Avoid drawing SVG image content when the image is of zero size.

Source/core/rendering/svg/RenderSVGImage.cpp

 /*
  * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 112 matching lines @@
 }
 
 void RenderSVGImage::paint(PaintInfo& paintInfo, const LayoutPoint&)
 {
     ANNOTATE_GRAPHICS_CONTEXT(paintInfo, this);
 
     if (paintInfo.context->paintingDisabled() || style()->visibility() == HIDDEN || !m_imageResource->hasImage())
         return;
 
     FloatRect boundingBox = repaintRectInLocalCoordinates();
     if (!SVGRenderSupport::paintInfoIntersectsRepaintRect(boundingBox, m_localTransform, paintInfo))

[pdr., 2014/01/06 18:24:03]

Can you move the bounding box empty check into this
paintInfoIntersectsRepaintRect function?

         return;
 
     PaintInfo childPaintInfo(paintInfo);
     bool drawsOutline = style()->outlineWidth() && (childPaintInfo.phase == PaintPhaseOutline || childPaintInfo.phase == PaintPhaseSelfOutline);
     if (drawsOutline || childPaintInfo.phase == PaintPhaseForeground) {
         GraphicsContextStateSaver stateSaver(*childPaintInfo.context);
         childPaintInfo.applyTransform(m_localTransform);
 
-        if (childPaintInfo.phase == PaintPhaseForeground) {
+        if (childPaintInfo.phase == PaintPhaseForeground && !m_objectBoundingBox.isEmpty()) {
             SVGRenderingContext renderingContext(this, childPaintInfo);
 
             if (renderingContext.isRenderingPrepared()) {
-                if (style()->svgStyle()->bufferedRendering() == BR_STATIC  && renderingContext.bufferForeground(m_bufferedForeground))
+                if (style()->svgStyle()->bufferedRendering() == BR_STATIC && renderingContext.bufferForeground(m_bufferedForeground))
                     return;
 
                 paintForeground(childPaintInfo);
             }
         }
 
         if (drawsOutline)
             paintOutline(childPaintInfo, IntRect(boundingBox));
     }
 }
@@ skipping 66 matching lines @@
 
 void RenderSVGImage::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint&, const RenderLayerModelObject*)
 {
     // this is called from paint() after the localTransform has already been applied
     IntRect contentRect = enclosingIntRect(repaintRectInLocalCoordinates());
     if (!contentRect.isEmpty())
         rects.append(contentRect);
 }
 
 } // namespace WebCore