| /* |
| * 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_LAYER_CACHE_H |
| #define ANDROID_HWUI_LAYER_CACHE_H |
| |
| #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 |
| #define LAYER_REMOVE_BIGGEST 0 |
| // Textures used by layers must have dimensions multiples of this number |
| #define LAYER_SIZE 64 |
| |
| // Debug |
| #if DEBUG_LAYERS |
| #define LAYER_LOGD(...) LOGD(__VA_ARGS__) |
| #else |
| #define LAYER_LOGD(...) |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Cache |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class LayerCache { |
| public: |
| LayerCache(); |
| ~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(); |
| |
| private: |
| void deleteLayer(Layer* layer); |
| |
| struct LayerEntry { |
| 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->getWidth()), mHeight(layer->getHeight()) { |
| } |
| |
| 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 |
| |
| #endif // ANDROID_HWUI_LAYER_CACHE_H |