/*

 * 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 "UpdateChunk.h"

#include "WKAPICast.h"

#include "WKView.h"

#include "WebPageProxy.h"

using namespace WebCore;

namespace WebKit {

WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()

{

    return toWK([m_webView pageRef]);

}

void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()

{

    if (m_bitmapContext)

        return;

    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());

    m_bitmapContext.adoptCF(CGBitmapContextCreate(0, m_viewSize.width(), m_viewSize.height(), 8, m_viewSize.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));

    // Flip the bitmap context coordinate system.

    CGContextTranslateCTM(m_bitmapContext.get(), 0, m_viewSize.height());

    CGContextScaleCTM(m_bitmapContext.get(), 1, -1);

}

void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()

{

    m_bitmapContext = 0;

}

void ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, CGContextRef context)

{

    if (!m_bitmapContext)

        return;

    RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(m_bitmapContext.get()));

    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image.get()), CGImageGetHeight(image.get())), image.get());

}

void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)

{

    ensureBackingStore();

    RetainPtr<CGImageRef> image(updateChunk->createImage());

    const IntRect& updateChunkRect = updateChunk->rect();

    CGContextDrawImage(m_bitmapContext.get(), CGRectMake(updateChunkRect.x(), m_viewSize.height() - updateChunkRect.bottom(), 

                                                         updateChunkRect.width(), updateChunkRect.height()), image.get());

    [m_webView setNeedsDisplayInRect:NSRectFromCGRect(updateChunkRect)];

}

} // namespace WebKit