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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_UI_TEXTURE_CACHE_H
#define ANDROID_UI_TEXTURE_CACHE_H
#include <SkBitmap.h>
#include "Texture.h"
#include "GenerationCache.h"
namespace android {
namespace uirenderer {
/**
* A simple LRU texture cache. The cache has a maximum size expressed in bytes.
* Any texture added to the cache causing the cache to grow beyond the maximum
* allowed size will also cause the oldest texture to be kicked out.
*/
class TextureCache: public OnEntryRemoved<SkBitmap*, Texture*> {
public:
TextureCache(uint32_t maxByteSize);
~TextureCache();
/**
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
*/
void operator()(SkBitmap*& bitmap, Texture*& texture);
/**
* Returns the texture associated with the specified bitmap. If the texture
* cannot be found in the cache, a new texture is generated.
*/
Texture* get(SkBitmap* bitmap);
/**
* Removes the texture associated with the specified bitmap. Returns NULL
* if the texture cannot be found. Upon remove the texture is freed.
*/
void remove(SkBitmap* bitmap);
/**
* Clears the cache. This causes all textures to be deleted.
*/
void clear();
/**
* Sets the maximum size of the cache in bytes.
*/
void setMaxSize(uint32_t maxSize);
/**
* Returns the maximum size of the cache in bytes.
*/
uint32_t getMaxSize();
/**
* Returns the current size of the cache in bytes.
*/
uint32_t getSize();
private:
/**
* Generates the texture from a bitmap into the specified texture structure.
*
* @param regenerate If true, the bitmap data is reuploaded into the texture, but
* no new texture is generated.
*/
void generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate = false);
GenerationCache<SkBitmap*, Texture*> mCache;
uint32_t mSize;
uint32_t mMaxSize;
}; // class TextureCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_UI_TEXTURE_CACHE_H
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