Source/WebKit2/Shared/qt/ShareableBitmapQt.cpp

/*
 * Copyright (C) 2010 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
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 *    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
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "config.h"
#include "ShareableBitmap.h"

#include "NativeImageQt.h"
#include <QImage>
#include <QPainter>
#include <QtGlobal>
#include <WebCore/BitmapImage.h>
#include <WebCore/GraphicsContext.h>
#include <WebCore/NotImplemented.h>

using namespace WebCore;

namespace WebKit {

QImage ShareableBitmap::createQImage()
{
    ref(); // Balanced by deref in releaseSharedMemoryData
    return QImage(reinterpret_cast<uchar*>(data()), m_size.width(), m_size.height(), m_size.width() * 4,
                  m_flags & SupportsAlpha ? NativeImageQt::defaultFormatForAlphaEnabledImages() : NativeImageQt::defaultFormatForOpaqueImages(),
                  releaseSharedMemoryData, this);
}

void ShareableBitmap::releaseSharedMemoryData(void* typelessBitmap)
{
    static_cast<ShareableBitmap*>(typelessBitmap)->deref(); // Balanced by ref in createQImage.
}

PassRefPtr<Image> ShareableBitmap::createImage()
{
    QPixmap* pixmap = new QPixmap(QPixmap::fromImage(createQImage()));
    return BitmapImage::create(pixmap);
}

PassOwnPtr<GraphicsContext> ShareableBitmap::createGraphicsContext()
{
    // FIXME: Should this be OwnPtr<QImage>?
    QImage* image = new QImage(createQImage());
    QPainter* painter = new QPainter(image);
    painter->setRenderHint(QPainter::SmoothPixmapTransform, true);
    OwnPtr<GraphicsContext> context = adoptPtr(new GraphicsContext(painter));
    context->takeOwnershipOfPlatformContext();
    return context.release();
}

void ShareableBitmap::paint(GraphicsContext& context, const IntPoint& dstPoint, const IntRect& srcRect)
{
    QImage image = createQImage();
    QPainter* painter = context.platformContext();
    painter->drawImage(dstPoint, image, QRect(srcRect));
}

void ShareableBitmap::paint(GraphicsContext& context, float scaleFactor, const IntPoint& dstPoint, const IntRect& srcRect)
{
    if (qFuzzyCompare(scaleFactor, 1)) {
        paint(context, dstPoint, srcRect);
        return;
    }

    QImage image = createQImage();
    QPainter* painter = context.platformContext();

    painter->save();
    painter->scale(scaleFactor, scaleFactor);
    painter->drawImage(dstPoint, image, QRect(srcRect));
    painter->restore();
}

}
// namespace WebKit