Function eval

src/fl/gfx/gamma_lut.h:174–183

// Computes: clamp(round(pow(x/255, gamma) * 255), 0, 255)

constexpr u8 eval(u8 x, u32 gamma_raw) FL_NOEXCEPT {
    return x == 0   ? static_cast<u8>(0)
         : x == 255 ? static_cast<u8>(255)
         : static_cast<u8>(
               (pow_fp(
                   static_cast<u32>((static_cast<u64>(x) << FRAC) / 255),
                   gamma_raw
               ) * 255ULL + (SCALE >> 1)) >> FRAC
           );
}

// ---- 16-bit gamma correction for a single pixel value ----
// Computes: clamp(round(pow(x/255, gamma) * 65535), 0, 65535)