Source/WebCore/platform/graphics/nicosia/NicosiaPaintingEngineBasic.cpp

/*
 * Copyright (C) 2017 Metrological Group B.V.
 * Copyright (C) 2017 Igalia S.L.
 *
 * 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * HOLDER 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 "NicosiaPaintingEngineBasic.h"

#include "GraphicsContext.h"
#include "GraphicsLayer.h"
#include "NicosiaBuffer.h"
#include "NicosiaPaintingContext.h"

namespace Nicosia {

using namespace WebCore;

PaintingEngineBasic::PaintingEngineBasic() = default;
PaintingEngineBasic::~PaintingEngineBasic() = default;

bool PaintingEngineBasic::paint(GraphicsLayer& layer, Ref<Buffer>&& buffer, const IntRect& sourceRect, const IntRect& mappedSourceRect, const IntRect& targetRect, float contentsScale)
{
    buffer->beginPainting();

    bool supportsAlpha = buffer->supportsAlpha();
    PaintingContext::paint(buffer,
        [&layer, sourceRect, mappedSourceRect, targetRect, contentsScale, supportsAlpha]
        (GraphicsContext& context)
        {
            context.save();
            context.clip(targetRect);
            context.translate(targetRect.x(), targetRect.y());

            if (supportsAlpha) {
                context.setCompositeOperation(CompositeOperator::Copy);
                context.fillRect(IntRect(IntPoint::zero(), sourceRect.size()), Color::transparentBlack);
                context.setCompositeOperation(CompositeOperator::SourceOver);
            }

            context.translate(-sourceRect.x(), -sourceRect.y());
            context.scale(FloatSize(contentsScale, contentsScale));

            layer.paintGraphicsLayerContents(context, mappedSourceRect);

            context.restore();
        });

    buffer->completePainting();

    return true;
}

} // namespace Nicosia