Fix loopIndex in chopCubicAtLoopIntersection

A recent change broke the case where the entire bezier is inside the
loop segment.

Bug: skia:4410
Change-Id: Ib534d459eaa4461d6760e894a8826e3019584ee8
Reviewed-on: https://skia-review.googlesource.com/19333
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/src/gpu/GrPathUtils.cpp b/src/gpu/GrPathUtils.cpp
index d5a237c361..022d2c63ad 100644
--- a/src/gpu/GrPathUtils.cpp
+++ b/src/gpu/GrPathUtils.cpp
@@ -837,13 +837,16 @@ int GrPathUtils::chopCubicAtLoopIntersection(const SkPoint src[4], SkPoint dst[1
         t[1] /= s[1];
         SkASSERT(t[0] <= t[1]); // Technically t0 != t1 in a loop, but there may be FP error.
 
-        if (t[0] > 0 && t[0] < 1) {
-            chops.push_back(t[0]);
-            *loopIndex = 1;
-        }
-        if (t[1] > 0 && t[1] < 1) {
-            chops.push_back(t[1]);
-            *loopIndex = chops.count() - 1;
+        if (t[0] < 1 && t[1] > 0) {
+            *loopIndex = 0;
+            if (t[0] > 0) {
+                chops.push_back(t[0]);
+                *loopIndex = 1;
+            }
+            if (t[1] < 1) {
+                chops.push_back(t[1]);
+                *loopIndex = chops.count() - 1;
+            }
         }
     }