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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     15  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     16  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     21  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     22  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     23  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     24  * THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "ChunkedUpdateDrawingAreaProxy.h"
     29 
     30 #include "DrawingAreaMessageKinds.h"
     31 #include "DrawingAreaProxyMessageKinds.h"
     32 #include "UpdateChunk.h"
     33 #include "WKAPICast.h"
     34 #include "WebPageProxy.h"
     35 #include "qgraphicswkview.h"
     36 #include <QPainter>
     37 
     38 using namespace WebCore;
     39 
     40 namespace WebKit {
     41 
     42 WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
     43 {
     44     return toImpl(m_webView->page()->pageRef());
     45 }
     46 
     47 void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
     48 {
     49     if (!m_backingStoreImage.isNull())
     50         return;
     51 
     52     m_backingStoreImage = QImage(size().width(), size().height(), QImage::Format_RGB32);
     53 }
     54 
     55 void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
     56 {
     57     m_backingStoreImage = QImage();
     58 }
     59 
     60 bool ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, QPainter* painter)
     61 {
     62     if (m_backingStoreImage.isNull())
     63         return false;
     64 
     65     painter->drawImage(QPoint(0, 0), m_backingStoreImage);
     66     return true;
     67 }
     68 
     69 void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
     70 {
     71     ensureBackingStore();
     72 
     73     QImage image(updateChunk->createImage());
     74     const IntRect& updateChunkRect = updateChunk->rect();
     75 
     76     QPainter painter(&m_backingStoreImage);
     77     painter.drawImage(updateChunkRect.location(), image);
     78 
     79     m_webView->update(QRect(updateChunkRect));
     80 }
     81 
     82 } // namespace WebKit
     83