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/*
* Copyright (C) 2011-2019 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.
*/
#pragma once
#if !PLATFORM(WPE)
#include <WebCore/IntSize.h>
#include <WebCore/PlatformImage.h>
#include <pal/HysteresisActivity.h>
#include <wtf/Noncopyable.h>
#include <wtf/TZoneMallocInlines.h>
#if USE(CAIRO) || PLATFORM(GTK)
#include <WebCore/RefPtrCairo.h>
#elif USE(SKIA)
class SkCanvas;
IGNORE_CLANG_WARNINGS_BEGIN("cast-align")
#include <skia/core/SkSurface.h>
IGNORE_CLANG_WARNINGS_END
#endif
namespace WebCore {
class IntRect;
}
namespace WebKit {
struct UpdateInfo;
#if USE(CAIRO) || PLATFORM(GTK)
typedef struct _cairo cairo_t;
using PlatformPaintContextPtr = cairo_t*;
#elif USE(SKIA)
using PlatformPaintContextPtr = SkCanvas*;
#endif
class BackingStore {
WTF_MAKE_TZONE_ALLOCATED_INLINE(BackingStore);
WTF_MAKE_NONCOPYABLE(BackingStore);
public:
BackingStore(const WebCore::IntSize&, float deviceScaleFactor);
~BackingStore();
const WebCore::IntSize& size() const { return m_size; }
float deviceScaleFactor() const { return m_deviceScaleFactor; }
void paint(PlatformPaintContextPtr, const WebCore::IntRect&);
void incorporateUpdate(UpdateInfo&&);
private:
void scroll(const WebCore::IntRect&, const WebCore::IntSize&);
WebCore::IntSize m_size;
float m_deviceScaleFactor { 1 };
#if PLATFORM(GTK) || USE(CAIRO)
RefPtr<cairo_surface_t> m_surface;
RefPtr<cairo_surface_t> m_scrollSurface;
PAL::HysteresisActivity m_scrolledHysteresis;
#elif USE(SKIA)
sk_sp<SkSurface> m_surface;
#endif
};
} // namespace WebKit
#endif // !PLATFORM(WPE)
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