From: Benjamin Otte <otte@redhat.com>
Date: Mon, 1 May 2023 20:23:50 +0000 (+0200)
Subject: rendernode: Implement texture diffing for scale nodes
X-Git-Tag: archive/raspbian/4.12.3+ds-1+rpi1~1^2^2^2~22^2~1^2~301^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=e4040adbe7dbec82962699f654802d17ca77e4fd;p=gtk4.git

rendernode: Implement texture diffing for scale nodes
---

diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index a0b6fd9b2f..90ef6fd13f 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -1844,13 +1844,29 @@ gsk_texture_scale_node_diff (GskRenderNode  *node1,
 {
   GskTextureScaleNode *self1 = (GskTextureScaleNode *) node1;
   GskTextureScaleNode *self2 = (GskTextureScaleNode *) node2;
+  cairo_region_t *sub;
 
-  if (graphene_rect_equal (&node1->bounds, &node2->bounds) &&
-      self1->texture == self2->texture &&
-      self1->filter == self2->filter)
+  if (!graphene_rect_equal (&node1->bounds, &node2->bounds) ||
+      self1->filter != self2->filter ||
+      gdk_texture_get_width (self1->texture) != gdk_texture_get_width (self2->texture) ||
+      gdk_texture_get_height (self1->texture) != gdk_texture_get_height (self2->texture))
+    {
+      gsk_render_node_diff_impossible (node1, node2, region);
+      return;
+    }
+
+  if (self1->texture == self2->texture)
     return;
 
-  gsk_render_node_diff_impossible (node1, node2, region);
+  sub = cairo_region_create ();
+  gdk_texture_diff (self1->texture, self2->texture, sub);
+  region_union_region_affine (region,
+                              sub,
+                              node1->bounds.size.width / gdk_texture_get_width (self1->texture),
+                              node1->bounds.size.height / gdk_texture_get_height (self1->texture),
+                              node1->bounds.origin.x,
+                              node1->bounds.origin.y);
+  cairo_region_destroy (sub);
 }
 
 static void