Ignore zero-length joins

gm/strokes.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkPath.h"
 #include "SkRandom.h"
@@ skipping 192 matching lines @@
     path.cubicTo(-3500,5500,-500,5500,2500,-6500);
     canvas->drawPath(path, p);
     p.setStrokeWidth(1.0721f);
     canvas->translate(10, 10);
     canvas->drawPath(path, p);
     p.setStrokeWidth(1.0722f);
     canvas->translate(10, 10);
     canvas->drawPath(path, p);
 }
 
+DEF_SIMPLE_GM(zerolinestroke, canvas, 90, 120) {
+    SkPaint paint;
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setStrokeWidth(20);
+    paint.setAntiAlias(true);
+    paint.setStrokeCap(SkPaint::kRound_Cap);
+
+    SkPath path;
+    path.moveTo(30, 90);
+    path.lineTo(30, 90);
+    path.lineTo(60, 90);
+    path.lineTo(60, 90);
+    canvas->drawPath(path, paint);
+
+    path.reset();
+    path.moveTo(30, 30);
+    path.lineTo(60, 30);
+    canvas->drawPath(path, paint);
+
+    path.reset();
+    path.moveTo(30, 60);
+    path.lineTo(30, 60);
+    path.lineTo(60, 60);
+    canvas->drawPath(path, paint);
+}
+
 class Strokes2GM : public skiagm::GM {
     SkPath fPath;
 protected:
     void onOnceBeforeDraw() override {
         SkRandom rand;
         fPath.moveTo(0, 0);
         for (int i = 0; i < 13; i++) {
             SkScalar x = rand.nextUScalar1() * (W >> 1);
             SkScalar y = rand.nextUScalar1() * (H >> 1);
             fPath.lineTo(x, y);
@@ skipping 241 matching lines @@
 static skiagm::GM* F4(void*) { return new Strokes5GM; }
 
 static skiagm::GMRegistry R0(F0);
 static skiagm::GMRegistry R1(F1);
 static skiagm::GMRegistry R2(F2);
 static skiagm::GMRegistry R3(F3);
 static skiagm::GMRegistry R4(F4);
 
 DEF_GM( return new ZeroLenStrokesGM; )
 DEF_GM( return new TeenyStrokesGM; )