Re: [Gimp-print-devel] OpenPrinting Project - Make Printer Applications Configurable

[Sambhav D. <sam...@gm...>]

On Sat, Sep 5, 2020 at 11:34 PM Robert Krawitz <rl...@al...> wrote:

> We really should move this discussion to
> gim...@li... (gimp-print was the
> original name for the project, which started with Mike's print plugin for
> GIMP and was later renamed
> to Gutenprint with the 5.0 release).
>

Sure, We'll move the discussion there.
How will you review the code If I simply push my changes there? There might
be many changes need to be made.


> For filling the driver data:
>
> Reference the stp_image_t structure defined in
> include/gutenprint/image.h.  You need to write the
> appropriate functions here.  You can see the CUPS driver implementation in
> src/cups/rastertogutenprint.c.
>
> Most of these are likely to be pretty simple.  The hard one, of course, is
> Image_get_row().  This is
> called by the core via stp_image_get_row().  This one's going to pull a
> row of raster data off the
> queue and stick it in the provided data buffer, up to the number of bytes
> specified (so you don't
> overflow the buffer) and returns a status (either OK or abort -- that's
> how a print can be aborted).
>

Yes. I've made the get_row function. To clear this out, there's no need for
dimensions variables like left, right, etc. in the cups_image_t structure
now, right? Since it will all be handled by PAPPL and we just have to pass
the data to gutenprint.

The raster format is either 8 or 16 byte (native ordering) K, W (inverse
> grayscale) RGB, CMY,CMYK,
> or KCMY.  There's also a "raw" format, which allows specifying arbitrary
> channels (currently
> supported only for Epson printers, don't worry about that for now).
>
> As for filling in settings, your application does that and does the
> necessary stp_set_* functions to
> set up all the options.
>

Do we have to call stp_print for gutenprint to start printing the job?

And I was asking for the callback function which PAPPL calls to fill the
driver data structure for PAPPL?

-- 
     Sambhav