snapshot: Limit cairo nodes to clip region

In certain cases, we might create large cairo nodes, resulting in
surfaces so large, cairo can't handle them. Fix this by limiting the
cairo node to the current clip region.

diff --git a/gtk/gtksnapshot.c b/gtk/gtksnapshot.c
index c9ebf0b5a0dd6b1af6946c4d01ee35525283ff26..420f7b6c87e8e9b1460e3a824fa7e5e14561e6ad 100644 (file)
--- a/gtk/gtksnapshot.c
+++ b/gtk/gtksnapshot.c
@@ -1339,6 +1339,20 @@ gtk_snapshot_append_cairo (GtkSnapshot           *snapshot,
   g_return_val_if_fail (bounds != NULL, NULL);
 
   graphene_rect_offset_r (bounds, current_state->translate_x, current_state->translate_y, &real_bounds);
+
+  if (current_state->clip_region)
+    {
+      cairo_rectangle_int_t clip_extents;
+      cairo_region_get_extents (current_state->clip_region, &clip_extents);
+      graphene_rect_intersection (&GRAPHENE_RECT_INIT (
+                                    clip_extents.x,
+                                    clip_extents.y,
+                                    clip_extents.width,
+                                    clip_extents.height
+                                  ),
+                                  &real_bounds, &real_bounds);
+    }
+
   node = gsk_cairo_node_new (&real_bounds);
 
   if (name && snapshot->record_names)