allow move/zero-line/close to draw caps

src/core/SkPath.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 "SkBuffer.h"
 #include "SkCubicClipper.h"
 #include "SkErrorInternals.h"
@@ skipping 1166 matching lines @@
             *verbs == kQuad_Verb ||
             *verbs == kConic_Verb ||
             *verbs == kCubic_Verb) {
             return false;
         }
         ++verbs;
     }
     return true;
 }
 
+bool SkPath::isZeroLength() const {
+    int count = fPathRef->countPoints();
+    if (count < 2) {
+        return true;
+    }
+    const SkPoint* pts = fPathRef.get()->points();
+    const SkPoint& first = *pts;
+    for (int index = 1; index < count; ++index) {
+        if (first != pts[index]) {
+            return false;
+        }
+    }
+    return true;
+}
+
 void SkPath::addRoundRect(const SkRect& rect, SkScalar rx, SkScalar ry,
                           Direction dir) {
     assert_known_direction(dir);
 
     if (rx < 0 || ry < 0) {
         SkErrorInternals::SetError( kInvalidArgument_SkError,
                                     "I got %f and %f as radii to SkPath::AddRoundRect, "
                                     "but negative radii are not allowed.",
                                     SkScalarToDouble(rx), SkScalarToDouble(ry) );
         return;
@@ skipping 2013 matching lines @@
         }
     } while (!done);
     return SkToBool(tangents.count()) ^ isInverse;
 }
 
 int SkPath::ConvertConicToQuads(const SkPoint& p0, const SkPoint& p1, const SkPoint& p2,
                                 SkScalar w, SkPoint pts[], int pow2) {
     const SkConic conic(p0, p1, p2, w);
     return conic.chopIntoQuadsPOW2(pts, pow2);
 }