font{,/{opentype,gofont}},text: [API] drop monospace font metadata

In the general case, it isn't possible for us to efficiently find system fonts that
are monospace. Fonts don't advertise being monospace frequently, so the only way to
reliably detect it is to check that all glyphs are the same width. This is expensive,
far too much so to be done on every system font when there may be thousands of them.

Other font resolution systems rely upon the user requesting fonts by their family name.
If you want a monospace font, ask for it by name or use a generic name like 'monospace'.
This will be Gio's approach from here on out.

Existing code relying upon setting Variant="Mono" should instead set Typeface="Go Mono"
(for the Go font) or specify another monospace typeface. The generic face "monospace"
will search for one of a set of known monospace fonts that may be available on the system.

Similarly, smallcaps isn't well advertised and users should rely on requesting all-smallcaps
fonts by typeface. To get the Go smallcaps font, use Typeface="Go Smallcaps".

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>

This commit is contained in:

Chris Waldon

2023-06-22 15:00:22 -04:00

committed by

Elias Naur

parent 5606a961f2

commit 15031d0b52

4 changed files with 92 additions and 55 deletions

									
										text/gotext.go
									
		+1
		-1
	
												View File
												
				@@ -895,7 +895,7 @@ func closestFont(lookup giofont.Font, available []giofont.Font) (giofont.Font, b

						if cf == lookup {

							return lookup, true

						}

						if cf.Typeface != lookup.Typeface || cf.Variant != lookup.Variant || cf.Style != lookup.Style {

						if cf.Typeface != lookup.Typeface || cf.Style != lookup.Style {

							continue

						}

						if !found {