/*

 * 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 "UpdateChunk.h"

#include "WebProcessProxy.h"

#include "WebView.h"

#include <WebCore/BitmapInfo.h>

using namespace WebCore;

namespace WebKit {

WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()

{

    return m_webView->page();

}

void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()

{

    if (m_backingStoreBitmap)

        return;

    BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(m_viewSize);

    void* pixels = 0;

    m_backingStoreBitmap.set(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0));

    if (!m_backingStoreDC) {

        // Create a DC for the backing store.

        HDC screenDC = ::GetDC(0);

        m_backingStoreDC.set(::CreateCompatibleDC(screenDC));

        ::ReleaseDC(0, screenDC);

    }

    ::SelectObject(m_backingStoreDC.get(), m_backingStoreBitmap.get());

}

void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()

{

    m_backingStoreBitmap.clear();

}

void ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, HDC hdc)

{

    if (!m_backingStoreBitmap)

        return;

    // BitBlt from the backing-store to the passed in hdc.

    ::BitBlt(hdc, rect.x(), rect.y(), rect.width(), rect.height(), m_backingStoreDC.get(), rect.x(), rect.y(), SRCCOPY);

}

void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)

{

    ensureBackingStore();

    OwnPtr<HDC> updateChunkBitmapDC(::CreateCompatibleDC(m_backingStoreDC.get()));

    // Create a bitmap.

    BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(updateChunk->rect().size());

    // Duplicate the update chunk handle.

    HANDLE updateChunkHandle;

    BOOL result = ::DuplicateHandle(m_webView->page()->process()->processIdentifier(), updateChunk->memory(),

                                    ::GetCurrentProcess(), &updateChunkHandle, STANDARD_RIGHTS_REQUIRED | FILE_MAP_READ | FILE_MAP_WRITE, false, DUPLICATE_CLOSE_SOURCE);

    void* pixels = 0;

    OwnPtr<HBITMAP> hBitmap(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, updateChunkHandle, 0));

    ::SelectObject(updateChunkBitmapDC.get(), hBitmap.get());

    // BitBlt from the UpdateChunk to the backing store.

    ::BitBlt(m_backingStoreDC.get(), updateChunk->rect().x(), updateChunk->rect().y(), updateChunk->rect().width(), updateChunk->rect().height(), updateChunkBitmapDC.get(), 0, 0, SRCCOPY);

    // FIXME: We should not do this here.

    ::CloseHandle(updateChunkHandle);

    // Invalidate the WebView's HWND.

    RECT rect = updateChunk->rect();

    ::InvalidateRect(m_webView->window(), &rect, false);

}

} // namespace WebKit