Bug 1093327 - Correct marker orientation of polygon and polylines. r=cam

dom/svg/nsSVGPolyElement.cpp

@@ -105,7 +105,7 @@ nsSVGPolyElement::GetMarkPoints(nsTArray<nsSVGMark> *aMarks)
     if (i == 1) {
       aMarks->ElementAt(0).angle = angle;
     } else {
-      aMarks->ElementAt(aMarks->Length() - 2).angle =
+      aMarks->ElementAt(aMarks->Length() - 1).angle =
         SVGContentUtils::AngleBisect(prevAngle, angle);
     }
 

layout/reftests/svg/marker-orientation-03.svg

@@ -0,0 +1,15 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <marker id="startMarker" markerUnits="userSpaceOnUse" orient="auto" markerWidth="30" markerHeight="45" refX="15" refY="22.5">
+      <rect fill="red" x="0.5" y="0.5" width="29" height="44"/>
+    </marker>
+  </defs>
+  <rect width="100%" height="100%" fill="lime"/>
+  <polyline fill="none" marker-start="url(#startMarker)" points="190 40 220 40 310 190 340 190"/>
+  <rect x="175" y="18" width="30" height="45" fill="lime" />
+
+</svg>

layout/reftests/svg/reftest.list

@@ -200,6 +200,7 @@ fuzzy-if(cocoaWidget,15,19679) fuzzy-if(winWidget,1,8800) fuzzy-if(!cocoaWidget&
 == marker-viewBox-01.svg marker-viewBox-01-ref.svg
 == marker-orientation-01.svg marker-orientation-01-ref.svg
 pref(svg.marker-improvements.enabled,true) == marker-orientation-02.svg marker-orientation-02-ref.svg
+== marker-orientation-03.svg pass.svg
 == mask-basic-01.svg pass.svg
 == mask-basic-02.svg mask-basic-02-ref.svg
 == mask-basic-03.svg pass.svg