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      1 /*
      2  * Copyright 2018 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkCubicMap_DEFINED
      9 #define SkCubicMap_DEFINED
     10 
     11 #include "SkPoint.h"
     12 
     13 class SkCubicMap {
     14 public:
     15     void setPts(SkPoint p1, SkPoint p2);
     16     void setPts(float x1, float y1, float x2, float y2) {
     17         this->setPts({x1, y1}, {x2, y2});
     18     }
     19 
     20     SkPoint computeFromT(float t) const;
     21     float computeYFromX(float x) const;
     22 
     23     // experimental
     24     float hackYFromX(float x) const;
     25 
     26 private:
     27     SkPoint fCoeff[4];
     28     // x->t lookup
     29     enum { kTableCount = 16 };
     30     struct Rec {
     31         float   fT0;
     32         float   fDT;
     33 
     34         float fY0;
     35         float fDY;
     36     };
     37     Rec fXTable[kTableCount];
     38 
     39     void buildXTable();
     40 };
     41 #endif
     42 
     43