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[skera] Partially instance coupled avar2 mappings #2253

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[skera] Partially instance coupled avar2 mappings #2253

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f27d1b5
[skera] Partially instance coupled avar2 mappings
behdad Oct 9, 2026
f61addb
[skera] Update style metadata for coupled avar2 instances
behdad Oct 9, 2026
82cf252
Merge commit 'da7e8facac73b3aa5e6e0c59cfc2622b20ffb67b' into HEAD
behdad Oct 15, 2026
490a8a0
Merge commit '22dcc3e13502b90d37f7e2f1b6b19570b47cfcc0' into HEAD
behdad Oct 15, 2026
896c142
[skera] Integrate current main and CFF review fixes
behdad Oct 21, 2026
cd5fada
[skera] Integrate reviewed instancing fixes into coupled avar2
behdad Oct 22, 2026
5186703
[skera] Preserve restored full-instance ancestry through #2253
behdad Oct 22, 2026
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12 changes: 7 additions & 5 deletions skera/README.md
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Expand Up @@ -24,8 +24,10 @@ Add `--downgrade-cff2` to emit a full instance as CID-keyed CFF1. The library
also exposes `downgrade_cff2`; it preserves glyph IDs and encodes CFF1 widths
from the instanced metrics.

Full instancing supports `avar` version 2. Partial instancing currently
requires separable axis maps (`avar` version 1).
Full and partial instancing support `avar` versions 1 and 2. For coupled
`avar` version 2 maps, pinned axes remain hidden until the font is fully
instantiated. Range compensation preserves the original final-coordinate
space, subject to F2Dot14 quantization.

## Installation

Expand Down Expand Up @@ -127,9 +129,9 @@ perf report
```

At this stack boundary, instancing supports full and partial CFF2 fonts,
including variable COLR paints and full avar2 locations. Partial coupled avar2,
extended glyph or metric tables, and unhandled consumers of GDEF's variation
store return an error until their handlers are introduced.
including variable COLR paints and coupled avar2 locations. Extended glyph
or metric tables and unhandled consumers of GDEF's variation store return an
error until their handlers are introduced.

CFF2 outline blends round the complete resolved operand using floating-point
region scalars. Metrics measure the continuous source outline with double
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