1/* 2 * Copyright (C) 2006 Samuel Weinig (sam.weinig@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 "ImageObserver.h" 34#include "IntRect.h" 35#include "Length.h" 36#include "MIMETypeRegistry.h" 37#include "SharedBuffer.h" 38#include <math.h> 39#include <wtf/MainThread.h> 40#include <wtf/StdLibExtras.h> 41 42#if USE(CG) 43#include <CoreFoundation/CoreFoundation.h> 44#endif 45 46namespace WebCore { 47 48Image::Image(ImageObserver* observer) 49 : m_imageObserver(observer) 50{ 51} 52 53Image::~Image() 54{ 55} 56 57Image* Image::nullImage() 58{ 59 ASSERT(isMainThread()); 60 DEFINE_STATIC_LOCAL(RefPtr<Image>, nullImage, (BitmapImage::create()));; 61 return nullImage.get(); 62} 63 64bool Image::supportsType(const String& type) 65{ 66 return MIMETypeRegistry::isSupportedImageResourceMIMEType(type); 67} 68 69bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived) 70{ 71 m_encodedImageData = data; 72 if (!m_encodedImageData.get()) 73 return true; 74 75 int length = m_encodedImageData->size(); 76 if (!length) 77 return true; 78 79 return dataChanged(allDataReceived); 80} 81 82void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op) 83{ 84 if (!color.alpha()) 85 return; 86 87 CompositeOperator previousOperator = ctxt->compositeOperation(); 88 ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op); 89 ctxt->fillRect(dstRect, color, styleColorSpace); 90 ctxt->setCompositeOperation(previousOperator); 91} 92 93void Image::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace styleColorSpace, CompositeOperator op, BlendMode blendMode, RespectImageOrientationEnum) 94{ 95 draw(ctx, dstRect, srcRect, styleColorSpace, op, blendMode); 96} 97 98void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op, BlendMode blendMode) 99{ 100 if (mayFillWithSolidColor()) { 101 fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op); 102 return; 103 } 104 105 ASSERT(!isBitmapImage() || notSolidColor()); 106 107 FloatSize intrinsicTileSize = size(); 108 if (hasRelativeWidth()) 109 intrinsicTileSize.setWidth(scaledTileSize.width()); 110 if (hasRelativeHeight()) 111 intrinsicTileSize.setHeight(scaledTileSize.height()); 112 113 FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(), 114 scaledTileSize.height() / intrinsicTileSize.height()); 115 116 FloatRect oneTileRect; 117 oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), scaledTileSize.width()) - scaledTileSize.width(), scaledTileSize.width())); 118 oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), scaledTileSize.height()) - scaledTileSize.height(), scaledTileSize.height())); 119 oneTileRect.setSize(scaledTileSize); 120 121 // Check and see if a single draw of the image can cover the entire area we are supposed to tile. 122 if (oneTileRect.contains(destRect)) { 123 FloatRect visibleSrcRect; 124 visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width()); 125 visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height()); 126 visibleSrcRect.setWidth(destRect.width() / scale.width()); 127 visibleSrcRect.setHeight(destRect.height() / scale.height()); 128 draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op, blendMode); 129 return; 130 } 131 132 AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height()); 133 FloatRect tileRect(FloatPoint(), intrinsicTileSize); 134 drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect, blendMode); 135 136 startAnimation(); 137} 138 139// FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things. 140void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, 141 const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op) 142{ 143 if (mayFillWithSolidColor()) { 144 fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op); 145 return; 146 } 147 148 // FIXME: We do not support 'round' or 'space' yet. For now just map them to 'repeat'. 149 if (hRule == RoundTile || hRule == SpaceTile) 150 hRule = RepeatTile; 151 if (vRule == RoundTile || vRule == SpaceTile) 152 vRule = RepeatTile; 153 154 AffineTransform patternTransform = AffineTransform().scaleNonUniform(tileScaleFactor.width(), tileScaleFactor.height()); 155 156 // We want to construct the phase such that the pattern is centered (when stretch is not 157 // set for a particular rule). 158 float hPhase = tileScaleFactor.width() * srcRect.x(); 159 float vPhase = tileScaleFactor.height() * srcRect.y(); 160 float scaledTileWidth = tileScaleFactor.width() * srcRect.width(); 161 float scaledTileHeight = tileScaleFactor.height() * srcRect.height(); 162 if (hRule == Image::RepeatTile) 163 hPhase -= (dstRect.width() - scaledTileWidth) / 2; 164 if (vRule == Image::RepeatTile) 165 vPhase -= (dstRect.height() - scaledTileHeight) / 2; 166 FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase); 167 168 drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect); 169 170 startAnimation(); 171} 172 173#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING) 174FloatRect Image::adjustSourceRectForDownSampling(const FloatRect& srcRect, const IntSize& scaledSize) const 175{ 176 const IntSize unscaledSize = size(); 177 if (unscaledSize == scaledSize) 178 return srcRect; 179 180 // Image has been down-sampled. 181 float xscale = static_cast<float>(scaledSize.width()) / unscaledSize.width(); 182 float yscale = static_cast<float>(scaledSize.height()) / unscaledSize.height(); 183 FloatRect scaledSrcRect = srcRect; 184 scaledSrcRect.scale(xscale, yscale); 185 186 return scaledSrcRect; 187} 188#endif 189 190void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) 191{ 192 intrinsicRatio = size(); 193 intrinsicWidth = Length(intrinsicRatio.width(), Fixed); 194 intrinsicHeight = Length(intrinsicRatio.height(), Fixed); 195} 196 197} 198