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1 /* | |
2 * Copyright (C) 2014 Robert Hogan <robhogan@chromium.org>. | |
3 * | |
4 * This library is free software; you can redistribute it and/or | |
5 * modify it under the terms of the GNU Library General Public | |
6 * License as published by the Free Software Foundation; either | |
7 * version 2 of the License, or (at your option) any later version. | |
8 * | |
9 * This library is distributed in the hope that it will be useful, | |
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 * Library General Public License for more details. | |
13 * | |
14 * You should have received a copy of the GNU Library General Public License | |
15 * along with this library; see the file COPYING.LIB. If not, write to | |
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
17 * Boston, MA 02110-1301, USA. | |
18 * | |
19 */ | |
20 | |
21 #include "config.h" | |
22 #include "core/html/HTMLImageFallbackHelper.h" | |
23 | |
24 #include "core/HTMLNames.h" | |
25 #include "core/InputTypeNames.h" | |
26 #include "core/dom/ElementRareData.h" | |
27 #include "core/dom/Text.h" | |
28 #include "core/dom/shadow/ShadowRoot.h" | |
29 #include "core/fetch/ImageResource.h" | |
30 #include "core/html/FormDataList.h" | |
31 #include "core/html/HTMLDivElement.h" | |
32 #include "core/html/HTMLElement.h" | |
33 #include "core/html/HTMLImageElement.h" | |
34 #include "core/html/HTMLImageLoader.h" | |
35 #include "core/html/HTMLInputElement.h" | |
36 #include "core/html/HTMLStyleElement.h" | |
37 #include "wtf/PassOwnPtr.h" | |
38 #include "wtf/text/StringBuilder.h" | |
39 | |
40 namespace blink { | |
41 | |
42 using namespace HTMLNames; | |
43 | |
44 static bool noImageSourceSpecified(const Element& element) | |
45 { | |
46 bool noSrcSpecified = !element.hasAttribute(srcAttr) || element.getAttribute (srcAttr).isNull() || element.getAttribute(srcAttr).isEmpty(); | |
47 bool noSrcsetSpecified = !element.hasAttribute(srcsetAttr) || element.getAtt ribute(srcsetAttr).isNull() || element.getAttribute(srcsetAttr).isEmpty(); | |
48 return noSrcSpecified && noSrcsetSpecified; | |
49 } | |
50 | |
51 void HTMLImageFallbackHelper::createAltTextShadowTree(Element& element) | |
52 { | |
53 ShadowRoot& root = element.ensureUserAgentShadowRoot(); | |
54 RefPtrWillBeRawPtr<HTMLStyleElement> style = HTMLStyleElement::create(elemen t.document(), false); | |
55 root.appendChild(style); | |
56 style->setTextContent("#alttext-container { overflow: hidden; border: 1px so lid silver; padding: 1px; display: inline-block; box-sizing: border-box; } " | |
pdr.
2014/11/14 07:34:17
Having to parse these styles seems inefficient. I
| |
57 "#alttext { overflow: hidden; display: block; } " | |
58 "#alttext-image { margin: 0px; }"); | |
59 | |
60 RefPtrWillBeRawPtr<HTMLDivElement> container = HTMLDivElement::create(elemen t.document()); | |
61 root.appendChild(container); | |
62 container->setAttribute(idAttr, AtomicString("alttext-container", AtomicStri ng::ConstructFromLiteral)); | |
63 | |
64 RefPtrWillBeRawPtr<HTMLImageElement> brokenImage = HTMLImageElement::create( element.document()); | |
65 container->appendChild(brokenImage); | |
66 brokenImage->setIsFallbackImage(); | |
67 brokenImage->setAttribute(idAttr, AtomicString("alttext-image", AtomicString ::ConstructFromLiteral)); | |
68 brokenImage->setAttribute(widthAttr, AtomicString("16", AtomicString::Constr uctFromLiteral)); | |
69 brokenImage->setAttribute(heightAttr, AtomicString("16", AtomicString::Const ructFromLiteral)); | |
70 brokenImage->setAttribute(alignAttr, AtomicString("left", AtomicString::Cons tructFromLiteral)); | |
71 brokenImage->setAttribute(srcAttr, AtomicString("data:image/png;base64,iVBOR w0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABO0lEQVR4XpWRTytEYRTG3/tHLGQr" | |
pdr.
2014/11/14 07:34:17
Is this just to support the spec's suggestion of a
| |
72 "NfEBpKQkmc8gG0ulxpRsfQ0TTXbI3kZ2ys4tsyBZjN1N8idlYUYaxJzzOKf7ztG1MfN0ens 69/x6" | |
73 "n/eeYPuo7npS9bCOriXDMQOCTVbO3X+6Wp9mICZWAHqquE1qAA8EQRiFcmYMsQKsAHM2DeK V4qj4" | |
pdr.
2014/11/14 07:34:17
Can we use ImageResource::brokenImage(...) here, a
rhogan
2014/11/14 19:23:19
I can't see a way of doing that other than to use
| |
74 "8ZHB++bHwcXTQ+Mz6u/rABwSIQO0wKW5wuLU8E5yWzlJS7OFvaUJMGelAFkkYici1NIXB4D QbH1J" | |
75 "Y2ggVoD4N1Kb2AAA149vUmLLxbHaTaNynIJggAz7G7jTyjB5wOv79/LupT47Cu0rcT6S/ai 755YU" | |
76 "iMM4cgw4/I3ERAaI3y/PiFnYPHOBtfORLKX38AaBERaJbHFeAOY3Eu8ZOYByi7Pl+hzWN+n wWjVB" | |
77 "15LhYHXr1PWiH0AYTw4BBjO9AAAAAElFTkSuQmCC", AtomicString::ConstructFromL iteral)); | |
78 | |
79 RefPtrWillBeRawPtr<HTMLDivElement> altText = HTMLDivElement::create(element. document()); | |
80 container->appendChild(altText); | |
81 altText->setAttribute(idAttr, AtomicString("alttext", AtomicString::Construc tFromLiteral)); | |
82 | |
83 RefPtrWillBeRawPtr<Text> text = Text::create(element.document(), toHTMLEleme nt(element).altText()); | |
84 altText->appendChild(text); | |
85 } | |
86 | |
87 PassRefPtr<RenderStyle> HTMLImageFallbackHelper::customStyleForAltText(Element& element, PassRefPtr<RenderStyle> newStyle) | |
88 { | |
89 // If we have an author shadow root or have not created the UA shadow root y et, bail early. We can't | |
90 // use ensureUserAgentShadowRoot() here because that would alter the DOM tre e during style recalc. | |
91 if (element.shadowRoot() || !element.userAgentShadowRoot()) | |
92 return newStyle; | |
93 | |
94 Element* placeHolder = element.userAgentShadowRoot()->getElementById("alttex t-container"); | |
95 Element* brokenImage = element.userAgentShadowRoot()->getElementById("alttex t-image"); | |
96 | |
97 if (element.document().inQuirksMode()) { | |
98 // Mimic the behaviour of the image host by setting symmetric dimensions if only one dimension is specified. | |
99 if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isA uto()) | |
100 newStyle->setHeight(newStyle->width()); | |
101 else if (newStyle->height().isSpecifiedOrIntrinsic() && newStyle->width( ).isAuto()) | |
102 newStyle->setWidth(newStyle->height()); | |
103 if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isS pecifiedOrIntrinsic()) { | |
104 placeHolder->setInlineStyleProperty(CSSPropertyVerticalAlign, CSSVal ueBaseline); | |
105 } | |
106 } | |
107 | |
108 // If the image has specified dimensions allow the alt-text container expand to fill them. | |
109 if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isSpeci fiedOrIntrinsic()) { | |
110 placeHolder->setInlineStyleProperty(CSSPropertyWidth, 100, CSSPrimitiveV alue::CSS_PERCENTAGE); | |
111 placeHolder->setInlineStyleProperty(CSSPropertyHeight, 100, CSSPrimitive Value::CSS_PERCENTAGE); | |
112 } | |
113 | |
114 // Make sure the broken image icon appears on the appropriate side of the im age for the element's writing direction. | |
115 brokenImage->setInlineStyleProperty(CSSPropertyFloat, AtomicString(newStyle- >direction() == LTR ? "left" : "right")); | |
pdr.
2014/11/14 07:34:17
Is there a test for this? Does the alt text proper
rhogan
2014/11/14 19:23:19
Yes - fast/text/bidi-img-alt-text.html - and yes,
| |
116 | |
117 // This is an <img> with no attributes, so don't display anything. | |
118 if (noImageSourceSpecified(element) && !newStyle->width().isSpecifiedOrIntri nsic() && !newStyle->height().isSpecifiedOrIntrinsic() && toHTMLElement(element) .altText().isEmpty()) | |
119 newStyle->setDisplay(NONE); | |
120 | |
121 // This preserves legacy behaviour originally defined when alt-text was mana ged by RenderImage. | |
122 if (noImageSourceSpecified(element)) | |
123 brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone); | |
124 else | |
125 brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueInline); | |
126 | |
127 return newStyle; | |
128 } | |
129 | |
130 } // namespace blink | |
131 | |
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