add conics to path ops

src/pathops/SkPathWriter.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkPathOpsPoint.h"
 #include "SkPathWriter.h"
 
 // wrap path to keep track of whether the contour is initialized and non-empty
@@ skipping 17 matching lines @@
     if (callClose) {
 #if DEBUG_PATH_CONSTRUCTION
         SkDebugf("path.close();\n");
 #endif
         fPathPtr->close();
         fCloses++;
     }
     init();
 }
 
+void SkPathWriter::conicTo(const SkPoint& pt1, const SkPoint& pt2, SkScalar weight) {
+    lineTo();
+    if (fEmpty && AlmostEqualUlps(fDefer[0], pt1) && AlmostEqualUlps(pt1, pt2)) {
+        deferredLine(pt2);
+        return;
+    }
+    moveTo();
+    fDefer[1] = pt2;
+    nudge();
+    fDefer[0] = fDefer[1];
+#if DEBUG_PATH_CONSTRUCTION
+    SkDebugf("path.conicTo(%1.9g,%1.9g, %1.9g,%1.9g, %1.9g);\n",
+            pt1.fX, pt1.fY, fDefer[1].fX, fDefer[1].fY, weight);
+#endif
+    fPathPtr->conicTo(pt1.fX, pt1.fY, fDefer[1].fX, fDefer[1].fY, weight);
+    fEmpty = false;
+}
+
 void SkPathWriter::cubicTo(const SkPoint& pt1, const SkPoint& pt2, const SkPoint& pt3) {
     lineTo();
     if (fEmpty && AlmostEqualUlps(fDefer[0], pt1) && AlmostEqualUlps(pt1, pt2)
             && AlmostEqualUlps(pt2, pt3)) {
         deferredLine(pt3);
         return;
     }
     moveTo();
     fDefer[1] = pt3;
     nudge();
@@ skipping 109 matching lines @@
         return;
     }
     fFirstPt = fDefer[0];
 #if DEBUG_PATH_CONSTRUCTION
     SkDebugf("path.moveTo(%1.9g,%1.9g);\n", fDefer[0].fX, fDefer[0].fY);
 #endif
     fPathPtr->moveTo(fDefer[0].fX, fDefer[0].fY);
     fMoved = false;
     fMoves++;
 }