151 lines
4.3 KiB
C++
151 lines
4.3 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_HWUI_TEXTURE_CACHE_H
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#define ANDROID_HWUI_TEXTURE_CACHE_H
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#include <SkBitmap.h>
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#include <utils/LruCache.h>
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#include <utils/Mutex.h>
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#include <utils/Vector.h>
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#include "Debug.h"
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#include "Texture.h"
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namespace android {
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namespace uirenderer {
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///////////////////////////////////////////////////////////////////////////////
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// Defines
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///////////////////////////////////////////////////////////////////////////////
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// Debug
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#if DEBUG_TEXTURES
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#define TEXTURE_LOGD(...) ALOGD(__VA_ARGS__)
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#else
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#define TEXTURE_LOGD(...)
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#endif
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///////////////////////////////////////////////////////////////////////////////
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// Classes
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///////////////////////////////////////////////////////////////////////////////
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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();
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TextureCache(uint32_t 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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* Returns the texture associated with the specified bitmap. The generated
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* texture is not kept in the cache. The caller must destroy the texture.
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*/
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Texture* getTransient(SkBitmap* bitmap);
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/**
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* Removes the texture associated with the specified bitmap.
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* 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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* Removes the texture associated with the specified bitmap. This is meant
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* to be called from threads that are not the EGL context thread.
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*/
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void removeDeferred(SkBitmap* bitmap);
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/**
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* Process deferred removals.
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*/
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void clearGarbage();
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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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/**
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* Partially flushes the cache. The amount of memory freed by a flush
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* is defined by the flush rate.
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*/
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void flush();
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/**
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* Indicates the percentage of the cache to retain when a
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* memory trim is requested (see Caches::flush).
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*/
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void setFlushRate(float flushRate);
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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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void uploadLoFiTexture(bool resize, SkBitmap* bitmap, uint32_t width, uint32_t height);
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void uploadToTexture(bool resize, GLenum format, GLsizei width, GLsizei height,
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GLenum type, const GLvoid * data);
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void init();
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LruCache<SkBitmap*, Texture*> mCache;
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uint32_t mSize;
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uint32_t mMaxSize;
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GLint mMaxTextureSize;
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float mFlushRate;
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bool mDebugEnabled;
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Vector<SkBitmap*> mGarbage;
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mutable Mutex mLock;
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}; // class TextureCache
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_TEXTURE_CACHE_H
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