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 #ifndef CSSImageSetValue_h 27 #define CSSImageSetValue_h 28 29 #include "core/css/CSSValueList.h" 30 31 namespace WebCore { 32 33 class ResourceFetcher; 34 class StyleFetchedImageSet; 35 class StyleImage; 36 37 class CSSImageSetValue : public CSSValueList { 38 public: 39 create()40 static PassRefPtr<CSSImageSetValue> create() 41 { 42 return adoptRef(new CSSImageSetValue()); 43 } 44 ~CSSImageSetValue(); 45 46 StyleFetchedImageSet* cachedImageSet(ResourceFetcher*, float deviceScaleFactor); 47 48 // Returns a StyleFetchedImageSet if the best fit image has been cached already, otherwise a StylePendingImage. 49 StyleImage* cachedOrPendingImageSet(float); 50 51 String customCSSText() const; 52 isPending()53 bool isPending() const { return !m_accessedBestFitImage; } 54 55 struct ImageWithScale { 56 String imageURL; 57 float scaleFactor; 58 }; 59 60 bool hasFailedOrCanceledSubresources() const; 61 62 PassRefPtr<CSSImageSetValue> cloneForCSSOM() const; 63 64 protected: 65 ImageWithScale bestImageForScaleFactor(); 66 67 private: 68 CSSImageSetValue(); 69 explicit CSSImageSetValue(const CSSImageSetValue& cloneFrom); 70 71 void fillImageSet(); compareByScaleFactor(ImageWithScale first,ImageWithScale second)72 static inline bool compareByScaleFactor(ImageWithScale first, ImageWithScale second) { return first.scaleFactor < second.scaleFactor; } 73 74 RefPtr<StyleImage> m_imageSet; 75 bool m_accessedBestFitImage; 76 77 // This represents the scale factor that we used to find the best fit image. It does not necessarily 78 // correspond to the scale factor of the best fit image. 79 float m_scaleFactor; 80 81 Vector<ImageWithScale> m_imagesInSet; 82 }; 83 84 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageSetValue, isImageSetValue()); 85 86 } // namespace WebCore 87 88 #endif // CSSImageSetValue_h 89