curioustorvald/Terrarum-sans-bitmap
1
0
Fork 0
mirror of https://github.com/curioustorvald/Terrarum-sans-bitmap.git synced 2026-03-07 11:51:50 +09:00
Code Issues Packages Projects Releases Wiki Activity

contextual visarga

Browse Source
This commit is contained in:
minjaesong
2026-02-27 08:26:19 +09:00
parent e3a3079fb2
commit 95912acc32
6 changed files with 44 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

BIN
OTFbuild/calligra_font_tests.odt
View File

Binary file not shown.

3
OTFbuild/font_builder.py
View File

@@ -371,6 +371,9 @@ def build_font(assets_dir, output_path, no_bitmap=False, no_features=False):
try:
fea_stream = io.StringIO(fea_code)
addOpenTypeFeatures(font, fea_stream)
# Obtain raw .fea text for debugging
# with open("debugout_features.fea", "w") as text_file:
# text_file.write(fea_code)
print(" Features compiled successfully")
except Exception as e:
print(f" [WARNING] Feature compilation failed: {e}")

32
OTFbuild/opentype_features.py
View File

@@ -856,6 +856,38 @@ def _generate_devanagari(glyphs, has, replacewith_subs=None):
feat.append("} psts;")
features.append('\n'.join(all_lookups + [''] + feat))
# --- calt: contextual Visarga ---
# When Visarga (U+0903) is followed by a Devanagari character (mid-word),
# substitute with interword variant (uF010A). calt is applied globally
# across syllable boundaries, unlike psts which is per-syllable.
INTERWORD_VISARGA = 0xF010A
visarga = 0x0903
if has(visarga) and has(INTERWORD_VISARGA):
# Build class of Devanagari characters that can follow Visarga mid-word:
# PUA consonants (full, half, RA-appended, RA-appended half) + independent vowels
deva_following_cps = (
list(SC.DEVANAGARI_PRESENTATION_CONSONANTS) +
list(range(0xF0230, 0xF0320)) + # half forms
list(SC.DEVANAGARI_PRESENTATION_CONSONANTS_WITH_RA) +
list(range(0xF0410, 0xF0500)) + # RA-appended half forms
list(range(0x0904, 0x0915)) + # independent vowels
list(range(0x0915, 0x093A)) + # Unicode consonants (before ccmp)
list(range(0x0958, 0x0962)) # nukta consonants
)
deva_following = [glyph_name(cp) for cp in sorted(set(deva_following_cps)) if has(cp)]
if deva_following:
calt_lines = []
calt_lines.append(f"lookup InterwordVisarga {{")
calt_lines.append(f" sub {glyph_name(visarga)} by {glyph_name(INTERWORD_VISARGA)};")
calt_lines.append(f"}} InterwordVisarga;")
calt_lines.append("")
calt_lines.append("feature calt {")
calt_lines.append(" script dev2;")
calt_lines.append(f" @devaFollowing = [{' '.join(deva_following)}];")
calt_lines.append(f" sub {glyph_name(visarga)}' lookup InterwordVisarga @devaFollowing;")
calt_lines.append("} calt;")
features.append('\n'.join(calt_lines))
if not features:
return ""
return '\n\n'.join(features)