[mutter] clutter/features: Remove 'offscreen' feature

[Marge Bot <marge-bot src gnome org>]

commit d9f0d937d9764bdfb126da511a769c126f6d644d
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Sep 17 09:49:31 2021 +0200

    clutter/features: Remove 'offscreen' feature
    
    It's also unused. Offscreen framebuffers are still used however, but
    it's assumed to exist.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2002>

 clutter/clutter/clutter-enums.h   | 2 --
 clutter/clutter/clutter-feature.c | 2 --
 2 files changed, 4 deletions(-)
---
diff --git a/clutter/clutter/clutter-enums.h b/clutter/clutter/clutter-enums.h
index 2ae6d50bcc..3bfe3412b9 100644
--- a/clutter/clutter/clutter-enums.h
+++ b/clutter/clutter/clutter-enums.h
@@ -900,7 +900,6 @@ typedef enum /*< prefix=CLUTTER_SCROLL >*/
  * ClutterFeatureFlags:
  * @CLUTTER_FEATURE_STAGE_STATIC: Set if stage size if fixed (i.e framebuffer)
  * @CLUTTER_FEATURE_SHADERS_GLSL: Set if the backend supports GLSL shaders.
- * @CLUTTER_FEATURE_OFFSCREEN: Set if the backend supports offscreen rendering.
  * @CLUTTER_FEATURE_STAGE_MULTIPLE: Set if multiple stages are supported.
  * @CLUTTER_FEATURE_SWAP_EVENTS: Set if the GLX_INTEL_swap_event is supported.
  *
@@ -913,7 +912,6 @@ typedef enum
 {
   CLUTTER_FEATURE_STAGE_STATIC           = (1 << 6),
   CLUTTER_FEATURE_SHADERS_GLSL           = (1 << 9),
-  CLUTTER_FEATURE_OFFSCREEN              = (1 << 10),
   CLUTTER_FEATURE_STAGE_MULTIPLE         = (1 << 11),
   CLUTTER_FEATURE_SWAP_EVENTS            = (1 << 12)
 } ClutterFeatureFlags;
diff --git a/clutter/clutter/clutter-feature.c b/clutter/clutter/clutter-feature.c
index 9cda1d0755..84e2defa10 100644
--- a/clutter/clutter/clutter-feature.c
+++ b/clutter/clutter/clutter-feature.c
@@ -64,8 +64,6 @@ clutter_features_from_cogl (void)
   
   clutter_flags |= CLUTTER_FEATURE_SHADERS_GLSL;
   
-  clutter_flags |= CLUTTER_FEATURE_OFFSCREEN;
-  
   return clutter_flags;
 }