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/*
* Copyright (C) 2024 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 "CanvasLayerContextSwitcher.h"
#include "CanvasRenderingContext2DBase.h"
#include "Filter.h"
#include "GraphicsContextSwitcher.h"
namespace WebCore {
RefPtr<CanvasLayerContextSwitcher> CanvasLayerContextSwitcher::create(CanvasRenderingContext2DBase& context, const FloatRect& bounds, RefPtr<Filter>&& filter)
{
ASSERT(!bounds.isEmpty());
auto* effectiveDrawingContext = context.effectiveDrawingContext();
if (!effectiveDrawingContext)
return nullptr;
auto targetSwitcher = GraphicsContextSwitcher::create(*effectiveDrawingContext, bounds, context.colorSpace(), WTFMove(filter));
if (!targetSwitcher)
return nullptr;
return adoptRef(*new CanvasLayerContextSwitcher(context, bounds, WTFMove(targetSwitcher)));
}
CanvasLayerContextSwitcher::CanvasLayerContextSwitcher(CanvasRenderingContext2DBase& context, const FloatRect& bounds, std::unique_ptr<GraphicsContextSwitcher>&& targetSwitcher)
: m_context(context)
, m_effectiveDrawingContext(context.effectiveDrawingContext())
, m_bounds(bounds)
, m_targetSwitcher(WTFMove(targetSwitcher))
{
ASSERT(m_targetSwitcher);
ASSERT(m_effectiveDrawingContext);
m_targetSwitcher->beginDrawSourceImage(*m_effectiveDrawingContext, context.globalAlpha());
}
CanvasLayerContextSwitcher::~CanvasLayerContextSwitcher()
{
m_targetSwitcher->endDrawSourceImage(*m_effectiveDrawingContext, DestinationColorSpace::SRGB());
}
GraphicsContext* CanvasLayerContextSwitcher::drawingContext() const
{
if (!m_effectiveDrawingContext)
return nullptr;
return m_targetSwitcher->drawingContext(*m_effectiveDrawingContext);
}
FloatBoxExtent CanvasLayerContextSwitcher::outsets() const
{
return toFloatBoxExtent(protectedContext()->calculateFilterOutsets(m_bounds));
}
} // namespace WebCore
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