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

include/core/SkScalar.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkScalar_DEFINED
 #define SkScalar_DEFINED
 
@@ skipping 210 matching lines @@
     SkASSERT(tolerance >= 0);
     return SkScalarAbs(x) <= tolerance;
 }
 
 static inline bool SkScalarNearlyEqual(SkScalar x, SkScalar y,
                                        SkScalar tolerance = SK_ScalarNearlyZero) {
     SkASSERT(tolerance >= 0);
     return SkScalarAbs(x-y) <= tolerance;
 }
 
+static inline SkScalar SkScalarNormalize(SkScalar x)

[reed1, 2016/08/26 17:49:43]

Given this name, should it trigger only when x is denormalized?
SkScalarNearlyZero is some made up value, mostly not related to denormalized
issues.

+{
+    return SkScalarNearlyZero(x) ? 0 : x;
+}
+
 /** Linearly interpolate between A and B, based on t.
     If t is 0, return A
     If t is 1, return B
     else interpolate.
     t must be [0..SK_Scalar1]
 */
 static inline SkScalar SkScalarInterp(SkScalar A, SkScalar B, SkScalar t) {
     SkASSERT(t >= 0 && t <= SK_Scalar1);
     return A + (B - A) * t;
 }
@@ skipping 18 matching lines @@
     SkASSERT(n >= 0);
     for (int i = 0; i < n; ++i) {
         if (a[i] != b[i]) {
             return false;
         }
     }
     return true;
 }
 
 #endif