Picture element initial implementation

Source/core/html/HTMLPictureElement.cpp

Index: Source/core/html/HTMLPictureElement.cpp
diff --git a/Source/core/html/HTMLPictureElement.cpp b/Source/core/html/HTMLPictureElement.cpp
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+/*
+ * 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"
+#if ENABLE(PICTURE)
+#include "HTMLPictureElement.h"
+
+#include "HTMLImageElement.h"
+
+#include "MediaList.h"
+#include "MediaQueryEvaluator.h"
+#include "StyleResolver.h"
+
+using namespace std;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+PassRefPtr<HTMLPictureElement> HTMLPictureElement::create(Document* document)
+{
+    return adoptRef(new HTMLPictureElement(imgTag, document));
+}
+
+PassRefPtr<HTMLPictureElement> HTMLPictureElement::create(const QualifiedName& tagName, Document* document)
+{
+    return adoptRef(new HTMLPictureElement(tagName, document));
+}
+
+HTMLPictureElement::~HTMLPictureElement()
+{
+}
+
+PassRefPtr<HTMLPictureElement> HTMLPictureElement::createForJSConstructor(Document* document, const int* optionalWidth, const int* optionalHeight)
+{
+    RefPtr<HTMLPictureElement> picture = adoptRef(new HTMLPictureElement(imgTag, document));
+    if (optionalWidth)
+        picture->setWidth(*optionalWidth);
+    if (optionalHeight)
+        picture->setHeight(*optionalHeight);
+    return picture.release();
+}
+
+const Element* HTMLPictureElement::getMatchingSource() const
+{
+    if (!m_hasSrc) {
+        NodeVector potentialSourceNodes;
+        getChildNodes(this, potentialSourceNodes);
+        for (NodeVector::iterator it = potentialSourceNodes.begin();
+            it != potentialSourceNodes.end();
+            it++) {
+            RefPtr<Node> nodePtr = *it;
+            Node* node = nodePtr.get();
+            if (node && (node->hasTagName(sourceTag)) && (node->parentNode() == this)) {
+                HTMLSourceElement* source = static_cast<HTMLSourceElement*>(node);
+                Document* document = documentInternal();
+                if (source->fastHasAttribute(srcAttr)) {
+                    if (!source->fastHasAttribute(mediaAttr))
+                        return source;
+                    RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::createAllowingDescriptionSyntax(source->media());
+                    RefPtr<RenderStyle> documentStyle = StyleResolver::styleForDocument(document, 0);
+                    MediaQueryEvaluator mediaQueryEvaluator("screen", document->frame(), documentStyle.get());
+                    if (mediaQueryEvaluator.eval(mediaQueries.get()))
+                        return source;
+                }
+            }   
+        }   
+    }
+    return this;
+}
+
+void HTMLPictureElement::sourceWasAdded()
+{
+    updateResources();
+}
+
+void HTMLPictureElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
+{
+    if (name == srcAttr)
+        m_hasSrc = true;
+
+    HTMLImageElement::parseAttribute(name, value);
+}
+
+}
+#endif