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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_UI_LAYER_CACHE_H
#define ANDROID_UI_LAYER_CACHE_H
#include "Layer.h"
#include "GenerationCache.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////
// Debug
#define DEBUG_LAYERS 0
// Debug
#if DEBUG_LAYERS
#define LAYER_LOGD(...) LOGD(__VA_ARGS__)
#else
#define LAYER_LOGD(...)
#endif
///////////////////////////////////////////////////////////////////////////////
// Cache
///////////////////////////////////////////////////////////////////////////////
class LayerCache: public OnEntryRemoved<LayerSize, Layer*> {
public:
LayerCache();
LayerCache(uint32_t maxByteSize);
~LayerCache();
/**
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
*/
void operator()(LayerSize& size, Layer*& layer);
/**
* Returns the layer of specified dimensions. If not suitable layer
* can be found, a new one is created and returned. If creating a new
* layer fails, NULL is returned.
*
* When a layer is obtained from the cache, it is removed and the total
* size of the cache goes down.
*
* @param size The dimensions of the desired layer
* @param previousFbo The name of the FBO to bind to if creating a new
* layer fails
*/
Layer* get(LayerSize& size, GLuint previousFbo);
/**
* Adds the layer to the cache. The layer will not be added if there is
* not enough space available.
*
* @param size The dimensions of the layer
* @param layer The layer to add to the cache
*
* @return True if the layer was added, false otherwise.
*/
bool put(LayerSize& size, Layer* layer);
/**
* Clears the cache. This causes all layers 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();
private:
void deleteLayer(Layer* layer);
GenerationCache<LayerSize, Layer*> mCache;
uint32_t mIdGenerator;
uint32_t mSize;
uint32_t mMaxSize;
}; // class LayerCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_UI_LAYER_CACHE_H
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