1 /* 2 * Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com) 3 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved. 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 COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "config.h" 28 #include "Image.h" 29 30 #include "AffineTransform.h" 31 #include "BitmapImage.h" 32 #include "GraphicsContext.h" 33 #include "IntRect.h" 34 #include "MIMETypeRegistry.h" 35 #include "SharedBuffer.h" 36 #include <math.h> 37 #include <wtf/StdLibExtras.h> 38 39 #if USE(CG) 40 #include <CoreFoundation/CoreFoundation.h> 41 #endif 42 43 namespace WebCore { 44 45 Image::Image(ImageObserver* observer) 46 : m_imageObserver(observer) 47 { 48 } 49 50 Image::~Image() 51 { 52 } 53 54 Image* Image::nullImage() 55 { 56 ASSERT(isMainThread()); 57 DEFINE_STATIC_LOCAL(RefPtr<Image>, nullImage, (BitmapImage::create()));; 58 return nullImage.get(); 59 } 60 61 bool Image::supportsType(const String& type) 62 { 63 return MIMETypeRegistry::isSupportedImageResourceMIMEType(type); 64 } 65 66 bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived) 67 { 68 m_data = data; 69 if (!m_data.get()) 70 return true; 71 72 int length = m_data->size(); 73 if (!length) 74 return true; 75 76 return dataChanged(allDataReceived); 77 } 78 79 void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op) 80 { 81 if (color.alpha() <= 0) 82 return; 83 84 CompositeOperator previousOperator = ctxt->compositeOperation(); 85 ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op); 86 ctxt->fillRect(dstRect, color, styleColorSpace); 87 ctxt->setCompositeOperation(previousOperator); 88 } 89 90 static inline FloatSize calculatePatternScale(const FloatRect& dstRect, const FloatRect& srcRect, Image::TileRule hRule, Image::TileRule vRule) 91 { 92 float scaleX = 1.0f, scaleY = 1.0f; 93 94 if (hRule == Image::StretchTile) 95 scaleX = dstRect.width() / srcRect.width(); 96 if (vRule == Image::StretchTile) 97 scaleY = dstRect.height() / srcRect.height(); 98 99 if (hRule == Image::RepeatTile) 100 scaleX = scaleY; 101 if (vRule == Image::RepeatTile) 102 scaleY = scaleX; 103 104 return FloatSize(scaleX, scaleY); 105 } 106 107 108 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op) 109 { 110 if (mayFillWithSolidColor()) { 111 fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op); 112 return; 113 } 114 115 FloatSize intrinsicTileSize = size(); 116 if (hasRelativeWidth()) 117 intrinsicTileSize.setWidth(scaledTileSize.width()); 118 if (hasRelativeHeight()) 119 intrinsicTileSize.setHeight(scaledTileSize.height()); 120 121 FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(), 122 scaledTileSize.height() / intrinsicTileSize.height()); 123 124 FloatRect oneTileRect; 125 oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), scaledTileSize.width()) - scaledTileSize.width(), scaledTileSize.width())); 126 oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), scaledTileSize.height()) - scaledTileSize.height(), scaledTileSize.height())); 127 oneTileRect.setSize(scaledTileSize); 128 129 // Check and see if a single draw of the image can cover the entire area we are supposed to tile. 130 if (oneTileRect.contains(destRect)) { 131 FloatRect visibleSrcRect; 132 visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width()); 133 visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height()); 134 visibleSrcRect.setWidth(destRect.width() / scale.width()); 135 visibleSrcRect.setHeight(destRect.height() / scale.height()); 136 draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op); 137 return; 138 } 139 140 AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height()); 141 FloatRect tileRect(FloatPoint(), intrinsicTileSize); 142 drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect); 143 144 startAnimation(); 145 } 146 147 // FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things. 148 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op) 149 { 150 if (mayFillWithSolidColor()) { 151 fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op); 152 return; 153 } 154 155 // FIXME: We do not support 'round' yet. For now just map it to 'repeat'. 156 if (hRule == RoundTile) 157 hRule = RepeatTile; 158 if (vRule == RoundTile) 159 vRule = RepeatTile; 160 161 FloatSize scale = calculatePatternScale(dstRect, srcRect, hRule, vRule); 162 AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height()); 163 164 // We want to construct the phase such that the pattern is centered (when stretch is not 165 // set for a particular rule). 166 float hPhase = scale.width() * srcRect.x(); 167 float vPhase = scale.height() * srcRect.y(); 168 if (hRule == Image::RepeatTile) 169 hPhase -= fmodf(dstRect.width(), scale.width() * srcRect.width()) / 2.0f; 170 if (vRule == Image::RepeatTile) 171 vPhase -= fmodf(dstRect.height(), scale.height() * srcRect.height()) / 2.0f; 172 FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase); 173 174 drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect); 175 176 startAnimation(); 177 } 178 179 180 } 181
