Use srcset's resource pixel density to determine intrinsic size

Source/core/rendering/RenderImageResource.cpp

 /*
  * Copyright (C) 1999 Lars Knoll <knoll@kde.org>
  * Copyright (C) 1999 Antti Koivisto <koivisto@kde.org>
  * Copyright (C) 2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2006 Allan Sandfeld Jensen <kde@carewolf.com>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
@@ skipping 12 matching lines @@
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/rendering/RenderImageResource.h"
 
 #include "core/fetch/ImageResource.h"
 #include "core/platform/graphics/Image.h"
+#include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderObject.h"
 
 namespace WebCore {
 
 RenderImageResource::RenderImageResource()
     : m_renderer(0)
     , m_cachedImage(0)
 {
 }
 
@@ skipping 53 matching lines @@
     ASSERT(m_renderer);
     if (m_cachedImage)
         m_cachedImage->setContainerSizeForRenderer(m_renderer, imageContainerSize, m_renderer->style()->effectiveZoom());
 }
 
 Image* RenderImageResource::nullImage()
 {
     return Image::nullImage();
 }
 
+LayoutSize RenderImageResource::getImageSize(float multiplier, ImageResource::SizeType type) const
+{
+    if (!m_cachedImage)
+        return LayoutSize();
+    LayoutSize size = m_cachedImage->imageSizeForRenderer(m_renderer, multiplier, type);
+    if (m_renderer && m_renderer->isRenderImage())
+        size.scale(toRenderImage(m_renderer)->imageDevicePixelRatio());
+    return size;
+}
+
 } // namespace WebCore