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Diffstat (limited to 'Master/texmf-dist/doc/fonts/ly1/texnansi.txt')
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diff --git a/Master/texmf-dist/doc/fonts/ly1/texnansi.txt b/Master/texmf-dist/doc/fonts/ly1/texnansi.txt new file mode 100644 index 00000000000..761e44ad29e --- /dev/null +++ b/Master/texmf-dist/doc/fonts/ly1/texnansi.txt @@ -0,0 +1,142 @@ +=============================================================== + Design principles of `texnansi.vec': +=============================================================== + +* Make all 228 glyphs in typical plain vanilla text fonts accessible. + (Avoid need for second copy of font with different encoding) + +* Provide access to `extra' f-ligatures (ff, ffi, ffl) and dotlessj + if the font has these. + +* Make 58 accented / composite `standard' characters directly accessible + (so don't have to use TeX's \accent mechanism - improved hyphenation) + +* Follow ISO Latin 1 in 160 - 255 range --- which matches Windows ANSI. + (And matches Cork T1 encoding for accented characters in 192 - 255) + +* Fill in from Windows ANSI in 128 -- 159 range + (which means one can use a Windows editor for the source file) + +* Have special characters where plain TeX (OT1) has them hard-wired. + (ae, oe, oslash, AE, OE, Oslash, germandbls) + +* Have accents (grave, acute, caron, breve. macron, ring, cedilla, + circumflex, tilde, dieresis) mostly where plain TeX (OT1) has them + hard-wired. + +* Follow `TeX typewriter' in 32 -- 127 as much as reasonable + (so verbatim environment works as expected) + +* Fortunately, glyphs accessed only via ligature mechanism in TFM can + be anywhere: ff/fi/fl/ffi/ffl + exclamdown/questiondown, quotedblleft/quotedblright, endash/emdash + +* Avoid character codes 0, 9, 10, 13, and perhaps 127, since much brain + dead software has trouble with those. + +We use `control characters' (0 -- 31 and 127), since we need space for more +than 224 slots, and since we want to match some aspects of `TeX typewriter'. + +Overall layout: + +0 Avoid since some buggy software uses null-terminated string ops + +4 -- 8 `fraction', `dotaccent', `hungarumlaut', `ogonek', `fl' + +9 Avoid (tab - which is treated as white space by some software) + +10 Avoid - some applications have hard-wired for `newline' + +11 -- 12 ff, fi could actually be anywhere (accessed via ligs) + +13 Avoid - some applications have hard-wired for `return' + +14 -- 15 ffi, ffl could actually be anywhere (accessed via ligs) + +16 -- 17 dotlessi/dotlessj \i, \j + +18 -- 24 grave/acute/caron/breve/macron/ring/cedilla accents. + Some accents occur again higher up: + (96), 180, *, *, 175, *, 184 + +25 -- 31 germandbls/ae/oe/oslash/AE/OE/Oslash. + All special characters occur again higher up: + 223, 230, 156, 248, 198, 140, 216 + +32 space. Any sane font should have this! And have it here! + +% NO: 34 quotedblright (148) keep: quotedbl + +39 quoteright (146) *not* quotesingle + +% NO: 60 exclamdown (161) keep: less + +% NO: 62 questiondown (191) keep: greater + +NOTE: exclamdown and questiondown can go anywhere (via pseudo ligature) + +% NO: 92 quotedblleft (147) keep: backslash + +NOTE: quotedblleft and quotedblright can go anywhere (via pseudo ligature) + +94 circumflex (136) *not* asciicircum + +% NO: 95 dotaccent (*) keep: underscore + +96 quoteleft (145) *not* grave accent + +% NO: 123 endash (150) keep: braceleft +% NO: 124 emdash (151) keep: bar + +NOTE: endash/emdash can go anywhere (via pseudo ligature) + +% NO: 125 hungarumlaut (*) keep: braceright + +126 tilde (152) *not* asciitilde +127 dieresis (168) but use the one in 168 instead + +So we have displaced 5 characters (out of 12 possibles) from Windows ANSI: + + quotesingle (39), asciicircum (94), asciitilde (126), + underscore (95), grave (96). + +but not: quotedbl (34), less (60), greater (62), +but not: backslash (92), bar (124), braceleft (123), braceright (125) + +The five above then need to be patched in higher up. + +Conversely, we have moved down from Windows ANSI accents and special chars: + + grave (96), acute (180), macron (175), cedilla (184), + circumflex (136), tilde (152), dieresis (168), + quoteleft (145), quoteright (146), + germandbls (223), ae (230), oe (156), oslash (248), + AE (198), OE (140), Oslash (216). + +but not: quotedblleft (147), quotedblright (148), +but not: exclamdown (161), questiondown (191) +but not: endash (150), emdash (151), + +(This opens up some slots higher up that could be filled with other things). + +There are eight gaps in Windows ANSI: 128, 129, 141, 142, 143, 144, 157, 158, +we need four for characters displaced from lower down: + + quotesingle (39), asciicircum (94), asciitilde (126), grave (96), + +Actually, we can omit grave, because it appears at 18 now. + +Finally, fill in the gaps, and adding minus, Lslash, lslash, Zcaron, zcaron + +128 Lslash +129 quotesingle + +141 Zcaron +142 asciicircum +143 minus +144 lslash + +157 zcaron +158 asciitilde + +The rest (160 and above) is ISO Latin 1 / Windows ANSI
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