[sane-devel] Xsane Length unit under View menu

[m. allan noah]

Sounds like a bug in XSane. I would suggest you contact it's author
and see if he has a suggestion, or perhaps an updated version.

allan

On Wed, Sep 26, 2012 at 10:03 AM, Ganapati Hegde
<ganapati.hegde at celstream.com> wrote:
> Hi ,
>
> For new backend , we are trying to change Length unit Option in View
> menu to inch or centimeter.
> Geometry Feature displays TL_X [in], though  option values[tl-x- etc]
> are not converted to inches or centimeters based on Length Unit
> selection as shown in Screenshot.  Value being displayed in geometry
> options (tl_x,etc) is in mm only.
> [TL_X -etc ] Units are in SANE_UNIT_MM  and using xsane as frontend.
> Can anyone tell us how to convert based on Length unit selection ?
>
> Regards
> Ganapati Hegde
>
> -----Original Message-----
> From: Olaf Meeuwissen [mailto:olaf.meeuwissen at avasys.jp]
> Sent: Wednesday, September 19, 2012 2:31 PM
> To: Ganapati Hegde
> Cc: sane-devel at lists.alioth.debian.org
> Subject: Re: [sane-devel] Xsane Length unit under View menu
>
> Ganapati Hegde writes:
>
>> Hi,
>
> Hi
>
>> 1. For new backend We are trying to access the length unit of the
>> geometry group for user defined paper sizes.
>
> Paper sizes have a name like A4 or Letter.  They don't have any units,
> that is, they're SANE_UNIT_NONE.
>
> I guess what you are trying to achieve is switching the units for a size
> description that's tagged onto the name.  This is not supported by SANE.
>
>> We see that the tl_x ,tl_y ,br_x, br_y is always set in mm, inspite of
>> the UI showing text (in) as in the attached screenshot.  Also is there
>> any setting that we can inform Xsane to handle this?  We have set the
>> Lenght unit in the option descriptor as MM as we sending all values to
>> XSane in mm.
>
> XSane has a "Length unit" option in the "View" menu that let's you pick
> a preferred display unit.  Internally all geometry handling is done in
> terms of SANE_UNIT_MM (or SANE_UNIT_PIXEL).
>
>> 2. For user defined paper sizes, if we change the Geometry, the rect
> in
>> the preview is not getting redrawn.
>> Can anyone tell us how to initiate redraw of the rectangle to reflect
>> the goemetry cordinates.
>
> When the paper size is changed in the backend, do you update the
> well-known geometry options (tl-x, etc.) too?  Do you inform the
> frontend that other options may have changed?
>
> You need to do so by or-ing in the SANE_INFO_RELOAD_OPTIONS in the last
> argument to sane_control_options(), after checking that the frontend
> didn't pass a NULL pointer of course.
>
> Hope this helps,
> --
> Olaf Meeuwissen, LPIC-2           FLOSS Engineer -- AVASYS CORPORATION
> FSF Associate Member #1962               Help support software freedom
>                  http://www.fsf.org/jf?referrer=1962
>
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