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/*
* Copyright (C) 2011, 2012 Research In Motion Limited. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef TextureCacheCompositingThread_h
#define TextureCacheCompositingThread_h
#if USE(ACCELERATED_COMPOSITING)
#include "Color.h"
#include "LayerTileIndex.h"
#include "Texture.h"
#include <wtf/HashMap.h>
#include <wtf/ListHashSet.h>
#include <wtf/Noncopyable.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class IntRect;
// A LRU cache for OpenGL textures.
class TextureCacheCompositingThread {
WTF_MAKE_NONCOPYABLE(TextureCacheCompositingThread);
WTF_MAKE_FAST_ALLOCATED;
public:
friend TextureCacheCompositingThread* textureCacheCompositingThread();
// Creates a new texture managed by this cache.
PassRefPtr<Texture> createTexture()
{
return Texture::create();
}
// Retrieve a texture from the cache.
PassRefPtr<Texture> textureForTiledContents(const SkBitmap& contents, const IntRect& tileRect, const TileIndex&, bool isOpaque);
PassRefPtr<Texture> textureForColor(const Color&);
// Update contents of an existing texture, or create a new one if texture is 0.
PassRefPtr<Texture> updateContents(const RefPtr<Texture>&, const SkBitmap& contents, const IntRect& dirtyRect, const IntRect& tileRect, bool isOpaque);
size_t memoryUsage() const { return m_memoryUsage; }
size_t memoryLimit() const { return m_memoryLimit; }
void setMemoryLimit(size_t limit) { m_memoryLimit = limit; }
// Evict unprotected textures until we reach the limit provided.
void prune(size_t limit);
void prune() { prune(memoryLimit()); }
// Evict all textures from the cache.
void clear();
// Update the LRU list.
void textureAccessed(Texture*);
// Deleting destroyed textures is provided as a separate method, because
// there might not be an OpenGL context current when the texture destructor
// was called. Calling this makes sure to free any such textures.
void collectGarbage();
void textureDestroyed(Texture*);
void textureResized(Texture*, const IntSize& oldSize);
// Undo the effects of eviction, if possible.
bool install(Texture*);
private:
struct ZombieTexture {
explicit ZombieTexture(Texture* texture)
: id(texture->textureId())
, size(texture->size())
{
}
unsigned id;
IntSize size;
};
typedef ListHashSet<Texture* > TextureSet;
typedef std::pair<uint32_t, size_t> ContentsKey;
typedef HashMap<TileIndex, RefPtr<Texture> > TextureMap;
typedef Vector<ZombieTexture> Garbage;
TextureCacheCompositingThread();
~TextureCacheCompositingThread();
unsigned allocateTextureId();
void freeTextureId(unsigned id);
void incMemoryUsage(int delta) { setMemoryUsage(memoryUsage() + delta); }
void decMemoryUsage(int delta) { setMemoryUsage(memoryUsage() - delta); }
void setMemoryUsage(size_t);
ContentsKey key(const SkBitmap& contents);
void evict(const TextureSet::iterator&);
// LRU set of weak pointers to textures.
TextureSet m_textures;
size_t m_memoryUsage;
size_t m_memoryLimit;
// Map of refCounted pointers to textures.
HashMap<ContentsKey, TextureMap> m_cache;
struct ColorHash {
static unsigned hash(const Color& key) { return WTF::intHash(key.rgb()); }
static bool equal(const Color& a, const Color& b) { return a == b; }
static const bool safeToCompareToEmptyOrDeleted = true;
};
struct ColorHashTraits : WTF::GenericHashTraits<Color> {
static const bool emptyValueIsZero = true;
// The deleted value is an invalid color with an RGB value of 0xFFFFFFFF.
// Such values do not naturally occur as colors.
// And empty value is an invalid color with an RGB value of 0x0.
static void constructDeletedValue(Color& slot) { new (&slot) Color(); *reinterpret_cast<RGBA32*>(&slot) = Color::white; }
static bool isDeletedValue(const Color& value) { return !value.isValid() && value.rgb() == Color::white; }
};
typedef HashMap<Color, RefPtr<Texture>, ColorHash, ColorHashTraits> ColorTextureMap;
ColorTextureMap m_colors;
Garbage m_garbage;
};
TextureCacheCompositingThread* textureCacheCompositingThread();
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // TextureCacheCompositingThread_h
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