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/*
* Copyright (C) 2015 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_OFFSCREEN_BUFFER_POOL_H
#define ANDROID_HWUI_OFFSCREEN_BUFFER_POOL_H
#include <GpuMemoryTracker.h>
#include "Caches.h"
#include "Texture.h"
#include "utils/Macros.h"
#include <ui/Region.h>
#include <set>
namespace android {
namespace uirenderer {
class RenderState;
/**
* Lightweight alternative to Layer. Owns the persistent state of an offscreen render target, and
* encompasses enough information to draw it back on screen (minus paint properties, which are held
* by LayerOp).
*
* Has two distinct sizes - viewportWidth/viewportHeight describe content area,
* texture.width/.height are actual allocated texture size. Texture will tend to be larger than the
* viewport bounds, since textures are always allocated with width / height as a multiple of 64, for
* the purpose of improving reuse.
*/
class OffscreenBuffer : GpuMemoryTracker {
public:
OffscreenBuffer(RenderState& renderState, Caches& caches,
uint32_t viewportWidth, uint32_t viewportHeight, bool wideColorGamut = false);
~OffscreenBuffer();
Rect getTextureCoordinates();
void dirty(Rect dirtyArea);
// must be called prior to rendering, to construct/update vertex buffer
void updateMeshFromRegion();
// Set by RenderNode for HW layers, TODO for clipped saveLayers
void setWindowTransform(const Matrix4& transform) {
inverseTransformInWindow.loadInverse(transform);
}
static uint32_t computeIdealDimension(uint32_t dimension);
uint32_t getSizeInBytes() { return texture.objectSize(); }
RenderState& renderState;
uint32_t viewportWidth;
uint32_t viewportHeight;
Texture texture;
bool wideColorGamut = false;
// Portion of layer that has been drawn to. Used to minimize drawing area when
// drawing back to screen / parent FBO.
Region region;
Matrix4 inverseTransformInWindow;
// vbo / size of mesh
GLsizei elementCount = 0;
GLuint vbo = 0;
bool hasRenderedSinceRepaint;
};
/**
* Pool of OffscreenBuffers allocated, but not currently in use.
*/
class OffscreenBufferPool {
public:
OffscreenBufferPool();
~OffscreenBufferPool();
WARN_UNUSED_RESULT OffscreenBuffer* get(RenderState& renderState,
const uint32_t width, const uint32_t height, bool wideColorGamut = false);
WARN_UNUSED_RESULT OffscreenBuffer* resize(OffscreenBuffer* layer,
const uint32_t width, const uint32_t height);
void putOrDelete(OffscreenBuffer* layer);
/**
* Clears the pool. This causes all layers to be deleted.
*/
void clear();
/**
* Returns the maximum size of the pool in bytes.
*/
uint32_t getMaxSize() { return mMaxSize; }
/**
* Returns the current size of the pool in bytes.
*/
uint32_t getSize() { return mSize; }
size_t getCount() { return mPool.size(); }
/**
* Prints out the content of the pool.
*/
void dump();
private:
struct Entry {
Entry() {}
Entry(const uint32_t layerWidth, const uint32_t layerHeight, bool wideColorGamut)
: width(OffscreenBuffer::computeIdealDimension(layerWidth))
, height(OffscreenBuffer::computeIdealDimension(layerHeight))
, wideColorGamut(wideColorGamut) {}
explicit Entry(OffscreenBuffer* layer)
: layer(layer)
, width(layer->texture.width())
, height(layer->texture.height())
, wideColorGamut(layer->wideColorGamut) {
}
static int compare(const Entry& lhs, const Entry& rhs);
bool operator==(const Entry& other) const {
return compare(*this, other) == 0;
}
bool operator!=(const Entry& other) const {
return compare(*this, other) != 0;
}
bool operator<(const Entry& other) const {
return Entry::compare(*this, other) < 0;
}
OffscreenBuffer* layer = nullptr;
uint32_t width = 0;
uint32_t height = 0;
bool wideColorGamut = false;
}; // struct Entry
std::multiset<Entry> mPool;
uint32_t mSize = 0;
uint32_t mMaxSize;
}; // class OffscreenBufferCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_OFFSCREEN_BUFFER_POOL_H
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