[mutter] shaped-texture: Make Cullable

[Jasper St. Pierre <jstpierre src gnome org>]

commit ae05059cef4215c0c6def1fccbb3b69dbee697c8
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Jan 16 10:59:34 2014 -0500

    shaped-texture: Make Cullable
    
    Make MetaWindowActor chain up to the generic default MetaCullable
    implementation, and remove the helper methods for MetaSurfaceActor
    and MetaShapedTexture.

 src/compositor/meta-shaped-texture.c |  101 +++++++++++++++++++---------------
 src/compositor/meta-window-actor.c   |   89 ++++--------------------------
 src/meta/meta-shaped-texture.h       |    3 -
 3 files changed, 69 insertions(+), 124 deletions(-)
---
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index fb2ad3a..26ba280 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -35,6 +35,7 @@
 #include <cogl/cogl.h>
 #include <cogl/cogl-texture-pixmap-x11.h>
 #include <gdk/gdk.h> /* for gdk_rectangle_intersect() */
+#include "meta-cullable.h"
 
 static void meta_shaped_texture_dispose  (GObject    *object);
 
@@ -54,8 +55,10 @@ static void meta_shaped_texture_get_preferred_height (ClutterActor *self,
 
 static gboolean meta_shaped_texture_get_paint_volume (ClutterActor *self, ClutterPaintVolume *volume);
 
-G_DEFINE_TYPE (MetaShapedTexture, meta_shaped_texture,
-               CLUTTER_TYPE_ACTOR);
+static void cullable_iface_init (MetaCullableInterface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (MetaShapedTexture, meta_shaped_texture, CLUTTER_TYPE_ACTOR,
+                         G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
 
 #define META_SHAPED_TEXTURE_GET_PRIVATE(obj) \
   (G_TYPE_INSTANCE_GET_PRIVATE ((obj), META_TYPE_SHAPED_TEXTURE, \
@@ -108,6 +111,17 @@ meta_shaped_texture_init (MetaShapedTexture *self)
 }
 
 static void
+set_clip_region (MetaShapedTexture *self,
+                 cairo_region_t    *clip_region)
+{
+  MetaShapedTexturePrivate *priv = self->priv;
+
+  g_clear_pointer (&priv->clip_region, (GDestroyNotify) cairo_region_destroy);
+  if (clip_region)
+    priv->clip_region = cairo_region_copy (clip_region);
+}
+
+static void
 meta_shaped_texture_dispose (GObject *object)
 {
   MetaShapedTexture *self = (MetaShapedTexture *) object;
@@ -121,7 +135,7 @@ meta_shaped_texture_dispose (GObject *object)
   g_clear_pointer (&priv->opaque_region, cairo_region_destroy);
 
   meta_shaped_texture_set_mask_texture (self, NULL);
-  meta_shaped_texture_set_clip_region (self, NULL);
+  set_clip_region (self, NULL);
 
   G_OBJECT_CLASS (meta_shaped_texture_parent_class)->dispose (object);
 }
@@ -489,14 +503,6 @@ meta_shaped_texture_get_paint_volume (ClutterActor *self,
   return clutter_paint_volume_set_from_allocation (volume, self);
 }
 
-ClutterActor *
-meta_shaped_texture_new (void)
-{
-  ClutterActor *self = g_object_new (META_TYPE_SHAPED_TEXTURE, NULL);
-
-  return self;
-}
-
 void
 meta_shaped_texture_set_create_mipmaps (MetaShapedTexture *stex,
                                        gboolean           create_mipmaps)
@@ -734,39 +740,6 @@ meta_shaped_texture_set_input_shape_region (MetaShapedTexture *stex,
 }
 
 /**
- * meta_shaped_texture_set_clip_region:
- * @stex: a #MetaShapedTexture
- * @clip_region: the region of the texture that is visible and
- *   should be painted.
- *
- * Provides a hint to the texture about what areas of the texture
- * are not completely obscured and thus need to be painted. This
- * is an optimization and is not supposed to have any effect on
- * the output.
- *
- * Typically a parent container will set the clip region before
- * painting its children, and then unset it afterwards.
- */
-void
-meta_shaped_texture_set_clip_region (MetaShapedTexture *stex,
-                                    cairo_region_t    *clip_region)
-{
-  MetaShapedTexturePrivate *priv;
-
-  g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
-
-  priv = stex->priv;
-
-  if (priv->clip_region)
-    cairo_region_destroy (priv->clip_region);
-
-  if (clip_region)
-    priv->clip_region = cairo_region_copy (clip_region);
-  else
-    priv->clip_region = NULL;
-}
-
-/**
  * meta_shaped_texture_set_opaque_region:
  * @stex: a #MetaShapedTexture
  * @opaque_region: (transfer full): the region of the texture that
@@ -893,3 +866,43 @@ meta_shaped_texture_get_image (MetaShapedTexture     *stex,
 
   return surface;
 }
+
+static void
+meta_shaped_texture_cull_out (MetaCullable   *cullable,
+                              cairo_region_t *unobscured_region,
+                              cairo_region_t *clip_region)
+{
+  MetaShapedTexture *self = META_SHAPED_TEXTURE (cullable);
+  MetaShapedTexturePrivate *priv = self->priv;
+
+  set_clip_region (self, clip_region);
+
+  if (clutter_actor_get_paint_opacity (CLUTTER_ACTOR (self)) == 0xff)
+    {
+      if (priv->opaque_region)
+        {
+          cairo_region_subtract (unobscured_region, priv->opaque_region);
+          cairo_region_subtract (clip_region, priv->opaque_region);
+        }
+    }
+}
+
+static void
+meta_shaped_texture_reset_culling (MetaCullable *cullable)
+{
+  MetaShapedTexture *self = META_SHAPED_TEXTURE (cullable);
+  set_clip_region (self, NULL);
+}
+
+static void
+cullable_iface_init (MetaCullableInterface *iface)
+{
+  iface->cull_out = meta_shaped_texture_cull_out;
+  iface->reset_culling = meta_shaped_texture_reset_culling;
+}
+
+ClutterActor *
+meta_shaped_texture_new (void)
+{
+  return g_object_new (META_TYPE_SHAPED_TEXTURE, NULL);
+}
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index b9473d2..28d644c 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -70,11 +70,6 @@ struct _MetaWindowActorPrivate
 
   /* A region that matches the shape of the window, including frame bounds */
   cairo_region_t   *shape_region;
-  /* If the window has an input shape, a region that matches the shape */
-  cairo_region_t   *input_region;
-  /* The opaque region, from _NET_WM_OPAQUE_REGION, intersected with
-   * the shape region. */
-  cairo_region_t   *opaque_region;
   /* The region we should clip to when painting the shadow */
   cairo_region_t   *shadow_clip;
 
@@ -366,8 +361,8 @@ meta_window_actor_constructed (GObject *object)
 
   meta_window_actor_update_opacity (self);
 
-  /* Start off with an empty region to maintain the invariant that
-     the shape region is always set */
+  /* Start off with an empty shape region to maintain the invariant
+   * that it's always set */
   priv->shape_region = cairo_region_create ();
 }
 
@@ -401,8 +396,6 @@ meta_window_actor_dispose (GObject *object)
 
   g_clear_pointer (&priv->unobscured_region, cairo_region_destroy);
   g_clear_pointer (&priv->shape_region, cairo_region_destroy);
-  g_clear_pointer (&priv->input_region, cairo_region_destroy);
-  g_clear_pointer (&priv->opaque_region, cairo_region_destroy);
   g_clear_pointer (&priv->shadow_clip, cairo_region_destroy);
 
   g_clear_pointer (&priv->shadow_class, g_free);
@@ -1642,28 +1635,6 @@ meta_window_actor_unmapped (MetaWindowActor *self)
   priv->needs_pixmap = FALSE;
 }
 
-/**
- * meta_window_actor_get_obscured_region:
- * @self: a #MetaWindowActor
- *
- * Gets the region that is completely obscured by the window. Coordinates
- * are relative to the upper-left of the window.
- *
- * Return value: (transfer none): the area obscured by the window,
- *  %NULL is the same as an empty region.
- */
-static cairo_region_t *
-meta_window_actor_get_obscured_region (MetaWindowActor *self)
-{
-  MetaWindowActorPrivate *priv = self->priv;
-  MetaWindow *window = priv->window;
-
-  if (priv->back_pixmap && window->opacity != 0xFF && !priv->window->shaded)
-    return priv->opaque_region;
-  else
-    return NULL;
-}
-
 #if 0
 /* Print out a region; useful for debugging */
 static void
@@ -1713,8 +1684,6 @@ see_region (cairo_region_t *region,
  *
  * Provides a hint as to what areas of the window need to queue
  * redraws when damaged. Regions not in @unobscured_region are completely obscured.
- * Unlike meta_window_actor_set_clip_region(), the region here
- * doesn't take into account any clipping that is in effect while drawing.
  */
 void
 meta_window_actor_set_unobscured_region (MetaWindowActor *self,
@@ -1732,27 +1701,6 @@ meta_window_actor_set_unobscured_region (MetaWindowActor *self,
 }
 
 /**
- * meta_window_actor_set_clip_region:
- * @self: a #MetaWindowActor
- * @clip_region: the region of the screen that isn't completely
- *  obscured.
- *
- * Provides a hint as to what areas of the window need to be
- * drawn. Regions not in @clip_region are completely obscured or
- * not drawn in this frame.
- * This will be set before painting then unset afterwards.
- */
-static void
-meta_window_actor_set_clip_region (MetaWindowActor *self,
-                                   cairo_region_t  *clip_region)
-{
-  MetaWindowActorPrivate *priv = self->priv;
-
-  meta_shaped_texture_set_clip_region (META_SHAPED_TEXTURE (priv->actor),
-                                       clip_region);
-}
-
-/**
  * meta_window_actor_set_clip_region_beneath:
  * @self: a #MetaWindowActor
  * @clip_region: the region of the screen that isn't completely
@@ -1797,18 +1745,7 @@ meta_window_actor_cull_out (MetaCullable   *cullable,
     return;
 
   meta_window_actor_set_unobscured_region (self, unobscured_region);
-  meta_window_actor_set_clip_region (self, clip_region);
-
-  if (clutter_actor_get_paint_opacity (CLUTTER_ACTOR (self)) == 0xff)
-    {
-      cairo_region_t *obscured_region = meta_window_actor_get_obscured_region (self);
-      if (obscured_region)
-        {
-          cairo_region_subtract (unobscured_region, obscured_region);
-          cairo_region_subtract (clip_region, obscured_region);
-        }
-    }
-
+  meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
   meta_window_actor_set_clip_region_beneath (self, clip_region);
 }
 
@@ -1818,9 +1755,8 @@ meta_window_actor_reset_culling (MetaCullable *cullable)
   MetaWindowActor *self = META_WINDOW_ACTOR (cullable);
   MetaWindowActorPrivate *priv = self->priv;
 
-  meta_shaped_texture_set_clip_region (META_SHAPED_TEXTURE (priv->actor),
-                                       NULL);
   g_clear_pointer (&priv->shadow_clip, cairo_region_destroy);
+  meta_cullable_reset_culling_children (cullable);
 }
 
 static void
@@ -2274,8 +2210,7 @@ static void
 meta_window_actor_update_opaque_region (MetaWindowActor *self)
 {
   MetaWindowActorPrivate *priv = self->priv;
-
-  g_clear_pointer (&priv->opaque_region, cairo_region_destroy);
+  cairo_region_t *opaque_region;
 
   if (priv->argb32 && priv->window->opaque_region != NULL)
     {
@@ -2293,17 +2228,17 @@ meta_window_actor_update_opaque_region (MetaWindowActor *self)
        * to be undefined, and considered a client bug. In mutter's
        * case, graphical glitches will occur.
        */
-      priv->opaque_region = cairo_region_copy (priv->window->opaque_region);
-      cairo_region_translate (priv->opaque_region, borders.total.left, borders.total.top);
-      cairo_region_intersect (priv->opaque_region, priv->shape_region);
+      opaque_region = cairo_region_copy (priv->window->opaque_region);
+      cairo_region_translate (opaque_region, borders.total.left, borders.total.top);
+      cairo_region_intersect (opaque_region, priv->shape_region);
     }
   else if (priv->argb32)
-    priv->opaque_region = NULL;
+    opaque_region = NULL;
   else
-    priv->opaque_region = cairo_region_reference (priv->shape_region);
+    opaque_region = cairo_region_reference (priv->shape_region);
 
-  meta_shaped_texture_set_opaque_region (META_SHAPED_TEXTURE (priv->actor),
-                                         priv->opaque_region);
+  meta_shaped_texture_set_opaque_region (META_SHAPED_TEXTURE (priv->actor), opaque_region);
+  cairo_region_destroy (opaque_region);
 }
 
 static void
diff --git a/src/meta/meta-shaped-texture.h b/src/meta/meta-shaped-texture.h
index 935ec5a..bec6bd6 100644
--- a/src/meta/meta-shaped-texture.h
+++ b/src/meta/meta-shaped-texture.h
@@ -84,9 +84,6 @@ void meta_shaped_texture_set_mask_texture (MetaShapedTexture *stex,
 void meta_shaped_texture_set_input_shape_region (MetaShapedTexture *stex,
                                                  cairo_region_t    *shape_region);
 
-void meta_shaped_texture_set_clip_region (MetaShapedTexture *stex,
-                                         cairo_region_t    *clip_region);
-
 void meta_shaped_texture_set_opaque_region (MetaShapedTexture *stex,
                                             cairo_region_t    *opaque_region);