surface-actor: Remove get_image() function

It is unused and removing it allows us some further cleanups.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1978>

src/compositor/meta-surface-actor.c

@@ -373,31 +373,6 @@ meta_surface_actor_init (MetaSurfaceActor *self)
                                   CLUTTER_REQUEST_CONTENT_SIZE);
 }
 
-/**
- * meta_surface_actor_get_image:
- * @self: A #MetaSurfaceActor
- * @clip: (nullable): A clipping rectangle. The clip region is in
- * the same coordinate space as the contents preferred size.
- * For a shaped texture of a wl_surface, this means surface
- * coordinate space. If NULL, the whole content will be used.
- *
- * Get the image from the texture content. The resulting size of
- * the returned image may be different from the preferred size of
- * the shaped texture content.
- *
- * Returns: (nullable) (transfer full): a new cairo surface to be freed
- * with cairo_surface_destroy().
- */
-cairo_surface_t *
-meta_surface_actor_get_image (MetaSurfaceActor      *self,
-                              cairo_rectangle_int_t *clip)
-{
-  MetaSurfaceActorPrivate *priv =
-    meta_surface_actor_get_instance_private (self);
-
-  return meta_shaped_texture_get_image (priv->texture, clip);
-}
-
 MetaShapedTexture *
 meta_surface_actor_get_texture (MetaSurfaceActor *self)
 {

src/compositor/meta-surface-actor.h

@@ -27,9 +27,6 @@ struct _MetaSurfaceActorClass
   gboolean (* is_opaque)         (MetaSurfaceActor *actor);
 };
 
-cairo_surface_t *meta_surface_actor_get_image (MetaSurfaceActor      *self,
-                                               cairo_rectangle_int_t *clip);
-
 MetaShapedTexture *meta_surface_actor_get_texture (MetaSurfaceActor *self);
 
 void meta_surface_actor_update_area (MetaSurfaceActor *self,