Mike Reed | 4c79ecf | 2018-01-04 17:05:11 -0500 | [diff] [blame^] | 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 | |