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/*
* Copyright (C) 2022 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. ``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
* 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 "ImageBufferContextSwitcher.h"
#include "Filter.h"
#include "FilterResults.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(ImageBufferContextSwitcher);
ImageBufferContextSwitcher::ImageBufferContextSwitcher(GraphicsContext& destinationContext, const FloatRect& sourceImageRect, const DestinationColorSpace& colorSpace, RefPtr<Filter>&& filter, FilterResults* results)
: GraphicsContextSwitcher(WTFMove(filter))
, m_sourceImageRect(sourceImageRect)
, m_results(results)
{
if (sourceImageRect.isEmpty())
return;
if (m_filter)
m_sourceImage = destinationContext.createScaledImageBuffer(m_sourceImageRect, m_filter->filterScale(), colorSpace, m_filter->renderingMode());
else
m_sourceImage = destinationContext.createAlignedImageBuffer(m_sourceImageRect, colorSpace);
if (!m_sourceImage) {
m_filter = nullptr;
return;
}
auto state = destinationContext.state();
m_sourceImage->context().mergeAllChanges(state);
}
GraphicsContext* ImageBufferContextSwitcher::drawingContext(GraphicsContext& context) const
{
return m_sourceImage ? &m_sourceImage->context() : &context;
}
void ImageBufferContextSwitcher::beginClipAndDrawSourceImage(GraphicsContext& destinationContext, const FloatRect& repaintRect, const FloatRect&)
{
if (auto* context = drawingContext(destinationContext)) {
context->save();
context->clearRect(repaintRect);
context->clip(repaintRect);
}
}
void ImageBufferContextSwitcher::endClipAndDrawSourceImage(GraphicsContext& destinationContext, const DestinationColorSpace& colorSpace)
{
if (auto* context = drawingContext(destinationContext))
context->restore();
endDrawSourceImage(destinationContext, colorSpace);
}
void ImageBufferContextSwitcher::endDrawSourceImage(GraphicsContext& destinationContext, const DestinationColorSpace& colorSpace)
{
if (!m_filter) {
if (m_sourceImage)
destinationContext.drawImageBuffer(*m_sourceImage, m_sourceImageRect, { destinationContext.compositeOperation(), destinationContext.blendMode() });
return;
}
FilterResults results;
#if USE(CAIRO)
// Cairo operates in SRGB which is why the SourceImage initially is in SRGB color space,
// but before applying all filters it has to be transformed to LinearRGB to comply with
// specification (https://www.w3.org/TR/filter-effects-1/#attr-valuedef-in-sourcegraphic).
if (m_sourceImage)
m_sourceImage->transformToColorSpace(colorSpace);
#else
UNUSED_PARAM(colorSpace);
#endif
destinationContext.drawFilteredImageBuffer(m_sourceImage.get(), m_sourceImageRect, Ref { *m_filter }, m_results ? *m_results : results);
}
} // namespace WebCore
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