Bug 984761 - Allow setting the primitive type of FilterPrimitiveDescriptions after construction. r=roc

gfx/src/FilterSupport.cpp

@@ -1535,6 +1535,13 @@ FilterSupport::ComputeSourceNeededRegions(const FilterDescription& aFilter,
 
 // FilterPrimitiveDescription
 
+FilterPrimitiveDescription::FilterPrimitiveDescription()
+ : mType(PrimitiveType::Empty)
+ , mOutputColorSpace(ColorSpace::SRGB)
+ , mIsTainted(false)
+{
+}
+
 FilterPrimitiveDescription::FilterPrimitiveDescription(PrimitiveType aType)
  : mType(aType)
  , mOutputColorSpace(ColorSpace::SRGB)

gfx/src/FilterSupport.h

@@ -288,11 +288,13 @@ public:
     kPrimitiveIndexStrokePaint = -4
   };
 
+  FilterPrimitiveDescription();
   FilterPrimitiveDescription(PrimitiveType aType);
   FilterPrimitiveDescription(const FilterPrimitiveDescription& aOther);
   FilterPrimitiveDescription& operator=(const FilterPrimitiveDescription& aOther);
 
   PrimitiveType Type() const { return mType; }
+  void SetType(PrimitiveType aType) { mType = aType; }
   const AttributeMap& Attributes() const { return mAttributes; }
   AttributeMap& Attributes() { return mAttributes; }