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Date:	Thu, 10 Sep 2015 21:53:24 +0000
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Subject:	Re: [geda-user] Notice to developers: layers have now a type.
From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Thu, Sep 10, 2015 at 9:34 PM, Markus Hitter (mah AT jump-ing DOT de) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> Dear developers,
>
> unless there appears evidence it doesn't work as expected, I'll forward
> branch LP1493557 to master tomorrow. It's the essence of a patch made by
> DJ Delorie in 2007 and some of my work for refining. Every single commit
> passes the regression test.
>
> The new code will give layers a type. These types exist (see hid.h and
> strflags.c):
>
>   "copper",       /* LT_COPPER */
>   "silk",         /* LT_SILK */
>   "mask",         /* LT_MASK */
>   "pdrill",       /* LT_PDRILL */
>   "udrill",       /* LT_UDRILL */
>   "paste",        /* LT_PASTE */
>   "invisible",    /* LT_INVISIBLE */
>   "fab",          /* LT_FAB */
>   "assy",         /* LT_ASSY */
>   "outline",      /* LT_OUTLINE */
>   "route",        /* LT_ROUTE */
>   "notes",        /* LT_NOTES */
>   "keepout",      /* LT_KEEPOUT */
>   "no_type"       /* LT_NUM_LAYERTYPES */
>
> To the left the name as it appears in the saved file, to the right the
> flag to test for in code.

Does this mean that you can now draw voids in the mask layer?

> - - -
>
> Examples:
>
> To test wether a specific layer is a copper (conductive) layer, do it
> like this:
>
>   if (PCB->Data->Layer[index].Type == LT_COPPER)
>     ...
>
> To iterate through all layers of a specific type, there's now a
> comfortable macro. For example to loop over all paste layers:
>
>   LAYER_TYPE_LOOP (PCB->Data, max_copper_layer + SILK_LAYER, LT_PASTE)
>     do_something_with (layer);
>     layer_number_is (n);
>   END_LOOP;
>
>
> N.B. the term 'max_copper_layer + SILK_LAYER' is simply the number of
> defined layers, so you get all defined layers. For details see src/const.h.
>
> - - -
>
> How does this meet existing design files?
>
> Currently the above techniques aren't in use, yet, all code still uses
> various voodoo heuristics in many places to guess the type of a layer as
> it did the last 20 years. So, no immediate change in behaviour expected.
>
> When loading older files, some such voodoo heuristics
> ("guess_layertype()") is now used right at load time. So all future code
> can rely on an existing layertype from now on. Patches replacing old
> heuristics by simple tests or loops, like shown above, are very welcome.
>
> At save time, layer types are saved, so this guessing is done only once.
> Former layer definition:
>
>   Layer(1 "component")
>
> From now on
>
>   Layer(1 "component" "copper")
>
> Easy to edit, it's Layer(<number> <name> <type>)
>
> Older versions of pcb can load files saved with newer version, they
> simply ignore the type field.
>
>
> As said, code is currently on the LP1493557 branch in the official Git repo:
> http://git.geda-project.org/pcb/log/?h=LP1493557
>
>
> Happy hacking,
> Markus
>
> --
> - - - - - - - - - - - - - - - - - - -
> Dipl. Ing. (FH) Markus Hitter
> http://www.jump-ing.de/



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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