[Xastir] Weather maps are now black

[Curt, WE7U]

On Wed, 20 Jun 2007, Curt, WE7U wrote:

> Hmmm...  We _could_ change that by adding a fixed length table or a
> linked list of transparent values found in the .geo.  This would
> slow down the rendering code a bit if there were several values
> listed, but it doesn't sound terribly difficult to add this feature.
> This could also allow some neat stuff like removing removing water,
> railroads, green areas, etc. from other maps.
>
> If implementing this I'd probably recommend a linked list so that
> the number of transparent values possible wasn't fixed.

map_geo.c:

    unsigned long trans_color

    draw_WMS_map(w,
            filenm,
            destination_pixmap,
            fileimg,
            do_check_trans,
            trans_color,
            nocache);

    int check_trans (XColor c, unsigned long c_trans_color);

We'd want to change "trans_color" to an array or linked list, change
the section where we look for "TRANSPARENT" so that it adds to the
list instead of working on "trans_color" each time, then change
check_trans() to pass it the list of transparent colors so that it
can check each pixel against the entire list.  Change draw_WMS_map()
to work against the entire list as well if we want to be complete.

--
Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
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