[gtk+] Add a basic cairo node test

[Matthias Clasen <matthiasc src gnome org>]

commit df549c4e9f9de34eb4de404f46edee0521cf35c6
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 8 11:51:00 2017 -0400

    Add a basic cairo node test

 testsuite/gsk/cairo.node          |  Bin 0 -> 480079 bytes
 testsuite/gsk/cairo.png           |  Bin 0 -> 1614 bytes
 testsuite/gsk/test-render-nodes.c |   29 +++++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 0 deletions(-)
---
diff --git a/testsuite/gsk/cairo.node b/testsuite/gsk/cairo.node
new file mode 100644
index 0000000..fbddbf3
Binary files /dev/null and b/testsuite/gsk/cairo.node differ
diff --git a/testsuite/gsk/cairo.png b/testsuite/gsk/cairo.png
new file mode 100644
index 0000000..65b25cb
Binary files /dev/null and b/testsuite/gsk/cairo.png differ
diff --git a/testsuite/gsk/test-render-nodes.c b/testsuite/gsk/test-render-nodes.c
index d9d937e..67f7e30 100644
--- a/testsuite/gsk/test-render-nodes.c
+++ b/testsuite/gsk/test-render-nodes.c
@@ -126,11 +126,40 @@ colors (void)
   return container;
 }
 
+static GskRenderNode *
+cairo (void)
+{
+  GskRenderNode *node;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+
+  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 200, 600);
+  cr = cairo_create (surface);
+
+  cairo_set_source_rgb (cr, 1, 0, 0);
+  cairo_rectangle (cr, 0, 0, 200, 200);
+  cairo_fill (cr);
+  cairo_set_source_rgb (cr, 0, 1, 0);
+  cairo_rectangle (cr, 0, 200, 200, 200);
+  cairo_fill (cr);
+  cairo_set_source_rgb (cr, 0, 0, 1);
+  cairo_rectangle (cr, 0, 400, 200, 200);
+  cairo_fill (cr);
+
+  node = gsk_cairo_node_new_for_surface (&GRAPHENE_RECT_INIT (0, 0, 200, 600), surface);
+
+  cairo_destroy (cr);
+  cairo_surface_destroy (surface);
+
+  return node;
+}
+
 static const struct {
   const char *name;
   GskRenderNode * (* func) (void);
 } functions[] = {
   { "colors.node", colors },
+  { "cairo.node", cairo },
 };
 
 /*** test setup ***/