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cullable: Turn cull_out / reset_culling into a separate interface

Browse Source 
Instead of hardcoded knowledge of certain classes in MetaWindowGroup,
create a generic interface that all actors can implement to get parts of
their regions culled out during redraw, without needing any special
knowledge of how to handle a specific actor.

The names now are a bit suspect. MetaBackgroundGroup is a simple
MetaCullable that knows how to cull children, and MetaWindowGroup is the
"toplevel" cullable that computes the initial two regions. A future
cleanup here could be to merge MetaWindowGroup / MetaBackgroundGroup so
that we only have a generic MetaSimpleCullable, and move the "toplevel"
cullability to be a MetaCullableToplevel.

https://bugzilla.gnome.org/show_bug.cgi?id=714706
This commit is contained in:
Jasper St. Pierre 2013-11-21 15:25:08 -05:00
parent d8c66077f0
commit 47144253e4
12 changed files with 379 additions and 213 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
doc/reference/meta-sections.txt
View File

@ -388,6 +388,23 @@ MetaWindowActorPrivate
meta_window_actor_get_type
</SECTION>
<SECTION>
<FILE>meta-cullable</FILE>
<TITLE>MetaCullable</TITLE>
MetaCullable
MetaCullableInterface
meta_cullable_cull_out
meta_cullable_reset_culling
meta_cullable_cull_out_children
meta_cullable_reset_culling_children
<SUBSECTION Standard>
META_TYPE_CULLABLE
META_CULLABLE
META_IS_CULLABLE
META_CULLABLE_GET_IFACE
meta_cullable_get_type
</SECTION>
<SECTION>
<FILE>prefs</FILE>
MetaPreference

3
src/Makefile.am
View File

@ -55,7 +55,8 @@ libmutter_la_SOURCES = \
compositor/meta-background-actor.c \
compositor/meta-background-actor-private.h \
compositor/meta-background-group.c \
compositor/meta-background-group-private.h \
compositor/meta-cullable.c \
compositor/meta-cullable.h \
compositor/meta-module.c \
compositor/meta-module.h \
compositor/meta-plugin.c \

3
src/compositor/meta-background-actor-private.h
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@ -6,9 +6,6 @@
#include <meta/screen.h>
#include <meta/meta-background-actor.h>
void meta_background_actor_set_clip_region (MetaBackgroundActor *self,
cairo_region_t *clip_region);
cairo_region_t *meta_background_actor_get_clip_region (MetaBackgroundActor *self);
#endif /* META_BACKGROUND_ACTOR_PRIVATE_H */

57
src/compositor/meta-background-actor.c
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@ -41,20 +41,35 @@
#include <meta/errors.h>
#include <meta/meta-background.h>
#include "meta-background-actor-private.h"
#include "meta-cullable.h"
struct _MetaBackgroundActorPrivate
{
cairo_region_t *clip_region;
};
G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
static void cullable_iface_init (MetaCullableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
static void
set_clip_region (MetaBackgroundActor *self,
cairo_region_t *clip_region)
{
MetaBackgroundActorPrivate *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_background_actor_dispose (GObject *object)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (object);
meta_background_actor_set_clip_region (self, NULL);
set_clip_region (self, NULL);
G_OBJECT_CLASS (meta_background_actor_parent_class)->dispose (object);
}
@ -166,31 +181,27 @@ meta_background_actor_new (void)
return CLUTTER_ACTOR (self);
}
/**
* meta_background_actor_set_clip_region:
* @self: a #MetaBackgroundActor
* @clip_region: (allow-none): the area of the actor (in allocate-relative
* coordinates) that is visible.
*
* Sets the area of the background that is unobscured by overlapping windows.
* This is used to optimize and only paint the visible portions.
*/
void
meta_background_actor_set_clip_region (MetaBackgroundActor *self,
static void
meta_background_actor_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
MetaBackgroundActorPrivate *priv;
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (cullable);
set_clip_region (self, clip_region);
}
g_return_if_fail (META_IS_BACKGROUND_ACTOR (self));
static void
meta_background_actor_reset_culling (MetaCullable *cullable)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (cullable);
set_clip_region (self, NULL);
}
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
cullable_iface_init (MetaCullableInterface *iface)
{
iface->cull_out = meta_background_actor_cull_out;
iface->reset_culling = meta_background_actor_reset_culling;
}
/**

11
src/compositor/meta-background-group-private.h
View File

@ -1,11 +0,0 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#ifndef META_BACKGROUND_GROUP_PRIVATE_H
#define META_BACKGROUND_GROUP_PRIVATE_H
#include <meta/screen.h>
#include <meta/meta-background-group.h>
void meta_background_group_set_clip_region (MetaBackgroundGroup *self,
cairo_region_t *visible_region);
#endif /* META_BACKGROUND_GROUP_PRIVATE_H */

67
src/compositor/meta-background-group.c
View File

@ -16,58 +16,45 @@
#include <config.h>
#include "compositor-private.h"
#include "clutter-utils.h"
#include "meta-background-actor-private.h"
#include "meta-background-group-private.h"
#include <meta/meta-background-group.h>
#include "meta-cullable.h"
G_DEFINE_TYPE (MetaBackgroundGroup, meta_background_group, CLUTTER_TYPE_ACTOR);
static void cullable_iface_init (MetaCullableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaBackgroundGroup, meta_background_group, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
static void
meta_background_group_class_init (MetaBackgroundGroupClass *klass)
{
}
static void
meta_background_group_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
}
static void
meta_background_group_reset_culling (MetaCullable *cullable)
{
meta_cullable_reset_culling_children (cullable);
}
static void
cullable_iface_init (MetaCullableInterface *iface)
{
iface->cull_out = meta_background_group_cull_out;
iface->reset_culling = meta_background_group_reset_culling;
}
static void
meta_background_group_init (MetaBackgroundGroup *self)
{
}
/**
* meta_background_group_set_clip_region:
* @self: a #MetaBackgroundGroup
* @region: (allow-none): the parts of the background to paint
*
* Sets the area of the backgrounds that is unobscured by overlapping windows.
* This is used to optimize and only paint the visible portions.
*/
void
meta_background_group_set_clip_region (MetaBackgroundGroup *self,
cairo_region_t *region)
{
ClutterActor *child;
for (child = clutter_actor_get_first_child (CLUTTER_ACTOR (self));
child != NULL;
child = clutter_actor_get_next_sibling (child))
{
if (META_IS_BACKGROUND_ACTOR (child))
{
meta_background_actor_set_clip_region (META_BACKGROUND_ACTOR (child), region);
}
else if (META_IS_BACKGROUND_GROUP (child))
{
int x, y;
if (!meta_actor_is_untransformed (child, &x, &y))
continue;
cairo_region_translate (region, -x, -y);
meta_background_group_set_clip_region (META_BACKGROUND_GROUP (child), region);
cairo_region_translate (region, x, y);
}
}
}
ClutterActor *
meta_background_group_new (void)
{

191
src/compositor/meta-cullable.c Normal file
View File

@ -0,0 +1,191 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2013 Red Hat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Written by:
* Owen Taylor <otaylor@redhat.com>
* Ray Strode <rstrode@redhat.com>
* Jasper St. Pierre <jstpierre@mecheye.net>
*/
#include "config.h"
#include "meta-cullable.h"
#include "clutter-utils.h"
G_DEFINE_INTERFACE (MetaCullable, meta_cullable, CLUTTER_TYPE_ACTOR);
/**
* SECTION:meta-cullable
* @title: MetaCullable
* @short_description: CPU culling operations for efficient drawing
*
* When we are painting a stack of 5-10 large actors, the standard
* bottom-to-top method of drawing every actor results in a tremendous
* amount of overdraw. If these actors are painting textures like
* windows, it can easily max out the available memory bandwidth on a
* low-end graphics chipset. It's even worse if window textures are
* being accessed over the AGP bus.
*
* #MetaCullable is our solution. The basic technique applied here is to
* do a pre-pass before painting where we walk each actor from top to bottom
* and ask each actor to "cull itself out". We pass in a region it can copy
* to clip its drawing to, and the actor can subtract its fully opaque pixels
* so that actors underneath know not to draw there as well.
*/
/**
* meta_cullable_cull_out_children:
* @cullable: The #MetaCullable
* @unobscured_region: The unobscured region, as passed into cull_out()
* @clip_region: The clip region, as passed into cull_out()
*
* This is a helper method for actors that want to recurse over their
* child actors, and cull them out.
*
* See #MetaCullable and meta_cullable_cull_out() for more details.
*/
void
meta_cullable_cull_out_children (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
ClutterActor *actor = CLUTTER_ACTOR (cullable);
ClutterActor *child;
ClutterActorIter iter;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_prev (&iter, &child))
{
int x, y;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
/* If an actor has effects applied, then that can change the area
* it paints and the opacity, so we no longer can figure out what
* portion of the actor is obscured and what portion of the screen
* it obscures, so we skip the actor.
*
* This has a secondary beneficial effect: if a ClutterOffscreenEffect
* is applied to an actor, then our clipped redraws interfere with the
* caching of the FBO - even if we only need to draw a small portion
* of the window right now, ClutterOffscreenEffect may use other portions
* of the FBO later. So, skipping actors with effects applied also
* prevents these bugs.
*
* Theoretically, we should check clutter_actor_get_offscreen_redirect()
* as well for the same reason, but omitted for simplicity in the
* hopes that no-one will do that.
*/
if (clutter_actor_has_effects (child))
continue;
if (!META_IS_CULLABLE (child))
continue;
if (!meta_actor_is_untransformed (child, &x, &y))
continue;
/* Temporarily move to the coordinate system of the actor */
cairo_region_translate (unobscured_region, - x, - y);
cairo_region_translate (clip_region, - x, - y);
meta_cullable_cull_out (META_CULLABLE (child), unobscured_region, clip_region);
cairo_region_translate (unobscured_region, x, y);
cairo_region_translate (clip_region, x, y);
}
}
/**
* meta_cullable_reset_culling_children:
* @cullable: The #MetaCullable
*
* This is a helper method for actors that want to recurse over their
* child actors, and cull them out.
*
* See #MetaCullable and meta_cullable_reset_culling() for more details.
*/
void
meta_cullable_reset_culling_children (MetaCullable *cullable)
{
ClutterActor *actor = CLUTTER_ACTOR (cullable);
ClutterActor *child;
ClutterActorIter iter;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
if (!META_IS_CULLABLE (child))
continue;
meta_cullable_reset_culling (META_CULLABLE (child));
}
}
static void
meta_cullable_default_init (MetaCullableInterface *iface)
{
}
/**
* meta_cullable_cull_out:
* @cullable: The #MetaCullable
* @unobscured_region: The unobscured region, in @cullable's space.
* @clip_region: The clip region, in @cullable's space.
*
* When #MetaWindowGroup is painted, we walk over its direct cullable
* children from top to bottom and ask themselves to "cull out". Cullables
* can use @unobscured_region and @clip_region to clip their drawing. Actors
* interested in eliminating overdraw should copy the @clip_region and only
* paint those parts, as everything else has been obscured by actors above it.
*
* Actors that may have fully opaque parts should also subtract out a region
* that is fully opaque from @unobscured_region and @clip_region.
*
* @unobscured_region and @clip_region are extremely similar. The difference
* is that @clip_region starts off with the stage's clip, if Clutter detects
* that we're doing a clipped redraw. @unobscured_region, however, starts off
* with the full stage size, so actors that may want to record what parts of
* their window are unobscured for e.g. scheduling repaints can do so.
*
* Actors that have children can also use the meta_cullable_cull_out_children()
* helper method to do a simple cull across all their children.
*/
void
meta_cullable_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
META_CULLABLE_GET_IFACE (cullable)->cull_out (cullable, unobscured_region, clip_region);
}
/**
* meta_cullable_reset_culling:
* @cullable: The #MetaCullable
*
* Actors that copied data in their cull_out() implementation can now
* reset their data, as the paint is now over. Additional paints may be
* done by #ClutterClone or similar, and they should not be affected by
* the culling operation.
*/
void
meta_cullable_reset_culling (MetaCullable *cullable)
{
META_CULLABLE_GET_IFACE (cullable)->reset_culling (cullable);
}

68
src/compositor/meta-cullable.h Normal file
View File

@ -0,0 +1,68 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2013 Red Hat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Written by:
* Owen Taylor <otaylor@redhat.com>
* Ray Strode <rstrode@redhat.com>
* Jasper St. Pierre <jstpierre@mecheye.net>
*/
#ifndef __META_CULLABLE_H__
#define __META_CULLABLE_H__
#include <clutter/clutter.h>
G_BEGIN_DECLS
#define META_TYPE_CULLABLE (meta_cullable_get_type ())
#define META_CULLABLE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_CULLABLE, MetaCullable))
#define META_IS_CULLABLE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_CULLABLE))
#define META_CULLABLE_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), META_TYPE_CULLABLE, MetaCullableInterface))
typedef struct _MetaCullable MetaCullable;
typedef struct _MetaCullableInterface MetaCullableInterface;
struct _MetaCullableInterface
{
GTypeInterface g_iface;
void (* cull_out) (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region);
void (* reset_culling) (MetaCullable *cullable);
};
GType meta_cullable_get_type (void);
void meta_cullable_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region);
void meta_cullable_reset_culling (MetaCullable *cullable);
/* Utility methods for implementations */
void meta_cullable_cull_out_children (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region);
void meta_cullable_reset_culling_children (MetaCullable *cullable);
G_END_DECLS
#endif /* __META_CULLABLE_H__ */

5
src/compositor/meta-window-actor-private.h
View File

@ -55,11 +55,6 @@ void meta_window_actor_set_updates_frozen (MetaWindowActor *self,
void meta_window_actor_queue_frame_drawn (MetaWindowActor *self,
gboolean no_delay_frame);
void meta_window_actor_cull_out (MetaWindowActor *self,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region);
void meta_window_actor_reset_culling (MetaWindowActor *self);
void meta_window_actor_set_unobscured_region (MetaWindowActor *self,
cairo_region_t *unobscured_region);

30
src/compositor/meta-window-actor.c
View File

@ -32,6 +32,7 @@
#include "meta-texture-rectangle.h"
#include "region-utils.h"
#include "monitor-private.h"
#include "meta-cullable.h"
enum {
POSITION_CHANGED,
@ -191,7 +192,10 @@ static void do_send_frame_timings (MetaWindowActor *self,
gint refresh_interval,
gint64 presentation_time);
G_DEFINE_TYPE (MetaWindowActor, meta_window_actor, CLUTTER_TYPE_ACTOR);
static void cullable_iface_init (MetaCullableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaWindowActor, meta_window_actor, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
static void
frame_data_free (FrameData *frame)
@ -1848,11 +1852,12 @@ meta_window_actor_set_clip_region_beneath (MetaWindowActor *self,
}
}
void
meta_window_actor_cull_out (MetaWindowActor *self,
static void
meta_window_actor_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
MetaWindowActor *self = META_WINDOW_ACTOR (cullable);
MetaCompScreen *info = meta_screen_get_compositor_data (self->priv->screen);
/* Don't do any culling for the unredirected window */
@ -1875,16 +1880,10 @@ meta_window_actor_cull_out (MetaWindowActor *self,
meta_window_actor_set_clip_region_beneath (self, clip_region);
}
/**
* meta_window_actor_reset_culling:
* @self: a #MetaWindowActor
*
* Unsets the regions set by meta_window_actor_set_clip_region() and
* meta_window_actor_set_clip_region_beneath()
*/
void
meta_window_actor_reset_culling (MetaWindowActor *self)
static void
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),
@ -1892,6 +1891,13 @@ meta_window_actor_reset_culling (MetaWindowActor *self)
g_clear_pointer (&priv->shadow_clip, cairo_region_destroy);
}
static void
cullable_iface_init (MetaCullableInterface *iface)
{
iface->cull_out = meta_window_actor_cull_out;
iface->reset_culling = meta_window_actor_reset_culling;
}
static void
check_needs_pixmap (MetaWindowActor *self)
{

110
src/compositor/meta-window-group.c
View File

@ -11,8 +11,8 @@
#include "compositor-private.h"
#include "meta-window-actor-private.h"
#include "meta-window-group.h"
#include "meta-background-actor-private.h"
#include "meta-background-group-private.h"
#include "window-private.h"
#include "meta-cullable.h"
struct _MetaWindowGroupClass
{
@ -26,7 +26,10 @@ struct _MetaWindowGroup
MetaScreen *screen;
};
G_DEFINE_TYPE (MetaWindowGroup, meta_window_group, CLUTTER_TYPE_ACTOR);
static void cullable_iface_init (MetaCullableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaWindowGroup, meta_window_group, CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
/* Help macros to scale from OpenGL <-1,1> coordinates system to
* window coordinates ranging [0,window-size]. Borrowed from clutter-utils.c
@ -87,103 +90,24 @@ painting_untransformed (MetaWindowGroup *window_group,
}
static void
meta_window_group_cull_out (MetaWindowGroup *group,
meta_window_group_cull_out (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
ClutterActor *actor = CLUTTER_ACTOR (group);
ClutterActor *child;
ClutterActorIter iter;
/* We walk the list from top to bottom (opposite of painting order),
* and subtract the opaque area of each window out of the visible
* region that we pass to the windows below.
*/
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_prev (&iter, &child))
{
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
/* If an actor has effects applied, then that can change the area
* it paints and the opacity, so we no longer can figure out what
* portion of the actor is obscured and what portion of the screen
* it obscures, so we skip the actor.
*
* This has a secondary beneficial effect: if a ClutterOffscreenEffect
* is applied to an actor, then our clipped redraws interfere with the
* caching of the FBO - even if we only need to draw a small portion
* of the window right now, ClutterOffscreenEffect may use other portions
* of the FBO later. So, skipping actors with effects applied also
* prevents these bugs.
*
* Theoretically, we should check clutter_actor_get_offscreen_redirect()
* as well for the same reason, but omitted for simplicity in the
* hopes that no-one will do that.
*/
if (clutter_actor_has_effects (child))
continue;
if (META_IS_WINDOW_ACTOR (child))
{
int x, y;
if (!meta_actor_is_untransformed (child, &x, &y))
continue;
/* Temporarily move to the coordinate system of the actor */
cairo_region_translate (unobscured_region, - x, - y);
cairo_region_translate (clip_region, - x, - y);
meta_window_actor_cull_out (META_WINDOW_ACTOR (child), unobscured_region, clip_region);
cairo_region_translate (unobscured_region, x, y);
cairo_region_translate (clip_region, x, y);
}
else if (META_IS_BACKGROUND_ACTOR (child) ||
META_IS_BACKGROUND_GROUP (child))
{
int x, y;
if (!meta_actor_is_untransformed (child, &x, &y))
continue;
cairo_region_translate (clip_region, - x, - y);
if (META_IS_BACKGROUND_GROUP (child))
meta_background_group_set_clip_region (META_BACKGROUND_GROUP (child), clip_region);
else
meta_background_actor_set_clip_region (META_BACKGROUND_ACTOR (child), clip_region);
cairo_region_translate (clip_region, x, y);
}
}
meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
}
static void
meta_window_group_reset_culling (MetaWindowGroup *group)
meta_window_group_reset_culling (MetaCullable *cullable)
{
ClutterActor *actor = CLUTTER_ACTOR (group);
ClutterActor *child;
ClutterActorIter iter;
meta_cullable_reset_culling_children (cullable);
}
/* Now that we are done painting, unset the visible regions (they will
* mess up painting clones of our actors)
*/
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
static void
cullable_iface_init (MetaCullableInterface *iface)
{
if (META_IS_WINDOW_ACTOR (child))
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (child);
meta_window_actor_reset_culling (window_actor);
}
else if (META_IS_BACKGROUND_ACTOR (child))
{
MetaBackgroundActor *background_actor = META_BACKGROUND_ACTOR (child);
meta_background_actor_set_clip_region (background_actor, NULL);
}
}
iface->cull_out = meta_window_group_cull_out;
iface->reset_culling = meta_window_group_reset_culling;
}
static void
@ -265,14 +189,14 @@ meta_window_group_paint (ClutterActor *actor)
cairo_region_subtract_rectangle (clip_region, &unredirected_rect);
}
meta_window_group_cull_out (window_group, unobscured_region, clip_region);
meta_cullable_cull_out (META_CULLABLE (window_group), unobscured_region, clip_region);
cairo_region_destroy (unobscured_region);
cairo_region_destroy (clip_region);
CLUTTER_ACTOR_CLASS (meta_window_group_parent_class)->paint (actor);
meta_window_group_reset_culling (window_group);
meta_cullable_reset_culling (META_CULLABLE (window_group));
}
static gboolean

26
src/compositor/meta-window-group.h
View File

@ -11,29 +11,9 @@
* MetaWindowGroup:
*
* This class is a subclass of ClutterActor with special handling for
* MetaWindowActor/MetaBackgroundActor/MetaBackgroundGroup when painting
* children.
*
* When we are painting a stack of 5-10 maximized windows, the
* standard bottom-to-top method of drawing every actor results in a
* tremendous amount of overdraw and can easily max out the available
* memory bandwidth on a low-end graphics chipset. It's even worse if
* window textures are being accessed over the AGP bus.
*
* The basic technique applied here is to do a pre-pass before painting
* where we walk window from top to bottom and compute the visible area
* at each step by subtracting out the windows above it. The visible
* area is passed to MetaWindowActor which uses it to clip the portion of
* the window which drawn and avoid redrawing the shadow if it is completely
* obscured.
*
* A caveat is that this is ineffective if applications are using ARGB
* visuals, since we have no way of knowing whether a window obscures
* the windows behind it or not. Alternate approaches using the depth
* or stencil buffer rather than client side regions might be able to
* handle alpha windows, but the combination of glAlphaFunc and stenciling
* tends not to be efficient except on newer cards. (And on newer cards
* we have lots of memory and bandwidth.)
* #MetaCullable when painting children. It uses code similar to
* meta_cullable_cull_out_children(), but also has additional special
* cases for the undirected window, and similar.
*/
#define META_TYPE_WINDOW_GROUP (meta_window_group_get_type ())