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      1 /*
      2  * Copyright (C) 2011 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 "BackingStore.h"
     28 
     29 #include "ShareableBitmap.h"
     30 #include "UpdateInfo.h"
     31 #include <WebCore/BitmapInfo.h>
     32 #include <WebCore/GraphicsContext.h>
     33 #include <WebCore/IntRect.h>
     34 
     35 using namespace WebCore;
     36 
     37 namespace WebKit {
     38 
     39 class BitmapDC {
     40     WTF_MAKE_NONCOPYABLE(BitmapDC);
     41 
     42 public:
     43     BitmapDC(HBITMAP, HDC destinationDC);
     44     ~BitmapDC();
     45 
     46     operator HDC() const { return m_dc.get(); }
     47 
     48 private:
     49     OwnPtr<HDC> m_dc;
     50     HBITMAP m_originalBitmap;
     51 };
     52 
     53 BitmapDC::BitmapDC(HBITMAP bitmap, HDC destinationDC)
     54     : m_dc(adoptPtr(::CreateCompatibleDC(destinationDC)))
     55     , m_originalBitmap(static_cast<HBITMAP>(::SelectObject(m_dc.get(), bitmap)))
     56 {
     57 }
     58 
     59 BitmapDC::~BitmapDC()
     60 {
     61     ::SelectObject(m_dc.get(), m_originalBitmap);
     62 }
     63 
     64 void BackingStore::paint(HDC dc, const IntRect& rect)
     65 {
     66     ASSERT(m_bitmap);
     67     ::BitBlt(dc, rect.x(), rect.y(), rect.width(), rect.height(), BitmapDC(m_bitmap.get(), dc), rect.x(), rect.y(), SRCCOPY);
     68 }
     69 
     70 static PassOwnPtr<HBITMAP> createBitmap(const IntSize& size)
     71 {
     72     // FIXME: Maybe it would be better for performance to create a device-dependent bitmap here?
     73     BitmapInfo info = BitmapInfo::createBottomUp(size);
     74     void* bits;
     75     return adoptPtr(::CreateDIBSection(0, &info, DIB_RGB_COLORS, &bits, 0, 0));
     76 }
     77 
     78 void BackingStore::incorporateUpdate(ShareableBitmap* bitmap, const UpdateInfo& updateInfo)
     79 {
     80     if (!m_bitmap)
     81         m_bitmap = createBitmap(m_size);
     82 
     83     scroll(updateInfo.scrollRect, updateInfo.scrollOffset);
     84 
     85     IntPoint updateRectLocation = updateInfo.updateRectBounds.location();
     86 
     87     BitmapDC dc(m_bitmap.get(), 0);
     88     GraphicsContext graphicsContext(dc);
     89 
     90     // Paint all update rects.
     91     for (size_t i = 0; i < updateInfo.updateRects.size(); ++i) {
     92         IntRect updateRect = updateInfo.updateRects[i];
     93         IntRect srcRect = updateRect;
     94         srcRect.move(-updateRectLocation.x(), -updateRectLocation.y());
     95 
     96         bitmap->paint(graphicsContext, updateRect.location(), srcRect);
     97     }
     98 }
     99 
    100 void BackingStore::scroll(const IntRect& scrollRect, const IntSize& scrollOffset)
    101 {
    102     if (scrollOffset.isZero())
    103         return;
    104 
    105     RECT winScrollRect = scrollRect;
    106     ::ScrollDC(BitmapDC(m_bitmap.get(), 0), scrollOffset.width(), scrollOffset.height(), &winScrollRect, &winScrollRect, 0, 0);
    107 }
    108 
    109 } // namespace WebKit
    110