Add _gdk_drawable_get_subwindow_scratch_gc as a way to get cached gcs with GDK_INCLU...

diff --git a/gdk/gdkdraw.c b/gdk/gdkdraw.c
index 73f262ad3cf1b25b4b637f28b4e7e9d98516b1db..9c9385fbfbcc125036e724872c19195c5aaca842 100644 (file)
--- a/gdk/gdkdraw.c
+++ b/gdk/gdkdraw.c
@@ -1784,6 +1784,52 @@ _gdk_drawable_get_scratch_gc (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

diff --git a/gdk/gdkinternals.h b/gdk/gdkinternals.h
index 62d9f132fe362efeff4c453b77f4ca46ed9c22ce..3841885a85aea60bf6beb3a52186431bdc260a66 100644 (file)
--- a/gdk/gdkinternals.h
+++ b/gdk/gdkinternals.h
@@ -241,6 +241,7 @@ cairo_surface_t * _gdk_drawable_create_cairo_surface (GdkDrawable *drawable,
 /* GC caching */
 GdkGC *_gdk_drawable_get_scratch_gc (GdkDrawable *drawable,
                                     gboolean     graphics_exposures);
+GdkGC *_gdk_drawable_get_subwindow_scratch_gc (GdkDrawable *drawable);
 
 void _gdk_gc_update_context (GdkGC          *gc,
                             cairo_t        *cr,

diff --git a/gdk/gdkscreen.h b/gdk/gdkscreen.h
index b1f3b8e8a7fb908c53b060333284d149acf1f09c..96ff8d44a2f112ac7194f2fc28111ddaeae2681e 100644 (file)
--- a/gdk/gdkscreen.h
+++ b/gdk/gdkscreen.h
@@ -51,6 +51,7 @@ struct _GdkScreen
 
   GdkGC *normal_gcs[32];
   GdkGC *exposure_gcs[32];
+  GdkGC *subwindow_gcs[32];
 
   cairo_font_options_t *font_options;
   double resolution;           /* pixels/points scale factor for fonts */