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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 "TransparencyLayerContextSwitcher.h"
#include "Filter.h"
#include "GraphicsContext.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(TransparencyLayerContextSwitcher);
TransparencyLayerContextSwitcher::TransparencyLayerContextSwitcher(GraphicsContext& destinationContext, const FloatRect& sourceImageRect, RefPtr<Filter>&& filter)
: GraphicsContextSwitcher(WTFMove(filter))
{
if (m_filter)
m_filterStyles = m_filter->createFilterStyles(destinationContext, sourceImageRect);
}
void TransparencyLayerContextSwitcher::beginClipAndDrawSourceImage(GraphicsContext& destinationContext, const FloatRect&, const FloatRect& clipRect)
{
destinationContext.save();
destinationContext.beginTransparencyLayer(1);
for (auto& filterStyle : m_filterStyles) {
destinationContext.save();
destinationContext.clip(intersection(filterStyle.imageRect, clipRect));
destinationContext.setStyle(filterStyle.style);
destinationContext.beginTransparencyLayer(1);
}
}
void TransparencyLayerContextSwitcher::beginDrawSourceImage(GraphicsContext& destinationContext, float opacity)
{
destinationContext.save();
destinationContext.beginTransparencyLayer(opacity);
for (auto& filterStyle : m_filterStyles) {
destinationContext.save();
destinationContext.clip(filterStyle.imageRect);
destinationContext.setStyle(filterStyle.style);
destinationContext.beginTransparencyLayer(1);
}
}
void TransparencyLayerContextSwitcher::endDrawSourceImage(GraphicsContext& destinationContext, const DestinationColorSpace&)
{
for ([[maybe_unused]] auto& filterStyle : makeReversedRange(m_filterStyles)) {
destinationContext.endTransparencyLayer();
destinationContext.restore();
}
destinationContext.endTransparencyLayer();
destinationContext.restore();
}
} // namespace WebCore
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