dom/smil/nsSMILKeySpline.h@97036ab72558 (annotated)
dom/smil/nsSMILKeySpline.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| 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_ |
