/*

 * 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

 *    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.

 */

#if USE(ACCELERATED_COMPOSITING)

#include "LayerBackedDrawingArea.h"

#include "DrawingAreaProxyMessageKinds.h"

#include "WebKitSystemInterface.h"

#include "WebPage.h"

#include "WebProcess.h"

#include <WebCore/Frame.h>

#include <WebCore/FrameView.h>

#include <WebCore/GraphicsLayer.h>

#include <WebCore/Page.h>

using namespace WebCore;

namespace WebKit {

void LayerBackedDrawingArea::platformInit()

{

#if HAVE(HOSTED_CORE_ANIMATION)

    attachCompositingContext();

#endif

    setUpUpdateLayoutRunLoopObserver();

}

void LayerBackedDrawingArea::platformClear()

{

    if (m_updateLayoutRunLoopObserver) {

        CFRunLoopObserverInvalidate(m_updateLayoutRunLoopObserver.get());

        m_updateLayoutRunLoopObserver = 0;

    }

#if HAVE(HOSTED_CORE_ANIMATION)

    WKCARemoteLayerClientInvalidate(m_remoteLayerRef.get());

    m_remoteLayerRef = 0;

#endif

}

void LayerBackedDrawingArea::attachCompositingContext()

{

    if (m_attached)

        return;

    m_backingLayer->syncCompositingStateForThisLayerOnly();

    m_attached = true;

#if HAVE(HOSTED_CORE_ANIMATION)

    mach_port_t serverPort = WebProcess::shared().compositingRenderServerPort();

    m_remoteLayerRef = WKCARemoteLayerClientMakeWithServerPort(serverPort);

    WKCARemoteLayerClientSetLayer(m_remoteLayerRef.get(), m_backingLayer->platformLayer());

    uint32_t contextID = WKCARemoteLayerClientGetClientId(m_remoteLayerRef.get());

    WebProcess::shared().connection()->sendSync(DrawingAreaProxyMessage::AttachCompositingContext, m_webPage->pageID(), CoreIPC::In(contextID), CoreIPC::Out(), CoreIPC::Connection::NoTimeout);

#endif

}

void LayerBackedDrawingArea::detachCompositingContext()

{

    m_backingLayer->removeAllChildren();

    m_backingLayer->syncCompositingStateForThisLayerOnly();

}

void LayerBackedDrawingArea::setRootCompositingLayer(WebCore::GraphicsLayer* layer)

{

    m_backingLayer->removeAllChildren();

    if (layer)

        m_backingLayer->addChild(layer);

    m_backingLayer->syncCompositingStateForThisLayerOnly();

}

void LayerBackedDrawingArea::scheduleCompositingLayerSync()

{

//    if (m_syncTimer.isActive())

//        return;

//

//    m_syncTimer.startOneShot(0);

    scheduleUpdateLayoutRunLoopObserver();

}

void LayerBackedDrawingArea::syncCompositingLayers()

{

    bool didSync = m_webPage->corePage()->mainFrame()->view()->syncCompositingStateRecursive();

    if (!didSync) {

    }

}

void LayerBackedDrawingArea::setUpUpdateLayoutRunLoopObserver()

{

    if (m_updateLayoutRunLoopObserver)

        return;

    // Run before Core Animations commit observer, which has order 2000000.

    const CFIndex runLoopOrder = 2000000 - 1;

    CFRunLoopObserverContext context = { 0, this, 0, 0, 0 };

    m_updateLayoutRunLoopObserver.adoptCF(CFRunLoopObserverCreate(0,

        kCFRunLoopBeforeWaiting | kCFRunLoopExit, true /* repeats */,

        runLoopOrder, updateLayoutRunLoopObserverCallback, &context));

}

void LayerBackedDrawingArea::scheduleUpdateLayoutRunLoopObserver()

{

    CFRunLoopRef currentRunLoop = CFRunLoopGetCurrent();

    if (CFRunLoopContainsObserver(currentRunLoop, m_updateLayoutRunLoopObserver.get(), kCFRunLoopCommonModes))

        return;

    CFRunLoopAddObserver(currentRunLoop, m_updateLayoutRunLoopObserver.get(), kCFRunLoopCommonModes);

}

void LayerBackedDrawingArea::removeUpdateLayoutRunLoopObserver()

{

    // FIXME: cache the run loop ref?

    CFRunLoopRemoveObserver(CFRunLoopGetCurrent(), m_updateLayoutRunLoopObserver.get(), kCFRunLoopCommonModes);

}

void LayerBackedDrawingArea::updateLayoutRunLoopObserverCallback(CFRunLoopObserverRef, CFRunLoopActivity, void* info)

{

    LayerBackedDrawingArea* drawingArea = reinterpret_cast<LayerBackedDrawingArea*>(info);

    drawingArea->updateLayoutRunLoopObserverFired();

}

void LayerBackedDrawingArea::updateLayoutRunLoopObserverFired()

{

    m_webPage->layoutIfNeeded();

    syncCompositingLayers();

}

} // namespace WebKit

#endif // USE(ACCELERATED_COMPOSITING)