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/*
* Copyright (C) 2011, 2012 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 Texture_h
#define Texture_h
#if USE(ACCELERATED_COMPOSITING)
#include "IntSize.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
class SkBitmap;
namespace WebCore {
class Color;
class IntRect;
class TextureCacheCompositingThread;
// Texture encapsulates a volatile texture - at any time, the underlying OpenGL
// texture may be deleted by the TextureCacheCompositingThread. The user must
// check using Texture::isDirty() immediately before using it, every time.
// The only way to prevent eviction this is to call Texture::protect().
// If the texture isDirty(), you must updateContents() before you can use it.
class Texture : public RefCounted<Texture> {
public:
static PassRefPtr<Texture> create(bool isColor = false)
{
return adoptRef(new Texture(isColor));
}
~Texture();
unsigned textureId() const { return m_textureId; }
bool isDirty() const { return !m_textureId; }
bool hasTexture() const { return m_textureId; }
bool isColor() const { return m_isColor; }
bool isOpaque() const { return m_isOpaque; }
bool isProtected() const { return m_protectionCount > 0; }
void protect() { ++m_protectionCount; }
void unprotect() { --m_protectionCount; }
bool protect(const IntSize&);
void updateContents(const SkBitmap& contents, const IntRect& dirtyRect, const IntRect& tile, bool isOpaque);
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; }
private:
friend class TextureCacheCompositingThread;
Texture(bool isColor = false);
void setTextureId(unsigned id)
{
m_textureId = id;
// We assume it is a newly allocated texture,
// and thus empty, or 0, which would of course
// be empty.
m_size = IntSize();
}
int m_protectionCount;
unsigned m_textureId;
IntSize m_size;
bool m_isColor;
bool m_isOpaque;
};
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
#endif // Texture_h
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