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/*
* Copyright (C) 2011, 2012, 2013 Research In Motion Limited. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LayerTexture_h
#define LayerTexture_h
#if USE(ACCELERATED_COMPOSITING)
#include "GraphicsTypes3D.h"
#include "IntSize.h"
#include <BlackBerryPlatformGraphics.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
class Color;
class IntRect;
class TextureCacheCompositingThread;
// LayerTexture encapsulates a volatile texture - at any time, the underlying OpenGL
// texture may be deleted by the TextureCacheCompositingThread. The user must
// check using LayerTexture::isDirty() immediately before using it, every time.
// The only way to prevent eviction this is to call LayerTexture::protect().
// If the texture isDirty(), you must updateContents() before you can use it.
class LayerTexture : public RefCounted<LayerTexture> {
public:
static PassRefPtr<LayerTexture> create(bool isColor = false)
{
return adoptRef(new LayerTexture(isColor));
}
~LayerTexture();
bool isDirty() const { return !m_buffer; }
BlackBerry::Platform::Graphics::Buffer* buffer() const { return m_buffer; }
bool isColor() const { return m_isColor; }
bool isProtected() const { return m_protectionCount > 0; }
void protect() { ++m_protectionCount; }
void unprotect() { --m_protectionCount; }
// This will ensure a buffer is allocated for this texture with the requested backing and size.
bool protect(const IntSize&, BlackBerry::Platform::Graphics::BufferType = BlackBerry::Platform::Graphics::BackedWhenNecessary);
Platform3DObject platformTexture() const;
void updateContents(BlackBerry::Platform::Graphics::Buffer*);
void setContentsToColor(const Color&);
IntSize size() const { return m_size; }
int width() const { return m_size.width(); }
int height() const { return m_size.height(); }
static int bytesPerPixel() { return 4; }
size_t sizeInBytes() const { return m_bufferSizeInBytes; }
private:
friend class TextureCacheCompositingThread;
LayerTexture(bool isColor = false);
void setBuffer(BlackBerry::Platform::Graphics::Buffer* buffer)
{
m_buffer = buffer;
// We assume it is a newly allocated buffer,
// and thus empty, or 0, which would of course
// be empty.
m_size = IntSize();
m_bufferSizeInBytes = 0;
}
void setSize(const IntSize& size) { m_size = size; }
int m_protectionCount;
BlackBerry::Platform::Graphics::Buffer* m_buffer;
IntSize m_size;
bool m_isColor;
size_t m_bufferSizeInBytes;
};
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // LayerTexture_h
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