Two glyph-cell differences from 1.12.1.
Rows: the client keeps at most the font's pixel em of a glyph's rows. `0x5d1120` stores `min(em, rows)` (`0x5d1195`-`0x5d11a2`), and every bake reads that many rows from the top. benilla packed the full raster, so unhinted glyphs one row taller than the em (FRIZQT `ý þ` at 14 px, Arial Narrow `Ò Ó Ù Ü` at 14 px) drew a faint extra row. Cells are now clipped to their first `ppem` rows before the ring is built.
Alpha: the client's glyph texels are ARGB4444. The plain bake keeps coverage's top 4 bits (`0x5cf298`-`0x5cf2a1`), and the outlined fill's gray is `(cov·0xff) >> 12` (`0x5cf1b8`). benilla packed 8-bit coverage. Coverage cells and outlined fills now pack 4-bit values, so coverage under 16 draws nothing, as in 1.12.1.
Tests: an over-tall `Ò` keeps its top 14 rows, and every packed alpha is 4-bit exact.
Fixes#1827Fixes#1828🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Sam Sung
cff056c367