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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 TransferQueue_h
#define TransferQueue_h
#if USE(ACCELERATED_COMPOSITING)
#include "BaseTile.h"
#include "BaseTileTexture.h"
#include "ShaderProgram.h"
#include "TiledPage.h"
namespace WebCore {
struct GLState {
GLint viewport[4];
GLboolean scissor[1];
GLboolean depth[1];
GLfloat clearColor[4];
};
class TransferQueue {
public:
TransferQueue();
~TransferQueue();
void updateDirtyBaseTiles();
void initSharedSurfaceTextures(int width, int height);
void updateQueueWithBitmap(const TileRenderInfo* renderInfo, int x, int y,
const SkBitmap& bitmap);
void discardQueue();
void addItemInTransferQueue(const TileRenderInfo* info);
// Check if the item @ index is ready for update.
// The lock will be done when returning true.
bool readyForUpdate();
// This queue can be accessed from UI and TexGen thread, therefore, we need
// a lock to protect its access
TileTransferData* m_transferQueue;
// We are using wait/signal to handle our own queue sync.
// First of all, if we don't have our own lock, then while WebView is
// destroyed, the UI thread will wait for the Tex Gen to get out from
// dequeue operation, which will not succeed. B/c at this moment, we
// already lost the GL Context.
// Now we maintain a counter, which is m_emptyItemCount. When this reach
// 0, then we need the Tex Gen thread to wait. UI thread can signal this
// wait after calling updateTexImage at the draw call , or after WebView
// is destroyed.
android::Mutex m_transferQueueItemLocks;
sp<ANativeWindow> m_ANW;
private:
bool getHasGLContext();
void setHasGLContext(bool hasContext);
int getNextTransferQueueIndex();
// Save and restore the GL State while switching from/to FBO.
void saveGLState();
void setGLStateForCopy(int width, int height);
void restoreGLState();
// Check the current transfer queue item is obsolete or not.
bool checkObsolete(int index);
// Before each draw call and the blit operation, clean up all the
// pendingDiscard items.
void cleanupTransportQueue();
void blitTileFromQueue(GLuint fboID, BaseTileTexture* destTex,
GLuint srcTexId, GLenum srcTexTarget);
// Note that the m_transferQueueIndex only changed in the TexGen thread
// where we are going to move on to update the next item in the queue.
int m_transferQueueIndex;
GLuint m_fboID; // The FBO used for copy the SurfTex to each tile
GLuint m_sharedSurfaceTextureId;
// GLContext can be lost when WebView destroyed.
bool m_hasGLContext;
GLState m_GLStateBeforeBlit;
sp<android::SurfaceTexture> m_sharedSurfaceTexture;
android::Condition m_transferQueueItemCond;
int m_emptyItemCount;
};
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // TransferQueue_h
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