[hb-ot-var] Specify normalized 2.14 docs

Fixes https://github.com/harfbuzz/harfbuzz/issues/3345
2021-12-22 21:51:03 -07:00 · 2021-12-22 21:51:03 -07:00 · 6da4b80e5f
parent 1b51be57dc
commit 6da4b80e5f
1 changed files with 3 additions and 0 deletions
--- a/src/hb-ot-var.cc
+++ b/src/hb-ot-var.cc
@ -303,6 +303,9 @@ hb_ot_var_normalize_variations (hb_face_t            *face,
 * values for the axis are mapped to the interval [-1,1], with the default
 * axis value mapped to 0.
 *
+ * The normalized values have 14 bits of fixed-point sub-integer precision as per
+ * OpenType specification.
+ *
 * Any additional scaling defined in the face's `avar` table is also
 * applied, as described at https://docs.microsoft.com/en-us/typography/opentype/spec/avar
 *