break out of cubic stroker loop on degenerate case

gm/dashcubics.cpp

 /*
  * Copyright 2012 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 "SkCanvas.h"
 #include "SkPath.h"
 #include "SkParsePath.h"
 #include "SkDashPathEffect.h"
 
 /*
  *  Inspired by http://code.google.com/p/chromium/issues/detail?id=112145
  */
 
 class DashCubicsGM : public skiagm::GM {
 public:
     DashCubicsGM() {}
 
 protected:
 
     virtual SkString onShortName() {
         return SkString("dashcubics");
     }
 
     virtual SkISize onISize() {
-        return SkISize::Make(640, 480);
+        return SkISize::Make(860, 700);
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
-        SkPath path;
-        const char* d = "M 337,98 C 250,141 250,212 250,212 C 250,212 250,212 250,212"
-        "C 250,212 250,212 250,212 C 250,212 250,141 163,98 C 156,195 217,231 217,231"
-        "C 217,231 217,231 217,231 C 217,231 217,231 217,231 C 217,231 156,195 75,250"
-        "C 156,305 217,269 217,269 C 217,269 217,269 217,269 C 217,269 217,269 217,269"
-        "C 217,269 156,305 163,402 C 250,359 250,288 250,288 C 250,288 250,288 250,288"
-        "C 250,288 250,288 250,288 C 250,288 250,359 338,402 C 345,305 283,269 283,269"
-        "C 283,269 283,269 283,269 C 283,269 283,269 283,269 C 283,269 345,305 425,250"
-        "C 344,195 283,231 283,231 C 283,231 283,231 283,231 C 283,231 283,231 283,231"
-        "C 283,231 344,195 338,98";
-
-        SkParsePath::FromSVGString(d, &path);
-
-        SkScalar intervals[] = { 5, 10 };
+    void flower(SkCanvas* canvas, const SkPath& path, SkScalar intervals[2], SkPaint::Join join) {
         SkPathEffect* pe = SkDashPathEffect::Create(intervals, 2, 0);
 
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setStyle(SkPaint::kStroke_Style);
-
+        paint.setStrokeJoin(join);
         paint.setStrokeWidth(42);
         canvas->drawPath(path, paint);
 
         paint.setColor(SK_ColorRED);
         paint.setStrokeWidth(21);
         paint.setPathEffect(pe)->unref();
         canvas->drawPath(path, paint);
 
         paint.setColor(SK_ColorGREEN);
         paint.setPathEffect(NULL);
         paint.setStrokeWidth(0);
         canvas->drawPath(path, paint);
     }
 
+    virtual void onDraw(SkCanvas* canvas) {
+        SkPath path;
+        const char* d = "M 337,98 C 250,141 250,212 250,212 C 250,212 250,212 250,212"
+        "C 250,212 250,212 250,212 C 250,212 250,141 163,98 C 156,195 217,231 217,231"
+        "C 217,231 217,231 217,231 C 217,231 217,231 217,231 C 217,231 156,195 75,250"
+        "C 156,305 217,269 217,269 C 217,269 217,269 217,269 C 217,269 217,269 217,269"
+        "C 217,269 156,305 163,402 C 250,359 250,288 250,288 C 250,288 250,288 250,288"
+        "C 250,288 250,288 250,288 C 250,288 250,359 338,402 C 345,305 283,269 283,269"
+        "C 283,269 283,269 283,269 C 283,269 283,269 283,269 C 283,269 345,305 425,250"
+        "C 344,195 283,231 283,231 C 283,231 283,231 283,231 C 283,231 283,231 283,231"
+        "C 283,231 344,195 338,98";
+
+        SkParsePath::FromSVGString(d, &path);
+            canvas->translate(-35.f, -55.f);
+        for (int x = 0; x < 2; ++x) {
+            for (int y = 0; y < 2; ++y) {
+                canvas->save();
+                canvas->translate(x * 430.f, y * 355.f);
+                SkScalar intervals[] = { 5 + (x ? 0 : 0.0001f + 0.0001f), 10 };
+                flower(canvas, path, intervals, y ? SkPaint::kDefault_Join : SkPaint::kRound_Join);
+                canvas->restore();
+            }
+        }
+    }
+
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new DashCubicsGM; }
 static skiagm::GMRegistry reg(MyFactory);