power_ratio_of_255()

fl::u32 power_ratio_of_255	(	fl::u32	num,
		fl::u32	den )

min(255, floor(255 * num / den)) for den > 0, computed in 32-bit arithmetic.

The limiter's brightness ratio; declared for its tests.

Definition at line 386 of file power_mgt.cpp.hpp.

                                                            {
    if (num >= den) {
        return 255;
    }
    fl::u32 q = 0;
    fl::u32 r = num;
    for (fl::u8 bit = 0; bit < 8; ++bit) {
        q <<= 1;
        if (r >= den - r) {
            r -= den - r;
            q |= 1;
        } else {
            r += r;
        }
    }
    return r >= num ? q : q - 1;
}

References FL_NO_EXCEPT.

Referenced by brightness_within_budget().

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