Revert of Use Shadow DOM to display fallback content for images

Source/core/html/HTMLImageFallbackHelper.cpp

Index: Source/core/html/HTMLImageFallbackHelper.cpp
diff --git a/Source/core/html/HTMLImageFallbackHelper.cpp b/Source/core/html/HTMLImageFallbackHelper.cpp
deleted file mode 100644
index 981f8cc72469f7c645be4214774e6afa76339ba7..0000000000000000000000000000000000000000
--- a/Source/core/html/HTMLImageFallbackHelper.cpp
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * 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();
-    RefPtr<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; }");
-
-    RefPtr<HTMLDivElement> container = HTMLDivElement::create(element.document());
-    root.appendChild(container);
-    container->setAttribute(idAttr, AtomicString("alttext-container", AtomicString::ConstructFromLiteral));
-
-    RefPtr<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"
-        "NfEBpKQkmc8gG0ulxpRsfQ0TTXbI3kZ2ys4tsyBZjN1N8idlYUYaxJzzOKf7ztG1MfN0ens69/x6"
-        "n/eeYPuo7npS9bCOriXDMQOCTVbO3X+6Wp9mICZWAHqquE1qAA8EQRiFcmYMsQKsAHM2DeKV4qj4"
-        "8ZHB++bHwcXTQ+Mz6u/rABwSIQO0wKW5wuLU8E5yWzlJS7OFvaUJMGelAFkkYici1NIXB4DQbH1J"
-        "Y2ggVoD4N1Kb2AAA149vUmLLxbHaTaNynIJggAz7G7jTyjB5wOv79/LupT47Cu0rcT6S/ai755YU"
-        "iMM4cgw4/I3ERAaI3y/PiFnYPHOBtfORLKX38AaBERaJbHFeAOY3Eu8ZOYByi7Pl+hzWN+nwWjVB"
-        "15LhYHXr1PWiH0AYTw4BBjO9AAAAAElFTkSuQmCC", AtomicString::ConstructFromLiteral));
-
-    RefPtr<HTMLDivElement> altText = HTMLDivElement::create(element.document());
-    container->appendChild(altText);
-    altText->setAttribute(idAttr, AtomicString("alttext", AtomicString::ConstructFromLiteral));
-
-    RefPtr<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
-