convert pathops to use SkSTArray where possible.

src/pathops/SkPathOpsCubic.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkLineParameters.h"
 #include "SkPathOpsCubic.h"
 #include "SkPathOpsLine.h"
 #include "SkPathOpsQuad.h"
@@ skipping 365 matching lines @@
     double ab = SkDInterp(src[0], src[2], t);
     double bc = SkDInterp(src[2], src[4], t);
     double cd = SkDInterp(src[4], src[6], t);
     double abc = SkDInterp(ab, bc, t);
     double bcd = SkDInterp(bc, cd, t);
     double abcd = SkDInterp(abc, bcd, t);
     return abcd;
 }
 
 SkDCubic SkDCubic::subDivide(double t1, double t2) const {
-    if (t1 == 0 && t2 == 1) {
-        return *this;
+    if (t1 == 0 || t2 == 1) {
+        if (t1 == 0 && t2 == 1) {
+            return *this;
+        }
+        SkDCubicPair pair = chopAt(t1 == 0 ? t2 : t1);
+        SkDCubic dst = t1 == 0 ? pair.first() : pair.second();
+        return dst;
     }
     SkDCubic dst;
     double ax = dst[0].fX = interp_cubic_coords(&fPts[0].fX, t1);
     double ay = dst[0].fY = interp_cubic_coords(&fPts[0].fY, t1);
     double ex = interp_cubic_coords(&fPts[0].fX, (t1*2+t2)/3);
     double ey = interp_cubic_coords(&fPts[0].fY, (t1*2+t2)/3);
     double fx = interp_cubic_coords(&fPts[0].fX, (t1+t2*2)/3);
     double fy = interp_cubic_coords(&fPts[0].fY, (t1+t2*2)/3);
     double dx = dst[3].fX = interp_cubic_coords(&fPts[0].fX, t2);
     double dy = dst[3].fY = interp_cubic_coords(&fPts[0].fY, t2);
@@ skipping 92 matching lines @@
         dst.pts[4].fY = (fPts[1].fY + 2 * fPts[2].fY + fPts[3].fY) / 4;
         dst.pts[5].fX = (fPts[2].fX + fPts[3].fX) / 2;
         dst.pts[5].fY = (fPts[2].fY + fPts[3].fY) / 2;
         dst.pts[6] = fPts[3];
         return dst;
     }
     interp_cubic_coords(&fPts[0].fX, &dst.pts[0].fX, t);
     interp_cubic_coords(&fPts[0].fY, &dst.pts[0].fY, t);
     return dst;
 }