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 THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_FETCHED_IMAGE_SET_H_ 27 #define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_FETCHED_IMAGE_SET_H_ 28 29 #include "third_party/blink/renderer/core/loader/resource/image_resource_observer.h" 30 #include "third_party/blink/renderer/core/style/style_image.h" 31 #include "third_party/blink/renderer/platform/geometry/layout_size.h" 32 #include "third_party/blink/renderer/platform/weborigin/kurl.h" 33 #include "third_party/blink/renderer/platform/wtf/casting.h" 34 35 namespace blink { 36 37 class CSSImageSetValue; 38 class ImageResourceObserver; 39 40 // This class represents an <image> that loads one image resource out of a set 41 // of alternatives (the -webkit-image-set(...) function.) 42 // 43 // This class keeps one cached image from the set, and has access to a set of 44 // alternatives via the referenced CSSImageSetValue. 45 class StyleFetchedImageSet final : public StyleImage, 46 public ImageResourceObserver { 47 USING_PRE_FINALIZER(StyleFetchedImageSet, Dispose); 48 49 public: 50 StyleFetchedImageSet(ImageResourceContent*, 51 float image_scale_factor, 52 CSSImageSetValue*, 53 const KURL&); 54 ~StyleFetchedImageSet() override; 55 56 CSSValue* CssValue() const override; 57 CSSValue* ComputedCSSValue(const ComputedStyle&, 58 bool allow_visited_style) const override; 59 60 // FIXME: This is used by StyleImage for equals comparison, but this 61 // implementation only looks at the image from the set that we have loaded. 62 // I'm not sure if that is meaningful enough or not. 63 WrappedImagePtr Data() const override; 64 65 bool CanRender() const override; 66 bool IsLoaded() const override; 67 bool ErrorOccurred() const override; 68 FloatSize ImageSize(const Document&, 69 float multiplier, 70 const FloatSize& default_object_size, 71 RespectImageOrientationEnum) const override; 72 bool HasIntrinsicSize() const override; 73 void AddClient(ImageResourceObserver*) override; 74 void RemoveClient(ImageResourceObserver*) override; 75 scoped_refptr<Image> GetImage(const ImageResourceObserver&, 76 const Document&, 77 const ComputedStyle&, 78 const FloatSize& target_size) const override; ImageScaleFactor()79 float ImageScaleFactor() const override { return image_scale_factor_; } 80 bool KnownToBeOpaque(const Document&, const ComputedStyle&) const override; 81 ImageResourceContent* CachedImage() const override; 82 83 void Trace(Visitor*) const override; 84 85 private: 86 bool IsEqual(const StyleImage& other) const override; 87 void Dispose(); 88 89 // ImageResourceObserver overrides DebugName()90 String DebugName() const override { return "StyleFetchedImageSet"; } 91 92 Member<ImageResourceContent> best_fit_image_; 93 float image_scale_factor_; 94 95 Member<CSSImageSetValue> image_set_value_; // Not retained; it owns us. 96 const KURL url_; 97 }; 98 99 template <> 100 struct DowncastTraits<StyleFetchedImageSet> { 101 static bool AllowFrom(const StyleImage& styleImage) { 102 return styleImage.IsImageResourceSet(); 103 } 104 }; 105 106 } // namespace blink 107 108 #endif // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_FETCHED_IMAGE_SET_H_ 109