need to clamp all of the cubic points after a chop, in case our finite precision

src/core/SkEdgeClipper.cpp

 
 /*
  * Copyright 2009 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkEdgeClipper.h"
@@ skipping 270 matching lines @@
         SkScalar t;
         if (chopMonoCubicAtY(pts, clip.fTop, &t)) {
             SkPoint tmp[7];
             SkChopCubicAt(pts, tmp, t);
 
             // tmp[3, 4].fY should all be to the below clip.fTop, and
             // still be monotonic in Y. Since we can't trust the numerics of
             // the chopper, we force those conditions now
             tmp[3].fY = clip.fTop;
             clamp_ge(tmp[4].fY, clip.fTop);
+            clamp_ge(tmp[5].fY, tmp[4].fY);

[caryclark, 2013/05/08 21:07:35]

update the comment above?

[reed1, 2013/05/08 21:08:03]

Done.

 
             pts[0] = tmp[3];
             pts[1] = tmp[4];
             pts[2] = tmp[5];
         } else {
             // if chopMonoCubicAtY failed, then we may have hit inexact numerics
             // so we just clamp against the top
             for (int i = 0; i < 4; i++) {
                 clamp_ge(pts[i].fY, clip.fTop);
             }
@@ skipping 223 matching lines @@
         assert_monotonic(&pts[0].fY, count);
     }
 }
 
 void sk_assert_monotonic_x(const SkPoint pts[], int count) {
     if (count > 1) {
         assert_monotonic(&pts[0].fX, count);
     }
 }
 #endif