fix fuzz

if built path is empty, don't add a zero-length line
(when start and end of interval are equal)

R=kjlubick@google.com

Docs-Preview: https://skia.org/?cl=114940
Bug: skia:
Change-Id: I018eaec4d31daf3e3820641127b63d047e4ee007
Reviewed-on: https://skia-review.googlesource.com/114940
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Cary Clark <caryclark@skia.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/src/core/SkPathMeasure.cpp b/src/core/SkPathMeasure.cpp
index cdcd164018..df47af5440 100644
--- a/src/core/SkPathMeasure.cpp
+++ b/src/core/SkPathMeasure.cpp
@@ -40,11 +40,13 @@ void SkPathMeasure_segTo(const SkPoint pts[], unsigned segType,
     SkASSERT(startT <= stopT);
 
     if (startT == stopT) {
-        /* if the dash as a zero-length on segment, add a corresponding zero-length line.
-           The stroke code will add end caps to zero length lines as appropriate */
-        SkPoint lastPt;
-        SkAssertResult(dst->getLastPt(&lastPt));
-        dst->lineTo(lastPt);
+        if (!dst->isEmpty()) {
+            /* if the dash as a zero-length on segment, add a corresponding zero-length line.
+               The stroke code will add end caps to zero length lines as appropriate */
+            SkPoint lastPt;
+            SkAssertResult(dst->getLastPt(&lastPt));
+            dst->lineTo(lastPt);
+        }
         return;
     }