add support for capped hairlines

src/core/SkDraw.cpp

Index: src/core/SkDraw.cpp
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index e1a49d39b4a582265dda15c430ffbf95578bc297..6c7d38aee9eac9ae80110b13a2f4e0123e1ba969 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -1132,9 +1132,41 @@ void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
         }
     } else {    // hairline
         if (paint->isAntiAlias()) {
+            switch (paint->getStrokeCap()) {
+                case SkPaint::kButt_Cap:
+                    proc = SkScan::AntiHairPath;
+                    break;
+                case SkPaint::kSquare_Cap:
+                    proc = SkScan::AntiHairSquarePath;
+                    break;
+                case SkPaint::kRound_Cap:
+                    proc = SkScan::AntiHairRoundPath;
+                    break;
+                default:
+                    proc SK_INIT_TO_AVOID_WARNING;
+                    SkDEBUGFAIL("unknown paint cap type");
+            }
+#ifdef SK_SUPPORT_LEGACY_HAIR_IGNORES_CAPS
             proc = SkScan::AntiHairPath;
+#endif
         } else {
+            switch (paint->getStrokeCap()) {
+                case SkPaint::kButt_Cap:
+                    proc = SkScan::HairPath;
+                    break;
+                case SkPaint::kSquare_Cap:
+                    proc = SkScan::HairSquarePath;
+                    break;
+                case SkPaint::kRound_Cap:
+                    proc = SkScan::HairRoundPath;
+                    break;
+                default:
+                    proc SK_INIT_TO_AVOID_WARNING;
+                    SkDEBUGFAIL("unknown paint cap type");
+            }
+#ifdef SK_SUPPORT_LEGACY_HAIR_IGNORES_CAPS
             proc = SkScan::HairPath;
+#endif
         }
     }
     proc(*devPathPtr, *fRC, blitter);