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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_HWUI_TEXTURE_CACHE_H
#define ANDROID_HWUI_TEXTURE_CACHE_H
#include <SkBitmap.h>
#include <cutils/compiler.h>
#include <utils/LruCache.h>
#include <utils/Mutex.h>
#include "Debug.h"
#include <vector>
#include <unordered_map>
namespace android {
class Bitmap;
namespace uirenderer {
class Texture;
///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////
// Debug
#if DEBUG_TEXTURES
#define TEXTURE_LOGD(...) ALOGD(__VA_ARGS__)
#else
#define TEXTURE_LOGD(...)
#endif
///////////////////////////////////////////////////////////////////////////////
// Classes
///////////////////////////////////////////////////////////////////////////////
/**
* 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*> {
public:
TextureCache();
~TextureCache();
/**
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
*/
void operator()(uint32_t&, Texture*& texture) override;
/**
* Resets all Textures to not be marked as in use
*/
void resetMarkInUse(void* ownerToken);
/**
* 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(void* ownerToken, Bitmap* bitmap);
/**
* Attempts to precache the SkBitmap. Returns true if a Texture was successfully
* acquired for the bitmap, false otherwise. Does not mark the Texture
* as in use and won't update currently in-use Textures.
*/
bool prefetch(Bitmap* bitmap);
/**
* Returns the texture associated with the specified bitmap from within the cache.
* If the texture cannot be found in the cache, a new texture is generated.
*/
Texture* get(Bitmap* bitmap);
/**
* Removes the texture associated with the specified pixelRef. Must be called from RenderThread
* Returns true if a texture was destroyed, false if no texture with that id was found
*/
bool destroyTexture(uint32_t pixelRefStableID);
/**
* Clears the cache. This causes all textures to be deleted.
*/
void clear();
/**
* 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();
private:
bool canMakeTextureFromBitmap(Bitmap* bitmap);
Texture* getCachedTexture(Bitmap* bitmap);
Texture* createTexture(Bitmap* bitmap);
LruCache<uint32_t, Texture*> mCache;
uint32_t mSize;
const uint32_t mMaxSize;
GLint mMaxTextureSize;
const float mFlushRate;
bool mDebugEnabled;
std::unordered_map<uint32_t, std::unique_ptr<Texture>> mHardwareTextures;
}; // class TextureCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_TEXTURE_CACHE_H
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