[gtk/wip/baedert/for-master: 40/40] Implement diff() for color matrix nodes

[Timm Bäder <baedert src gnome org>]

commit 5ccc5a6085676532f7d501859933004bb7d8ca4c
Author: Timm Bäder <mail baedert org>
Date:   Wed May 13 16:26:35 2020 +0200

    Implement diff() for color matrix nodes
    
    This way we don't redraw color matrix nodes all the time.

 gsk/gskrendernodeimpl.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)
---
diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index 767e7f87c7..5fa0dbc46a 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -2331,6 +2331,28 @@ gsk_color_matrix_node_draw (GskRenderNode *node,
   cairo_pattern_destroy (pattern);
 }
 
+static void
+gsk_color_matrix_node_diff (GskRenderNode  *node1,
+                            GskRenderNode  *node2,
+                            cairo_region_t *region)
+{
+  GskColorMatrixNode *self1 = (GskColorMatrixNode *) node1;
+  GskColorMatrixNode *self2 = (GskColorMatrixNode *) node2;
+
+  if (!graphene_vec4_equal (&self1->color_offset, &self2->color_offset))
+    goto nope;
+
+  if (!graphene_matrix_equal_fast (&self1->color_matrix, &self2->color_matrix))
+    goto nope;
+
+  gsk_render_node_diff (self1->child, self2->child, region);
+  return;
+
+nope:
+  gsk_render_node_diff_impossible (node1, node2, region);
+  return;
+}
+
 /**
  * gsk_color_matrix_node_new: 
  * @child: The node to draw
@@ -4311,7 +4333,7 @@ gsk_render_node_init_types_once (void)
       gsk_color_matrix_node_finalize,
       gsk_color_matrix_node_draw,
       NULL,
-      NULL,
+      gsk_color_matrix_node_diff,
     };
 
     GType node_type = gsk_render_node_type_register_static (I_("GskColorMatrixNode"), &node_info);