source_xyz.h

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#pragma once
 
// Source RGB -> XYZ in the pipeline working domain (P6, #4040).
//
// The matrix is derived once when a profile is bound, in float, and stored
// quantized. The per-pixel path is three multiply-accumulates per component
// in fixed point -- no float, no division, no allocation.
 
#include "fl/gfx/color_profile.h"
#include "fl/stl/int.h"
#include "fl/stl/noexcept.h"
 
namespace fl {

struct SourceMatrixQ16 {
    i32 m[3][3];
};

bool buildSourceMatrixQ16(const RgbPrimaries& primaries,
                          SourceMatrixQ16* out) FL_NO_EXCEPT;

void linearRgbToXyzQ16(const SourceMatrixQ16& matrix, u16 r, u16 g, u16 b,
                       i32 (&out_xyz)[3]) FL_NO_EXCEPT;
 
}  // namespace fl