fix strokes for quadratics. #define SK_IGNORE_QUAD_STROKE_FIX to

retain the old behavior (i.e. for skia.gyp until we rebaseline)



git-svn-id: http://skia.googlecode.com/svn/trunk@6937 2bbb7eff-a529-9590-31e7-b0007b416f81

src/core/SkStroke.cpp

@@ -255,9 +255,19 @@ void SkPathStroker::quad_to(const SkPoint pts[3],
         this->quad_to(&tmp[0], normalAB, unitNormalAB, &norm, &unit, subDivide);
         this->quad_to(&tmp[2], norm, unit, normalBC, unitNormalBC, subDivide);
     } else {
-        SkVector    normalB, unitB;
+        SkVector    normalB;
+        
+#ifdef SK_IGNORE_QUAD_STROKE_FIX
+        SkVector unitB;
         SkAssertResult(set_normal_unitnormal(pts[0], pts[2], fRadius,
                                              &normalB, &unitB));
+#else
+        normalB = pts[2] - pts[0];
+        normalB.rotateCCW();
+        SkScalar dot = SkPoint::DotProduct(unitNormalAB, *unitNormalBC);
+        SkAssertResult(normalB.setLength(SkScalarDiv(fRadius,
+                                     SkScalarSqrt((SK_Scalar1 + dot)/2))));
+#endif
 
         fOuter.quadTo(  pts[1].fX + normalB.fX, pts[1].fY + normalB.fY,
                         pts[2].fX + normalBC->fX, pts[2].fY + normalBC->fY);