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

The "zeroPath" and emptystroke GMs capture this issue.

This CL changes the following PDF GMs: emptystroke dashing4
lineclosepath dashing3 zeroPath linepath
complexclip3_complex complexclip3_simple roundrects
degeneratesegments filltypes strokerect pathfill
inverse_paths desk_chalkboard.skp

After this change, all PDF GMs look better (closer to 8888).
The dashing4, emptystroke, and zeroPath GMs still need a lot
of work to make them look right.

BUG=538726

Review URL: https://codereview.chromium.org/1374383004

1 files changed, 5 insertions, 1 deletions

diff --git a/src/pdf/SkPDFUtils.h b/src/pdf/SkPDFUtils.h
index 38f300aacf..0aa05a088a 100644
--- a/src/pdf/SkPDFUtils.h
+++ b/src/pdf/SkPDFUtils.h
@@ -46,7 +46,11 @@ public:
                             SkScalar dstX, SkScalar dstY, SkWStream* content);
     static void AppendRectangle(const SkRect& rect, SkWStream* content);
     static void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
-                         SkWStream* content);
+                         bool doConsumeDegerates, SkWStream* content);
+    static void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
+                         SkWStream* content) {
+        SkPDFUtils::EmitPath(path, paintStyle, true, content);
+    }
     static void ClosePath(SkWStream* content);
     static void PaintPath(SkPaint::Style style, SkPath::FillType fill,
                           SkWStream* content);