gsk: Add gsk_renderer_render_texture()

... and implement it for the Cairo renderer.

It's an API that instructs a renderer to render to a texture.
So far this is mostly meant to be used for testing, but I could imagine
it being useful for rendering DND icons.

1 files changed, 3 insertions, 0 deletions

diff --git a/gsk/gskrendererprivate.h b/gsk/gskrendererprivate.h
index cad512782f..d9dbe9eca0 100644
--- a/gsk/gskrendererprivate.h
+++ b/gsk/gskrendererprivate.h
@@ -42,6 +42,9 @@ struct _GskRendererClass
                         GError **error);
   void (* unrealize) (GskRenderer *renderer);
 
+  GskTexture * (* render_texture) (GskRenderer           *renderer,
+                                   GskRenderNode         *root,
+                                   const graphene_rect_t *viewport);
   GdkDrawingContext * (* begin_draw_frame) (GskRenderer *renderer,
                                             const cairo_region_t *region);
   void (* end_draw_frame) (GskRenderer *renderer,