lsrX4()

uint8_t fl::lsrX4 ( uint8_t dividend )

inline

Helper function to divide a number by 16, aka four logical shift right (LSR)'s.

On avr-gcc, "u8 >> 4" generates a loop, which is big, and slow. merely forcing it to be four /=2's causes avr-gcc to emit a SWAP instruction followed by an AND 0x0F, which is faster, and smaller.

Definition at line 240 of file colorutils.cpp.

                                       {
#if defined(__AVR__)
    dividend /= 2;
    dividend /= 2;
    dividend /= 2;
    dividend /= 2;
#else
    dividend >>= 4;
#endif
    return dividend;
}

Referenced by ColorFromPalette(), ColorFromPalette(), and ColorFromPalette().

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