Source/WebCore/page/scrolling/coordinatedgraphics/ScrollingCoordinatorCoordinatedGraphics.cpp

/*
 * Copyright (C) 2013 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 THE COPYRIGHT HOLDERS ``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 HOLDERS 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"

#if USE(COORDINATED_GRAPHICS)

#include "ScrollingCoordinatorCoordinatedGraphics.h"

#include "CoordinatedGraphicsLayer.h"
#include "Page.h"
#include "Settings.h"

namespace WebCore {

ScrollingCoordinatorCoordinatedGraphics::ScrollingCoordinatorCoordinatedGraphics(Page* page)
    : ScrollingCoordinator(page)
{
}

void ScrollingCoordinatorCoordinatedGraphics::setLayerIsFixedToContainerLayer(GraphicsLayer* layer, bool enable)
{
    if (!m_page->settings()->acceleratedCompositingForFixedPositionEnabled())
        return;
    toCoordinatedGraphicsLayer(layer)->setFixedToViewport(enable);
}

void ScrollingCoordinatorCoordinatedGraphics::scrollableAreaScrollLayerDidChange(ScrollableArea* scrollableArea)
{
    CoordinatedGraphicsLayer* layer = toCoordinatedGraphicsLayer(scrollLayerForScrollableArea(scrollableArea));
    if (!layer)
        return;

    layer->setScrollableArea(scrollableArea);
}

void ScrollingCoordinatorCoordinatedGraphics::willDestroyScrollableArea(ScrollableArea* scrollableArea)
{
    CoordinatedGraphicsLayer* layer = toCoordinatedGraphicsLayer(scrollLayerForScrollableArea(scrollableArea));
    if (!layer)
        return;

    layer->setScrollableArea(0);
}

} // namespace WebCore

#endif // USE(COORDINATED_GRAPHICS)