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      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 "config.h"
     27 #include "ChunkedUpdateDrawingAreaProxy.h"
     28 
     29 #include "UpdateChunk.h"
     30 #include "WebProcessProxy.h"
     31 #include "WebView.h"
     32 #include <WebCore/BitmapInfo.h>
     33 
     34 using namespace WebCore;
     35 
     36 namespace WebKit {
     37 
     38 WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
     39 {
     40     return m_webView->page();
     41 }
     42 
     43 void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
     44 {
     45     if (m_backingStoreBitmap)
     46         return;
     47 
     48     BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(size());
     49 
     50     void* pixels = 0;
     51     m_backingStoreBitmap.set(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0));
     52 
     53     if (!m_backingStoreDC) {
     54         // Create a DC for the backing store.
     55         HDC screenDC = ::GetDC(0);
     56         m_backingStoreDC.set(::CreateCompatibleDC(screenDC));
     57         ::ReleaseDC(0, screenDC);
     58     }
     59 
     60     ::SelectObject(m_backingStoreDC.get(), m_backingStoreBitmap.get());
     61 }
     62 
     63 void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
     64 {
     65     m_backingStoreBitmap.clear();
     66 }
     67 
     68 bool ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, HDC hdc)
     69 {
     70     if (!m_backingStoreBitmap)
     71         return false;
     72 
     73     // BitBlt from the backing-store to the passed in hdc.
     74     ::BitBlt(hdc, rect.x(), rect.y(), rect.width(), rect.height(), m_backingStoreDC.get(), rect.x(), rect.y(), SRCCOPY);
     75     return true;
     76 }
     77 
     78 void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
     79 {
     80     ensureBackingStore();
     81 
     82     OwnPtr<HDC> updateChunkBitmapDC(::CreateCompatibleDC(m_backingStoreDC.get()));
     83 
     84     // Create a bitmap.
     85     BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(updateChunk->rect().size());
     86 
     87     // Duplicate the update chunk handle.
     88     HANDLE updateChunkHandle;
     89     BOOL result = ::DuplicateHandle(m_webView->page()->process()->processIdentifier(), updateChunk->memory(),
     90                                     ::GetCurrentProcess(), &updateChunkHandle, STANDARD_RIGHTS_REQUIRED | FILE_MAP_READ | FILE_MAP_WRITE, false, DUPLICATE_CLOSE_SOURCE);
     91 
     92     void* pixels = 0;
     93     OwnPtr<HBITMAP> hBitmap(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, updateChunkHandle, 0));
     94     ::SelectObject(updateChunkBitmapDC.get(), hBitmap.get());
     95 
     96     // BitBlt from the UpdateChunk to the backing store.
     97     ::BitBlt(m_backingStoreDC.get(), updateChunk->rect().x(), updateChunk->rect().y(), updateChunk->rect().width(), updateChunk->rect().height(), updateChunkBitmapDC.get(), 0, 0, SRCCOPY);
     98 
     99     // FIXME: We should not do this here.
    100     ::CloseHandle(updateChunkHandle);
    101 
    102     // Invalidate the WebView's HWND.
    103     RECT rect = updateChunk->rect();
    104     ::InvalidateRect(m_webView->window(), &rect, false);
    105 }
    106 
    107 } // namespace WebKit
    108