Driving LED matrix with shift registers such as 74HC595

@Gordon, I assume it is shift right rather than shift left, is it?

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return (x&1)|((x>>3)&2)|((x>>6)&4)|((x>>9)&8)|
              ((x>>12)&16)|((x>>15)&32)|((x>>18)&64)|(­(x>>21)&128);
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