Image filters: force near-zero floating point parameters to zero.

include/core/SkPoint3.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPoint3_DEFINED
 #define SkPoint3_DEFINED
 
@@ skipping 29 matching lines @@
     /** Return the Euclidian distance from (0,0,0) to the point
     */
     SkScalar length() const { return SkPoint3::Length(fX, fY, fZ); }
 
     /** Set the point (vector) to be unit-length in the same direction as it
         already points.  If the point has a degenerate length (i.e., nearly 0)
         then set it to (0,0,0) and return false; otherwise return true.
     */
     bool normalize();
 
+    SkPoint3 makeDenormalsZero() const;
+
     /** Return a new point whose X, Y and Z coordinates are scaled.
     */
     SkPoint3 makeScale(SkScalar scale) const {
         SkPoint3 p;
         p.set(scale * fX, scale * fY, scale * fZ);
         return p;
     }
 
     /** Scale the point's coordinates by scale.
     */
@@ skipping 55 matching lines @@
 
     SkScalar dot(const SkPoint3& vec) const {
         return DotProduct(*this, vec);
     }
 };
 
 typedef SkPoint3 SkVector3;
 typedef SkPoint3 SkColor3f;
 
 #endif