[sane-devel] Seeking Odd-Page Vertical Flipping to Support ADF-Duplex

[m. allan noah]

Is it rotated, or is it mirrored?

allan

On Thu, May 31, 2012 at 11:27 AM, Jeff Rush <jrush at taupro.com> wrote:
> I'm working in the sane-epson2 backend, trying to get it to fully
> support adf-duplex for scanning both sides of a page, for the Epson
> ES-H-300 scanner.
>
> I've just submitted a patch (#313667) to enable the duplexing.  It
> works, and now I have a button on XSANE under Advanced Options.  However
> the even (backside) page is 180-degrees rotated.
>
> So as I'm looking thru the driver source, I thought I'd ask if there is
> a standard configuration/setting in one of the internal data structures
> I can use to cause every other page to be vertically flipped?
>
> If not, I'm going to add to the epson2 driver some logic to invoke
> sanei_magic_rotate() on the even-numbered pages, conditionally upon
> whether the adf-duplex feature is enabled.  It seems this kind of logic
> would be useful to others, and perhaps even already in the code someplace.
>
> Suggestions or guidance welcome.
>
> -Jeff
>
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