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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 "Debug.h"
#include "Layer.h"
#include "utils/SortedList.h"
namespace android {
namespace uirenderer {
// Defines
// Indicates whether to remove the biggest layers first, or the smaller ones
// Textures used by layers must have dimensions multiples of this number
#define LAYER_SIZE 64
// Debug
#define LAYER_LOGD(...) LOGD(__VA_ARGS__)
#define LAYER_LOGD(...)
// Cache
class LayerCache {
* Returns a layer large enough for the specified dimensions. If no 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 width The desired width of the layer
* @param width The desired height of the layer
Layer* get(const uint32_t width, const uint32_t height);
* Adds the layer to the cache. The layer will not be added if there is
* not enough space available. Adding a layer can cause other layers to
* be removed from the cache.
* @param layer The layer to add to the cache
* @return True if the layer was added, false otherwise.
bool put(Layer* layer);
* Clears the cache. This causes all layers to be deleted.
void clear();
* Resize the specified layer if needed.
* @param layer The layer to resize
* @param width The new width of the layer
* @param height The new height of the layer
* @return True if the layer was resized or nothing happened, false if
* a failure occurred during the resizing operation
bool resize(Layer* layer, const uint32_t width, const uint32_t height);
* 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();
void deleteLayer(Layer* layer);
struct LayerEntry {
mLayer(NULL), mWidth(0), mHeight(0) {
LayerEntry(const uint32_t layerWidth, const uint32_t layerHeight): mLayer(NULL) {
mWidth = uint32_t(ceilf(layerWidth / float(LAYER_SIZE)) * LAYER_SIZE);
mHeight = uint32_t(ceilf(layerHeight / float(LAYER_SIZE)) * LAYER_SIZE);
LayerEntry(const LayerEntry& entry):
mLayer(entry.mLayer), mWidth(entry.mWidth), mHeight(entry.mHeight) {
LayerEntry(Layer* layer):
mLayer(layer), mWidth(layer->width), mHeight(layer->height) {
bool operator<(const LayerEntry& rhs) const {
if (mWidth == rhs.mWidth) {
return mHeight < rhs.mHeight;
return mWidth < rhs.mWidth;
bool operator==(const LayerEntry& rhs) const {
return mWidth == rhs.mWidth && mHeight == rhs.mHeight;
Layer* mLayer;
uint32_t mWidth;
uint32_t mHeight;
}; // struct LayerEntry
SortedList<LayerEntry> mCache;
uint32_t mSize;
uint32_t mMaxSize;
}; // class LayerCache
}; // namespace uirenderer
}; // namespace android