Source/WebKit2/WebProcess/WebPage/qt/TiledDrawingAreaQt.cpp

/*
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 *
 * 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 "TiledDrawingArea.h"

#if ENABLE(TILED_BACKING_STORE)

#include "UpdateChunk.h"
#include "WebPage.h"
#include <WebCore/GraphicsContext.h>

#include <QImage>
#include <QPainter>

using namespace WebCore;

namespace WebKit {

void TiledDrawingArea::paintIntoUpdateChunk(UpdateChunk* updateChunk, float scale)
{
    IntRect tileRect = updateChunk->rect();
    QImage image(updateChunk->createImage());
    QPainter painter(&image);
    // Now paint into the backing store.
    GraphicsContext graphicsContext(&painter);
    graphicsContext.translate(-tileRect.x(), -tileRect.y());
    graphicsContext.scale(FloatSize(scale, scale));
    IntRect contentRect = enclosingIntRect(FloatRect(tileRect.x() / scale,
                                                     tileRect.y() / scale,
                                                     tileRect.width() / scale,
                                                     tileRect.height() / scale));
    m_webPage->drawRect(graphicsContext, contentRect);
}

} // namespace WebKit

#endif // TILED_BACKING_STORE