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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 <SkBitmap.h>
class SkCanvas;
namespace WebCore {
class BaseTile;
class PaintingInfo {
public:
PaintingInfo() : m_x(-1), m_y(-1), m_webview(0), m_picture(0) { }
PaintingInfo(int x, int y, GLWebViewState* webview)
: m_x(x)
, m_y(y)
, m_webview(webview)
, m_picture(0)
{
if(webview)
m_picture = webview->currentPictureCounter();
}
bool operator==(const PaintingInfo& info)
{
return m_webview == info.m_webview
&& m_x == info.m_x
&& m_y == info.m_y
&& m_picture == info.m_picture;
}
bool similar(const PaintingInfo& info)
{
return m_webview == info.m_webview
&& m_x == info.m_x
&& m_y == info.m_y;
}
void setPosition(int x, int y) { m_x = x; m_y = y; }
void setGLWebViewState(GLWebViewState* webview) { m_webview = webview; }
void setPictureUsed(unsigned int picture) { m_picture = picture; }
private:
int m_x;
int m_y;
GLWebViewState* m_webview;
unsigned int m_picture;
};
// 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::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.
void producerUpdate(BaseTile* painter, TextureInfo* textureInfo, PaintingInfo& info);
// 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) { android::Mutex::Autolock lock(m_varLock); m_usedLevel = used; }
// assigns ownership of the texture to the tile if possible
bool acquire(BaseTile* owner);
// private member accessor functions
BaseTile* owner() { android::Mutex::Autolock lock(m_varLock); return m_owner; }
BaseTile* painter() { return m_painter; }
SkCanvas* canvas() { return m_canvas; }
// checks to see if the current readable texture equals the provided PaintingInfo
bool consumerTextureUpToDate(PaintingInfo& info);
// checks to see if the current readable texture is similar to the provided PaintingInfo
bool consumerTextureSimilar(PaintingInfo& info);
bool busy() { return m_busy; }
private:
SkBitmap m_bitmap;
SkCanvas* m_canvas;
int m_usedLevel;
BaseTile* m_owner;
BaseTile* m_painter;
PaintingInfo m_paintingInfoA;
PaintingInfo m_paintingInfoB;
bool m_busy;
android::Mutex m_varLock;
};
} // namespace WebCore
#endif // BackedDoubleBufferedTexture_h
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