xyzToOklabQ16()

void fl::xyzToOklabQ16	(	const i32(&)	xyz[3],
		i32(&)	out_lab[3] )

XYZ (s16.16, D65-relative) -> OKLab (s16.16), L then a then b.

The cube root is fl::icbrt64, exact to within one ULP. That the exact root is what the mapper needs, and how much slack it has, is measured in docs/color-gamut-algorithm-selection.md.

Definition at line 123 of file oklab_q16.cpp.hpp.

                                                                        {
    const i32 clamped[3] = {clampOklabQ16(xyz[0], kOklabQ16MaxMagnitude),
                            clampOklabQ16(xyz[1], kOklabQ16MaxMagnitude),
                            clampOklabQ16(xyz[2], kOklabQ16MaxMagnitude)};
    i32 lms[3];
    dotOklabMatrixQ16(kLmsFromXyz, clamped, lms);
    const i32 root[3] = {
        signedCbrtQ16(lms[0]), signedCbrtQ16(lms[1]), signedCbrtQ16(lms[2])};
    dotOklabMatrixQ16(kOklabFromLmsRoot, root, out_lab);
}

References FL_NO_EXCEPT, and kOklabQ16MaxMagnitude.

Referenced by buildGamutMapFromSolveQ16(), buildGamutMapRgbwFromSolveQ16(), buildGamutMapRgbwwFromSolveQ16(), mapAndAllocateRgbwQ16(), mapAndAllocateRgbwwQ16(), and mapAndSolveDrivesQ16().

Here is the caller graph for this function: