/usr/include/thunderbird/nsSMILKeySpline.h is in thunderbird-dev 1:38.6.0+build1-0ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef NS_SMILKEYSPLINE_H_
#define NS_SMILKEYSPLINE_H_
/**
* Utility class to provide scaling defined in a keySplines element.
*/
class nsSMILKeySpline
{
public:
nsSMILKeySpline() { /* caller must call Init later */ }
/**
* Creates a new key spline control point description.
*
* aX1, etc. are the x1, y1, x2, y2 cubic Bezier control points as defined by
* SMILANIM 3.2.3. They must each be in the range 0.0 <= x <= 1.0
*/
nsSMILKeySpline(double aX1, double aY1,
double aX2, double aY2)
{
Init(aX1, aY1, aX2, aY2);
}
double X1() const { return mX1; }
double Y1() const { return mY1; }
double X2() const { return mX2; }
double Y2() const { return mY2; }
void Init(double aX1, double aY1,
double aX2, double aY2);
/**
* Gets the output (y) value for an input (x).
*
* @param aX The input x value. A floating-point number between 0 and
* 1 (inclusive).
*/
double GetSplineValue(double aX) const;
void GetSplineDerivativeValues(double aX, double& aDX, double& aDY) const;
private:
void
CalcSampleValues();
/**
* Returns x(t) given t, x1, and x2, or y(t) given t, y1, and y2.
*/
static double
CalcBezier(double aT, double aA1, double aA2);
/**
* Returns dx/dt given t, x1, and x2, or dy/dt given t, y1, and y2.
*/
static double
GetSlope(double aT, double aA1, double aA2);
double
GetTForX(double aX) const;
double
NewtonRaphsonIterate(double aX, double aGuessT) const;
double
BinarySubdivide(double aX, double aA, double aB) const;
static double
A(double aA1, double aA2)
{
return 1.0 - 3.0 * aA2 + 3.0 * aA1;
}
static double
B(double aA1, double aA2)
{
return 3.0 * aA2 - 6.0 * aA1;
}
static double
C(double aA1)
{
return 3.0 * aA1;
}
double mX1;
double mY1;
double mX2;
double mY2;
enum { kSplineTableSize = 11 };
double mSampleValues[kSplineTableSize];
static const double kSampleStepSize;
};
#endif // NS_SMILKEYSPLINE_H_
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