[mutter] cogl: Add API to get the texture from an offscreen

[Jonas Ådahl <jadahl src gnome org>]

commit c498bce9e444c665f239813d3f22b500a526b369
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue May 31 15:44:22 2016 +0800

    cogl: Add API to get the texture from an offscreen
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768976

 cogl/cogl/cogl-framebuffer.c |    6 ++++++
 cogl/cogl/cogl-offscreen.h   |    6 ++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl/cogl-framebuffer.c b/cogl/cogl/cogl-framebuffer.c
index 9dbd2a1..55b9e37 100644
--- a/cogl/cogl/cogl-framebuffer.c
+++ b/cogl/cogl/cogl-framebuffer.c
@@ -705,6 +705,12 @@ cogl_offscreen_new_with_texture (CoglTexture *texture)
   return _cogl_offscreen_new_with_texture_full (texture, 0, 0);
 }
 
+CoglTexture *
+cogl_offscreen_get_texture (CoglOffscreen *offscreen)
+{
+  return offscreen->texture;
+}
+
 static void
 _cogl_offscreen_free (CoglOffscreen *offscreen)
 {
diff --git a/cogl/cogl/cogl-offscreen.h b/cogl/cogl/cogl-offscreen.h
index 9c84442..26016f5 100644
--- a/cogl/cogl/cogl-offscreen.h
+++ b/cogl/cogl/cogl-offscreen.h
@@ -167,6 +167,12 @@ COGL_DEPRECATED_FOR (cogl_object_unref)
 void
 cogl_offscreen_unref (void *offscreen);
 
+/**
+ * cogl_offscreen_get_texture: (skip)
+ */
+CoglTexture *
+cogl_offscreen_get_texture (CoglOffscreen *offscreen);
+
 COGL_END_DECLS
 
 #endif /* __COGL_OFFSCREEN_H__ */