SkPDF: when drawing stroked path, draw using SVG rules for zero-length segments

src/pdf/SkPDFDevice.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 "SkPDFDevice.h"
 
 #include "SkAnnotation.h"
@@ skipping 1017 matching lines @@
     if (SkAnnotation* annotation = paint.getAnnotation()) {
         if (handlePathAnnotation(*pathPtr, d, annotation)) {
             return;
         }
     }
 
     ScopedContentEntry content(this, d.fClipStack, *d.fClip, matrix, paint);
     if (!content.entry()) {
         return;
     }
+    bool consumeDegeratePathSegments =
+           paint.getStyle() == SkPaint::kFill_Style ||
+           (paint.getStrokeCap() != SkPaint::kRound_Cap &&
+            paint.getStrokeCap() != SkPaint::kSquare_Cap);
     SkPDFUtils::EmitPath(*pathPtr, paint.getStyle(),
+                         consumeDegeratePathSegments,
                          &content.entry()->fContent);
     SkPDFUtils::PaintPath(paint.getStyle(), pathPtr->getFillType(),
                           &content.entry()->fContent);
 }
 
 void SkPDFDevice::drawBitmapRect(const SkDraw& draw,
                                  const SkBitmap& bitmap,
                                  const SkRect* src,
                                  const SkRect& dst,
                                  const SkPaint& srcPaint,
@@ skipping 1237 matching lines @@
     if (!pdfimage) {
         pdfimage.reset(SkPDFCreateBitmapObject(image));
         if (!pdfimage) {
             return;
         }
         fCanon->addPDFBitmap(image->uniqueID(), pdfimage);
     }
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(pdfimage.get()),
                                 &content.entry()->fContent);
 }