oklab_q16.h

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#pragma once
 
// OKLab in the pipeline working domain (P7, #4041).
//
// The gamut mapper selected in docs/color-gamut-algorithm-selection.md works
// in OKLab, so the working domain needs the transform in s16.16 rather than
// in float. Both directions are three multiply-accumulates per component
// around a per-component nonlinearity -- a cube root going in, a cube coming
// back -- with no float, no division, no allocation and no trigonometry.
//
// The matrices are universal constants rather than profile-derived, so they
// are quantized at compile time and cost nothing to build.
 
#include "fl/stl/int.h"
#include "fl/stl/noexcept.h"
 
namespace fl {

constexpr i32 kOklabQ16MaxMagnitude = 64 * 65536;

void xyzToOklabQ16(const i32 (&xyz)[3], i32 (&out_lab)[3]) FL_NO_EXCEPT;

void oklabToXyzQ16(const i32 (&lab)[3], i32 (&out_xyz)[3]) FL_NO_EXCEPT;
 
}  // namespace fl