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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /dom/smil/SMILKeySpline.h | |
parent | Initial commit. (diff) | |
download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/smil/SMILKeySpline.h')
-rw-r--r-- | dom/smil/SMILKeySpline.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/dom/smil/SMILKeySpline.h b/dom/smil/SMILKeySpline.h new file mode 100644 index 0000000000..d5f180e94a --- /dev/null +++ b/dom/smil/SMILKeySpline.h @@ -0,0 +1,107 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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 DOM_SMIL_SMILKEYSPLINE_H_ +#define DOM_SMIL_SMILKEYSPLINE_H_ + +#include "mozilla/ArrayUtils.h" +#include "mozilla/PodOperations.h" + +namespace mozilla { + +/** + * Utility class to provide scaling defined in a keySplines element. + */ +class SMILKeySpline { + public: + constexpr SMILKeySpline() : mX1(0), mY1(0), mX2(0), mY2(0) { + /* 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 + */ + SMILKeySpline(double aX1, double aY1, double aX2, double aY2) + : mX1(0), mY1(0), mX2(0), mY2(0) { + 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; + + bool operator==(const SMILKeySpline& aOther) const { + return mX1 == aOther.mX1 && mY1 == aOther.mY1 && mX2 == aOther.mX2 && + mY2 == aOther.mY2; + } + bool operator!=(const SMILKeySpline& aOther) const { + return !(*this == aOther); + } + int32_t Compare(const SMILKeySpline& aRhs) const { + if (mX1 != aRhs.mX1) return mX1 < aRhs.mX1 ? -1 : 1; + if (mY1 != aRhs.mY1) return mY1 < aRhs.mY1 ? -1 : 1; + if (mX2 != aRhs.mX2) return mX2 < aRhs.mX2 ? -1 : 1; + if (mY2 != aRhs.mY2) return mY2 < aRhs.mY2 ? -1 : 1; + return 0; + } + + 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; +}; + +} // namespace mozilla + +#endif // DOM_SMIL_SMILKEYSPLINE_H_ |