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	Thu, 10 Sep 2015 14:46:28 -0700 (PDT)
Date:	Thu, 10 Sep 2015 23:46:26 +0200
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Notice to developers: layers have now a type.
Message-Id:	<20150910234626.6b47dbc26c5ebd5d69eebab3@gmail.com>
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On Thu, 10 Sep 2015 23:34:23 +0200
"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.
> 
> - - -
> 
> 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.
> 


Really great !!

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