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dom/smil/nsSMILKeySpline.h@129ffea94266 (annotated)

dom/smil/nsSMILKeySpline.h

Sat, 03 Jan 2015 20:18:00 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Sat, 03 Jan 2015 20:18:00 +0100

branch

TOR_BUG_3246

changeset 7

129ffea94266

permissions

-rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

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