Add an SkPath conic conversion utility.

Expose SkConic::chopIntoQuadsPOW2() as SkPath::ConvertConicToQuads().

BUG=chromium:315277
R=reed@google.com

Review URL: https://codereview.chromium.org/1484373002

2 files changed, 13 insertions, 0 deletions

diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index 3c68ff7d84..33db8ac249 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -540,6 +540,13 @@ public:
     }
 
     /**
+     *  Chop a conic into N quads, stored continguously in pts[], where
+     *  N = 1 << pow2. The amount of storage needed is (1 + 2 * N)
+     */
+    static int ConvertConicToQuads(const SkPoint& p0, const SkPoint& p1, const SkPoint& p2,
+                                   SkScalar w, SkPoint pts[], int pow2);
+
+    /**
      *  Returns true if the path specifies a rectangle.
      *
      *  If this returns false, then all output parameters are ignored, and left
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 2d4976a82a..351629d125 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -2837,3 +2837,9 @@ bool SkPath::contains(SkScalar x, SkScalar y) const {
     }
     return SkToBool(w);
 }
+
+int SkPath::ConvertConicToQuads(const SkPoint& p0, const SkPoint& p1, const SkPoint& p2,
+                                SkScalar w, SkPoint pts[], int pow2) {
+    const SkConic conic(p0, p1, p2, w);
+    return conic.chopIntoQuadsPOW2(pts, pow2);
+}