8d4aeb7111
Bug #7146141 This new cache is used in a similar way to LayerCache. It helps reuse already allocated stencil buffers and thus avoid churning memory on every frame. Change-Id: I19551d72da52c40039e65904563600e492c8b193
131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_HWUI_RENDER_BUFFER_CACHE_H
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#define ANDROID_HWUI_RENDER_BUFFER_CACHE_H
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#include <GLES2/gl2.h>
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#include "RenderBuffer.h"
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#include "utils/SortedList.h"
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namespace android {
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namespace uirenderer {
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class RenderBufferCache {
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public:
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RenderBufferCache();
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~RenderBufferCache();
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/**
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* Returns a buffer with the exact specified dimensions. If no suitable
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* buffer can be found, a new one is created and returned. If creating a
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* new buffer fails, NULL is returned.
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*
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* When a buffer is obtained from the cache, it is removed and the total
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* size of the cache goes down.
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*
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* The returned buffer is always allocated and bound
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* (see RenderBuffer::isAllocated()).
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*
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* @param format The desired render buffer format
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* @param width The desired width of the buffer
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* @param height The desired height of the buffer
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*/
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RenderBuffer* get(GLenum format, const uint32_t width, const uint32_t height);
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/**
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* Adds the buffer to the cache. The buffer will not be added if there is
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* not enough space available. Adding a buffer can cause other buffer to
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* be removed from the cache.
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*
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* @param buffer The render buffer to add to the cache
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*
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* @return True if the buffer was added, false otherwise.
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*/
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bool put(RenderBuffer* buffer);
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/**
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* Clears the cache. This causes all layers to be deleted.
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*/
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void clear();
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/**
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* Sets the maximum size of the cache in bytes.
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*/
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void setMaxSize(uint32_t maxSize);
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/**
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* Returns the maximum size of the cache in bytes.
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*/
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uint32_t getMaxSize();
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/**
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* Returns the current size of the cache in bytes.
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*/
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uint32_t getSize();
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private:
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struct RenderBufferEntry {
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RenderBufferEntry():
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mBuffer(NULL), mWidth(0), mHeight(0) {
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}
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RenderBufferEntry(GLenum format, const uint32_t width, const uint32_t height):
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mBuffer(NULL), mFormat(format), mWidth(width), mHeight(height) {
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}
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RenderBufferEntry(RenderBuffer* buffer):
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mBuffer(buffer), mFormat(buffer->getFormat()),
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mWidth(buffer->getWidth()), mHeight(buffer->getHeight()) {
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}
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static int compare(const RenderBufferEntry& lhs, const RenderBufferEntry& rhs);
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bool operator==(const RenderBufferEntry& other) const {
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return compare(*this, other) == 0;
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}
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bool operator!=(const RenderBufferEntry& other) const {
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return compare(*this, other) != 0;
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}
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friend inline int strictly_order_type(const RenderBufferEntry& lhs,
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const RenderBufferEntry& rhs) {
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return RenderBufferEntry::compare(lhs, rhs) < 0;
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}
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friend inline int compare_type(const RenderBufferEntry& lhs,
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const RenderBufferEntry& rhs) {
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return RenderBufferEntry::compare(lhs, rhs);
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}
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RenderBuffer* mBuffer;
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GLenum mFormat;
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uint32_t mWidth;
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uint32_t mHeight;
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}; // struct RenderBufferEntry
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void deleteBuffer(RenderBuffer* buffer);
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SortedList<RenderBufferEntry> mCache;
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uint32_t mSize;
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uint32_t mMaxSize;
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}; // class RenderBufferCache
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_RENDER_BUFFER_CACHE_H
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