121e224256
The texture cache was previously checking the number of stored textures. This was not very useful as this could easily lead to an abuse of memory. The new cache instead tracks the total size occupied in RAM by the cached textures. When a new texture is generated, older textures are kicked out as needed. Change-Id: Ib27142f4a018d5bf84774c1fb6f45a67a85f20bc
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_UI_TEXTURE_CACHE_H
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#define ANDROID_UI_TEXTURE_CACHE_H
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#include <SkBitmap.h>
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#include "Texture.h"
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#include "GenerationCache.h"
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namespace android {
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namespace uirenderer {
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/**
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* A simple LRU texture cache. The cache has a maximum size expressed in bytes.
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* Any texture added to the cache causing the cache to grow beyond the maximum
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* allowed size will also cause the oldest texture to be kicked out.
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*/
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class TextureCache: public OnEntryRemoved<SkBitmap*, Texture*> {
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public:
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TextureCache(unsigned int maxByteSize);
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~TextureCache();
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/**
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* Used as a callback when an entry is removed from the cache.
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* Do not invoke directly.
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*/
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void operator()(SkBitmap* bitmap, Texture* texture);
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/**
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* Returns the texture associated with the specified bitmap. If the texture
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* cannot be found in the cache, a new texture is generated.
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*/
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Texture* get(SkBitmap* bitmap);
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/**
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* Removes the texture associated with the specified bitmap. Returns NULL
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* if the texture cannot be found. Upon remove the texture is freed.
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*/
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void remove(SkBitmap* bitmap);
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/**
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* Clears the cache. This causes all textures to be deleted.
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*/
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void clear();
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/**
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* Sets the maximum size of the cache in bytes.
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*/
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void setMaxSize(unsigned int maxSize);
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/**
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* Returns the maximum size of the cache in bytes.
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*/
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unsigned int getMaxSize();
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/**
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* Returns the current size of the cache in bytes.
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*/
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unsigned int getSize();
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private:
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/**
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* Generates the texture from a bitmap into the specified texture structure.
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*
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* @param regenerate If true, the bitmap data is reuploaded into the texture, but
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* no new texture is generated.
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*/
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void generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate = false);
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GenerationCache<SkBitmap, Texture> mCache;
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unsigned int mSize;
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unsigned int mMaxSize;
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}; // class TextureCache
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_UI_TEXTURE_CACHE_H
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