path ops near exact

src/pathops/SkPathOpsTypes.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpsTypes_DEFINED
 #define SkPathOpsTypes_DEFINED
 
 #include <float.h>  // for FLT_EPSILON
@@ skipping 15 matching lines @@
 bool AlmostEqualUlps(float A, float B);
 inline bool AlmostEqualUlps(double A, double B) {
     return AlmostEqualUlps(SkDoubleToScalar(A), SkDoubleToScalar(B));
 }
 
 bool RoughlyEqualUlps(float A, float B);
 inline bool RoughlyEqualUlps(double A, double B) {
     return RoughlyEqualUlps(SkDoubleToScalar(A), SkDoubleToScalar(B));
 }
 
+bool AlmostBetweenUlps(float a, float b, float c);
+inline bool AlmostBetweenUlps(double A, double B, double C) {
+    return AlmostBetweenUlps(SkDoubleToScalar(A), SkDoubleToScalar(B), SkDoubleToScalar(C));
+}
+
 // FLT_EPSILON == 1.19209290E-07 == 1 / (2 ^ 23)
 // DBL_EPSILON == 2.22045e-16
 const double FLT_EPSILON_CUBED = FLT_EPSILON * FLT_EPSILON * FLT_EPSILON;
 const double FLT_EPSILON_HALF = FLT_EPSILON / 2;
 const double FLT_EPSILON_DOUBLE = FLT_EPSILON * 2;
 const double FLT_EPSILON_SQUARED = FLT_EPSILON * FLT_EPSILON;
 const double FLT_EPSILON_SQRT = sqrt(FLT_EPSILON);
 const double FLT_EPSILON_INVERSE = 1 / FLT_EPSILON;
 const double DBL_EPSILON_ERR = DBL_EPSILON * 4;  // FIXME: tune -- allow a few bits of error
 const double DBL_EPSILON_SUBDIVIDE_ERR = DBL_EPSILON * 16;
@@ skipping 207 matching lines @@
 inline int SKDSide(double x) {
     return (x > 0) + (x >= 0);
 }
 
 /* Returns 1 if negative, 2 if zero, 4 if positive
 */
 inline int SkDSideBit(double x) {
     return 1 << SKDSide(x);
 }
 
+inline double SkPinT(double t) {
+    return precisely_less_than_zero(t) ? 0 : precisely_greater_than_one(t) ? 1 : t;
+}
+
 #endif