From: Ben Harris <bjh21@bjh21.me.uk>
Date: Fri, 22 Nov 2024 14:17:55 +0000 (+0000)
Subject: Note what the various Unicode-range and code-page bits in 'OS/2' mean
X-Git-Tag: bedstead-3.246~3
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=e06dad55790d8ffb270c836927186efd8aedd771;p=bedstead.git

Note what the various Unicode-range and code-page bits in 'OS/2' mean

I haven't actually checked whether they're right, though.
---

diff --git a/bedstead.c b/bedstead.c
index 9cae918..cf9c46a 100644
--- a/bedstead.c
+++ b/bedstead.c
@@ -3039,7 +3039,45 @@ main(int argc, char **argv)
 	TTXI("yStrikeoutPosition", 3 * YPIX);
 	TTXI("sFamilyClass", 0x080a); /* Sans-serif / Matrix */
 	dopanose();
-	/* XXX These were generated by FontForge and should be checked. */
+	/*
+	 * Unicode ranges that are considered "functional" in this
+	 * font.  XXX These are currently the ones chosen by FontForge
+	 * and should be checked. XXX
+	 *
+	 * The set bits correspond with:
+	 * 0: Basic Latin
+	 * 1: Latin-1 Supplement
+	 * 2: Latin Extended-A
+	 * 3: Latin Extended-B
+	 * 4: IPA Extensions + Phonetic Extensions + Supplement
+	 * 5: Spacing Modifier Letters
+	 * 7: Greek and Coptic
+	 * 9: Cyrillic + Supplement + Extended-A + -B
+	 * 11: Hebrew
+	 * 29: Latin Extended Additional + -C + -D
+	 * 31: General Punctuation + Supplemental Punctuation
+	 * 32: Superscripts and Subscripts
+	 * 33: Currency Symbols
+	 * 35: Letterlike Symbols
+	 * 36: Number Forms
+	 * 37: Arrows + Supplemental Arrows-A + -B + Misc Symbols and Arrows
+	 * 38: Mathematical Operators + Supp + Misc -A + -B
+	 * 39: Miscellaneous Technical
+	 * 40: Control Pictures
+	 * 43: Box Drawing
+	 * 44: Block Elements
+	 * 45: Geometric Shapes
+	 * 46: Miscellaneous Symbols
+	 * 47: Dingbats
+	 * 57: Non-Plane 0 (any at all, need not be "functional")
+	 * 60: Private Use Area (plane 0)
+	 * 62: Alphabetic Presentation Forms
+	 * 68: Halfwidth and Fullwidth Forms
+	 * 69: Specials
+	 * 88: Byzantine Musical Symbols + Musical Symbols + Ancient Greek Musical Notation
+	 * 89: Mathematical Alphanumeric Symbols
+	 * 105: Shavian
+	 */
 	TTXS("ulUnicodeRange1", "10100000 00000000 00001010 10111111");
 	TTXS("ulUnicodeRange2", "01010010 00000000 11111001 11111011");
 	TTXS("ulUnicodeRange3", "00000011 00000000 00000000 00110000");
@@ -3056,7 +3094,34 @@ main(int argc, char **argv)
 	TTXI("sTypoLineGap", 0);
 	TTXI("usWinAscent", ASCENT * YPIX);
 	TTXI("usWinDescent", DESCENT * YPIX);
-	/* XXX These were generated by FontForge and should be checked. */
+	/*
+	 * Code ranges that are considered "functional" in this
+	 * font.  XXX These are currently the ones chosen by FontForge
+	 * and should be checked. XXX
+	 *
+	 * The set bits correspond with:
+	 * 0:  CP1252 Latin 1
+	 * 1:  CP1250 Latin 2: Eastern Europe
+	 * 2:  CP1251 Cyrillic
+	 * 3:  CP1253 Greek
+	 * 4:  CP1254 Turkish
+	 * 5:  CP1255 Hebrew
+	 * 29: Macintosh Character Set (US Roman)
+	 * 30: OEM Character Set
+	 * 48: CP869 IBM Greek
+	 * 49: CP866 MS-DOS Russian
+	 * 50: CP865 MS-DOS Nordic
+	 * 52: CP863 MS-DOS Canadian French
+	 * 53: CP862 Hebrew
+	 * 54: CP861 MS-DOS Icelandic
+	 * 55: CP860 MS-DOS Portuguese
+	 * 56: CP857 IBM Turkish
+	 * 57: CP855 IBM Cyrillic; primarily Russian
+	 * 58: CP852 Latin 2
+	 * 60: CP737 Greek; former 437 G
+	 * 62: CP850 WE/Latin 1
+	 * 63: CP437 US
+	 */
 	TTXS("ulCodePageRange1", "01100000 00000000 00000000 00111111");
 	TTXS("ulCodePageRange2", "11010111 11110111 00000000 00000000");
 	TTXI("sxHeight", XHEIGHT * YPIX);