[sane-devel] Frame Types

[Kåre Särs]

On Tuesday 10 February 2009, m. allan noah wrote:
> On Tue, Feb 10, 2009 at 2:54 PM, Kåre Särs <kare.sars at kolumbus.fi> wrote:
> > Hi,
> >
> > How common is it that backends return frame types SANE_FRAME_RED/GREEN/BLUE?
> >
> > At the moment libksane reserves memory for the whole returned image and in
> > case the backend returns the colors separately they are assembled to "normal"
> > RGB format before the image data is returned to the user. Now there is a need
> > to return the data for large images in chunks in stead of the whole thing at
> > once. So the question is: Is it worth the time to work around this by
> > splitting up the selected area and scanning one part at a time or is these
> > frames only used in very few exotic models?
> 
> Scanning in parts wont work with ADF machines. 14 backends contain
> 'SANE_FRAME_RED':
> 
> agfafocus
> apple
> artec
> bh
> microtek
> microtek2
> mustek
> pie
> pint
> pnm
> tamarack
> teco1
> test
> umax
> 
> While rare, at least some of those machines are still in use
> somewhere. You might just have to go into blocking mode for those
> machines.
> 

Thanks,

I think I will have to return an error at scan time for this, since I guess the only way to know for sure that I'll get those frames is with sane_get_parameters() after sane_start().


-- 
Kåre Särs