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 35using namespace WebCore; 36 37namespace WebKit { 38 39class BitmapDC { 40 WTF_MAKE_NONCOPYABLE(BitmapDC); 41 42public: 43 BitmapDC(HBITMAP, HDC destinationDC); 44 ~BitmapDC(); 45 46 operator HDC() const { return m_dc.get(); } 47 48private: 49 OwnPtr<HDC> m_dc; 50 HBITMAP m_originalBitmap; 51}; 52 53BitmapDC::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 59BitmapDC::~BitmapDC() 60{ 61 ::SelectObject(m_dc.get(), m_originalBitmap); 62} 63 64void 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 70static 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 78void 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 100void 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