[gtk] snapshot: Repeat color nodes by creating a larger color node

[Timm Bäder <baedert src gnome org>]

commit 4788f8884005158e8c1328d7eced1b61ba0302e3
Author: Timm Bäder <mail baedert org>
Date:   Thu Dec 19 09:15:13 2019 +0100

    snapshot: Repeat color nodes by creating a larger color node

 gtk/gtksnapshot.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtksnapshot.c b/gtk/gtksnapshot.c
index a7f55e6bbb..c87ba493f9 100644
--- a/gtk/gtksnapshot.c
+++ b/gtk/gtksnapshot.c
@@ -547,13 +547,25 @@ gtk_snapshot_collect_repeat (GtkSnapshot      *snapshot,
                              guint             n_nodes)
 {
   GskRenderNode *node, *repeat_node;
-  graphene_rect_t *bounds = &state->data.repeat.bounds;
-  graphene_rect_t *child_bounds = &state->data.repeat.child_bounds;
+  const graphene_rect_t *bounds = &state->data.repeat.bounds;
+  const graphene_rect_t *child_bounds = &state->data.repeat.child_bounds;
 
   node = gtk_snapshot_collect_default (snapshot, state, nodes, n_nodes);
   if (node == NULL)
     return NULL;
 
+  if (gsk_render_node_get_node_type (node) == GSK_COLOR_NODE &&
+      graphene_rect_equal (child_bounds, &node->bounds))
+    {
+      /* Repeating a color node entirely is pretty easy by just increasing
+       * the size of the color node. */
+      GskRenderNode *color_node = gsk_color_node_new (gsk_color_node_peek_color (node), bounds);
+
+      gsk_render_node_unref (node);
+
+      return color_node;
+    }
+
   repeat_node = gsk_repeat_node_new (bounds,
                                      node,
                                      child_bounds->size.width > 0 ? child_bounds : NULL);