_IN_3_90
+GskRenderNode *         gsk_render_node_deserialize             (GBytes        *bytes);
+
 G_END_DECLS
 
 #endif /* __GSK_RENDER_NODE_H__ */

gsk/gskrendernodeprivate.h

@@ -34,18 +34,22 @@ struct _GskRenderNodeClass
   void (* finalize) (GskRenderNode *node);
   void (* draw) (GskRenderNode *node,
                  cairo_t       *cr);
+  GVariant * (* serialize) (GskRenderNode *node);
+  GskRenderNode * (* deserialize) (GVariant *variant);
 };
 
 GskRenderNode *gsk_render_node_new (const GskRenderNodeClass *node_class, gsize extra_size);
 
-void gsk_render_node_get_bounds (GskRenderNode   *node,
-                                 graphene_rect_t *frame);
+GVariant * gsk_render_node_serialize_node (GskRenderNode *node);
+GskRenderNode * gsk_render_node_deserialize_node (GskRenderNodeType type, GVariant *variant);
+
 double gsk_opacity_node_get_opacity (GskRenderNode *node);
 
 const GskRoundedRect * gsk_border_node_peek_outline (GskRenderNode *node);
 float gsk_border_node_get_width (GskRenderNode *node, guint i);
 const GdkRGBA * gsk_border_node_peek_color (GskRenderNode *node, guint i);
 
+GskRenderNode *gsk_cairo_node_new_for_surface (const graphene_rect_t *bounds, cairo_surface_t *surface);
 cairo_surface_t *gsk_cairo_node_get_surface (GskRenderNode *node);
 
 GskTexture *gsk_texture_node_get_texture (GskRenderNode *node);

gsk/gsktexture.c

@@ -37,6 +37,8 @@
 #include "gskdebugprivate.h"
 #include "gskrenderer.h"
 
+#include "gdk/gdkinternals.h"
+
 /**
  * GskTexture: (ref-func gsk_texture_ref) (unref-func gsk_texture_unref)
  *
@@ -135,18 +137,43 @@ gsk_texture_cairo_finalize (GskTexture *texture)
 }
 
 static cairo_surface_t *
-gsk_texture_cairo_download (GskTexture *texture)
+gsk_texture_cairo_download_surface (GskTexture *texture)
 {
   GskCairoTexture *cairo = (GskCairoTexture *) texture;
 
   return cairo_surface_reference (cairo->surface);
 }
 
+static void
+gsk_texture_cairo_download (GskTexture *texture,
+                            guchar     *data,
+                            gsize       stride)
+{
+  GskCairoTexture *cairo = (GskCairoTexture *) texture;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+
+  surface = cairo_image_surface_create_for_data (data,
+                                                 CAIRO_FORMAT_ARGB32,
+                                                 texture->width, texture->height,
+                                                 stride);
+  cr = cairo_create (surface);
+
+  cairo_set_source_surface (cr, cairo->surface, 0, 0);
+  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+  cairo_paint (cr);
+
+  cairo_destroy (cr);
+  cairo_surface_finish (surface);
+  cairo_surface_destroy (surface);
+}
+
 static const GskTextureClass GSK_TEXTURE_CLASS_CAIRO = {
   "cairo",
   sizeof (GskCairoTexture),
   gsk_texture_cairo_finalize,
-  gsk_texture_cairo_download
+  gsk_texture_cairo_download,
+  gsk_texture_cairo_download_surface
 };
 
 GskTexture *
@@ -208,8 +235,25 @@ gsk_texture_pixbuf_finalize (GskTexture *texture)
   g_object_unref (pixbuf->pixbuf);
 }
 
+static void
+gsk_texture_pixbuf_download (GskTexture *texture,
+                             guchar     *data,
+                             gsize       stride)
+{
+  GskPixbufTexture *pixbuf = (GskPixbufTexture *) texture;
+  cairo_surface_t *surface;
+
+  surface = cairo_image_surface_create_for_data (data,
+                                                 CAIRO_FORMAT_ARGB32,
+                                                 texture->width, texture->height,
+                                                 stride);
+  gdk_cairo_surface_paint_pixbuf (surface, pixbuf->pixbuf);
+  cairo_surface_finish (surface);
+  cairo_surface_destroy (surface);
+}
+
 static cairo_surface_t *
-gsk_texture_pixbuf_download (GskTexture *texture)
+gsk_texture_pixbuf_download_surface (GskTexture *texture)
 {
   GskPixbufTexture *pixbuf = (GskPixbufTexture *) texture;
 
@@ -220,7 +264,8 @@ static const GskTextureClass GSK_TEXTURE_CLASS_PIXBUF = {
   "pixbuf",
   sizeof (GskPixbufTexture),
   gsk_texture_pixbuf_finalize,
-  gsk_texture_pixbuf_download
+  gsk_texture_pixbuf_download,
+  gsk_texture_pixbuf_download_surface
 };
 
 GskTexture *
@@ -276,9 +321,59 @@ gsk_texture_get_height (GskTexture *texture)
 }
 
 cairo_surface_t *
-gsk_texture_download (GskTexture *texture)
+gsk_texture_download_surface (GskTexture *texture)
 {
-  return texture->klass->download (texture);
+  cairo_surface_t *surface;
+
+  if (texture->klass->download_surface)
+    return texture->klass->download_surface (texture);
+
+  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+                                        texture->width, texture->height);
+  gsk_texture_download (texture,
+                        cairo_image_surface_get_data (surface),
+                        cairo_image_surface_get_stride (surface));
+  cairo_surface_mark_dirty (surface);
+
+  return surface;
+}
+
+/**
+ * gsk_texture_download:
+ * @texture: a #GskTexture
+ * @data: pointer to enough memory to be filled with the
+ *     downloaded data of @texture
+ * @stride: rowstride in bytes
+ *
+ * Downloads the @texture into local memory. This may be
+ * an expensive operation, as the actual texture data may
+ * reside on a GPU or on a remote display server.
+ *
+ * The data format of the downloaded data is equivalent to
+ * %CAIRO_FORMAT_ARGB32, so every downloaded pixel requires
+ * 4 bytes of memory.
+ *
+ * Downloading a texture into a Cairo image surface:
+ * |[<!-- language="C" -->
+ * surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+ *                                       gsk_texture_get_width (texture),
+ *                                       gsk_texture_get_height (texture));
+ * gsk_texture_download (texture,
+ *                       cairo_image_surface_get_data (surface),
+ *                       cairo_image_surface_get_stride (surface));
+ * cairo_surface_mark_dirty (surface);
+ * ]|
+ **/
+void
+gsk_texture_download (GskTexture *texture,
+                      guchar     *data,
+                      gsize       stride)
+{
+  g_return_if_fail (GSK_IS_TEXTURE (texture));
+  g_return_if_fail (data != NULL);
+  g_return_if_fail (stride >= gsk_texture_get_width (texture) * 4);
+
+  return texture->klass->download (texture, data, stride);
 }
 
 gboolean

gsk/gsktexture.h

@@ -52,6 +52,11 @@ int                     gsk_texture_get_width                  (GskTexture
 GDK_AVAILABLE_IN_3_90
 int                     gsk_texture_get_height                 (GskTexture      *texture);
 
+GDK_AVAILABLE_IN_3_90
+void                    gsk_texture_download                   (GskTexture      *texture,
+                                                                guchar          *data,
+                                                                gsize            stride);
+
 G_END_DECLS
 
 #endif /* __GSK_TEXTURE_H__ */

gsk/gsktextureprivate.h

@@ -30,14 +30,17 @@ struct _GskTextureClass {
   gsize size;
 
   void                  (* finalize)                    (GskTexture             *texture);
-  cairo_surface_t *     (* download)                    (GskTexture             *texture);
+  void                  (* download)                    (GskTexture             *texture,
+                                                         guchar                 *data,
+                                                         gsize                   stride);
+  cairo_surface_t *     (* download_surface)            (GskTexture             *texture);
 };
 
 gpointer                gsk_texture_new                 (const GskTextureClass  *klass,
                                                          int                     width,
                                                          int                     height);
 GskTexture *            gsk_texture_new_for_surface     (cairo_surface_t        *surface);
-cairo_surface_t *       gsk_texture_download            (GskTexture             *texture);
+cairo_surface_t *       gsk_texture_download_surface    (GskTexture             *texture);
 
 gboolean                gsk_texture_set_render_data     (GskTexture             *self,
                                                          gpointer                key,

gsk/gskvulkanrenderer.c

@@ -281,7 +281,7 @@ gsk_vulkan_renderer_ref_texture_image (GskVulkanRenderer *self,
   if (data)
     return g_object_ref (data->image);
 
-  surface = gsk_texture_download (texture);
+  surface = gsk_texture_download_surface (texture);
   image = gsk_vulkan_image_new_from_data (uploader,
                                           cairo_image_surface_get_data (surface),
                                           cairo_image_surface_get_width (surface),

gtk/gtkcssshadowvalue.c

@@ -631,7 +631,6 @@ gtk_css_shadow_value_get_shadow (const GtkCssValue *value,
   shadow->color = *_gtk_css_rgba_value_get_rgba (value->color);
   shadow->dx = _gtk_css_number_value_get (value->hoffset, 0);
   shadow->dy = _gtk_css_number_value_get (value->voffset, 0);
-  shadow->spread = _gtk_css_number_value_get (value->spread, 0);
   shadow->radius = _gtk_css_number_value_get (value->radius, 0);
 }
 

gtk/inspector/recorder.c

@@ -21,8 +21,10 @@
 #include "recorder.h"
 
 #include <gtk/gtkbox.h>
+#include <gtk/gtkfilechooserdialog.h>
 #include <gtk/gtklabel.h>
 #include <gtk/gtklistbox.h>
+#include <gtk/gtkmessagedialog.h>
 #include <gtk/gtktogglebutton.h>
 #include <gtk/gtktreeselection.h>
 #include <gtk/gtktreeview.h>
@@ -43,6 +45,7 @@ struct _GtkInspectorRecorderPrivate
   GtkWidget *recordings_list;
   GtkWidget *render_node_view;
   GtkWidget *render_node_tree;
+  GtkWidget *render_node_save_button;
   GtkWidget *node_property_tree;
   GtkTreeModel *render_node_properties;
 
@@ -219,14 +222,92 @@ render_node_list_selection_changed (GtkTreeSelection     *selection,
   GtkTreeIter iter;
 
   if (!gtk_tree_selection_get_selected (selection, NULL, &iter))
-    return;
+    {
+      gtk_widget_set_sensitive (priv->render_node_save_button, FALSE);
+      return;
+    }
 
+  gtk_widget_set_sensitive (priv->render_node_save_button, TRUE);
   node = gtk_tree_model_render_node_get_node_from_iter (GTK_TREE_MODEL_RENDER_NODE (priv->render_node_model), &iter);
   gtk_render_node_view_set_render_node (GTK_RENDER_NODE_VIEW (priv->render_node_view), node);
 
   populate_render_node_properties (GTK_LIST_STORE (priv->render_node_properties), node);
 }
 
+static void
+render_node_save_response (GtkWidget     *dialog,
+                           gint           response,
+                           GskRenderNode *node)
+{
+  gtk_widget_hide (dialog);
+
+  if (response == GTK_RESPONSE_ACCEPT)
+    {
+      GBytes *bytes = gsk_render_node_serialize (node);
+      GError *error = NULL;
+
+      if (!g_file_replace_contents (gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog)),
+                                    g_bytes_get_data (bytes, NULL),
+                                    g_bytes_get_size (bytes),
+                                    NULL,
+                                    FALSE,
+                                    0,
+                                    NULL,
+                                    NULL,
+                                    &error))
+        {
+          GtkWidget *message_dialog;
+
+          message_dialog = gtk_message_dialog_new (GTK_WINDOW (gtk_window_get_transient_for (GTK_WINDOW (dialog))),
+                                                   GTK_DIALOG_MODAL|GTK_DIALOG_DESTROY_WITH_PARENT,
+                                                   GTK_MESSAGE_INFO,
+                                                   GTK_BUTTONS_OK,
+                                                   _("Saving RenderNode failed"));
+          gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (message_dialog),
+                                                    "%s", error->message);
+          g_signal_connect (message_dialog, "response", G_CALLBACK (gtk_widget_destroy), NULL);
+          gtk_widget_show (message_dialog);
+          g_error_free (error);
+        }
+
+      g_bytes_unref (bytes);
+    }
+
+  gtk_widget_destroy (dialog);
+}
+
+static void
+render_node_save (GtkButton            *button,
+                  GtkInspectorRecorder *recorder)
+{
+  GtkInspectorRecorderPrivate *priv = gtk_inspector_recorder_get_instance_private (recorder);
+  GskRenderNode *node;
+  GtkTreeIter iter;
+  GtkWidget *dialog;
+  char *filename;
+
+  if (!gtk_tree_selection_get_selected (gtk_tree_view_get_selection (GTK_TREE_VIEW (priv->render_node_tree)), NULL, &iter))
+    return;
+
+  node = gtk_tree_model_render_node_get_node_from_iter (GTK_TREE_MODEL_RENDER_NODE (priv->render_node_model), &iter);
+
+  dialog = gtk_file_chooser_dialog_new ("",
+                                        GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (recorder))),
+                                        GTK_FILE_CHOOSER_ACTION_SAVE,
+                                        _("_Cancel"), GTK_RESPONSE_CANCEL,
+                                        _("_Save"), GTK_RESPONSE_ACCEPT,
+                                        NULL);
+  filename = g_strdup_printf ("%s.node", gsk_render_node_get_name (node) ? gsk_render_node_get_name (node)
+                                                                         : node_type_name (gsk_render_node_get_node_type (node)));
+  gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (dialog), filename);
+  g_free (filename);
+  gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_ACCEPT);
+  gtk_window_set_modal (GTK_WINDOW (dialog), TRUE);
+  gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (dialog), TRUE);
+  g_signal_connect (dialog, "response", G_CALLBACK (render_node_save_response), node);
+  gtk_widget_show (dialog);
+}
+
 static char *
 format_timespan (gint64 timespan)
 {
@@ -394,11 +475,13 @@ gtk_inspector_recorder_class_init (GtkInspectorRecorderClass *klass)
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorRecorder, recordings_list);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorRecorder, render_node_view);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorRecorder, render_node_tree);
+  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorRecorder, render_node_save_button);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorRecorder, node_property_tree);
 
   gtk_widget_class_bind_template_callback (widget_class, recordings_clear_all);
   gtk_widget_class_bind_template_callback (widget_class, recordings_list_row_selected);
   gtk_widget_class_bind_template_callback (widget_class, render_node_list_selection_changed);
+  gtk_widget_class_bind_template_callback (widget_class, render_node_save);
 }
 
 static void

gtk/inspector/recorder.ui

@@ -33,6 +33,18 @@
                 <property name="stack">render_stack</property>
               </object>
             </child>
+            <child>
+              <object class="GtkButton" id="render_node_save_button">
+                <property name="visible">1</property>
+                <property name="relief">none</property>
+                <property name="sensitive">0</property>
+                <property name="icon-name">document-save-as-symbolic</property>
+                <signal name="clicked" handler="render_node_save"/>
+              </object>
+              <packing>
+                <property name="pack-type">end</property>
+              </packing>
+            </child>
           </object>
         </child>
         <child>

tests/Makefile.am

@@ -27,6 +27,7 @@ fontconfig_programs = testfontchooserdialog
 endif
 
 noinst_PROGRAMS =  $(TEST_PROGS)	\
+	rendernode			\
 	overlayscroll			\
 	syncscroll			\
 	animated-resizing		\
@@ -161,6 +162,7 @@ if USE_X11
 noinst_PROGRAMS += testerrors
 endif
 
+rendernode_DEPENDENCIES = $(TEST_DEPS)
 animated_resizing_DEPENDENCIES = $(TEST_DEPS)
 animated_revealing_DEPENDENCIES = $(TEST_DEPS)
 flicker_DEPENDENCIES = $(TEST_DEPS)

tests/rendernode.c

@@ -0,0 +1,68 @@
+#include <gtk/gtk.h>
+
+static GOptionEntry options[] = {
+  { NULL }
+};
+
+int
+main(int argc, char **argv)
+{
+  graphene_rect_t bounds;
+  cairo_surface_t *surface;
+  GskRenderNode *node;
+  cairo_t *cr;
+  GError *error = NULL;
+  GBytes *bytes;
+  char *contents;
+  gsize len;
+
+  if (!gtk_init_with_args (&argc, &argv, "NODE-FILE PNG-FILE",
+                           options, NULL, &error))
+    {
+      g_printerr ("Option parsing failed: %s\n", error->message);
+      return 1;
+    }
+
+  if (argc != 3)
+    {
+      g_printerr ("Usage: %s [OPTIONS] NODE-FILE PNG-FILE\n", argv[0]);
+      return 1;
+    }
+
+  if (!g_file_get_contents (argv[1], &contents, &len, &error))
+    {
+      g_printerr ("Could not open node file: %s\n", error->message);
+      return 1;
+    }
+
+  bytes = g_bytes_new_take (contents, len);
+  node = gsk_render_node_deserialize (bytes);
+  g_bytes_unref (bytes);
+
+  if (node == NULL)
+    {
+      g_printerr ("Invalid node file.\n");
+      return 1;
+    }
+
+  gsk_render_node_get_bounds (node, &bounds);
+  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, ceil (bounds.size.width), ceil (bounds.size.height));
+  cr = cairo_create (surface);
+
+  cairo_translate (cr, - bounds.origin.x, - bounds.origin.y);
+  gsk_render_node_draw (node, cr);
+
+  cairo_destroy (cr);
+  gsk_render_node_unref (node);
+
+  if (cairo_surface_write_to_png (surface, argv[2]))
+    {
+      cairo_surface_destroy (surface);
+      g_print ("Failed to save PNG file.\n");
+      return 1;
+    }
+
+  cairo_surface_destroy (surface);
+
+  return 0;
+}