90 lines
2.6 KiB
C++
90 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_GRADIENT_CACHE_H
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#define ANDROID_UI_GRADIENT_CACHE_H
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#include <SkShader.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 gradient 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 GradientCache: public OnEntryRemoved<SkShader*, Texture*> {
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public:
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GradientCache(uint32_t maxByteSize);
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~GradientCache();
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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()(SkShader*& shader, Texture*& texture);
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/**
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* Adds a new linear gradient to the cache. The generated texture is
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* returned.
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*/
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Texture* addLinearGradient(SkShader* shader, float* bounds, uint32_t* colors,
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float* positions, int count, SkShader::TileMode tileMode);
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/**
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* Returns the texture associated with the specified shader.
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*/
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Texture* get(SkShader* shader);
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/**
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* Removes the texture associated with the specified shader. 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(SkShader* shader);
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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(uint32_t 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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uint32_t 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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uint32_t getSize();
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private:
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void generateTexture(SkBitmap* bitmap, Texture* texture);
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GenerationCache<SkShader*, Texture*> mCache;
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uint32_t mSize;
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uint32_t mMaxSize;
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}; // class GradientCache
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_UI_GRADIENT_CACHE_H
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