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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <SkBitmap.h>
#include <utils/LruCache.h>
#include <utils/Mutex.h>
#include <utils/Vector.h>
#include "Debug.h"
#include "Texture.h"
namespace android {
namespace uirenderer {
// Defines
// Debug
#define TEXTURE_LOGD(...) ALOGD(__VA_ARGS__)
#define TEXTURE_LOGD(...)
// Classes
class AssetAtlas;
* 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<uint32_t, Texture*> {
TextureCache(uint32_t maxByteSize);
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
void operator()(uint32_t&, Texture*& texture);
* Resets all Textures to not be marked as in use
void resetMarkInUse();
* Attempts to precache the SkBitmap. Returns true if a Texture was successfully
* acquired for the bitmap, false otherwise. If a Texture was acquired it is
* marked as in use.
bool prefetchAndMarkInUse(const SkBitmap* bitmap);
* Returns the texture associated with the specified bitmap. If the texture
* cannot be found in the cache, a new texture is generated.
Texture* get(const SkBitmap* bitmap);
* Returns the texture associated with the specified bitmap. The generated
* texture is not kept in the cache. The caller must destroy the texture.
Texture* getTransient(const SkBitmap* bitmap);
* Removes the texture associated with the specified bitmap. This is meant
* to be called from threads that are not the EGL context thread.
void releaseTexture(const SkBitmap* bitmap);
* Process deferred removals.
void clearGarbage();
* 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();
* Partially flushes the cache. The amount of memory freed by a flush
* is defined by the flush rate.
void flush();
* Indicates the percentage of the cache to retain when a
* memory trim is requested (see Caches::flush).
void setFlushRate(float flushRate);
void setAssetAtlas(AssetAtlas* assetAtlas);
bool canMakeTextureFromBitmap(const SkBitmap* bitmap);
Texture* getCachedTexture(const SkBitmap* bitmap);
* 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(const SkBitmap* bitmap, Texture* texture, bool regenerate = false);
void uploadLoFiTexture(bool resize, const SkBitmap* bitmap, uint32_t width, uint32_t height);
void uploadToTexture(bool resize, GLenum format, GLsizei stride, GLsizei bpp,
GLsizei width, GLsizei height, GLenum type, const GLvoid * data);
void init();
LruCache<uint32_t, Texture*> mCache;
uint32_t mSize;
uint32_t mMaxSize;
GLint mMaxTextureSize;
float mFlushRate;
bool mDebugEnabled;
Vector<uint32_t> mGarbage;
mutable Mutex mLock;
AssetAtlas* mAssetAtlas;
}; // class TextureCache
}; // namespace uirenderer
}; // namespace android