1 /*

     2  * Copyright (C) 2010 Apple Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''

    14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

    15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS

    17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

    23  * THE POSSIBILITY OF SUCH DAMAGE.

    24  */

    25 

    26 #include "ChunkedUpdateDrawingAreaProxy.h"

    27 

    28 #include "UpdateChunk.h"

    29 #include "WebProcessProxy.h"

    30 #include "WebView.h"

    31 #include <WebCore/BitmapInfo.h>

    32 

    33 using namespace WebCore;

    34 

    35 namespace WebKit {

    36 

    37 WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()

    38 {

    39     return m_webView->page();

    40 }

    41 

    42 void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()

    43 {

    44     if (m_backingStoreBitmap)

    45         return;

    46 

    47     BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(m_viewSize);

    48 

    49     void* pixels = 0;

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

    51 

    52     if (!m_backingStoreDC) {

    53         // Create a DC for the backing store.

    54         HDC screenDC = ::GetDC(0);

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

    56         ::ReleaseDC(0, screenDC);

    57     }

    58 

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

    60 }

    61 

    62 void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()

    63 {

    64     m_backingStoreBitmap.clear();

    65 }

    66 

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

    68 {

    69     if (!m_backingStoreBitmap)

    70         return;

    71 

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

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

    74 }

    75 

    76 void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)

    77 {

    78     ensureBackingStore();

    79 

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

    81 

    82     // Create a bitmap.

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

    84 

    85     // Duplicate the update chunk handle.

    86     HANDLE updateChunkHandle;

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

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

    89 

    90     void* pixels = 0;

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

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

    93 

    94     // BitBlt from the UpdateChunk to the backing store.

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

    96 

    97     // FIXME: We should not do this here.

    98     ::CloseHandle(updateChunkHandle);

    99 

   100     // Invalidate the WebView's HWND.

   101     RECT rect = updateChunk->rect();

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

   103 }

   104 

   105 } // namespace WebKit