1 /* 2 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 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 COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "GraphicsContext.h" 28 29 #if USE(CG) 30 #include "GraphicsContextPlatformPrivateCG.h" 31 #elif USE(CAIRO) 32 #include "GraphicsContextPlatformPrivateCairo.h" 33 #endif 34 35 #include "AffineTransform.h" 36 #include "BitmapInfo.h" 37 #include "TransformationMatrix.h" 38 #include "NotImplemented.h" 39 #include "Path.h" 40 #include <wtf/MathExtras.h> 41 42 using namespace std; 43 44 namespace WebCore { 45 46 static void fillWithClearColor(HBITMAP bitmap) 47 { 48 BITMAP bmpInfo; 49 GetObject(bitmap, sizeof(bmpInfo), &bmpInfo); 50 int bufferSize = bmpInfo.bmWidthBytes * bmpInfo.bmHeight; 51 memset(bmpInfo.bmBits, 0, bufferSize); 52 } 53 54 bool GraphicsContext::inTransparencyLayer() const { return m_data->m_transparencyCount; } 55 56 void GraphicsContext::setShouldIncludeChildWindows(bool include) 57 { 58 m_data->m_shouldIncludeChildWindows = include; 59 } 60 61 bool GraphicsContext::shouldIncludeChildWindows() const 62 { 63 return m_data->m_shouldIncludeChildWindows; 64 } 65 66 GraphicsContext::WindowsBitmap::WindowsBitmap(HDC hdc, IntSize size) 67 : m_hdc(0) 68 { 69 BitmapInfo bitmapInfo = BitmapInfo::create(size); 70 71 void* storage = 0; 72 m_bitmap = CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &storage, 0, 0); 73 if (!m_bitmap) 74 return; 75 76 m_hdc = CreateCompatibleDC(hdc); 77 SelectObject(m_hdc, m_bitmap); 78 79 m_pixelData.initialize(m_bitmap); 80 81 ASSERT(storage == m_pixelData.buffer()); 82 83 SetGraphicsMode(m_hdc, GM_ADVANCED); 84 } 85 86 GraphicsContext::WindowsBitmap::~WindowsBitmap() 87 { 88 if (!m_bitmap) 89 return; 90 91 DeleteDC(m_hdc); 92 DeleteObject(m_bitmap); 93 } 94 95 GraphicsContext::WindowsBitmap* GraphicsContext::createWindowsBitmap(IntSize size) 96 { 97 return new WindowsBitmap(m_data->m_hdc, size); 98 } 99 100 HDC GraphicsContext::getWindowsContext(const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap) 101 { 102 // FIXME: Should a bitmap be created also when a shadow is set? 103 if (mayCreateBitmap && (!m_data->m_hdc || inTransparencyLayer())) { 104 if (dstRect.isEmpty()) 105 return 0; 106 107 // Create a bitmap DC in which to draw. 108 BitmapInfo bitmapInfo = BitmapInfo::create(dstRect.size()); 109 110 void* pixels = 0; 111 HBITMAP bitmap = ::CreateDIBSection(NULL, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0); 112 if (!bitmap) 113 return 0; 114 115 HDC bitmapDC = ::CreateCompatibleDC(m_data->m_hdc); 116 ::SelectObject(bitmapDC, bitmap); 117 118 // Fill our buffer with clear if we're going to alpha blend. 119 if (supportAlphaBlend) 120 fillWithClearColor(bitmap); 121 122 // Make sure we can do world transforms. 123 SetGraphicsMode(bitmapDC, GM_ADVANCED); 124 125 // Apply a translation to our context so that the drawing done will be at (0,0) of the bitmap. 126 XFORM xform = TransformationMatrix().translate(-dstRect.x(), -dstRect.y()); 127 128 ::SetWorldTransform(bitmapDC, &xform); 129 130 return bitmapDC; 131 } 132 133 m_data->flush(); 134 m_data->save(); 135 return m_data->m_hdc; 136 } 137 138 void GraphicsContextPlatformPrivate::save() 139 { 140 if (!m_hdc) 141 return; 142 SaveDC(m_hdc); 143 } 144 145 void GraphicsContextPlatformPrivate::restore() 146 { 147 if (!m_hdc) 148 return; 149 RestoreDC(m_hdc, -1); 150 } 151 152 void GraphicsContextPlatformPrivate::clip(const FloatRect& clipRect) 153 { 154 if (!m_hdc) 155 return; 156 IntersectClipRect(m_hdc, clipRect.x(), clipRect.y(), clipRect.maxX(), clipRect.maxY()); 157 } 158 159 void GraphicsContextPlatformPrivate::clip(const Path&) 160 { 161 notImplemented(); 162 } 163 164 void GraphicsContextPlatformPrivate::scale(const FloatSize& size) 165 { 166 if (!m_hdc) 167 return; 168 169 XFORM xform = TransformationMatrix().scaleNonUniform(size.width(), size.height()); 170 ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY); 171 } 172 173 static const double deg2rad = 0.017453292519943295769; // pi/180 174 175 void GraphicsContextPlatformPrivate::rotate(float degreesAngle) 176 { 177 XFORM xform = TransformationMatrix().rotate(degreesAngle); 178 ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY); 179 } 180 181 void GraphicsContextPlatformPrivate::translate(float x , float y) 182 { 183 if (!m_hdc) 184 return; 185 186 XFORM xform = TransformationMatrix().translate(x, y); 187 ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY); 188 } 189 190 void GraphicsContextPlatformPrivate::concatCTM(const AffineTransform& transform) 191 { 192 if (!m_hdc) 193 return; 194 195 XFORM xform = transform.toTransformationMatrix(); 196 ModifyWorldTransform(m_hdc, &xform, MWT_LEFTMULTIPLY); 197 } 198 199 void GraphicsContextPlatformPrivate::setCTM(const AffineTransform& transform) 200 { 201 if (!m_hdc) 202 return; 203 204 XFORM xform = transform.toTransformationMatrix(); 205 SetWorldTransform(m_hdc, &xform); 206 } 207 208 } 209
