[gtk+] Add a cross-fade node ref test

[Matthias Clasen <matthiasc src gnome org>]

commit 87aaa5685b8e5dc755415a4c84c07c5cf456114e
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 8 14:36:35 2017 -0400

    Add a cross-fade node ref test
    
    The Vulkan renderer doesn't pass this one either, currently.

 testsuite/gsk/cross-fade.node     |  Bin 0 -> 640324 bytes
 testsuite/gsk/cross-fade.png      |  Bin 0 -> 1972 bytes
 testsuite/gsk/test-render-nodes.c |   26 ++++++++++++++++++++++++++
 3 files changed, 26 insertions(+), 0 deletions(-)
---
diff --git a/testsuite/gsk/cross-fade.node b/testsuite/gsk/cross-fade.node
new file mode 100644
index 0000000..beaa2c6
Binary files /dev/null and b/testsuite/gsk/cross-fade.node differ
diff --git a/testsuite/gsk/cross-fade.png b/testsuite/gsk/cross-fade.png
new file mode 100644
index 0000000..8401b23
Binary files /dev/null and b/testsuite/gsk/cross-fade.png differ
diff --git a/testsuite/gsk/test-render-nodes.c b/testsuite/gsk/test-render-nodes.c
index f3d65f4..fc29d32 100644
--- a/testsuite/gsk/test-render-nodes.c
+++ b/testsuite/gsk/test-render-nodes.c
@@ -258,6 +258,31 @@ blendmode (void)
   return container;
 }
 
+static GskRenderNode *
+cross_fade (void)
+{
+  GskRenderNode *child1;
+  GskRenderNode *child2;
+  GskRenderNode *transform;
+  GskRenderNode *container;
+  graphene_matrix_t matrix;
+
+  child1 = cairo ();
+  child2 = cairo2 ();
+
+  graphene_matrix_init_translate (&matrix, &(const graphene_point3d_t) { 50, 50, 0 });
+  transform = gsk_transform_node_new (child2, &matrix);
+  gsk_render_node_unref (child2);
+  child2 = transform;
+
+  container = gsk_cross_fade_node_new (child1, child2, 0.5);
+
+  gsk_render_node_unref (child1);
+  gsk_render_node_unref (child2);
+
+  return container;
+}
+
 static const struct {
   const char *name;
   GskRenderNode * (* func) (void);
@@ -266,6 +291,7 @@ static const struct {
   { "cairo.node", cairo },
   { "repeat.node", repeat },
   { "blendmode.node", blendmode },
+  { "cross-fade.node", cross_fade },
 };
 
 /*** test setup ***/