fonts/readerly
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Prepare for initial release

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This commit is contained in:
Nico Verbruggen
2026-03-02 02:17:52 +01:00
parent e8ea8d204b
commit 04374e77c5
6 changed files with 104 additions and 29 deletions
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15
scripts/metrics.py
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@@ -155,18 +155,19 @@ else:
typo_extent = typo_ascender - typo_descender
# ── OS/2 Win metrics ─────────────────────────────────────────────────────────
# Clipping boundaries on Windows. Must cover every glyph or Windows clips them.
# usWinDescent is a *positive* distance below the baseline (unlike Typo/hhea).
# Clipping boundaries on Windows. Based on the design ascender/descender
# (not the full font bbox, which can be inflated by stacked diacritics like
# Aringacute). A small margin prevents clipping of hinting artefacts.
margin = int(math.ceil(upm * CLIP_MARGIN))
win_ascent = int(math.ceil(max(font_ymax, design_top))) + margin
win_descent = int(math.ceil(max(abs(font_ymin), abs(design_bot)))) + margin
win_ascent = int(math.ceil(design_top)) + margin
win_descent = int(math.ceil(abs(design_bot))) + margin
# ── hhea metrics ──────────────────────────────────────────────────────────────
# macOS/iOS always uses hhea for *both* line spacing and clipping (it ignores
# USE_TYPO_METRICS). To keep line height consistent across platforms, we fold
# the Typo lineGap into hhea ascent/descent so hhea_lineGap can be 0.
# Then we take the max with the font bbox to also prevent Mac clipping.
# Based on design ascender/descender, not the full font bbox.
half_gap = typo_linegap // 2
extra = typo_linegap - 2 * half_gap # +1 rounding remainder → ascent side
@@ -174,8 +175,8 @@ extra = typo_linegap - 2 * half_gap # +1 rounding remainder → ascent sid
spacing_asc = typo_ascender + half_gap + extra
spacing_dsc = typo_descender - half_gap # more negative
hhea_ascent = max(spacing_asc, int(math.ceil(font_ymax)) + margin)
hhea_descent = min(spacing_dsc, int(math.floor(font_ymin)) - margin) # negative
hhea_ascent = max(spacing_asc, int(math.ceil(design_top)) + margin)
hhea_descent = min(spacing_dsc, int(math.floor(design_bot)) - margin) # negative
hhea_linegap = 0
# ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━