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/*
* Copyright (C) 2024 Sony Interactive Entertainment Inc.
*
* 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.
*/
#include "config.h"
#include "BackingStore.h"
#if USE(SKIA)
#include "UpdateInfo.h"
#include <WebCore/GraphicsContextSkia.h>
#include <skia/core/SkBitmap.h>
#include <skia/core/SkCanvas.h>
namespace WebKit {
BackingStore::BackingStore(const WebCore::IntSize& size, float deviceScaleFactor)
: m_size(size)
, m_deviceScaleFactor(deviceScaleFactor)
{
WebCore::IntSize scaledSize(size);
scaledSize.scale(deviceScaleFactor);
auto info = SkImageInfo::MakeN32Premul(scaledSize.width(), scaledSize.height(), SkColorSpace::MakeSRGB());
m_surface = SkSurfaces::Raster(info);
RELEASE_ASSERT(m_surface);
}
BackingStore::~BackingStore() = default;
void BackingStore::paint(PlatformPaintContextPtr cr, const WebCore::IntRect& rect)
{
cr->save();
cr->scale(1 / m_deviceScaleFactor, 1 / m_deviceScaleFactor);
WebCore::IntRect scaledRect { rect };
scaledRect.scale(m_deviceScaleFactor);
cr->clipIRect(scaledRect);
SkSamplingOptions option { SkFilterMode::kLinear };
m_surface->draw(cr, 0, 0, option, nullptr);
cr->restore();
}
void BackingStore::incorporateUpdate(UpdateInfo&& updateInfo)
{
ASSERT(m_size == updateInfo.viewSize);
if (!updateInfo.bitmapHandle)
return;
auto bitmap = WebCore::ShareableBitmap::create(WTFMove(*updateInfo.bitmapHandle));
if (!bitmap)
return;
#if ASSERT_ENABLED
WebCore::IntSize updateSize = expandedIntSize(updateInfo.updateRectBounds.size() * m_deviceScaleFactor);
ASSERT(bitmap->size() == updateSize);
#endif
scroll(updateInfo.scrollRect, updateInfo.scrollOffset);
// Paint all update rects.
WebCore::IntPoint updateRectLocation = updateInfo.updateRectBounds.location();
SkCanvas* canvas = m_surface->getCanvas();
if (!canvas)
return;
WebCore::GraphicsContextSkia graphicsContext(*canvas, WebCore::RenderingMode::Unaccelerated, WebCore::RenderingPurpose::ShareableLocalSnapshot);
graphicsContext.setCompositeOperation(WebCore::CompositeOperator::Copy);
for (const auto& updateRect : updateInfo.updateRects) {
WebCore::IntRect srcRect = updateRect;
srcRect.move(-updateRectLocation.x(), -updateRectLocation.y());
bitmap->paint(graphicsContext, m_deviceScaleFactor, updateRect.location(), srcRect);
}
}
void BackingStore::scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset)
{
if (scrollOffset.isZero())
return;
WebCore::IntRect targetRect = scrollRect;
targetRect.move(scrollOffset);
targetRect.intersect(scrollRect);
if (targetRect.isEmpty())
return;
WebCore::IntSize scaledScrollOffset = scrollOffset;
targetRect.scale(m_deviceScaleFactor);
scaledScrollOffset.scale(m_deviceScaleFactor, m_deviceScaleFactor);
SkBitmap bitmap;
bitmap.allocPixels(m_surface->imageInfo().makeWH(targetRect.width(), targetRect.height()));
if (!m_surface->readPixels(bitmap, targetRect.x() - scaledScrollOffset.width(), targetRect.y() - scaledScrollOffset.height()))
return;
m_surface->writePixels(bitmap, targetRect.x(), targetRect.y());
}
} // namespace WebKit
#endif // USE(SKIA)
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