Kerning and marks

1

Hi all
Does Kerning ignore marks?
1- If so, how can I have kerning with marks? Will it consider marks? at least did not ignore all marks
2- How can I write kerning conditional with 3 glyphs? (like this: if A then B then C: kerning between A and B is … otherwise is none)

2

When kerning with precomposed glyphs (base glyph component + mark components), you can kern as usual.

To take combining marks into consideration, you need to write feature code. There, you can control whether marks should be ignored or not.

3

Can you show me how?
Thanks

4

This is a wide-ranging topic. If you have specific needs, then I can help you with those once I know the details. If you want to learn the general idea, this book can help (section Lookup Flags):

5

One approach is Composition. It has better support in older applications, and it’s easier to control a kerning exceptions visually, and that’s why I prefer it.

  1. Generate a composite glyphs – with a sidebar filter or with recipes. In both cases you can generate about 570+ Latin composites at once. The recipes may looks like this:
A+acutecomb=Aacute
A+brevecomb=Abreve
  1. Set the Left and Right Groups of composite glyphs the same as groups of a base glyphs. For example, groups of Aacute should be the same as A groups. It could be automated with a script.
  2. Add the ccmp feature to compose base glyphs and marks to your composite glyphs (preferably limited by script and sometimes by language) that may looks like this:
sub A acutecomb by Aacute;
sub A brevecomb by Abreve;

More about diacritics and composite glyphs: Diacritics | Glyphs

Another approach is Decomposition. It doesn’t use a composite glyphs (the main goal is to reduce the file size like for webfonts), but relies solely on anchors, mark and mkmk features, and contextual kerning, as Florian mentioned: Contextual kerning | Glyphs. Also, in case of decomposition, the ccmp feature should be reversed, to decompose instead of compose.

sub Aacute by A acutecomb;
sub Abreve by A brevecomb;
6

Thanks a lot
Much helpful

7

Thanks @FlorianPircher
Very helpful