/*

 * 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.

 */

#include "ChunkedUpdateDrawingAreaProxy.h"

#include "DrawingAreaMessageKinds.h"

#include "DrawingAreaProxyMessageKinds.h"

#include "MessageID.h"

#include "UpdateChunk.h"

#include "WebCoreArgumentCoders.h"

#include "WebPageProxy.h"

#include "WebProcessProxy.h"

using namespace WebCore;

namespace WebKit {

ChunkedUpdateDrawingAreaProxy::ChunkedUpdateDrawingAreaProxy(PlatformWebView* webView)

    : DrawingAreaProxy(ChunkedUpdateDrawingAreaType)

    , m_isWaitingForDidSetFrameNotification(false)

    , m_isVisible(true)

    , m_forceRepaintWhenResumingPainting(false)

    , m_webView(webView)

{

}

ChunkedUpdateDrawingAreaProxy::~ChunkedUpdateDrawingAreaProxy()

{

}

void ChunkedUpdateDrawingAreaProxy::paint(const IntRect& rect, PlatformDrawingContext context)

{

    if (m_isWaitingForDidSetFrameNotification) {

        WebPageProxy* page = this->page();

        if (!page->isValid())

            return;

        if (page->process()->isLaunching())

            return;

        OwnPtr<CoreIPC::ArgumentDecoder> arguments = page->process()->connection()->waitFor(DrawingAreaProxyMessage::DidSetSize, page->pageID(), 0.04);

        if (arguments)

            didReceiveMessage(page->process()->connection(), CoreIPC::MessageID(DrawingAreaProxyMessage::DidSetSize), *arguments.get());

    }

    platformPaint(rect, context);

}

void ChunkedUpdateDrawingAreaProxy::setSize(const IntSize& viewSize)

{

    WebPageProxy* page = this->page();

    if (!page->isValid())

        return;

    if (viewSize.isEmpty())

        return;

    m_viewSize = viewSize;

    m_lastSetViewSize = viewSize;

    if (m_isWaitingForDidSetFrameNotification)

        return;

    m_isWaitingForDidSetFrameNotification = true;

    page->process()->responsivenessTimer()->start();

    page->process()->send(DrawingAreaMessage::SetSize, page->pageID(), CoreIPC::In(viewSize));

}

void ChunkedUpdateDrawingAreaProxy::setPageIsVisible(bool isVisible)

{

    WebPageProxy* page = this->page();

    if (isVisible == m_isVisible)

        return;

    m_isVisible = isVisible;

    if (!page->isValid())

        return;

    if (!m_isVisible) {

        // Tell the web process that it doesn't need to paint anything for now.

        page->process()->send(DrawingAreaMessage::SuspendPainting, page->pageID(), CoreIPC::In());

        return;

    }

    // The page is now visible, resume painting.

    page->process()->send(DrawingAreaMessage::ResumePainting, page->pageID(), CoreIPC::In(m_forceRepaintWhenResumingPainting));

    m_forceRepaintWhenResumingPainting = false;

}

void ChunkedUpdateDrawingAreaProxy::didSetSize(UpdateChunk* updateChunk)

{

    ASSERT(m_isWaitingForDidSetFrameNotification);

    m_isWaitingForDidSetFrameNotification = false;

    IntSize viewSize = updateChunk->rect().size();

    if (viewSize != m_lastSetViewSize)

        setSize(m_lastSetViewSize);

    invalidateBackingStore();

    if (!updateChunk->isEmpty())

        drawUpdateChunkIntoBackingStore(updateChunk);

    WebPageProxy* page = this->page();

    page->process()->responsivenessTimer()->stop();

}

void ChunkedUpdateDrawingAreaProxy::update(UpdateChunk* updateChunk)

{

    if (!m_isVisible) {

        // We got an update request that must have been sent before we told the web process to suspend painting.

        // Don't paint this into the backing store, because that could leave the backing store in an inconsistent state.

        // Instead, we will just tell the drawing area to repaint everything when we resume painting.

        m_forceRepaintWhenResumingPainting = true;

    } else {

        // Just paint into backing store.

        drawUpdateChunkIntoBackingStore(updateChunk);

    }

    WebPageProxy* page = this->page();

    page->process()->send(DrawingAreaMessage::DidUpdate, page->pageID(), CoreIPC::In());

}

void ChunkedUpdateDrawingAreaProxy::didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID messageID, CoreIPC::ArgumentDecoder& arguments)

{

    switch (messageID.get<DrawingAreaProxyMessage::Kind>()) {

        case DrawingAreaProxyMessage::Update: {

            UpdateChunk updateChunk;

            if (!arguments.decode(updateChunk))

                return;

            update(&updateChunk);

            break;

        }

        case DrawingAreaProxyMessage::DidSetSize: {

            UpdateChunk updateChunk;

            if (!arguments.decode(CoreIPC::Out(updateChunk)))

                return;

            didSetSize(&updateChunk);

            break;

        }

        default:

            ASSERT_NOT_REACHED();

    }

}

void ChunkedUpdateDrawingAreaProxy::didReceiveSyncMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder&, CoreIPC::ArgumentEncoder&)

{

    ASSERT_NOT_REACHED();

}

} // namespace WebKit