Don't treat shorthand filters as errors on SVG content

third_party/WebKit/Source/core/paint/SVGPaintContext.cpp

 /*
  * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2009-2010. 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
@@ skipping 134 matching lines @@
 bool SVGPaintContext::applyMaskIfNecessary(SVGResources* resources)
 {
     if (LayoutSVGResourceMasker* masker = resources ? resources->masker() : nullptr) {
         if (!SVGMaskPainter(*masker).prepareEffect(m_object, paintInfo().context))
             return false;
         m_masker = masker;
     }
     return true;
 }
 
+static bool hasReferenceFilterOnly(const ComputedStyle& style)
+{
+    if (!style.hasFilter())
+        return false;
+    const FilterOperations& operations = style.filter();
+    if (operations.size() != 1)
+        return false;
+    return operations.at(0)->type() == FilterOperation::REFERENCE;
+}
+
 bool SVGPaintContext::applyFilterIfNecessary(SVGResources* resources)
 {
-    if (!resources) {
-        if (m_object.style()->hasFilter())
-            return false;
-    } else if (LayoutSVGResourceFilter* filter = resources->filter()) {
-        m_filterRecordingContext = wrapUnique(new SVGFilterRecordingContext(paintInfo().context));
-        m_filter = filter;
-        GraphicsContext* filterContext = SVGFilterPainter(*filter).prepareEffect(m_object, *m_filterRecordingContext);
-        if (!filterContext)
-            return false;
+    if (!resources)
+        return !hasReferenceFilterOnly(m_object.styleRef());
 
-        // Because the filter needs to cache its contents we replace the context
-        // during filtering with the filter's context.
-        m_filterPaintInfo = wrapUnique(new PaintInfo(*filterContext, m_paintInfo));
+    LayoutSVGResourceFilter* filter = resources->filter();
+    if (!filter)
+        return true;
+    m_filterRecordingContext = wrapUnique(new SVGFilterRecordingContext(paintInfo().context));
+    m_filter = filter;
+    GraphicsContext* filterContext = SVGFilterPainter(*filter).prepareEffect(m_object, *m_filterRecordingContext);
+    if (!filterContext)
+        return false;
 
-        // Because we cache the filter contents and do not invalidate on paint
-        // invalidation rect changes, we need to paint the entire filter region
-        // so elements outside the initial paint (due to scrolling, etc) paint.
-        m_filterPaintInfo->m_cullRect.m_rect = LayoutRect::infiniteIntRect();
-    }
+    // Because the filter needs to cache its contents we replace the context
+    // during filtering with the filter's context.
+    m_filterPaintInfo = wrapUnique(new PaintInfo(*filterContext, m_paintInfo));
+
+    // Because we cache the filter contents and do not invalidate on paint
+    // invalidation rect changes, we need to paint the entire filter region
+    // so elements outside the initial paint (due to scrolling, etc) paint.
+    m_filterPaintInfo->m_cullRect.m_rect = LayoutRect::infiniteIntRect();
     return true;
 }
 
 bool SVGPaintContext::isIsolationInstalled() const
 {
     if (m_compositingRecorder)
         return true;
     if (m_masker || m_filter)
         return true;
     if (m_clipper && m_clipperState == SVGClipPainter::ClipperAppliedMask)
@@ skipping 44 matching lines @@
     // though.
     // Additionally, it's not really safe/guaranteed to be correct, as
     // something down the paint pipe may want to farther tweak the color
     // filter, which could yield incorrect results. (Consider just using
     // saveLayer() w/ this color filter explicitly instead.)
     paint.setColorFilter(sk_ref_sp(paintInfo.context.colorFilter()));
     return true;
 }
 
 } // namespace blink