subsetter

• For variable fonts where the selected coordinates end up at the default instance, the subsetter now avoids instancing, instead reusing the existing outlines

• Fixed generated left-side bearing value for variable fonts. This bug could lead to wonky-looking kerning for variable fonts.

• Fixed a potential crash for invalid CFF fonts
• Fixed potential crash for invalid hhea tables
• Fixed a bug where CFF subroutines were not properly terminated
• Fixed that storageOffset in name table was not respected
• Fixed potentially invalid maxp data being emitted for variable TTF fonts
• Fixed potentially invalid hinting data being emitted for variable TTF fonts
• Fixed some potential overflows
• Bumped skrifa to 0.42, kurbo to 0.13, and write-fonts to 0.48
• Raised MSRV to Rust 1.85

• Added support for subsetting variable fonts by instancing them
  • This is feature-flagged behind the variable-fonts feature, which is now enabled by default
  • A new API subset_with_variations was added to specify the variation coordinates
• Subsetting now preserves more name table records (7, 8, 9, 11, 12, 13, 14 from the spec)
• Bumped the kurbo dependency to version 0.12
• Added MSRV of Rust 1.82

This release has no publicly-facing changes. Internally, the fxhash dependency was replaced by rustc-hash as fxhash is unmaintained.

• Performance improvements
  • Marked GlyphRemapper::{remap, get} as inlinable
  • Improved performance of GlyphRemapper by internally switching from BTreeMap to FxHashMap

This release contains a full rewrite of the CFF subsetting and various improvements for TrueType subsetting, yielding highly reduced output sizes. This goes along with a new public API as the crate now requires its users to remap glyph IDs (this is required for minimizing file sizes). Thanks to @LaurenzV for their work on all of this!

Fixes two bugs with CFF subsetting.