74e43a4702
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
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
|
|
|
|
/**
|
|
* SECTION:meta-background-group
|
|
* @title: MetaBackgroundGroup
|
|
* @short_description: Container for background actors
|
|
*
|
|
* This class is a subclass of ClutterActor with special handling for
|
|
* MetaBackgroundActor/MetaBackgroundGroup when painting children.
|
|
* It makes sure to only draw the parts of the backgrounds not
|
|
* occluded by opaque windows.
|
|
*
|
|
* See #MetaWindowGroup for more information behind the motivation,
|
|
* and details on implementation.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <meta/meta-background-group.h>
|
|
#include "meta-cullable.h"
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
ClutterActor *
|
|
meta_background_group_new (void)
|
|
{
|
|
MetaBackgroundGroup *background_group;
|
|
|
|
background_group = g_object_new (META_TYPE_BACKGROUND_GROUP, NULL);
|
|
|
|
return CLUTTER_ACTOR (background_group);
|
|
}
|