BitExtract

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Revision as of 12:31, 2 January 2014 by Myonlake (talk | contribs)
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This function returns the unsigned number formed by the bits field to field + width - 1 (range: 0-31).

Syntax

uint bitExtract ( uint var, int field, [int width = 1] )

Required arguments

  • var: The value
  • field: The field number
  • width: Number of bits to extract

Returns

Returns the extracted value/bit sequence.

Example

function getColorAlpha(color)
   return bitExtract(color,24,8) -- return bits 24-32 ( the alpha, http://en.wikipedia.org/wiki/RGBA_color_space ) 
end

See Also

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