[mutter/gnome-3-36] clutter/paint-context: Add 'no-cursors' paint flag

[Jonas Ådahl <jadahl src gnome org>]

commit 797c34924590e693da57ff50e9f2a4ced444557c
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Apr 20 22:41:12 2020 +0200

    clutter/paint-context: Add 'no-cursors' paint flag
    
    Will be used by the stage to not paint the overlays. We skip all
    overlays since overlays are only ever used for pointer cursors when the
    hardware cursors cannot or should not be used.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1222

 clutter/clutter/clutter-paint-context-private.h | 1 +
 clutter/clutter/clutter-paint-context.c         | 2 +-
 src/backends/meta-stage.c                       | 8 ++++++--
 3 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/clutter/clutter/clutter-paint-context-private.h b/clutter/clutter/clutter-paint-context-private.h
index 32c54c0ab..4cc72043e 100644
--- a/clutter/clutter/clutter-paint-context-private.h
+++ b/clutter/clutter/clutter-paint-context-private.h
@@ -23,6 +23,7 @@
 typedef enum _ClutterPaintFlag
 {
   CLUTTER_PAINT_FLAG_NONE = 0,
+  CLUTTER_PAINT_FLAG_NO_CURSORS = 1 << 0,
 } ClutterPaintFlag;
 
 ClutterPaintContext * clutter_paint_context_new_for_view (ClutterStageView     *view,
diff --git a/clutter/clutter/clutter-paint-context.c b/clutter/clutter/clutter-paint-context.c
index d331f97bb..fc519c058 100644
--- a/clutter/clutter/clutter-paint-context.c
+++ b/clutter/clutter/clutter-paint-context.c
@@ -66,7 +66,7 @@ clutter_paint_context_new_for_framebuffer (CoglFramebuffer *framebuffer)
 
   paint_context = g_new0 (ClutterPaintContext, 1);
   g_ref_count_init (&paint_context->ref_count);
-  paint_context->paint_flags = CLUTTER_PAINT_FLAG_NONE;
+  paint_context->paint_flags = CLUTTER_PAINT_FLAG_NO_CURSORS;
 
   clutter_paint_context_push_framebuffer (paint_context, framebuffer);
 
diff --git a/src/backends/meta-stage.c b/src/backends/meta-stage.c
index e3efe1cd8..43b0ecb2a 100644
--- a/src/backends/meta-stage.c
+++ b/src/backends/meta-stage.c
@@ -206,8 +206,12 @@ meta_stage_paint (ClutterActor        *actor,
 
   g_signal_emit (stage, signals[ACTORS_PAINTED], 0);
 
-  for (l = stage->overlays; l; l = l->next)
-    meta_overlay_paint (l->data, paint_context);
+  if (!(clutter_paint_context_get_paint_flags (paint_context) &
+        CLUTTER_PAINT_FLAG_NO_CURSORS))
+    {
+      for (l = stage->overlays; l; l = l->next)
+        meta_overlay_paint (l->data, paint_context);
+    }
 
   if (view)
     {