You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
46 lines
1002 B
46 lines
1002 B
/*
|
|
* Copyright 2018 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkCubicMap_DEFINED
|
|
#define SkCubicMap_DEFINED
|
|
|
|
#include "include/core/SkPoint.h"
|
|
|
|
/**
|
|
* Fast evaluation of a cubic ease-in / ease-out curve. This is defined as a parametric cubic
|
|
* curve inside the unit square.
|
|
*
|
|
* pt[0] is implicitly { 0, 0 }
|
|
* pt[3] is implicitly { 1, 1 }
|
|
* pts[1,2].X are inside the unit [0..1]
|
|
*/
|
|
class SK_API SkCubicMap {
|
|
public:
|
|
SkCubicMap(SkPoint p1, SkPoint p2);
|
|
|
|
static bool IsLinear(SkPoint p1, SkPoint p2) {
|
|
return SkScalarNearlyEqual(p1.fX, p1.fY) && SkScalarNearlyEqual(p2.fX, p2.fY);
|
|
}
|
|
|
|
float computeYFromX(float x) const;
|
|
|
|
SkPoint computeFromT(float t) const;
|
|
|
|
private:
|
|
enum Type {
|
|
kLine_Type, // x == y
|
|
kCubeRoot_Type, // At^3 == x
|
|
kSolver_Type, // general monotonic cubic solver
|
|
};
|
|
|
|
SkPoint fCoeff[3];
|
|
Type fType;
|
|
};
|
|
|
|
#endif
|
|
|