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/*
* Copyright 2010, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef BackedDoubleBufferedTexture_h
#define BackedDoubleBufferedTexture_h
#include "DoubleBufferedTexture.h"
#include "GLWebViewState.h"
#include "TextureOwner.h"
#include <SkBitmap.h>
class SkCanvas;
namespace WebCore {
class BaseTile;
// DoubleBufferedTexture using a SkBitmap as backing mechanism
class BackedDoubleBufferedTexture : public DoubleBufferedTexture {
public:
// This object is to be constructed on the consumer's thread and must have
// a width and height greater than 0.
BackedDoubleBufferedTexture(uint32_t w, uint32_t h,
SkBitmap* bitmap = 0,
SkBitmap::Config config = SkBitmap::kARGB_8888_Config);
virtual ~BackedDoubleBufferedTexture();
// these functions override their parent
virtual TextureInfo* producerLock();
virtual void producerRelease();
virtual void producerReleaseAndSwap();
// updates the texture with current bitmap and releases (and if needed also
// swaps) the texture.
virtual void producerUpdate(TextureInfo* textureInfo);
// The level can be one of the following values:
// * -1 for an unused texture.
// * 0 for the tiles intersecting with the viewport.
// * n where n > 0 for the distance between the viewport and the tile.
// We use this to prioritize the order in which we reclaim textures, see
// TilesManager::getAvailableTexture() for more information.
int usedLevel() { return m_usedLevel; }
void setUsedLevel(int used) { m_usedLevel = used; }
// allows consumer thread to assign ownership of the texture to the tile. It
// returns false if ownership cannot be transferred because the tile is busy
bool acquire(TextureOwner* owner);
void release(TextureOwner* owner);
// set the texture owner if not busy. Return false if busy, true otherwise.
bool setOwner(TextureOwner* owner);
// private member accessor functions
TextureOwner* owner() { return m_owner; } // only used by the consumer thread
SkCanvas* canvas(); // only used by the producer thread
bool busy();
const SkSize& getSize() const { return m_size; }
private:
void destroyTextures(SharedTexture** textures);
SkBitmap* m_bitmap;
bool m_sharedBitmap;
SkSize m_size;
SkCanvas* m_canvas;
int m_usedLevel;
SkBitmap::Config m_config;
TextureOwner* m_owner;
// This values signals that the texture is currently in use by the consumer.
// This allows us to prevent the owner of the texture from changing while the
// consumer is holding a lock on the texture.
bool m_busy;
// We mutex protect the reads/writes of m_busy to ensure that we are reading
// the most up-to-date value even across processors in an SMP system.
android::Mutex m_busyLock;
};
} // namespace WebCore
#endif // BackedDoubleBufferedTexture_h
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