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Date: Mon, 16 Jul 2012 10:41:04 -0700
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Merge layers during print
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On Mon, 16 Jul 2012 09:44:20 -0700
Russell Dill <Russ DOT Dill AT asu DOT edu> wrote:

> So in my case I want a couple of holes in the paste stencil to
> line up with a couple of unplated drills. So I make a new layer,
> set skip-print to 1, and set merge to toppaste, then add a couple
> of zero length traces that line up with the drill holes.

So the 'merge' feature is acting in a 'negative' way?  Since the
toppaste layer is where paste DOES go, you are drawing on the new
layer and then SUBTRACTING this layer from the toppaste layer?
On the other hand, your 'fab-notes' example suggests an additive
method of merging.  I didn't read all the code, but how is this
achieved?

I think it would make the most sense to set the
PCB::merge::mode=add or PCB::merge::mode=subtract to define this?
Or perhaps I am misunderstanding this.

> I have another layer called fab-notes where I have graphics and
> notes, such as an arrow with text, "exposed copper ok", or "gold
> plated fingers", etc. PCB::merge is set to fab on this layer.

Awesome.

Regards,
Colin