[mutter] ClutterStageWindow: Remove dirty_back_buffer vfunc

[Jonas Ådahl <jadahl src gnome org>]

commit df0805fb0a0fccae1c58e596a0f59c6ac7b9954a
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue May 24 11:53:14 2016 +0800

    ClutterStageWindow: Remove dirty_back_buffer vfunc
    
    It was dead code, so lets remove it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768976

 clutter/clutter/clutter-stage-window.c    |   12 ------------
 clutter/clutter/clutter-stage-window.h    |    4 ----
 clutter/clutter/cogl/clutter-stage-cogl.c |   14 +-------------
 clutter/clutter/cogl/clutter-stage-cogl.h |    2 --
 4 files changed, 1 insertions(+), 31 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage-window.c b/clutter/clutter/clutter-stage-window.c
index 197bf6c..4ef082a 100644
--- a/clutter/clutter/clutter-stage-window.c
+++ b/clutter/clutter/clutter-stage-window.c
@@ -288,18 +288,6 @@ _clutter_stage_window_get_dirty_pixel (ClutterStageWindow *window,
     iface->get_dirty_pixel (window, x, y);
 }
 
-void
-_clutter_stage_window_dirty_back_buffer (ClutterStageWindow *window)
-{
-  ClutterStageWindowIface *iface;
-
-  g_return_if_fail (CLUTTER_IS_STAGE_WINDOW (window));
-
-  iface = CLUTTER_STAGE_WINDOW_GET_IFACE (window);
-  if (iface->dirty_back_buffer)
-    iface->dirty_back_buffer (window);
-}
-
 /* NB: The presumption shouldn't be that a stage can't be comprised of
  * multiple internal framebuffers, so instead of simply naming this
  * function _clutter_stage_window_get_framebuffer(), the "active"
diff --git a/clutter/clutter/clutter-stage-window.h b/clutter/clutter/clutter-stage-window.h
index b12c4f3..25a68d6 100644
--- a/clutter/clutter/clutter-stage-window.h
+++ b/clutter/clutter/clutter-stage-window.h
@@ -76,8 +76,6 @@ struct _ClutterStageWindowIface
 
   void              (* redraw)                  (ClutterStageWindow *stage_window);
 
-  void              (* dirty_back_buffer)       (ClutterStageWindow *stage_window);
-
   void              (* get_dirty_pixel)         (ClutterStageWindow *stage_window,
                                                  int *x, int *y);
 
@@ -133,8 +131,6 @@ void              _clutter_stage_window_set_accept_focus        (ClutterStageWin
 
 void              _clutter_stage_window_redraw                  (ClutterStageWindow *window);
 
-void              _clutter_stage_window_dirty_back_buffer       (ClutterStageWindow *window);
-
 void              _clutter_stage_window_get_dirty_pixel         (ClutterStageWindow *window,
                                                                  int *x, int *y);
 
diff --git a/clutter/clutter/cogl/clutter-stage-cogl.c b/clutter/clutter/cogl/clutter-stage-cogl.c
index 37ce127..ee9d6e9 100644
--- a/clutter/clutter/cogl/clutter-stage-cogl.c
+++ b/clutter/clutter/cogl/clutter-stage-cogl.c
@@ -403,7 +403,7 @@ clutter_stage_cogl_get_redraw_clip_bounds (ClutterStageWindow    *stage_window,
 static inline gboolean
 valid_buffer_age (ClutterStageCogl *stage_cogl, int age)
 {
-  if (age <= 0 || stage_cogl->dirty_backbuffer)
+  if (age <= 0)
     return FALSE;
 
   return age < MIN (stage_cogl->damage_index, DAMAGE_HISTORY_MAX);
@@ -643,9 +643,6 @@ clutter_stage_cogl_redraw (ClutterStageWindow *stage_window)
   /* reset the redraw clipping for the next paint... */
   stage_cogl->initialized_redraw_clip = FALSE;
 
-  /* We have repaired the backbuffer */
-  stage_cogl->dirty_backbuffer = FALSE;
-
   stage_cogl->frame_count++;
 }
 
@@ -658,14 +655,6 @@ clutter_stage_cogl_get_active_framebuffer (ClutterStageWindow *stage_window)
 }
 
 static void
-clutter_stage_cogl_dirty_back_buffer (ClutterStageWindow *stage_window)
-{
- ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_window);
-
- stage_cogl->dirty_backbuffer = TRUE;
-}
-
-static void
 clutter_stage_cogl_get_dirty_pixel (ClutterStageWindow *stage_window,
                                     int                *x,
                                     int                *y)
@@ -707,7 +696,6 @@ clutter_stage_window_iface_init (ClutterStageWindowIface *iface)
   iface->get_redraw_clip_bounds = clutter_stage_cogl_get_redraw_clip_bounds;
   iface->redraw = clutter_stage_cogl_redraw;
   iface->get_active_framebuffer = clutter_stage_cogl_get_active_framebuffer;
-  iface->dirty_back_buffer = clutter_stage_cogl_dirty_back_buffer;
   iface->get_dirty_pixel = clutter_stage_cogl_get_dirty_pixel;
 }
 
diff --git a/clutter/clutter/cogl/clutter-stage-cogl.h b/clutter/clutter/cogl/clutter-stage-cogl.h
index 16c9de8..c8abdef 100644
--- a/clutter/clutter/cogl/clutter-stage-cogl.h
+++ b/clutter/clutter/cogl/clutter-stage-cogl.h
@@ -63,8 +63,6 @@ struct _ClutterStageCogl
   /* TRUE if the current paint cycle has a clipped redraw. In that
      case bounding_redraw_clip specifies the the bounds. */
   guint using_clipped_redraw : 1;
-
-  guint dirty_backbuffer     : 1;
 };
 
 struct _ClutterStageCoglClass