a4a688ed83
The old requirement that multiple MetaBackgroundActor objects be layered on top of each to produce blended backgrounds resulted in extremely inefficient drawing since the entire framebuffer had to be read and written multiple times. * Replace the MetaBackground ClutterContent with a plain GObject that serves to hold the background parameters and prerender textures to be used to draw the background. It handles colors, gradients, and blended images, but does not handle vignetting * Add vignetting to MetaBackgroundActor directly. * Add MetaBackgroundImage and MetaBackgroundImageCache to allow multiple MetaBackground objects to share the same images By removing the usage of ClutterContent, the following optimizations were easy to add: Blending is turned off when the actor is fully opaque Nearest-neighbour filtering is used when drawing 1:1 The GLSL vignette code is slightly improved to use a vertex shader snippet for computing the texture coordinate => position in actor mapping. https://bugzilla.gnome.org/show_bug.cgi?id=735637
76 lines
3.9 KiB
C
76 lines
3.9 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* MetaBackgroundImageCache:
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*
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* Simple cache for background textures loaded from files
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*
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* Copyright 2014 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __META_BACKGROUND_IMAGE_H__
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#define __META_BACKGROUND_IMAGE_H__
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#include <glib-object.h>
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#include <cogl/cogl.h>
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#define META_TYPE_BACKGROUND_IMAGE (meta_background_image_get_type ())
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#define META_BACKGROUND_IMAGE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_BACKGROUND_IMAGE, MetaBackgroundImage))
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#define META_BACKGROUND_IMAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_BACKGROUND_IMAGE, MetaBackgroundImageClass))
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#define META_IS_BACKGROUND_IMAGE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_BACKGROUND_IMAGE))
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#define META_IS_BACKGROUND_IMAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_BACKGROUND_IMAGE))
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#define META_BACKGROUND_IMAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_BACKGROUND_IMAGE, MetaBackgroundImageClass))
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/**
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* MetaBackgroundImage:
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*
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* #MetaBackgroundImage is an object that represents a loaded or loading background image.
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*/
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typedef struct _MetaBackgroundImage MetaBackgroundImage;
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typedef struct _MetaBackgroundImageClass MetaBackgroundImageClass;
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GType meta_background_image_get_type (void);
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gboolean meta_background_image_is_loaded (MetaBackgroundImage *image);
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gboolean meta_background_image_get_success (MetaBackgroundImage *image);
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CoglTexture *meta_background_image_get_texture (MetaBackgroundImage *image);
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#define META_TYPE_BACKGROUND_IMAGE_CACHE (meta_background_image_cache_get_type ())
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#define META_BACKGROUND_IMAGE_CACHE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_BACKGROUND_IMAGE_CACHE, MetaBackgroundImageCache))
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#define META_BACKGROUND_IMAGE_CACHE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_BACKGROUND_IMAGE_CACHE, MetaBackgroundImageCacheClass))
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#define META_IS_BACKGROUND_IMAGE_CACHE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_BACKGROUND_IMAGE_CACHE))
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#define META_IS_BACKGROUND_IMAGE_CACHE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_BACKGROUND_IMAGE_CACHE))
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#define META_BACKGROUND_IMAGE_CACHE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_BACKGROUND_IMAGE_CACHE, MetaBackgroundImageCacheClass))
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/**
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* MetaBackgroundImageCache:
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*
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* #MetaBackgroundImageCache caches loading of textures for backgrounds; there's actually
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* nothing background specific about it, other than it is tuned to work well for
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* large images as typically are used for backgrounds.
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*/
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typedef struct _MetaBackgroundImageCache MetaBackgroundImageCache;
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typedef struct _MetaBackgroundImageCacheClass MetaBackgroundImageCacheClass;
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MetaBackgroundImageCache *meta_background_image_cache_get_default (void);
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GType meta_background_image_cache_get_type (void);
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MetaBackgroundImage *meta_background_image_cache_load (MetaBackgroundImageCache *cache,
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const char *filename);
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void meta_background_image_cache_purge (MetaBackgroundImageCache *cache,
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const char *filename);
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#endif /* __META_BACKGROUND_IMAGE_H__ */
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