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/*
* Copyright 2011, 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 UpdateManager_h
#define UpdateManager_h
class SkCanvas;
class SkRegion;
namespace WebCore {
class BaseTile;
// UpdateManager Architecture
// The UpdateManager is used to defer updates and invalidations to a layer,
// so that the layer can finish painting one version completely without being
// interrupted by new invals/content
class UpdateManager {
public:
UpdateManager();
~UpdateManager();
// swap deferred members in place of painting members
void swap();
void updateInval(const SkRegion& invalRegion);
void updatePicture(SkPicture* picture);
bool paint(BaseTile* tile, SkCanvas* canvas, unsigned int* pictureUsed);
void clearPaintingInval();
const SkRegion& getPaintingInval() {
return m_paintingInval;
}
SkPicture* getPaintingPicture() {
// NOTE: only modified on UI thread, so UI thread access doesn't need mutex
return m_paintingPicture;
}
private:
// protect m_paintingPicture
// swap() on UI thread modifies
// paint() on texture gen thread reads
android::Mutex m_paintingPictureSync;
SkPicture* m_paintingPicture;
// inval region to be redrawn with the current paintingPicture
SkRegion m_paintingInval;
// most recently received picture, moved into painting on swap()
SkPicture* m_deferredPicture;
// all invals since last swap(), merged with painting inval on swap()
SkRegion m_deferredInval;
};
} // namespace WebCore
#endif //#define UpdateManager_h
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