[sane-devel] padded formats

[m. allan noah]

On Tue, 28 Mar 2006, Felix Rubio Dalmau wrote:

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> In SANE documentation is told that the number of bytes per line is
> padded by the formula gived there. Can I assume that the bytes of data
> are consecutive and, consequently, I should only remove the final bits
> (the ones to seem be the "padding bits") ?
> For example, if I have a line with 3 pixels, with 3 channels and a
> depth of 8 I should have 3 * 3 * 8 bpp/ 8 =  9 bytes but by the
> formula, I get 3 * 3 * [(8 + 7)/8 ] = 18 bytes. Can I remove the final
> 9 bytes? How must I manage this data? I know that it's a basic
> question, but I'm tryin to learn it :-) thanks!

no, this is integer math, hence the []. this basically means that 
[(8+7)/8] = 1

so both versions are 9 bytes.

allan

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