ActionScript 3 :: Function To Perform Circular Bitshift On Uint?
Feb 2, 2011
I am new to the concept of Bitwise operations, and was messing around with some examples today. Everything seemed clear up until the point I tried to make a function to perform a circular bitshift on a uint:
private function rotateLeft(value : uint, shift : int) : uint {
if ((shift &= 31) == 0)
return value;
return (value << shift) | (value >> (32 - shift));
}
I was trying to shift a colour value (e.g. 0xFF0000) and expecting something along the lines of 0x0000FF, when in actual fact I was getting 0xFF000000 (which is correct, due to the length of a uint) - the most significant bytes are for the alpha value.
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