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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/**
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* SECTION:meta-background-group
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* @title: MetaBackgroundGroup
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* @short_description: Container for background actors
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*
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* This class is a subclass of ClutterActor with special handling for
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* MetaBackgroundActor/MetaBackgroundGroup when painting children.
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* It makes sure to only draw the parts of the backgrounds not
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* occluded by opaque windows.
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*
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* See #MetaWindowGroup for more information behind the motivation,
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* and details on implementation.
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*/
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#include <config.h>
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#include "compositor-private.h"
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#include "clutter-utils.h"
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#include "meta-background-actor-private.h"
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#include "meta-background-group-private.h"
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G_DEFINE_TYPE (MetaBackgroundGroup, meta_background_group, CLUTTER_TYPE_ACTOR);
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static void
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meta_background_group_class_init (MetaBackgroundGroupClass *klass)
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{
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}
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static void
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meta_background_group_init (MetaBackgroundGroup *self)
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{
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}
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/**
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* meta_background_group_set_clip_region:
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* @self: a #MetaBackgroundGroup
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* @region: (allow-none): the parts of the background to paint
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*
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* Sets the area of the backgrounds that is unobscured by overlapping windows.
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* This is used to optimize and only paint the visible portions.
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*/
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void
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meta_background_group_set_clip_region (MetaBackgroundGroup *self,
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cairo_region_t *region)
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{
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ClutterActor *child;
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for (child = clutter_actor_get_first_child (CLUTTER_ACTOR (self));
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child != NULL;
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child = clutter_actor_get_next_sibling (child))
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{
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if (META_IS_BACKGROUND_ACTOR (child))
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{
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meta_background_actor_set_clip_region (META_BACKGROUND_ACTOR (child), region);
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}
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else if (META_IS_BACKGROUND_GROUP (child))
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{
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int x, y;
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if (!meta_actor_is_untransformed (child, &x, &y))
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continue;
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cairo_region_translate (region, -x, -y);
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meta_background_group_set_clip_region (META_BACKGROUND_GROUP (child), region);
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cairo_region_translate (region, x, y);
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}
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}
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}
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ClutterActor *
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meta_background_group_new (void)
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{
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MetaBackgroundGroup *background_group;
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background_group = g_object_new (META_TYPE_BACKGROUND_GROUP, NULL);
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return CLUTTER_ACTOR (background_group);
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}
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