daba05f6a7
This does better reflect what this region is used for. https://bugzilla.gnome.org/show_bug.cgi?id=703332
110 lines
3.2 KiB
C
110 lines
3.2 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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struct _MetaBackgroundGroupPrivate
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{
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gpointer dummy;
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};
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static void
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meta_background_group_dispose (GObject *object)
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{
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G_OBJECT_CLASS (meta_background_group_parent_class)->dispose (object);
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}
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static gboolean
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meta_background_group_get_paint_volume (ClutterActor *actor,
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ClutterPaintVolume *volume)
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{
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return clutter_paint_volume_set_from_allocation (volume, actor);
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}
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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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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
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actor_class->get_paint_volume = meta_background_group_get_paint_volume;
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object_class->dispose = meta_background_group_dispose;
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g_type_class_add_private (klass, sizeof (MetaBackgroundGroupPrivate));
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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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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
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META_TYPE_BACKGROUND_GROUP,
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MetaBackgroundGroupPrivate);
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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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GList *children, *l;
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children = clutter_actor_get_children (CLUTTER_ACTOR (self));
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for (l = children; l; l = l->next)
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{
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ClutterActor *actor = l->data;
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if (META_IS_BACKGROUND_ACTOR (actor))
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{
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meta_background_actor_set_clip_region (META_BACKGROUND_ACTOR (actor), region);
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}
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else if (META_IS_BACKGROUND_GROUP (actor))
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{
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int x, y;
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if (!meta_actor_is_untransformed (actor, &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 (actor), region);
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cairo_region_translate (region, x, y);
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}
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}
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g_list_free (children);
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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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