Index: Source/core/html/HTMLImageFallbackHelper.cpp |
diff --git a/Source/core/html/HTMLImageFallbackHelper.cpp b/Source/core/html/HTMLImageFallbackHelper.cpp |
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+/* |
+ * Copyright (C) 2014 Robert Hogan <robhogan@chromium.org>. |
+ * |
+ * This library is free software; you can redistribute it and/or |
+ * modify it under the terms of the GNU Library General Public |
+ * License as published by the Free Software Foundation; either |
+ * version 2 of the License, or (at your option) any later version. |
+ * |
+ * This library is distributed in the hope that it will be useful, |
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of |
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
+ * Library General Public License for more details. |
+ * |
+ * You should have received a copy of the GNU Library General Public License |
+ * along with this library; see the file COPYING.LIB. If not, write to |
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
+ * Boston, MA 02110-1301, USA. |
+ * |
+ */ |
+ |
+#include "config.h" |
+#include "core/html/HTMLImageFallbackHelper.h" |
+ |
+#include "core/HTMLNames.h" |
+#include "core/InputTypeNames.h" |
+#include "core/dom/ElementRareData.h" |
+#include "core/dom/Text.h" |
+#include "core/dom/shadow/ShadowRoot.h" |
+#include "core/fetch/ImageResource.h" |
+#include "core/html/FormDataList.h" |
+#include "core/html/HTMLDivElement.h" |
+#include "core/html/HTMLElement.h" |
+#include "core/html/HTMLImageElement.h" |
+#include "core/html/HTMLImageLoader.h" |
+#include "core/html/HTMLInputElement.h" |
+#include "core/html/HTMLStyleElement.h" |
+#include "wtf/PassOwnPtr.h" |
+#include "wtf/text/StringBuilder.h" |
+ |
+namespace blink { |
+ |
+using namespace HTMLNames; |
+ |
+static bool noImageSourceSpecified(const Element& element) |
+{ |
+ bool noSrcSpecified = !element.hasAttribute(srcAttr) || element.getAttribute(srcAttr).isNull() || element.getAttribute(srcAttr).isEmpty(); |
+ bool noSrcsetSpecified = !element.hasAttribute(srcsetAttr) || element.getAttribute(srcsetAttr).isNull() || element.getAttribute(srcsetAttr).isEmpty(); |
+ return noSrcSpecified && noSrcsetSpecified; |
+} |
+ |
+void HTMLImageFallbackHelper::createAltTextShadowTree(Element& element) |
+{ |
+ ShadowRoot& root = element.ensureUserAgentShadowRoot(); |
+ RefPtrWillBeRawPtr<HTMLStyleElement> style = HTMLStyleElement::create(element.document(), false); |
+ root.appendChild(style); |
+ style->setTextContent("#alttext-container { overflow: hidden; border: 1px solid silver; padding: 1px; display: inline-block; box-sizing: border-box; } " |
+ "#alttext { overflow: hidden; display: block; } " |
+ "#alttext-image { margin: 0px; }"); |
+ |
+ RefPtrWillBeRawPtr<HTMLDivElement> container = HTMLDivElement::create(element.document()); |
+ root.appendChild(container); |
+ container->setAttribute(idAttr, AtomicString("alttext-container", AtomicString::ConstructFromLiteral)); |
+ |
+ RefPtrWillBeRawPtr<HTMLImageElement> brokenImage = HTMLImageElement::create(element.document()); |
+ container->appendChild(brokenImage); |
+ brokenImage->setIsFallbackImage(); |
+ brokenImage->setAttribute(idAttr, AtomicString("alttext-image", AtomicString::ConstructFromLiteral)); |
+ brokenImage->setAttribute(widthAttr, AtomicString("16", AtomicString::ConstructFromLiteral)); |
+ brokenImage->setAttribute(heightAttr, AtomicString("16", AtomicString::ConstructFromLiteral)); |
+ brokenImage->setAttribute(alignAttr, AtomicString("left", AtomicString::ConstructFromLiteral)); |
+ brokenImage->setAttribute(srcAttr, AtomicString("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABO0lEQVR4XpWRTytEYRTG3/tHLGQr" |
esprehn
2014/11/11 19:06:06
What happens in CSP mode? Can data urls be loaded?
rhogan
2014/11/11 19:43:06
They can as long as the security policy permits th
|
+ "NfEBpKQkmc8gG0ulxpRsfQ0TTXbI3kZ2ys4tsyBZjN1N8idlYUYaxJzzOKf7ztG1MfN0ens69/x6" |
+ "n/eeYPuo7npS9bCOriXDMQOCTVbO3X+6Wp9mICZWAHqquE1qAA8EQRiFcmYMsQKsAHM2DeKV4qj4" |
+ "8ZHB++bHwcXTQ+Mz6u/rABwSIQO0wKW5wuLU8E5yWzlJS7OFvaUJMGelAFkkYici1NIXB4DQbH1J" |
+ "Y2ggVoD4N1Kb2AAA149vUmLLxbHaTaNynIJggAz7G7jTyjB5wOv79/LupT47Cu0rcT6S/ai755YU" |
+ "iMM4cgw4/I3ERAaI3y/PiFnYPHOBtfORLKX38AaBERaJbHFeAOY3Eu8ZOYByi7Pl+hzWN+nwWjVB" |
+ "15LhYHXr1PWiH0AYTw4BBjO9AAAAAElFTkSuQmCC", AtomicString::ConstructFromLiteral)); |
+ |
+ RefPtrWillBeRawPtr<HTMLDivElement> altText = HTMLDivElement::create(element.document()); |
+ container->appendChild(altText); |
+ altText->setAttribute(idAttr, AtomicString("alttext", AtomicString::ConstructFromLiteral)); |
+ |
+ RefPtrWillBeRawPtr<Text> text = Text::create(element.document(), toHTMLElement(element).altText()); |
+ altText->appendChild(text); |
+} |
+ |
+PassRefPtr<RenderStyle> HTMLImageFallbackHelper::customStyleForAltText(Element& element, PassRefPtr<RenderStyle> newStyle) |
+{ |
+ // If we have an author shadow root or have not created the UA shadow root yet, bail early. We can't |
+ // use ensureUserAgentShadowRoot() here because that would alter the DOM tree during style recalc. |
+ if (element.shadowRoot() || !element.userAgentShadowRoot()) |
+ return newStyle; |
+ |
+ Element* placeHolder = element.userAgentShadowRoot()->getElementById("alttext-container"); |
+ Element* brokenImage = element.userAgentShadowRoot()->getElementById("alttext-image"); |
+ |
+ if (element.document().inQuirksMode()) { |
+ // Mimic the behaviour of the image host by setting symmetric dimensions if only one dimension is specified. |
+ if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isAuto()) |
+ newStyle->setHeight(newStyle->width()); |
+ else if (newStyle->height().isSpecifiedOrIntrinsic() && newStyle->width().isAuto()) |
+ newStyle->setWidth(newStyle->height()); |
+ if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isSpecifiedOrIntrinsic()) { |
+ placeHolder->setInlineStyleProperty(CSSPropertyVerticalAlign, CSSValueBaseline); |
+ } |
+ } |
+ |
+ // If the image has specified dimensions allow the alt-text container expand to fill them. |
+ if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isSpecifiedOrIntrinsic()) { |
+ placeHolder->setInlineStyleProperty(CSSPropertyWidth, 100, CSSPrimitiveValue::CSS_PERCENTAGE); |
+ placeHolder->setInlineStyleProperty(CSSPropertyHeight, 100, CSSPrimitiveValue::CSS_PERCENTAGE); |
+ } |
+ |
+ // Make sure the broken image icon appears on the appropriate side of the image for the element's writing direction. |
+ brokenImage->setInlineStyleProperty(CSSPropertyFloat, AtomicString(newStyle->direction() == LTR ? "left" : "right")); |
+ |
+ // This is an <img> with no attributes, so don't display anything. |
+ if (noImageSourceSpecified(element) && !newStyle->width().isSpecifiedOrIntrinsic() && !newStyle->height().isSpecifiedOrIntrinsic() && toHTMLElement(element).altText().isEmpty()) |
+ newStyle->setDisplay(NONE); |
+ |
+ // This preserves legacy behaviour originally defined when alt-text was managed by RenderImage. |
+ if (noImageSourceSpecified(element)) |
+ brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone); |
+ else |
+ brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueInline); |
+ |
+ return newStyle; |
+} |
+ |
+} // namespace blink |
+ |