snapshot: Implement gtk_snapshot_clips_rect()

And use this to cull widgets and gadgets that are completely outside the
clip region.

A potential optimization is to apply this clip region to cairo contexts
created with gtk_snapshot_append_cairo_node(), but for that we'd need to
apply the inverse matrix to the clip region, and that causes rounding
errors.

Plus, I hope that cairo drawing becomes exceedingly rare so it won't be
used for the whole widget factory like today (which might also explain
why no culling happens in the widget factory outside the header bar.

1 files changed, 2 insertions, 0 deletions

diff --git a/gtk/gtksnapshotprivate.h b/gtk/gtksnapshotprivate.h
index c9899d004f..ff9d1b62c0 100644
--- a/gtk/gtksnapshotprivate.h
+++ b/gtk/gtksnapshotprivate.h
@@ -30,6 +30,8 @@ struct _GtkSnapshotState {
   GskRenderNode         *node;
 
   graphene_matrix_t      transform;
+  graphene_matrix_t      world_transform;
+  guint                  world_is_valid : 1;
 };
 
 struct _GtkSnapshot {