Bug 1396025 - Write a comment to explain the difference between eBBoxIncludeFill/eBBoxIncludeStroke and eBBoxIncludeFillGeometry/eBBoxIncludeStrokeGeometry. r=jwatt

MozReview-Commit-ID: LD7uMh3D8vs

--HG--
extra : rebase_source : 7bc67938076547e712c57257d70ba217c8e7920c

layout/svg/nsSVGUtils.h

@@ -389,8 +389,12 @@ public:
 
   enum BBoxFlags {
     eBBoxIncludeFill           = 1 << 0,
+    // Include the geometry of the fill even when the fill does not
+    // actually render (e.g. when fill="none" or fill-opacity="0")
     eBBoxIncludeFillGeometry   = 1 << 1,
     eBBoxIncludeStroke         = 1 << 2,
+    // Include the geometry of the stroke even when the stroke does not
+    // actually render (e.g. when stroke="none" or stroke-opacity="0")
     eBBoxIncludeStrokeGeometry = 1 << 3,
     eBBoxIncludeMarkers        = 1 << 4,
     eBBoxIncludeClipped        = 1 << 5,