dotSolveRowQ16()

i32 fl::anonymous_namespace{device_solve.cpp.hpp}::dotSolveRowQ16	(	const i32(&)	row[3],
		const i32(&)	v[3] )

Definition at line 189 of file device_solve.cpp.hpp.

                                                                        {
    const i64 acc = static_cast<i64>(row[0]) * static_cast<i64>(v[0])
                  + static_cast<i64>(row[1]) * static_cast<i64>(v[1])
                  + static_cast<i64>(row[2]) * static_cast<i64>(v[2]);
    const i64 rounded = acc >= 0 ? (acc + 32768) >> 16
                                 : -((-acc + 32768) >> 16);
    // Saturate rather than wrap. An extreme target can still land outside
    // s16.16 after the shift, and wrapping would turn an out-of-gamut
    // overshoot into a wildly wrong colour of the opposite sign, which the
    // gamut mapper downstream would then treat as legitimate.
    constexpr i64 kMax = 2147483647;
    constexpr i64 kMin = -2147483647 - 1;
    if (rounded > kMax) {
        return static_cast<i32>(kMax);
    }
    if (rounded < kMin) {
        return static_cast<i32>(kMin);
    }
    return static_cast<i32>(rounded);
}

References dotSolveRowQ16(), and fl::FL_NO_EXCEPT.

Referenced by dotSolveRowQ16().

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