1 /* 2 * Copyright (C) 2012 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 "core/css/CSSImageSetValue.h" 28 29 #include "core/FetchInitiatorTypeNames.h" 30 #include "core/css/CSSImageValue.h" 31 #include "core/css/CSSPrimitiveValue.h" 32 #include "core/dom/Document.h" 33 #include "core/fetch/FetchRequest.h" 34 #include "core/fetch/ImageResource.h" 35 #include "core/fetch/ResourceFetcher.h" 36 #include "core/rendering/style/StyleFetchedImageSet.h" 37 #include "core/rendering/style/StylePendingImage.h" 38 #include "wtf/text/StringBuilder.h" 39 40 namespace WebCore { 41 42 CSSImageSetValue::CSSImageSetValue() 43 : CSSValueList(ImageSetClass, CommaSeparator) 44 , m_accessedBestFitImage(false) 45 , m_scaleFactor(1) 46 { 47 } 48 49 CSSImageSetValue::~CSSImageSetValue() 50 { 51 if (m_imageSet && m_imageSet->isImageResourceSet()) 52 toStyleFetchedImageSet(m_imageSet)->clearImageSetValue(); 53 } 54 55 void CSSImageSetValue::fillImageSet() 56 { 57 size_t length = this->length(); 58 size_t i = 0; 59 while (i < length) { 60 CSSImageValue* imageValue = toCSSImageValue(item(i)); 61 String imageURL = imageValue->url(); 62 63 ++i; 64 ASSERT_WITH_SECURITY_IMPLICATION(i < length); 65 CSSValue* scaleFactorValue = item(i); 66 float scaleFactor = toCSSPrimitiveValue(scaleFactorValue)->getFloatValue(); 67 68 ImageWithScale image; 69 image.imageURL = imageURL; 70 image.referrer = imageValue->referrer(); 71 image.scaleFactor = scaleFactor; 72 m_imagesInSet.append(image); 73 ++i; 74 } 75 76 // Sort the images so that they are stored in order from lowest resolution to highest. 77 std::sort(m_imagesInSet.begin(), m_imagesInSet.end(), CSSImageSetValue::compareByScaleFactor); 78 } 79 80 CSSImageSetValue::ImageWithScale CSSImageSetValue::bestImageForScaleFactor() 81 { 82 ImageWithScale image; 83 size_t numberOfImages = m_imagesInSet.size(); 84 for (size_t i = 0; i < numberOfImages; ++i) { 85 image = m_imagesInSet.at(i); 86 if (image.scaleFactor >= m_scaleFactor) 87 return image; 88 } 89 return image; 90 } 91 92 StyleFetchedImageSet* CSSImageSetValue::cachedImageSet(ResourceFetcher* loader, float deviceScaleFactor, const ResourceLoaderOptions& options) 93 { 94 ASSERT(loader); 95 96 m_scaleFactor = deviceScaleFactor; 97 98 if (!m_imagesInSet.size()) 99 fillImageSet(); 100 101 if (!m_accessedBestFitImage) { 102 // FIXME: In the future, we want to take much more than deviceScaleFactor into acount here. 103 // All forms of scale should be included: Page::pageScaleFactor(), LocalFrame::pageZoomFactor(), 104 // and any CSS transforms. https://bugs.webkit.org/show_bug.cgi?id=81698 105 ImageWithScale image = bestImageForScaleFactor(); 106 if (Document* document = loader->document()) { 107 FetchRequest request(ResourceRequest(document->completeURL(image.imageURL)), FetchInitiatorTypeNames::css, options); 108 request.mutableResourceRequest().setHTTPReferrer(image.referrer); 109 110 if (options.corsEnabled == IsCORSEnabled) 111 request.setCrossOriginAccessControl(loader->document()->securityOrigin(), options.allowCredentials, options.credentialsRequested); 112 113 if (ResourcePtr<ImageResource> cachedImage = loader->fetchImage(request)) { 114 m_imageSet = StyleFetchedImageSet::create(cachedImage.get(), image.scaleFactor, this); 115 m_accessedBestFitImage = true; 116 } 117 } 118 } 119 120 return (m_imageSet && m_imageSet->isImageResourceSet()) ? toStyleFetchedImageSet(m_imageSet) : 0; 121 } 122 123 StyleFetchedImageSet* CSSImageSetValue::cachedImageSet(ResourceFetcher* fetcher, float deviceScaleFactor) 124 { 125 return cachedImageSet(fetcher, deviceScaleFactor, ResourceFetcher::defaultResourceOptions()); 126 } 127 128 StyleImage* CSSImageSetValue::cachedOrPendingImageSet(float deviceScaleFactor) 129 { 130 if (!m_imageSet) { 131 m_imageSet = StylePendingImage::create(this); 132 } else if (!m_imageSet->isPendingImage()) { 133 // If the deviceScaleFactor has changed, we may not have the best image loaded, so we have to re-assess. 134 if (deviceScaleFactor != m_scaleFactor) { 135 m_accessedBestFitImage = false; 136 m_imageSet = StylePendingImage::create(this); 137 } 138 } 139 140 return m_imageSet.get(); 141 } 142 143 String CSSImageSetValue::customCSSText() const 144 { 145 StringBuilder result; 146 result.append("-webkit-image-set("); 147 148 size_t length = this->length(); 149 size_t i = 0; 150 while (i < length) { 151 if (i > 0) 152 result.append(", "); 153 154 const CSSValue* imageValue = item(i); 155 result.append(imageValue->cssText()); 156 result.append(' '); 157 158 ++i; 159 ASSERT_WITH_SECURITY_IMPLICATION(i < length); 160 const CSSValue* scaleFactorValue = item(i); 161 result.append(scaleFactorValue->cssText()); 162 // FIXME: Eventually the scale factor should contain it's own unit http://wkb.ug/100120. 163 // For now 'x' is hard-coded in the parser, so we hard-code it here too. 164 result.append('x'); 165 166 ++i; 167 } 168 169 result.append(")"); 170 return result.toString(); 171 } 172 173 bool CSSImageSetValue::hasFailedOrCanceledSubresources() const 174 { 175 if (!m_imageSet || !m_imageSet->isImageResourceSet()) 176 return false; 177 if (Resource* cachedResource = toStyleFetchedImageSet(m_imageSet)->cachedImage()) 178 return cachedResource->loadFailedOrCanceled(); 179 return true; 180 } 181 182 CSSImageSetValue::CSSImageSetValue(const CSSImageSetValue& cloneFrom) 183 : CSSValueList(cloneFrom) 184 , m_accessedBestFitImage(false) 185 , m_scaleFactor(1) 186 { 187 // Non-CSSValueList data is not accessible through CSS OM, no need to clone. 188 } 189 190 PassRefPtrWillBeRawPtr<CSSImageSetValue> CSSImageSetValue::cloneForCSSOM() const 191 { 192 return adoptRefWillBeNoop(new CSSImageSetValue(*this)); 193 } 194 195 } // namespace WebCore 196
