Re: OpenType Features

[Jay Anderson]

On Mon, Jan 18, 2016 at 10:37 AM, Jay Anderson <address@hidden> wrote:
> On Mon, Jan 18, 2016 at 9:59 AM, Jay Anderson <address@hidden> wrote:
>> First issue: It appears that lilypond is dependent on pango 1.6
>> (pangoft2 - required 1.6.0, INSTALL.txt says pango 1.12 or newer so
>> I'm not totally sure what to believe.). OpenType features were added
>> in pango 1.18 (assuming I'm reading this correctly:
>> https://developer.gnome.org/pango/unstable/api-index-1-18.html). Are
>> there known issues with making this the new minimum version?
>
> I was a little wrong here. Those OpenType feature methods are
> deprecated. The supported way to set them is through PangoAttributes
> using the PANGO_ATTR_FONT_FEATURES attribute type
> (https://developer.gnome.org/pango/unstable/pango-Text-Attributes.html#PangoAttrType).
> This was added in 1.38 which was released in 2015 September
> (https://github.com/GNOME/pango/releases/tag/1.38.0). This is rather
> new (newer than my operating system includes - 1.36.3). So the minimum
> version would need to be _much_ newer than 1.18.

An update for those interested. I got something working. The attached
patch is certainly not ready to be merged, but I'm curious if the
chosen interface seems reasonable (see smallcaps.ly which is
attached). It adds a new 'font-features' property to the
font-interface (at least that's what I think I'm doing
http://www.lilypond.org/doc/v2.18/Documentation/internals/font_002dinterface).

This is using a method from pango 1.38. I'm not sure this issues
surrounding using such a new version. (It's newer than the version
included in ubuntu 15.10 for instance.)

I haven't tested it much yet, but I'm pleased with the output (tested
with Cardo - http://scholarsfonts.net/cardofnt.html).

Thanks!

-----Jay

0001-Initial-work-to-support-opentype-font-features.patch
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smallcaps.ly
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smallcaps.pdf
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