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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 APPLE INC. AND ITS CONTRIBUTORS ``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 APPLE INC. OR ITS 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 BackingStore_h
#define BackingStore_h
#include <WebCore/IntRect.h>
#include <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.h>
#if PLATFORM(MAC)
#include <wtf/RetainPtr.h>
#endif
#if PLATFORM(QT)
#include <QtGui/QPainter>
#include <QtGui/QPixmap>
#endif
#if USE(CAIRO)
#include <RefPtrCairo.h>
#include <WebCore/WidgetBackingStore.h>
#endif
namespace WebKit {
class ShareableBitmap;
class UpdateInfo;
class WebPageProxy;
class BackingStore {
WTF_MAKE_NONCOPYABLE(BackingStore);
public:
static PassOwnPtr<BackingStore> create(const WebCore::IntSize&, float deviceScaleFactor, WebPageProxy*);
~BackingStore();
const WebCore::IntSize& size() const { return m_size; }
float deviceScaleFactor() const { return m_deviceScaleFactor; }
#if PLATFORM(MAC)
typedef CGContextRef PlatformGraphicsContext;
#elif PLATFORM(QT)
typedef QPainter* PlatformGraphicsContext;
#elif USE(CAIRO)
typedef cairo_t* PlatformGraphicsContext;
#endif
void paint(PlatformGraphicsContext, const WebCore::IntRect&);
void incorporateUpdate(const UpdateInfo&);
private:
BackingStore(const WebCore::IntSize&, float deviceScaleFactor, WebPageProxy*);
void incorporateUpdate(ShareableBitmap*, const UpdateInfo&);
void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
WebCore::IntSize m_size;
float m_deviceScaleFactor;
WebPageProxy* m_webPageProxy;
#if PLATFORM(MAC)
CGContextRef backingStoreContext();
void performWithScrolledRectTransform(const WebCore::IntRect&, void (^)(const WebCore::IntRect&, const WebCore::IntSize&));
void resetScrolledRect();
RetainPtr<CGLayerRef> m_cgLayer;
RetainPtr<CGContextRef> m_bitmapContext;
// The rectange that was scrolled most recently.
WebCore::IntRect m_scrolledRect;
// Contents of m_scrolledRect are offset by this amount (and wrapped around) with respect to
// their original location.
WebCore::IntSize m_scrolledRectOffset;
#elif PLATFORM(QT)
QPixmap m_pixmap;
#elif USE(CAIRO)
OwnPtr<WebCore::WidgetBackingStore> m_backingStore;
#endif
};
} // namespace WebKit
#endif // BackingStore_h
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