[cairo] Patch to allow Cairo-based software to print to laser cutters on Windows

[Bill Spitzak]

I would very much like to see line width of 0.0 mean "device dependent
hairline" and requested it several times, but I believe this idea was
rejected. Not sure if it should be implemented only for this one device.

On Thu, Oct 18, 2018 at 9:18 AM Carl Worth <cworth at cworth.org> wrote:

> On Wed, Oct 17 2018, Rick Yorgason wrote:
> > With this patch, I can use Inkscape to set my stroke width to 0.001" and
> > it will cut through the material as expected.
>
> If we're going to have a magic value here, I think I'd be much happier
> to have 0 be the magic value.
>
> (I know that your code isn't actually making 0.001" be magic, but a
> whole range of values. I think I would really prefer to have that range
> include rather then exclude 0.0.)
>
> Does anyone see any reason why a stroke width of 0 shouldn't be treated
> this way?
>
> I think that would make a much better way to be able to document
> this. ("Use a value of 0 to get a PS_COSMETIC pen which is useful when
> targeting devices such as laser cutters".)
>
> And speaking of documentation, it seems this patch should also be
> touching up the documentation, such as in cairo_set_line_width?
>
> I know the code is specific to the Windows backend, but I think it's
> reasonable to put a backend-specific note into the general documentation
> in a case like this.
>
> -Carl
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