gdk: Move scratch GC handling to X11

... and implement it directly instead of using GdkGC, as GdkGC is about
to be deleted, but we need this code.

gdk/gdkdraw.c

@@ -269,52 +269,6 @@ _gdk_drawable_ref_cairo_surface (GdkDrawable *drawable)
 
 /************************************************************************/
 
-/**
- * _gdk_drawable_get_subwindow_scratch_gc:
- * @drawable: A #GdkDrawable
- * 
- * Returns a #GdkGC suitable for drawing on @drawable. The #GdkGC has
- * the standard values for @drawable, except for the graphics_exposures
- * field which is %TRUE and the subwindow mode which is %GDK_INCLUDE_INFERIORS.
- *
- * The foreground color of the returned #GdkGC is undefined. The #GdkGC
- * must not be altered in any way, except to change its foreground color.
- * 
- * Return value: A #GdkGC suitable for drawing on @drawable
- * 
- * Since: 2.18
- **/
-GdkGC *
-_gdk_drawable_get_subwindow_scratch_gc (GdkDrawable *drawable)
-{
-  GdkScreen *screen;
-  gint depth;
-
-  g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
-
-  screen = gdk_drawable_get_screen (drawable);
-
-  g_return_val_if_fail (!screen->closed, NULL);
-
-  depth = gdk_drawable_get_depth (drawable) - 1;
-
-  if (!screen->subwindow_gcs[depth])
-    {
-      GdkGCValues values;
-      GdkGCValuesMask mask;
-      
-      values.graphics_exposures = TRUE;
-      values.subwindow_mode = GDK_INCLUDE_INFERIORS;
-      mask = GDK_GC_EXPOSURES | GDK_GC_SUBWINDOW;  
-      
-      screen->subwindow_gcs[depth] =
-	gdk_gc_new_with_values (drawable, &values, mask);
-    }
-  
-  return screen->subwindow_gcs[depth];
-}
-
-
 /*
  * _gdk_drawable_get_source_drawable:
  * @drawable: a #GdkDrawable

gdk/gdkinternals.h

@@ -324,9 +324,6 @@ cairo_surface_t * _gdk_drawable_create_cairo_surface (GdkDrawable *drawable,
 						      int width,
 						      int height);
 
-/* GC caching */
-GdkGC *_gdk_drawable_get_subwindow_scratch_gc (GdkDrawable *drawable);
-
 /*************************************
  * Interfaces used by windowing code *
  *************************************/

gdk/gdkscreen.c

@@ -29,7 +29,6 @@
 #include "gdkintl.h"
 
 
-static void gdk_screen_dispose      (GObject        *object);
 static void gdk_screen_finalize     (GObject        *object);
 static void gdk_screen_set_property (GObject        *object,
 				     guint           prop_id,
@@ -64,7 +63,6 @@ gdk_screen_class_init (GdkScreenClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
-  object_class->dispose = gdk_screen_dispose;
   object_class->finalize = gdk_screen_finalize;
   object_class->set_property = gdk_screen_set_property;
   object_class->get_property = gdk_screen_get_property;
@@ -155,24 +153,6 @@ gdk_screen_init (GdkScreen *screen)
   screen->resolution = -1.;
 }
 
-static void
-gdk_screen_dispose (GObject *object)
-{
-  GdkScreen *screen = GDK_SCREEN (object);
-  gint i;
-
-  for (i = 0; i < 32; ++i)
-    {
-      if (screen->subwindow_gcs[i])
-        {
-          g_object_unref (screen->subwindow_gcs[i]);
-          screen->subwindow_gcs[i] = NULL;
-        }
-    }
-
-  G_OBJECT_CLASS (gdk_screen_parent_class)->dispose (object);
-}
-
 static void
 gdk_screen_finalize (GObject *object)
 {

gdk/gdkscreen.h

@@ -49,8 +49,6 @@ struct _GdkScreen
 
   guint GSEAL (closed) : 1;
 
-  GdkGC *GSEAL (subwindow_gcs[32]);
-
   cairo_font_options_t *GSEAL (font_options);
   double GSEAL (resolution);	/* pixels/points scale factor for fonts */
 };

gdk/x11/gdkgeometry-x11.c

@@ -225,6 +225,47 @@ gdk_window_queue (GdkWindow          *window,
   g_queue_push_tail (display_x11->translate_queue, item);
 }
 
+static GC
+_get_scratch_gc (GdkWindowObject *window, cairo_region_t *clip_region)
+{
+  GdkScreenX11 *screen;
+  XRectangle *rectangles;
+  gint n_rects;
+  gint depth;
+
+  screen = GDK_SCREEN_X11 (gdk_drawable_get_screen (GDK_DRAWABLE (window)));
+  depth = gdk_drawable_get_depth (GDK_DRAWABLE (window)) - 1;
+
+  if (!screen->subwindow_gcs[depth])
+    {
+      XGCValues values;
+      
+      values.graphics_exposures = True;
+      values.subwindow_mode = IncludeInferiors;
+      
+      screen->subwindow_gcs[depth] = XCreateGC (screen->xdisplay,
+                                                GDK_WINDOW_XID (window),
+                                                GCSubwindowMode | GCGraphicsExposures,
+                                                &values);
+    }
+  
+  _gdk_region_get_xrectangles (clip_region,
+                               0, 0,
+                               &rectangles,
+                               &n_rects);
+  
+  XSetClipRectangles (screen->xdisplay,
+                      screen->subwindow_gcs[depth],
+                      0, 0,
+                      rectangles, n_rects,
+                      YXBanded);
+  
+  g_free (rectangles);
+  return screen->subwindow_gcs[depth];
+}
+
+
+
 void
 _gdk_x11_window_translate (GdkWindow      *window,
                            cairo_region_t *area,
@@ -232,7 +273,7 @@ _gdk_x11_window_translate (GdkWindow      *window,
                            gint            dy)
 {
   GdkWindowQueueItem *item;
-  GdkGC *tmp_gc;
+  GC xgc;
   GdkRectangle extents;
   GdkWindowObject *private, *impl;
   int px, py;
@@ -255,17 +296,10 @@ _gdk_x11_window_translate (GdkWindow      *window,
 
   cairo_region_get_extents (area, &extents);
 
-  tmp_gc = _gdk_drawable_get_subwindow_scratch_gc ((GdkWindow *)private);
-  gdk_gc_set_clip_region (tmp_gc, area);
+  xgc = _get_scratch_gc (impl, area);
 
   cairo_region_translate (area, -dx, -dy); /* Move to source region */
 
-  /* Ensure that the gc is flushed so that we get the right
-     serial from NextRequest in gdk_window_queue, i.e. the
-     the serial for the XCopyArea, not the ones from flushing
-     the gc. */
-  _gdk_x11_gc_flush (tmp_gc);
-
   item = g_new (GdkWindowQueueItem, 1);
   item->type = GDK_WINDOW_QUEUE_TRANSLATE;
   item->u.translate.area = cairo_region_copy (area);
@@ -276,12 +310,10 @@ _gdk_x11_window_translate (GdkWindow      *window,
   XCopyArea (GDK_WINDOW_XDISPLAY (impl),
              GDK_DRAWABLE_IMPL_X11 (private->impl)->xid,
              GDK_DRAWABLE_IMPL_X11 (impl->impl)->xid,
-             GDK_GC_GET_XGC (tmp_gc),
+             xgc,
              extents.x - dx, extents.y - dy,
              extents.width, extents.height,
              extents.x, extents.y);
-
-  gdk_gc_set_clip_region (tmp_gc, NULL);
 }
 
 gboolean

gdk/x11/gdkscreen-x11.c

@@ -297,6 +297,16 @@ static void
 gdk_screen_x11_dispose (GObject *object)
 {
   GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (object);
+  int i;
+
+  for (i = 0; i < 32; ++i)
+    {
+      if (screen_x11->subwindow_gcs[i])
+        {
+          XFreeGC (screen_x11->xdisplay, screen_x11->subwindow_gcs[i]);
+          screen_x11->subwindow_gcs[i] = 0;
+        }
+    }
 
   _gdk_screen_x11_events_uninit (GDK_SCREEN (object));
 

gdk/x11/gdkscreen-x11.h

@@ -95,6 +95,9 @@ struct _GdkScreenX11
   GdkX11Monitor	*monitors;
   gint           primary_monitor;
 
+  /* cache for window->translate vfunc */
+  GC subwindow_gcs[32];
+
   /* Xft resources for the display, used for default values for
    * the Xft/ XSETTINGS
    */