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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 BaseTileTexture_h
#define BaseTileTexture_h
#include "DoubleBufferedTexture.h"
#include "GLWebViewState.h"
#include "TextureOwner.h"
#include "TilePainter.h"
#include <SkBitmap.h>
class SkCanvas;
namespace WebCore {
class BaseTile;
class TextureTileInfo {
public:
TextureTileInfo()
: m_x(-1)
, m_y(-1)
, m_layerId(-1)
, m_scale(0)
, m_texture(0)
, m_painter(0)
, m_picture(0)
{
}
int m_x;
int m_y;
int m_layerId;
float m_scale;
TextureInfo* m_texture;
TilePainter* m_painter;
unsigned int m_picture;
};
// While in the queue, the BaseTile can be re-used, the updated bitmap
// can be discarded. In order to track this obsolete base tiles, we save
// the Tile's Info to make the comparison.
// At the time of base tile's dtor or webview destroy, we want to discard
// all the data in the queue. However, we have to do the Surface Texture
// update in the same GL context as the UI thread. So we mark the status
// as pendingDiscard, and delay the Surface Texture operation to the next
// draw call.
enum TransferItemStatus {
emptyItem = 0, // S.T. buffer ready for new content
pendingBlit = 1, // Ready for bliting into tile's GL Tex.
pendingDiscard = 2 // Waiting for the next draw call to discard
};
class TileTransferData {
public:
TileTransferData()
: status(emptyItem)
, savedBaseTilePtr(0)
{
}
TransferItemStatus status;
BaseTile* savedBaseTilePtr;
TextureTileInfo tileInfo;
};
// DoubleBufferedTexture using a SkBitmap as backing mechanism
class BaseTileTexture : public DoubleBufferedTexture {
public:
// This object is to be constructed on the consumer's thread and must have
// a width and height greater than 0.
BaseTileTexture(uint32_t w, uint32_t h);
virtual ~BaseTileTexture();
// 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, const SkBitmap& bitmap);
// 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, bool force = false);
bool release(TextureOwner* owner);
bool tryAcquire(TextureOwner* owner);
// set the texture owner if not busy. Return false if busy, true otherwise.
bool setOwner(TextureOwner* owner, bool force = false);
// private member accessor functions
TextureOwner* owner() { return m_owner; } // only used by the consumer thread
TextureOwner* delayedReleaseOwner() { return m_delayedReleaseOwner; }
bool busy();
void setNotBusy();
const SkSize& getSize() const { return m_size; }
void setTile(TextureInfo* info, int x, int y, float scale,
TilePainter* painter, unsigned int pictureCount);
bool readyFor(BaseTile* baseTile);
float scale();
GLuint m_ownTextureId;
void setOwnTextureTileInfoFromQueue(const TextureTileInfo* info);
protected:
HashMap<SharedTexture*, TextureTileInfo*> m_texturesInfo;
private:
void destroyTextures(SharedTexture** textures);
TextureTileInfo m_ownTextureTileInfo;
SkSize m_size;
int m_usedLevel;
SkBitmap::Config m_config;
TextureOwner* m_owner;
// When trying to release a texture, we may delay this if the texture is
// currently used (busy being painted). We use the following two variables
// to do so in setNotBusy()
TextureOwner* m_delayedReleaseOwner;
bool m_delayedRelease;
// 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;
// We use this condition variable to signal that the texture
// is not busy anymore
android::Condition m_busyCond;
};
} // namespace WebCore
#endif // BaseTileTexture_h
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