A sizes attribute parser

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * 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/HTMLImageElement.h"
 
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "RuntimeEnabledFeatures.h"
 #include "bindings/v8/ScriptEventListener.h"
+#include "core/css/parser/SizesAttributeParser.h"
 #include "core/dom/Attribute.h"
 #include "core/fetch/ImageResource.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/html/parser/HTMLSrcsetParser.h"
 #include "core/rendering/RenderImage.h"
 
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 HTMLImageElement::HTMLImageElement(Document& document, HTMLFormElement* form)
     : HTMLElement(imgTag, document)
     , m_imageLoader(this)
     , m_compositeOperator(CompositeSourceOver)
     , m_imageDevicePixelRatio(1.0f)
     , m_formWasSetByParser(false)
+    , m_effectiveSize(0)
 {
     ScriptWrappable::init(this);
     if (form && form->inDocument()) {
         m_form = form->createWeakPtr();
         m_formWasSetByParser = true;
         m_form->associate(*this);
         m_form->didAssociateByParser();
     }
 }
 
@@ skipping 96 matching lines @@
             int effectiveSize = -1; // FIXME - hook up the real value from `sizes`
             ImageCandidate candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), effectiveSize, fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr));
             m_bestFitImageURL = candidate.toAtomicString();
             float candidateScaleFactor = candidate.scaleFactor();
             if (candidateScaleFactor > 0)
                 m_imageDevicePixelRatio = 1 / candidateScaleFactor;
             if (renderer() && renderer()->isImage())
                 toRenderImage(renderer())->setImageDevicePixelRatio(m_imageDevicePixelRatio);
         }
         m_imageLoader.updateFromElementIgnoringPreviousError();
+    } else if (RuntimeEnabledFeatures::pictureSizesEnabled() && name == sizesAttr) {
+        m_effectiveSize = SizesAttributeParser::findEffectiveSize(value, MediaValues::create(document(), MediaValues::DynamicMode));
     } else if (name == usemapAttr) {
         setIsLink(!value.isNull());
     } else if (name == compositeAttr) {
         // FIXME: images don't support blend modes in their compositing attribute.
         blink::WebBlendMode blendOp = blink::WebBlendModeNormal;
         if (!parseCompositeAndBlendOperator(value, m_compositeOperator, blendOp))
             m_compositeOperator = CompositeSourceOver;
     } else {
         HTMLElement::parseAttribute(name, value);
     }
@@ skipping 289 matching lines @@
     if (!image)
         return FloatSize();
     LayoutSize size;
     size = image->imageSizeForRenderer(renderer(), 1.0f); // FIXME: Not sure about this.
     if (renderer() && renderer()->isRenderImage() && image->image() && !image->image()->hasRelativeWidth())
         size.scale(toRenderImage(renderer())->imageDevicePixelRatio());
     return size;
 }
 
 }