add conics to path ops

src/pathops/SkConicLineIntersection.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkIntersections.h"
+#include "SkPathOpsConic.h"
+#include "SkPathOpsLine.h"
+
+class LineConicIntersections {
+public:
+    LineConicIntersections(const SkDConic& c, const SkDLine& l, SkIntersections* i)
+        : fConic(c)
+        , fLine(l)
+        , fIntersections(i)
+        , fAllowNear(true) {
+        i->setMax(3);  // allow short partial coincidence plus discrete intersection
+    }
+
+    void allowNear(bool allow) {
+        fAllowNear = allow;
+    }
+
+    int intersectRay(double roots[2]) {
+        return 0;
+    }
+};
+
+int SkIntersections::intersectRay(const SkDConic& conic, const SkDLine& line) {
+    LineConicIntersections c(conic, line, this);
+    fUsed = c.intersectRay(fT[0]);
+    for (int index = 0; index < fUsed; ++index) {
+        fPt[index] = conic.ptAtT(fT[0][index]);
+    }
+    return fUsed;
+}