ui: always set the frame background to None

This way the xserver never paints the frame background, even if
the client window is destroyed. This allows us to have clean
destroy window animation.

There is no problem with interactive resizing because applications
are using the XSync protocol, so we're not painting unless the
client has redrawn.

https://bugzilla.gnome.org/show_bug.cgi?id=734054

origin commit:
https://gitlab.gnome.org/GNOME/metacity/commit/78c283c

1 files changed, 0 insertions, 112 deletions

diff --git a/src/ui/frames.c b/src/ui/frames.c
index 816ebd8c..f06c22be 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -79,9 +79,6 @@ static void meta_frames_paint_to_drawable (MetaFrames   *frames,
                                            MetaUIFrame  *frame,
                                            cairo_t      *cr);
 
-static void meta_frames_set_window_background (MetaFrames   *frames,
-                                               MetaUIFrame  *frame);
-
 static void meta_frames_calc_geometry (MetaFrames        *frames,
                                        MetaUIFrame         *frame,
                                        MetaFrameGeometry *fgeom);
@@ -343,12 +340,6 @@ queue_recalc_func (gpointer key, gpointer value, gpointer data)
   frames = META_FRAMES (data);
   frame = value;
 
-  /* If a resize occurs it will cause a redraw, but the
-   * resize may not actually be needed so we always redraw
-   * in case of color change.
-   */
-  meta_frames_set_window_background (frames, frame);
-
   invalidate_whole_window (frames, frame);
   meta_core_queue_frame_resize (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                                 frame->xwindow);
@@ -388,12 +379,6 @@ queue_draw_func (gpointer key, gpointer value, gpointer data)
   frames = META_FRAMES (data);
   frame = value;
 
-  /* If a resize occurs it will cause a redraw, but the
-   * resize may not actually be needed so we always redraw
-   * in case of color change.
-   */
-  meta_frames_set_window_background (frames, frame);
-
   invalidate_whole_window (frames, frame);
 }
 
@@ -609,11 +594,6 @@ meta_frames_manage_window (MetaFrames *frames,
   frame->shape_applied = FALSE;
   frame->prelit_control = META_FRAME_CONTROL_NONE;
 
-  /* Don't set the window background yet; we need frame->xwindow to be
-   * registered with its MetaWindow, which happens after this function
-   * and meta_ui_create_frame_window() return to meta_window_ensure_frame().
-   */
-
   meta_core_grab_buttons (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), frame->xwindow);
 
   g_hash_table_replace (frames->frames, &frame->xwindow, frame);
@@ -734,52 +714,6 @@ meta_frames_get_geometry (MetaFrames *frames,
   *right_width *= scale;
 }
 
-void
-meta_frames_reset_bg (MetaFrames *frames,
-                      Window  xwindow)
-{
-  MetaUIFrame *frame;
-
-  frame = meta_frames_lookup_window (frames, xwindow);
-
-  meta_frames_set_window_background (frames, frame);
-}
-
-static void
-set_background_none (Display *xdisplay,
-                     Window   xwindow)
-{
-  XSetWindowAttributes attrs;
-
-  attrs.background_pixmap = None;
-  XChangeWindowAttributes (xdisplay, xwindow,
-                           CWBackPixmap, &attrs);
-}
-
-void
-meta_frames_unflicker_bg (MetaFrames *frames,
-                          Window      xwindow,
-                          int         target_width,
-                          int         target_height)
-{
-  MetaUIFrame *frame;
-
-  frame = meta_frames_lookup_window (frames, xwindow);
-  g_return_if_fail (frame != NULL);
-
-#if 0
-  pixmap = gdk_pixmap_new (frame->window,
-                           width, height,
-                           -1);
-
-  /* Oops, no way to get the background here */
-
-  meta_frames_paint_to_drawable (frames, frame, pixmap);
-#endif
-
-  set_background_none (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), frame->xwindow);
-}
-
 #ifdef HAVE_SHAPE
 static void
 apply_cairo_region_to_window (Display        *display,
@@ -2497,52 +2431,6 @@ meta_frames_paint_to_drawable (MetaFrames   *frames,
                                     mini_icon, icon);
 }
 
-static void
-meta_frames_set_window_background (MetaFrames   *frames,
-                                   MetaUIFrame  *frame)
-{
-  MetaFrameFlags flags;
-  MetaFrameType type;
-  MetaFrameStyle *style;
-  gboolean frame_exists;
-
-  meta_core_get (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), frame->xwindow,
-                 META_CORE_WINDOW_HAS_FRAME, &frame_exists,
-                 META_CORE_GET_FRAME_FLAGS, &flags,
-                 META_CORE_GET_FRAME_TYPE, &type,
-                 META_CORE_GET_END);
-
-  if (frame_exists)
-    {
-      style = meta_theme_get_frame_style (meta_theme_get_current (),
-                                          type, flags);
-    }
-
-  if (frame_exists && style->window_background_color != NULL)
-    {
-      GdkRGBA color;
-      GdkVisual *visual;
-
-      meta_color_spec_render (style->window_background_color,
-                              frame->style,
-                              &color);
-
-      /* Set A in ARGB to window_background_alpha, if we have ARGB */
-
-      visual = gtk_widget_get_visual (GTK_WIDGET (frames));
-      if (gdk_visual_get_depth (visual) == 32) /* we have ARGB */
-        {
-          color.alpha = style->window_background_alpha / 255.0;
-        }
-
-      gdk_window_set_background_rgba (frame->window, &color);
-    }
-  else
-    {
-      gtk_style_context_set_background (frame->style, frame->window);
-    }
- }
-
 static gboolean
 meta_frames_enter_notify_event      (GtkWidget           *widget,
                                      GdkEventCrossing    *event)