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 "platform/graphics/Image.h" 29 30#include "platform/Length.h" 31#include "platform/MIMETypeRegistry.h" 32#include "platform/SharedBuffer.h" 33#include "platform/TraceEvent.h" 34#include "platform/geometry/FloatPoint.h" 35#include "platform/geometry/FloatRect.h" 36#include "platform/geometry/FloatSize.h" 37#include "platform/graphics/BitmapImage.h" 38#include "platform/graphics/GraphicsContext.h" 39#include "platform/graphics/GraphicsContextStateSaver.h" 40#include "public/platform/Platform.h" 41#include "public/platform/WebData.h" 42#include "wtf/MainThread.h" 43#include "wtf/StdLibExtras.h" 44 45#include <math.h> 46 47namespace blink { 48 49Image::Image(ImageObserver* observer) 50 : m_imageObserver(observer) 51{ 52} 53 54Image::~Image() 55{ 56} 57 58Image* Image::nullImage() 59{ 60 ASSERT(isMainThread()); 61 DEFINE_STATIC_REF(Image, nullImage, (BitmapImage::create())); 62 return nullImage; 63} 64 65PassRefPtr<Image> Image::loadPlatformResource(const char *name) 66{ 67 const WebData& resource = Platform::current()->loadResource(name); 68 if (resource.isEmpty()) 69 return Image::nullImage(); 70 71 RefPtr<Image> image = BitmapImage::create(); 72 image->setData(resource, true); 73 return image.release(); 74} 75 76bool Image::supportsType(const String& type) 77{ 78 return MIMETypeRegistry::isSupportedImageResourceMIMEType(type); 79} 80 81bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived) 82{ 83 m_encodedImageData = data; 84 if (!m_encodedImageData.get()) 85 return true; 86 87 int length = m_encodedImageData->size(); 88 if (!length) 89 return true; 90 91 return dataChanged(allDataReceived); 92} 93 94void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, CompositeOperator op) 95{ 96 if (!color.alpha()) 97 return; 98 99 CompositeOperator previousOperator = ctxt->compositeOperation(); 100 ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op); 101 ctxt->fillRect(dstRect, color); 102 ctxt->setCompositeOperation(previousOperator); 103} 104 105FloatRect Image::adjustForNegativeSize(const FloatRect& rect) 106{ 107 FloatRect norm = rect; 108 if (norm.width() < 0) { 109 norm.setX(norm.x() + norm.width()); 110 norm.setWidth(-norm.width()); 111 } 112 if (norm.height() < 0) { 113 norm.setY(norm.y() + norm.height()); 114 norm.setHeight(-norm.height()); 115 } 116 return norm; 117} 118 119void Image::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator op, WebBlendMode blendMode, RespectImageOrientationEnum) 120{ 121 draw(ctx, dstRect, srcRect, op, blendMode); 122} 123 124void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, CompositeOperator op, WebBlendMode blendMode, const IntSize& repeatSpacing) 125{ 126 if (mayFillWithSolidColor()) { 127 fillWithSolidColor(ctxt, destRect, solidColor(), op); 128 return; 129 } 130 131 // See <https://webkit.org/b/59043>. 132 ASSERT(!isBitmapImage() || notSolidColor()); 133 134 FloatSize intrinsicTileSize = size(); 135 if (hasRelativeWidth()) 136 intrinsicTileSize.setWidth(scaledTileSize.width()); 137 if (hasRelativeHeight()) 138 intrinsicTileSize.setHeight(scaledTileSize.height()); 139 140 FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(), 141 scaledTileSize.height() / intrinsicTileSize.height()); 142 143 FloatSize actualTileSize(scaledTileSize.width() + repeatSpacing.width(), scaledTileSize.height() + repeatSpacing.height()); 144 FloatRect oneTileRect; 145 oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), actualTileSize.width()) - actualTileSize.width(), actualTileSize.width())); 146 oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), actualTileSize.height()) - actualTileSize.height(), actualTileSize.height())); 147 oneTileRect.setSize(scaledTileSize); 148 149 // Check and see if a single draw of the image can cover the entire area we are supposed to tile. 150 if (oneTileRect.contains(destRect)) { 151 FloatRect visibleSrcRect; 152 visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width()); 153 visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height()); 154 visibleSrcRect.setWidth(destRect.width() / scale.width()); 155 visibleSrcRect.setHeight(destRect.height() / scale.height()); 156 draw(ctxt, destRect, visibleSrcRect, op, blendMode); 157 return; 158 } 159 160 FloatRect tileRect(FloatPoint(), intrinsicTileSize); 161 drawPattern(ctxt, tileRect, scale, oneTileRect.location(), op, destRect, blendMode, repeatSpacing); 162 163 startAnimation(); 164} 165 166// FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things. 167void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, 168 const FloatSize& providedTileScaleFactor, TileRule hRule, TileRule vRule, CompositeOperator op) 169{ 170 if (mayFillWithSolidColor()) { 171 fillWithSolidColor(ctxt, dstRect, solidColor(), op); 172 return; 173 } 174 175 // FIXME: We do not support 'space' yet. For now just map it to 'repeat'. 176 if (hRule == SpaceTile) 177 hRule = RepeatTile; 178 if (vRule == SpaceTile) 179 vRule = RepeatTile; 180 181 // FIXME: if this code is used for background-repeat: round (in addition to 182 // border-image-repeat), then add logic to deal with the background-size: auto 183 // special case. The aspect ratio should be maintained in this case. 184 FloatSize tileScaleFactor = providedTileScaleFactor; 185 bool useLowInterpolationQuality = false; 186 if (hRule == RoundTile) { 187 float hRepetitions = std::max(1.0f, roundf(dstRect.width() / (tileScaleFactor.width() * srcRect.width()))); 188 tileScaleFactor.setWidth(dstRect.width() / (srcRect.width() * hRepetitions)); 189 } 190 if (vRule == RoundTile) { 191 float vRepetitions = std::max(1.0f, roundf(dstRect.height() / (tileScaleFactor.height() * srcRect.height()))); 192 tileScaleFactor.setHeight(dstRect.height() / (srcRect.height() * vRepetitions)); 193 } 194 if (hRule == RoundTile || vRule == RoundTile) { 195 // High interpolation quality rounds the scaled tile to an integer size (see Image::drawPattern). 196 // To avoid causing a visual problem, linear interpolation must be used instead. 197 // FIXME: Allow using high-quality interpolation in this case, too. 198 useLowInterpolationQuality = true; 199 } 200 201 // We want to construct the phase such that the pattern is centered (when stretch is not 202 // set for a particular rule). 203 float hPhase = tileScaleFactor.width() * srcRect.x(); 204 float vPhase = tileScaleFactor.height() * srcRect.y(); 205 float scaledTileWidth = tileScaleFactor.width() * srcRect.width(); 206 float scaledTileHeight = tileScaleFactor.height() * srcRect.height(); 207 if (hRule == Image::RepeatTile) 208 hPhase -= (dstRect.width() - scaledTileWidth) / 2; 209 if (vRule == Image::RepeatTile) 210 vPhase -= (dstRect.height() - scaledTileHeight) / 2; 211 FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase); 212 213 if (useLowInterpolationQuality) { 214 InterpolationQuality previousInterpolationQuality = ctxt->imageInterpolationQuality(); 215 ctxt->setImageInterpolationQuality(InterpolationLow); 216 drawPattern(ctxt, srcRect, tileScaleFactor, patternPhase, op, dstRect); 217 ctxt->setImageInterpolationQuality(previousInterpolationQuality); 218 } else { 219 drawPattern(ctxt, srcRect, tileScaleFactor, patternPhase, op, dstRect); 220 } 221 222 startAnimation(); 223} 224 225void Image::drawPattern(GraphicsContext* context, const FloatRect& floatSrcRect, const FloatSize& scale, 226 const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& destRect, WebBlendMode blendMode, const IntSize& repeatSpacing) 227{ 228 TRACE_EVENT0("skia", "Image::drawPattern"); 229 if (RefPtr<NativeImageSkia> bitmap = nativeImageForCurrentFrame()) 230 bitmap->drawPattern(context, adjustForNegativeSize(floatSrcRect), scale, phase, compositeOp, destRect, blendMode, repeatSpacing); 231} 232 233void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) 234{ 235 intrinsicRatio = size(); 236 intrinsicWidth = Length(intrinsicRatio.width(), Fixed); 237 intrinsicHeight = Length(intrinsicRatio.height(), Fixed); 238} 239 240PassRefPtr<Image> Image::imageForDefaultFrame() 241{ 242 RefPtr<Image> image(this); 243 244 return image.release(); 245} 246 247} // namespace blink 248