[gtk+] Allow backend-specific reference images

[Matthias Clasen <matthiasc src gnome org>]

commit 95f29de71016b8e2780ce129847e423ae172172c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 8 11:24:37 2017 -0400

    Allow backend-specific reference images
    
    This is not ideal, but lets us deal with differences for now.

 testsuite/gsk/colors.cairo.png                  |  Bin 0 -> 77248 bytes
 testsuite/gsk/{colors.png => colors.vulkan.png} |  Bin 77366 -> 77366 bytes
 testsuite/gsk/test-render-nodes.c               |   28 +++++++++++++++++++---
 3 files changed, 24 insertions(+), 4 deletions(-)
---
diff --git a/testsuite/gsk/colors.cairo.png b/testsuite/gsk/colors.cairo.png
new file mode 100644
index 0000000..59bd0eb
Binary files /dev/null and b/testsuite/gsk/colors.cairo.png differ
diff --git a/testsuite/gsk/test-render-nodes.c b/testsuite/gsk/test-render-nodes.c
index 3b7305b..d9d937e 100644
--- a/testsuite/gsk/test-render-nodes.c
+++ b/testsuite/gsk/test-render-nodes.c
@@ -180,6 +180,7 @@ load_node_file (GFile *file, gboolean generate)
   char *png_file;
   cairo_surface_t *ref_surface;
   cairo_surface_t *diff_surface;
+  const char *ext;
 
   node_file = g_file_get_path (file);
 
@@ -214,28 +215,47 @@ load_node_file (GFile *file, gboolean generate)
                         cairo_image_surface_get_stride (surface));
   cairo_surface_mark_dirty (surface);
 
+  if (strcmp (G_OBJECT_TYPE_NAME (renderer), "GskVulkanRenderer") == 0)
+    ext = ".vulkan.png";
+  else if (strcmp (G_OBJECT_TYPE_NAME (renderer), "GskGLRenderer") == 0)
+    ext = ".gl.png";
+  else if (strcmp (G_OBJECT_TYPE_NAME (renderer), "GskCairoRenderer") == 0)
+    ext = ".cairo.png";
+  else
+    ext = ".png";
+
   g_object_unref (texture);
   g_object_unref (window);
   g_object_unref (renderer);
+  gdk_window_destroy (window);
 
   gsk_render_node_unref (node);
 
-  png_file = file_replace_extension (node_file, ".node", ".png");
-
   if (generate)
     {
       cairo_status_t status;
+      char *out_file;
+
+      out_file = file_replace_extension (node_file, ".node", ".png");
 
-      status = cairo_surface_write_to_png (surface, png_file);
+      status = cairo_surface_write_to_png (surface, out_file);
       cairo_surface_destroy (surface);
       if (status != CAIRO_STATUS_SUCCESS)
         {
-          g_print ("Failed to safe png file: %s\n", cairo_status_to_string (status));
+          g_print ("Failed to save png file %s: %s\n", out_file, cairo_status_to_string (status));
           exit (1);
         }
+      g_free (out_file);
       return;
     }
 
+  png_file = file_replace_extension (node_file, ".node", ext);
+  if (!g_file_test (png_file, G_FILE_TEST_EXISTS))
+    {
+      g_free (png_file);
+      png_file = file_replace_extension (node_file, ".node", ".png");
+    }
+
   ref_surface = cairo_image_surface_create_from_png (png_file);
   diff_surface = reftest_compare_surfaces (surface, ref_surface);