Revise gsk_path_foreach

Make this struct-based.

demos/gtk-demo/path_text.c

@@ -104,20 +104,19 @@ gtk_path_transform_point (GskPathMeasure         *measure,
 }
 
 static gboolean
-gtk_path_transform_op (GskPathOperation        op,
-                       const graphene_point_t *pts,
-                       gsize                   n_pts,
-                       float                   weight,
+gtk_path_transform_op (const graphene_point_t *start,
+                       const graphene_point_t *end,
+                       const GskPathControl   *control,
                        gpointer                data)
 {
   GtkPathTransform *transform = data;
 
-  switch (op)
+  switch (control->op)
   {
     case GSK_PATH_MOVE:
       {
         graphene_point_t res;
-        gtk_path_transform_point (transform->measure, &pts[0], &transform->offset, transform->scale, &res);
+        gtk_path_transform_point (transform->measure, end, &transform->offset, transform->scale, &res);
         gsk_path_builder_move_to (transform->builder, res.x, res.y);
       }
       break;
@@ -125,7 +124,7 @@ gtk_path_transform_op (GskPathOperation        op,
     case GSK_PATH_LINE:
       {
         graphene_point_t res;
-        gtk_path_transform_point (transform->measure, &pts[1], &transform->offset, transform->scale, &res);
+        gtk_path_transform_point (transform->measure, end, &transform->offset, transform->scale, &res);
         gsk_path_builder_line_to (transform->builder, res.x, res.y);
       }
       break;
@@ -133,8 +132,8 @@ gtk_path_transform_op (GskPathOperation        op,
     case GSK_PATH_QUAD:
       {
         graphene_point_t res[2];
-        gtk_path_transform_point (transform->measure, &pts[1], &transform->offset, transform->scale, &res[0]);
-        gtk_path_transform_point (transform->measure, &pts[2], &transform->offset, transform->scale, &res[1]);
+        gtk_path_transform_point (transform->measure, &control->quad.control, &transform->offset, transform->scale, &res[0]);
+        gtk_path_transform_point (transform->measure, end, &transform->offset, transform->scale, &res[1]);
         gsk_path_builder_quad_to (transform->builder, res[0].x, res[0].y, res[1].x, res[1].y);
       }
       break;
@@ -142,9 +141,9 @@ gtk_path_transform_op (GskPathOperation        op,
     case GSK_PATH_CUBIC:
       {
         graphene_point_t res[3];
-        gtk_path_transform_point (transform->measure, &pts[1], &transform->offset, transform->scale, &res[0]);
-        gtk_path_transform_point (transform->measure, &pts[2], &transform->offset, transform->scale, &res[1]);
-        gtk_path_transform_point (transform->measure, &pts[3], &transform->offset, transform->scale, &res[2]);
+        gtk_path_transform_point (transform->measure, &control->cubic.control1, &transform->offset, transform->scale, &res[0]);
+        gtk_path_transform_point (transform->measure, &control->cubic.control2, &transform->offset, transform->scale, &res[1]);
+        gtk_path_transform_point (transform->measure, end, &transform->offset, transform->scale, &res[2]);
         gsk_path_builder_cubic_to (transform->builder, res[0].x, res[0].y, res[1].x, res[1].y, res[2].x, res[2].y);
       }
       break;
@@ -152,9 +151,9 @@ gtk_path_transform_op (GskPathOperation        op,
     case GSK_PATH_CONIC:
       {
         graphene_point_t res[2];
-        gtk_path_transform_point (transform->measure, &pts[1], &transform->offset, transform->scale, &res[0]);
-        gtk_path_transform_point (transform->measure, &pts[3], &transform->offset, transform->scale, &res[1]);
-        gsk_path_builder_conic_to (transform->builder, res[0].x, res[0].y, res[1].x, res[1].y, weight);
+        gtk_path_transform_point (transform->measure, &control->conic.control, &transform->offset, transform->scale, &res[0]);
+        gtk_path_transform_point (transform->measure, end, &transform->offset, transform->scale, &res[1]);
+        gsk_path_builder_conic_to (transform->builder, res[0].x, res[0].y, res[1].x, res[1].y, control->conic.weight);
       }
       break;
 

gsk/gskcurve.c

@@ -381,7 +381,10 @@ gsk_line_curve_decompose_curve (const GskCurve       *curve,
 {
   const GskLineCurve *self = &curve->line;
 
-  return add_curve_func (GSK_PATH_LINE, self->points, 2, 0.f, user_data);
+  return add_curve_func (&self->points[0],
+                         &self->points[1],
+                         &(GskPathControl) { .op = GSK_PATH_LINE },
+                         user_data);
 }
 
 static void
@@ -705,9 +708,10 @@ gsk_curve_add_line_cb (const graphene_point_t *from,
                        gpointer                user_data)
 {
   AddLineData *data = user_data;
-  graphene_point_t p[2] = { *from, *to };
 
-  return data->add_curve (GSK_PATH_LINE, p, 2, 0.f, data->user_data);
+  return data->add_curve (from, to,
+                          &(GskPathControl) { .op = GSK_PATH_LINE },
+                          data->user_data);
 }
 
 static gboolean
@@ -720,13 +724,30 @@ gsk_quad_curve_decompose_curve (const GskCurve       *curve,
   const GskQuadCurve *self = &curve->quad;
 
   if (flags & GSK_PATH_FOREACH_ALLOW_QUAD)
-    return add_curve_func (GSK_PATH_QUAD, self->points, 3, 0.f, user_data);
+    return add_curve_func (&self->points[0],
+                           &self->points[2],
+                           &(GskPathControl) {
+                             .op = GSK_PATH_QUAD,
+                             .quad = (GskQuadControl) {
+                               .control = self->points[1],
+                             },
+                           },
+                           user_data);
   else if (flags & GSK_PATH_FOREACH_ALLOW_CUBIC)
     {
       GskCurve c;
 
       gsk_curve_elevate (curve, &c);
-      return add_curve_func (GSK_PATH_CUBIC, c.cubic.points, 4, 0.f, user_data);
+      return add_curve_func (&c.cubic.points[0],
+                             &c.cubic.points[3],
+                             &(GskPathControl) {
+                               .op = GSK_PATH_CUBIC,
+                               .cubic = (GskCubicControl) {
+                                 .control1 = c.cubic.points[1],
+                                 .control2 = c.cubic.points[2],
+                               },
+                             },
+                             user_data);
     }
   else
     {
@@ -1180,7 +1201,16 @@ gsk_cubic_curve_decompose_curve (const GskCurve       *curve,
   const GskCubicCurve *self = &curve->cubic;
 
   if (flags & GSK_PATH_FOREACH_ALLOW_CUBIC)
-    return add_curve_func (GSK_PATH_CUBIC, self->points, 4, 0.f, user_data);
+    return add_curve_func (&self->points[0],
+                           &self->points[3],
+                           &(GskPathControl) {
+                             .op = GSK_PATH_CUBIC,
+                             .cubic = (GskCubicControl) {
+                               .control1 = self->points[1],
+                               .control2 = self->points[2],
+                             },
+                           },
+                           user_data);
 
   /* FIXME: Quadratic or arc approximation */
   return gsk_cubic_curve_decompose (curve,
@@ -1854,7 +1884,16 @@ gsk_conic_curve_decompose_or_add (const GskCurve       *curve,
                                   gpointer              user_data)
 {
   if (gsk_conic_is_close_to_cubic (curve, cubic, tolerance))
-    return add_curve_func (GSK_PATH_CUBIC, cubic->cubic.points, 4, 0.f, user_data);
+    return add_curve_func (&cubic->cubic.points[0],
+                           &cubic->cubic.points[3],
+                           &(GskPathControl) {
+                             .op = GSK_PATH_CUBIC,
+                             .cubic = (GskCubicControl) {
+                               .control1 = cubic->cubic.points[1],
+                               .control2 = cubic->cubic.points[2],
+                             },
+                           },
+                           user_data);
   else
     {
       GskCurve c1, c2;
@@ -1881,13 +1920,16 @@ gsk_conic_curve_decompose_curve (const GskCurve       *curve,
   GskCurve c;
 
   if (flags & GSK_PATH_FOREACH_ALLOW_CONIC)
-    return add_curve_func (GSK_PATH_CONIC,
-                           (const graphene_point_t[3]) { self->points[0],
-                                                         self->points[1],
-                                                         self->points[3] },
-                            3,
-                            self->points[2].x,
-                            user_data);
+    return add_curve_func (&self->points[0],
+                           &self->points[3],
+                           &(GskPathControl) {
+                             .op = GSK_PATH_CONIC,
+                             .conic = (GskConicControl) {
+                               .control = self->points[1],
+                               .weight = self->points[2].x
+                             },
+                           },
+                           user_data);
 
   if (flags & GSK_PATH_FOREACH_ALLOW_CUBIC)
     {

gsk/gskcurveprivate.h

@@ -102,10 +102,9 @@ typedef gboolean (* GskCurveAddLineFunc) (const graphene_point_t *from,
                                           GskCurveLineReason      reason,
                                           gpointer                user_data);
 
-typedef gboolean (* GskCurveAddCurveFunc) (GskPathOperation        op,
-                                           const graphene_point_t *pts,
-                                           gsize                   n_pts,
-                                           float                   weight,
+typedef gboolean (* GskCurveAddCurveFunc) (const graphene_point_t *start,
+                                           const graphene_point_t *end,
+                                           const GskPathControl   *control,
                                            gpointer                user_data);
 
 void                    gsk_curve_init                          (GskCurve               *curve,

gsk/gskpath.c

@@ -231,16 +231,15 @@ gsk_path_to_string (GskPath *self)
 }
 
 static gboolean
-gsk_path_to_cairo_add_op (GskPathOperation        op,
-                          const graphene_point_t *pts,
-                          gsize                   n_pts,
-                          float                   weight,
+gsk_path_to_cairo_add_op (const graphene_point_t *start,
+                          const graphene_point_t *end,
+                          const GskPathControl   *control,
                           gpointer                cr)
 {
-  switch (op)
+  switch (control->op)
   {
     case GSK_PATH_MOVE:
-      cairo_move_to (cr, pts[0].x, pts[0].y);
+      cairo_move_to (cr, end->x, end->y);
       break;
 
     case GSK_PATH_CLOSE:
@@ -248,11 +247,13 @@ gsk_path_to_cairo_add_op (GskPathOperation        op,
       break;
 
     case GSK_PATH_LINE:
-      cairo_line_to (cr, pts[1].x, pts[1].y);
+      cairo_line_to (cr, end->x, end->y);
       break;
 
     case GSK_PATH_CUBIC:
-      cairo_curve_to (cr, pts[1].x, pts[1].y, pts[2].x, pts[2].y, pts[3].x, pts[3].y);
+      cairo_curve_to (cr, control->cubic.control1.x, control->cubic.control1.y,
+                          control->cubic.control2.x, control->cubic.control2.y,
+                          end->x, end->y);
       break;
 
     case GSK_PATH_QUAD:
@@ -668,64 +669,65 @@ gsk_path_foreach_trampoline_add_line (const graphene_point_t *from,
 {
   GskPathForeachTrampoline *trampoline = data;
 
-  return trampoline->func (GSK_PATH_LINE,
-                           (graphene_point_t[2]) { *from, *to },
-                           2,
-                           0.f,
+  return trampoline->func (from, to,
+                           &(GskPathControl) { GSK_PATH_LINE, },
                            trampoline->user_data);
 }
 
 static gboolean
-gsk_path_foreach_trampoline_add_curve (GskPathOperation        op,
-                                       const graphene_point_t *pts,
-                                       gsize                   n_pts,
-                                       float                   weight,
+gsk_path_foreach_trampoline_add_curve (const graphene_point_t *start,
+                                       const graphene_point_t *end,
+                                       const GskPathControl   *control,
                                        gpointer                data)
 {
   GskPathForeachTrampoline *trampoline = data;
 
-  return trampoline->func (op, pts, n_pts, weight, trampoline->user_data);
+  return trampoline->func (start, end, control, trampoline->user_data);
 }
 
 static gboolean
-gsk_path_foreach_trampoline (GskPathOperation        op,
-                             const graphene_point_t *pts,
-                             gsize                   n_pts,
-                             float                   weight,
+gsk_path_foreach_trampoline (const graphene_point_t *start,
+                             const graphene_point_t *end,
+                             const GskPathControl   *control,
                              gpointer                data)
 {
   GskPathForeachTrampoline *trampoline = data;
 
-  switch (op)
+  switch (control->op)
     {
     case GSK_PATH_MOVE:
     case GSK_PATH_CLOSE:
     case GSK_PATH_LINE:
-      return trampoline->func (op, pts, n_pts, weight, trampoline->user_data);
+      return trampoline->func (start, end, control, trampoline->user_data);
 
     case GSK_PATH_QUAD:
       {
         GskCurve curve;
 
         if (trampoline->flags & GSK_PATH_FOREACH_ALLOW_QUAD)
-          return trampoline->func (op, pts, n_pts, weight, trampoline->user_data);
+          return trampoline->func (start, end, control, trampoline->user_data);
         else if (trampoline->flags & GSK_PATH_FOREACH_ALLOW_CUBIC)
           {
-            return trampoline->func (GSK_PATH_CUBIC,
-                                     (graphene_point_t[4]) {
-                                       pts[0],
-                                       GRAPHENE_POINT_INIT ((pts[0].x + 2 * pts[1].x) / 3,
-                                                            (pts[0].y + 2 * pts[1].y) / 3),
-                                       GRAPHENE_POINT_INIT ((pts[2].x + 2 * pts[1].x) / 3,
-                                                            (pts[2].y + 2 * pts[1].y) / 3),
-                                       pts[2],
+            return trampoline->func (start,
+                                     end,
+                                     &(GskPathControl) {
+                                       .op = GSK_PATH_CUBIC,
+                                       .cubic = (GskCubicControl) {
+                                         .control1 = GRAPHENE_POINT_INIT ((start->x + 2 * control->quad.control.x) / 3,
+                                                                          (start->y + 2 * control->quad.control.y) / 3),
+                                         .control2 = GRAPHENE_POINT_INIT ((end->x + 2 * control->quad.control.x) / 3,
+                                                                          (end->y + 2 * control->quad.control.y) / 3),
+                                       },
                                      },
-                                     4,
-                                     weight,
                                      trampoline->user_data);
           }
 
-        gsk_curve_init (&curve, gsk_pathop_encode (GSK_PATH_QUAD, pts));
+        gsk_curve_init (&curve, gsk_pathop_encode (GSK_PATH_QUAD,
+                                                   (graphene_point_t[3]) {
+                                                     *start,
+                                                     control->quad.control,
+                                                     *end,
+                                                   } ));
         return gsk_curve_decompose (&curve,
                                     trampoline->tolerance,
                                     gsk_path_foreach_trampoline_add_line,
@@ -737,9 +739,15 @@ gsk_path_foreach_trampoline (GskPathOperation        op,
         GskCurve curve;
 
         if (trampoline->flags & GSK_PATH_FOREACH_ALLOW_CUBIC)
-          return trampoline->func (op, pts, n_pts, weight, trampoline->user_data);
+          return trampoline->func (start, end, control, trampoline->user_data);
 
-        gsk_curve_init (&curve, gsk_pathop_encode (GSK_PATH_CUBIC, pts));
+        gsk_curve_init (&curve, gsk_pathop_encode (GSK_PATH_CUBIC,
+                                                   (const graphene_point_t[4]) {
+                                                     *start,
+                                                     control->cubic.control1,
+                                                     control->cubic.control2,
+                                                     *end,
+                                                   }));
         if (trampoline->flags & (GSK_PATH_FOREACH_ALLOW_QUAD|GSK_PATH_FOREACH_ALLOW_CONIC))
           return gsk_curve_decompose_curve (&curve,
                                             trampoline->flags,
@@ -758,9 +766,15 @@ gsk_path_foreach_trampoline (GskPathOperation        op,
         GskCurve curve;
 
         if (trampoline->flags & GSK_PATH_FOREACH_ALLOW_CONIC)
-          return trampoline->func (op, pts, n_pts, weight, trampoline->user_data);
+          return trampoline->func (start, end, control, trampoline->user_data);
 
-        gsk_curve_init (&curve, gsk_pathop_encode (GSK_PATH_CONIC, (graphene_point_t[4]) { pts[0], pts[1], { weight, 0.f }, pts[2] } ));
+        gsk_curve_init (&curve, gsk_pathop_encode (GSK_PATH_CONIC,
+                                                   (graphene_point_t[4]) {
+                                                     *start,
+                                                     control->conic.control,
+                                                     { control->conic.weight, 0.f },
+                                                     *end
+                                                   } ));
         if (trampoline->flags & (GSK_PATH_FOREACH_ALLOW_QUAD|GSK_PATH_FOREACH_ALLOW_CUBIC))
           return gsk_curve_decompose_curve (&curve,
                                             trampoline->flags,

gsk/gskpath.h

@@ -53,21 +53,50 @@ typedef enum
   GSK_PATH_FOREACH_ALLOW_CONIC      = (1 << 2),
 } GskPathForeachFlags;
 
+typedef struct _GskQuadControl GskQuadControl;
+struct _GskQuadControl
+{
+  graphene_point_t control;
+};
+
+typedef struct _GskCubicControl GskCubicControl;
+struct _GskCubicControl
+{
+  graphene_point_t control1;
+  graphene_point_t control2;
+};
+
+typedef struct _GskConicControl GskConicControl;
+struct _GskConicControl
+{
+  graphene_point_t control;
+  float weight;
+};
+
+typedef struct _GskPathControl GskPathControl;
+struct _GskPathControl
+{
+  GskPathOperation op;
+
+  union {
+    GskQuadControl quad;
+    GskCubicControl cubic;
+    GskConicControl conic;
+  };
+};
+
 /**
  * GskPathForeachFunc:
- * @op: The operation
- * @pts: The points of the operation
- * @n_pts: The number of points
- * @weight: The weight for conic curves, or unused if not a conic curve
+ * @start: The start point of the operation
+ * @end: The end point of the operation
+ * @control: The control data for the operation
  * @user_data: The user data provided with the function
  *
  * Prototype of the callback to iterate through the operations of
  * a path.
  *
- * For each operation, the callback is given the @op itself, the points
- * that the operation is applied to in @pts, and a @weight for conic
- * curves. The @n_pts argument is somewhat redundant, since the number
- * of points can be inferred from the operation.
+ * For each operation, the callback is given the @op itself, the start-
+ * and endpoint, and the control data, depending on the kind of operation.
  *
  * Each contour of the path starts with a @GSK_PATH_MOVE operation.
  * Closed contours end with a @GSK_PATH_CLOSE operation.
@@ -75,10 +104,9 @@ typedef enum
  * Returns: %TRUE to continue iterating the path, %FALSE to
  *   immediately abort and not call the function again.
  */
-typedef gboolean (* GskPathForeachFunc) (GskPathOperation        op,
-                                         const graphene_point_t *pts,
-                                         gsize                   n_pts,
-                                         float                   weight,
+typedef gboolean (* GskPathForeachFunc) (const graphene_point_t *start,
+                                         const graphene_point_t *end,
+                                         const GskPathControl   *control,
                                          gpointer                user_data);
 
 #define GSK_TYPE_PATH (gsk_path_get_type ())

gsk/gskpathopprivate.h

@@ -89,23 +89,50 @@ gsk_pathop_foreach (gskpathop          pop,
   switch (gsk_pathop_op (pop))
   {
     case GSK_PATH_MOVE:
-      return func (gsk_pathop_op (pop), gsk_pathop_points (pop), 1, 0, user_data);
+      return func (&GRAPHENE_POINT_INIT (0, 0),
+                   &gsk_pathop_points (pop)[0],
+                   &(GskPathControl) { .op = gsk_pathop_op (pop), },
+                   user_data);
 
     case GSK_PATH_CLOSE:
     case GSK_PATH_LINE:
-      return func (gsk_pathop_op (pop), gsk_pathop_points (pop), 2, 0, user_data);
+      return func (&gsk_pathop_points (pop)[0],
+                   &gsk_pathop_points (pop)[1],
+                   &(GskPathControl) { .op = gsk_pathop_op (pop), },
+                   user_data);
 
     case GSK_PATH_QUAD:
-      return func (gsk_pathop_op (pop), gsk_pathop_points (pop), 3, 0, user_data);
+      return func (&gsk_pathop_points (pop)[0],
+                   &gsk_pathop_points (pop)[2],
+                   &(GskPathControl) {
+                     .op = gsk_pathop_op (pop),
+                     .quad = (GskQuadControl) { gsk_pathop_points (pop)[1] }
+                   },
+                   user_data);
 
     case GSK_PATH_CUBIC:
-      return func (gsk_pathop_op (pop), gsk_pathop_points (pop), 4, 0, user_data);
+      return func (&gsk_pathop_points (pop)[0],
+                   &gsk_pathop_points (pop)[3],
+                   &(GskPathControl) {
+                     .op = gsk_pathop_op (pop),
+                     .cubic = (GskCubicControl) {
+                       .control1 = gsk_pathop_points (pop)[1],
+                       .control2 = gsk_pathop_points (pop)[2]
+                     },
+                   },
+                   user_data);
 
     case GSK_PATH_CONIC:
-      {
-        const graphene_point_t *pts = gsk_pathop_points (pop);
-        return func (gsk_pathop_op (pop), (graphene_point_t[3]) { pts[0], pts[1], pts[3] }, 3, pts[2].x, user_data);
-      }
+      return func (&gsk_pathop_points (pop)[0],
+                   &gsk_pathop_points (pop)[3],
+                   &(GskPathControl) {
+                     .op = gsk_pathop_op (pop),
+                     .conic = (GskConicControl) {
+                        .control = gsk_pathop_points (pop)[1],
+                        .weight = gsk_pathop_points (pop)[2].x
+                     },
+                   },
+                   user_data);
 
     default:
       g_assert_not_reached ();

tools/gtk-path-tool-decompose.c

@@ -25,18 +25,17 @@
 #include <glib/gi18n-lib.h>
 
 static gboolean
-foreach_cb (GskPathOperation        op,
-            const graphene_point_t *pts,
-            gsize                   n_pts,
-            float                   weight,
+foreach_cb (const graphene_point_t *start,
+            const graphene_point_t *end,
+            const GskPathControl   *control,
             gpointer                user_data)
 {
   GskPathBuilder *builder = user_data;
 
-  switch (op)
+  switch (control->op)
     {
     case GSK_PATH_MOVE:
-      gsk_path_builder_move_to (builder, pts[0].x, pts[0].y);
+      gsk_path_builder_move_to (builder, end->x, end->y);
       break;
 
     case GSK_PATH_CLOSE:
@@ -44,24 +43,24 @@ foreach_cb (GskPathOperation        op,
       break;
 
     case GSK_PATH_LINE:
-      gsk_path_builder_line_to (builder, pts[1].x, pts[1].y);
+      gsk_path_builder_line_to (builder, end->x, end->y);
       break;
 
     case GSK_PATH_QUAD:
-      gsk_path_builder_quad_to (builder, pts[1].x, pts[1].y,
-                                         pts[2].x, pts[2].y);
+      gsk_path_builder_quad_to (builder, control->quad.control.x, control->quad.control.y,
+                                         end->x, end->y);
       break;
 
     case GSK_PATH_CUBIC:
-      gsk_path_builder_cubic_to (builder, pts[1].x, pts[1].y,
-                                          pts[2].x, pts[2].y,
-                                          pts[3].x, pts[3].y);
+      gsk_path_builder_cubic_to (builder, control->cubic.control1.x, control->cubic.control1.y,
+                                          control->cubic.control2.x, control->cubic.control2.y,
+                                          end->x, end->y);
       break;
 
     case GSK_PATH_CONIC:
-      gsk_path_builder_conic_to (builder, pts[1].x, pts[1].y,
-                                          pts[2].x, pts[2].y,
-                                          weight);
+      gsk_path_builder_conic_to (builder, control->conic.control.x, control->conic.control.y,
+                                          end->x, end->y,
+                                          control->conic.weight);
       break;
 
     default:

tools/gtk-path-tool-info.c

@@ -35,17 +35,16 @@ typedef struct
 } Statistics;
 
 static gboolean
-stats_cb (GskPathOperation        op,
-          const graphene_point_t *pts,
-          gsize                   n_pts,
-          float                   weight,
+stats_cb (const graphene_point_t *start,
+          const graphene_point_t *end,
+          const GskPathControl   *control,
           gpointer                user_data)
 {
   Statistics *stats = user_data;
 
   stats->ops++;
 
-  switch (op)
+  switch (control->op)
     {
     case GSK_PATH_MOVE:
       stats->contours++;