[gtk+] vulkan: Optimize getting textures

[Benjamin Otte <otte src gnome org>]

commit 2fe01a5b570972d01d33a405cf603736bbb94b97
Author: Benjamin Otte <otte redhat com>
Date:   Sat Dec 31 22:58:15 2016 +0100

    vulkan: Optimize getting textures
    
    When we already have a texture or know we need to upload, just do that
    instead of rendering to Cairo.

 gsk/gskvulkanrenderpass.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/gsk/gskvulkanrenderpass.c b/gsk/gskvulkanrenderpass.c
index b9136bc..68b9e48 100644
--- a/gsk/gskvulkanrenderpass.c
+++ b/gsk/gskvulkanrenderpass.c
@@ -324,6 +324,23 @@ gsk_vulkan_render_pass_get_node_as_texture (GskVulkanRenderPass   *self,
   cairo_surface_t *surface;
   cairo_t *cr;
 
+  if (graphene_rect_equal (bounds, &node->bounds))
+    {
+      switch (gsk_render_node_get_node_type (node))
+        {
+        case GSK_TEXTURE_NODE:
+          return gsk_vulkan_renderer_ref_texture_image (GSK_VULKAN_RENDERER (gsk_vulkan_render_get_renderer 
(render)),
+                                                        gsk_texture_node_get_texture (node),
+                                                        uploader);
+        case GSK_CAIRO_NODE:
+          surface = cairo_surface_reference (gsk_cairo_node_get_surface (node));
+          goto got_surface;
+
+        default:
+          break;
+        }
+    }
+
   /* XXX: We could intersect bounds with clip bounds here */
   surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
                                         ceil (bounds->size.width),
@@ -335,6 +352,7 @@ gsk_vulkan_render_pass_get_node_as_texture (GskVulkanRenderPass   *self,
 
   cairo_destroy (cr);
 
+got_surface:
   result = gsk_vulkan_image_new_from_data (uploader,
                                            cairo_image_surface_get_data (surface),
                                            cairo_image_surface_get_width (surface),