[sane-devel] WS-Scan (WSD scan)

[Thierry HUCAHRD]

Le 2020-03-01 22:48, Alexander Pevzner a écrit :
> Hi,
> 
> I'm currently working on adding WSD support to sane-airscan. Somebody
> tried to implement WS-Scan before?
hi,

Klaus KämpfAdd introduced us to his work a few weeks ago.
https://gitlab.com/kkaempf/backends/-/blob/wsd-scan/

> 
> In general, everything works, more or less, but I observe few strange 
> things:
> 
> 1) device reports its size in landscape orientation, though returned
> images has a portrait orientation. Is it normal behavior, or
> device-specific bug? In another words, should I simply and
> unconditionally swap X and Y dimensions, or more complicated logic is
> required here?
> 
> 2) Unlike eSCL, WSD scan, even when requested from a computer, needs
> to be explicitly started by pressing buttons on a device front panel.
> Otherwise, device rejects scan request. Windows Scan behaves a similar
> way. And this is especially inconvenient. Is it a normal behavior, or
> I missing something?
> 
> 3) Though protocol defines a method to specify scan region, device
> completely ignores these parameters and always returns a full page. Is
> it normal?