add caps for hairline moveTo / close

src/core/SkScan_Hairline.cpp

 /*
  * Copyright 2006 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 "SkScan.h"
 #include "SkBlitter.h"
 #include "SkRasterClip.h"
@@ skipping 453 matching lines @@
             case SkPath::kCubic_Verb: {
                 if (SkPaint::kButt_Cap != capStyle) {
                     extend_pts<capStyle>(prevVerb, iter.peek(), pts, 4);
                 }
                 haircubic(pts, clip, blitter, kMaxCubicSubdivideLevel, lineproc);
                 lastPt = pts[3];
             } break;
             case SkPath::kClose_Verb:
                 pts[0] = lastPt;
                 pts[1] = firstPt;
+                if (SkPaint::kButt_Cap != capStyle && prevVerb == SkPath::kMove_Verb) {
+                    // cap moveTo/close to match svg expectations for degenerate segments
+                    extend_pts<capStyle>(prevVerb, iter.peek(), pts, 2);
+                }
                 lineproc(pts, 2, clip, blitter);
                 break;
             case SkPath::kDone_Verb:
                 break;
         }
         if (SkPaint::kButt_Cap != capStyle) {
             prevVerb = verb;
         }
     }
 }
@@ skipping 92 matching lines @@
 
         SkAAClipBlitterWrapper wrap;
         if (!clip.quickContains(r.roundOut().makeOutset(1, 1))) {
             wrap.init(clip, blitter);
             blitter = wrap.getBlitter();
             clipRgn = &wrap.getRgn();
         }
         AntiHairLineRgn(pts, count, clipRgn, blitter);
     }
 }