experiment with zero-length round capped line segments

src/core/SkPathMeasure.cpp

 
 /*
  * Copyright 2008 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 "SkPathMeasure.h"
@@ skipping 296 matching lines @@
     }
 }
 
 static void seg_to(const SkPoint pts[], int segType,
                    SkScalar startT, SkScalar stopT, SkPath* dst) {
     SkASSERT(startT >= 0 && startT <= SK_Scalar1);
     SkASSERT(stopT >= 0 && stopT <= SK_Scalar1);
     SkASSERT(startT <= stopT);
 
     if (startT == stopT) {
-        return; // should we report this, to undo a moveTo?
+        /* 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;
     }
 
     SkPoint tmp0[7], tmp1[7];
 
     switch (segType) {
         case kLine_SegType:
             if (SK_Scalar1 == stopT) {
                 dst->lineTo(pts[1]);
             } else {
                 dst->lineTo(SkScalarInterp(pts[0].fX, pts[1].fX, stopT),
@@ skipping 233 matching lines @@
     SkASSERT(dst);
 
     SkScalar length = this->getLength();    // ensure we have built our segments
 
     if (startD < 0) {
         startD = 0;
     }
     if (stopD > length) {
         stopD = length;
     }
-    if (startD >= stopD) {
+    if (startD > stopD) {
         return false;
     }
 
     SkPoint  p;
     SkScalar startT, stopT;
     const Segment* seg = this->distanceToSegment(startD, &startT);
     const Segment* stopSeg = this->distanceToSegment(stopD, &stopT);
     SkASSERT(seg <= stopSeg);
 
     if (startWithMoveTo) {
@@ skipping 37 matching lines @@
 
     for (int i = 0; i < fSegments.count(); i++) {
         const Segment* seg = &fSegments[i];
         SkDebugf("pathmeas: seg[%d] distance=%g, point=%d, t=%g, type=%d\n",
                 i, seg->fDistance, seg->fPtIndex, seg->getScalarT(),
                  seg->fType);
     }
 }
 
 #endif