The Tor Browser: gfx/thebes/gfxQuaternion.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef GFX_QUATERNION_H

     7 #define GFX_QUATERNION_H

     9 #include "mozilla/gfx/BasePoint4D.h"

    10 #include "gfx3DMatrix.h"

    11 #include "nsAlgorithm.h"

    12 #include <algorithm>

    14 struct gfxQuaternion : public mozilla::gfx::BasePoint4D<gfxFloat, gfxQuaternion> {

    15     typedef mozilla::gfx::BasePoint4D<gfxFloat, gfxQuaternion> Super;

    17     gfxQuaternion() : Super() {}

    18     gfxQuaternion(gfxFloat aX, gfxFloat aY, gfxFloat aZ, gfxFloat aW) : Super(aX, aY, aZ, aW) {}

    20     gfxQuaternion(const gfx3DMatrix& aMatrix) {

    21         w = 0.5 * sqrt(std::max(1 + aMatrix[0][0] + aMatrix[1][1] + aMatrix[2][2], 0.0f));

    22         x = 0.5 * sqrt(std::max(1 + aMatrix[0][0] - aMatrix[1][1] - aMatrix[2][2], 0.0f));

    23         y = 0.5 * sqrt(std::max(1 - aMatrix[0][0] + aMatrix[1][1] - aMatrix[2][2], 0.0f));

    24         z = 0.5 * sqrt(std::max(1 - aMatrix[0][0] - aMatrix[1][1] + aMatrix[2][2], 0.0f));

    26         if(aMatrix[2][1] > aMatrix[1][2])

    27             x = -x;

    28         if(aMatrix[0][2] > aMatrix[2][0])

    29             y = -y;

    30         if(aMatrix[1][0] > aMatrix[0][1])

    31             z = -z;

    32     }

    34     gfxQuaternion Slerp(const gfxQuaternion &aOther, gfxFloat aCoeff) {

    35         gfxFloat dot = mozilla::clamped(DotProduct(aOther), -1.0, 1.0);

    36         if (dot == 1.0) {

    37             return *this;

    38         }

    40         gfxFloat theta = acos(dot);

    41         gfxFloat rsintheta = 1/sqrt(1 - dot*dot);

    42         gfxFloat rightWeight = sin(aCoeff*theta)*rsintheta;

    44         gfxQuaternion left = *this;

    45         gfxQuaternion right = aOther;

    47         left *= cos(aCoeff*theta) - dot*rightWeight;

    48         right *= rightWeight;

    50         return left + right;

    51     }

    53     gfx3DMatrix ToMatrix() {

    54         gfx3DMatrix temp;

    56         temp[0][0] = 1 - 2 * (y * y + z * z);

    57         temp[0][1] = 2 * (x * y + w * z);

    58         temp[0][2] = 2 * (x * z - w * y);

    59         temp[1][0] = 2 * (x * y - w * z);

    60         temp[1][1] = 1 - 2 * (x * x + z * z);

    61         temp[1][2] = 2 * (y * z + w * x);

    62         temp[2][0] = 2 * (x * z + w * y);

    63         temp[2][1] = 2 * (y * z - w * x);

    64         temp[2][2] = 1 - 2 * (x * x + y * y);

    66         return temp;

    67     }

    69 };

    71 #endif /* GFX_QUATERNION_H */

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