| 1 | #!/usr/bin/perl -w |
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| 2 | |
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| 3 | # afm2txf.pl 0.2 |
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| 4 | # |
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| 5 | # Generates .txf font textures from Type 1 fonts |
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| 6 | # Requirements: Ghostscript, ImageMagick |
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| 7 | # |
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| 8 | # Usage: |
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| 9 | # afm2txf.pl [-o OUTPUT.txf] whatever.afm |
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| 10 | # |
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| 11 | # Changelog: |
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| 12 | # 0.2 (06/28/2002): Generate fonts with proper padding |
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| 13 | # 0.1 (06/28/2002): Initial version |
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| 14 | # |
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| 15 | # Copyright (C) 2002 Andrew James Ross |
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| 16 | # Copyright (C) 2010,2011 Olly Betts |
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| 17 | # |
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| 18 | # This program is free software; you can redistribute it and/or modify |
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| 19 | # it under the terms of the GNU General Public License version 2 as |
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| 20 | # published by the Free Software Foundation. |
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| 21 | |
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| 22 | use strict; |
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| 23 | |
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| 24 | my $output; |
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| 25 | if (scalar @ARGV >= 1) { |
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| 26 | my $arg = $ARGV[0]; |
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| 27 | if ($arg =~ s/^-o//) { |
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| 28 | shift; |
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| 29 | if ($arg eq '') { |
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| 30 | if (scalar @ARGV == 0) { |
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| 31 | die "-o needs an argument\n"; |
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| 32 | } |
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| 33 | $output = shift; |
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| 34 | } else { |
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| 35 | $output = $arg; |
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| 36 | } |
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| 37 | } |
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| 38 | } |
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| 39 | |
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| 40 | my $METRICS = shift or die; # AFM file |
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| 41 | |
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| 42 | # Texture size |
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| 43 | my $TEXSIZ = 256; |
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| 44 | |
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| 45 | # Padding around each character, for mipmap separation |
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| 46 | my $PADDING = 4; |
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| 47 | |
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| 48 | # Antialiasing multiplier. Should be 16 for production work. As low |
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| 49 | # as 4 works well for testing. |
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| 50 | my $DOWNSAMPLE = 16; |
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| 51 | |
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| 52 | # The printable ISO-8859-1 characters (and space and hard space) and their |
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| 53 | # postscript glyph names. We use names because not all postscript |
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| 54 | # fonts are encoded using ASCII. AFM metrics generated by ttf2afm, in |
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| 55 | # fact, don't have any numerical character IDs at all. In principle, |
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| 56 | # this mechanism will work for any 8 bit font encoding, you just have |
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| 57 | # to do the legwork of figuring out the name to ID mapping. |
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| 58 | my %REVCHARS = (32=>'space', 33=>'exclam', 34=>'quotedbl', |
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| 59 | 35=>'numbersign', 36=>'dollar', 37=>'percent', |
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| 60 | 38=>'ampersand', 39=>'quotesingle', 40=>'parenleft', |
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| 61 | 41=>'parenright', 42=>'asterisk', 43=>'plus', |
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| 62 | 44=>'comma', 45=>'hyphen', 46=>'period', 47=>'slash', |
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| 63 | 48=>'zero', 49=>'one', 50=>'two', 51=>'three', |
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| 64 | 52=>'four', 53=>'five', 54=>'six', 55=>'seven', |
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| 65 | 56=>'eight', 57=>'nine', 58=>'colon', 59=>'semicolon', |
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| 66 | 60=>'less', 61=>'equal', 62=>'greater', 63=>'question', |
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| 67 | 64=>'at', 65=>'A', 66=>'B', 67=>'C', 68=>'D', 69=>'E', |
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| 68 | 70=>'F', 71=>'G', 72=>'H', 73=>'I', 74=>'J', 75=>'K', |
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| 69 | 76=>'L', 77=>'M', 78=>'N', 79=>'O', 80=>'P', 81=>'Q', |
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| 70 | 82=>'R', 83=>'S', 84=>'T', 85=>'U', 86=>'V', 87=>'W', |
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| 71 | 88=>'X', 89=>'Y', 90=>'Z', 91=>'bracketleft', |
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| 72 | 92=>'backslash', 93=>'bracketright', 94=>'asciicircum', |
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| 73 | 95=>'underscore', 96=>'quoteleft', 97=>'a', 98=>'b', 99=>'c', |
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| 74 | 100=>'d', 101=>'e', 102=>'f', 103=>'g', 104=>'h', |
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| 75 | 105=>'i', 106=>'j', 107=>'k', 108=>'l', 109=>'m', |
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| 76 | 110=>'n', 111=>'o', 112=>'p', 113=>'q', 114=>'r', |
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| 77 | 115=>'s', 116=>'t', 117=>'u', 118=>'v', 119=>'w', |
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| 78 | 120=>'x', 121=>'y', 122=>'z', 123=>'braceleft', |
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| 79 | 124=>'bar', 125=>'braceright', 126=>'asciitilde', |
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| 80 | 160=>'space', 161=>'exclamdown', 162=>'cent', 163=>'sterling', |
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| 81 | 164=>'currency', 165=>'yen', 166=>'brokenbar', 167=>'section', |
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| 82 | 168=>'dieresis', 169=>'copyright', 170=>'ordfeminine', 171=>'guillemotleft', |
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| 83 | 172=>'logicalnot', 173=>'hyphen', 174=>'registered', 175=>'macron', |
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| 84 | 176=>'degree', 177=>'plusminus', 178=>'twosuperior', 179=>'threesuperior', |
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| 85 | 180=>'acute', 181=>'mu', 182=>'paragraph', 183=>'bullet', |
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| 86 | 184=>'cedilla', 185=>'onesuperior', 186=>'ordmasculine', 187=>'guillemotright', |
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| 87 | 188=>'onequarter', 189=>'onehalf', 190=>'threequarters', 191=>'questiondown', |
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| 88 | 192=>'Agrave', 193=>'Aacute', 194=>'Acircumflex', 195=>'Atilde', |
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| 89 | 196=>'Adieresis', 197=>'Aring', 198=>'AE', 199=>'Ccedilla', |
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| 90 | 200=>'Egrave', 201=>'Eacute', 202=>'Ecircumflex', 203=>'Edieresis', |
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| 91 | 204=>'Igrave', 205=>'Iacute', 206=>'Icircumflex', 207=>'Idieresis', |
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| 92 | 208=>'Eth', 209=>'Ntilde', 210=>'Ograve', 211=>'Oacute', |
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| 93 | 212=>'Ocircumflex', 213=>'Otilde', 214=>'Odieresis', 215=>'multiply', |
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| 94 | 216=>'Oslash', 217=>'Ugrave', 218=>'Uacute', 219=>'Ucircumflex', |
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| 95 | 220=>'Udieresis', 221=>'Yacute', 222=>'Thorn', 223=>'germandbls', |
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| 96 | 224=>'agrave', 225=>'aacute', 226=>'acircumflex', 227=>'atilde', |
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| 97 | 228=>'adieresis', 229=>'aring', 230=>'ae', 231=>'ccedilla', |
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| 98 | 232=>'egrave', 233=>'eacute', 234=>'ecircumflex', 235=>'edieresis', |
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| 99 | 236=>'igrave', 237=>'iacute', 238=>'icircumflex', 239=>'idieresis', |
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| 100 | 240=>'eth', 241=>'ntilde', 242=>'ograve', 243=>'oacute', |
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| 101 | 244=>'ocircumflex', 245=>'otilde', 246=>'odieresis', 247=>'divide', |
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| 102 | 248=>'oslash', 249=>'ugrave', 250=>'uacute', 251=>'ucircumflex', |
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| 103 | 252=>'udieresis', 253=>'yacute', 254=>'thorn', 255=>'ydieresis' |
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| 104 | ); |
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| 105 | |
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| 106 | my %CHARS; |
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| 107 | while (my ($k, $v) = each %REVCHARS) { |
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| 108 | $CHARS{$v} = $k unless exists $CHARS{$v}; |
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| 109 | } |
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| 110 | |
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| 111 | my %metrics = (); |
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| 112 | my %positions = (); |
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| 113 | |
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| 114 | # |
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| 115 | # Parse the font metrics. This is a 5 element array. All numbers are |
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| 116 | # expressed as a fraction of the line spacing. |
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| 117 | # 0: nominal width (distance to the next character) |
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| 118 | # 1, 2: Coordinates of the lower left corner of the bounding box, |
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| 119 | # relative to the nominal position. |
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| 120 | # 3, 4: Size of the bounding box |
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| 121 | # |
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| 122 | print STDERR "Reading font metrics...\n"; |
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| 123 | my $FONT; |
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| 124 | open METRICS, '<', $METRICS or die $!; |
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| 125 | my $m; |
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| 126 | while (defined($m = <METRICS>)) { |
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| 127 | if ($m =~ /^FontName (\S*)/) { $FONT = $1; next; } |
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| 128 | next unless $m =~ /^C /; |
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| 129 | chomp $m; |
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| 130 | |
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| 131 | die "No name: $m" if $m !~ /N\s+([^\s]+)\s+;/; |
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| 132 | my $name = $1; |
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| 133 | |
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| 134 | die "No box: $m" |
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| 135 | if $m !~ /B\s+([-0-9]+)\s+([-0-9]+)\s+([-0-9]+)\s+([-0-9]+)\s+;/; |
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| 136 | my ($left, $bottom, $right, $top) = ($1/1000, $2/1000, $3/1000, $4/1000); |
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| 137 | |
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| 138 | die "No width: $m" if $m !~ /WX\s+([-0-9]+)/; |
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| 139 | my $nomwid = $1/1000; # nominal, not physical width! |
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| 140 | |
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| 141 | # The coordinates of the corner relative to the character |
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| 142 | # "position" |
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| 143 | my ($x, $y) = (-$left, -$bottom); |
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| 144 | my ($w, $h) = ($right-$left, $top-$bottom); |
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| 145 | |
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| 146 | $metrics{$name} = [$nomwid, $x, $y, $w, $h]; |
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| 147 | } |
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| 148 | close METRICS; |
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| 149 | |
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| 150 | die "No FontName found in metrics" if not defined $FONT; |
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| 151 | |
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| 152 | # Sanitise $FONT. |
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| 153 | $FONT =~ s!/!_!g; |
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| 154 | |
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| 155 | # |
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| 156 | # Find the height of the tallest character, and print some warnings |
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| 157 | # |
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| 158 | my $maxhgt = 0; |
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| 159 | foreach my $c (keys %CHARS) { |
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| 160 | if(!defined $metrics{$c}) { |
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| 161 | print STDERR "% WARNING: no metrics for char $c. Skipping.\n"; |
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| 162 | next; |
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| 163 | } |
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| 164 | if($metrics{$c}->[4] > $maxhgt) { $maxhgt = $metrics{$c}->[4]; } |
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| 165 | } |
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| 166 | if($maxhgt == 0) { |
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| 167 | print STDERR "No usable characters found. Bailing out.\n"; |
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| 168 | exit 1; |
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| 169 | } |
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| 170 | |
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| 171 | # |
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| 172 | # Do the layout. Keep increasing the row count until the characters |
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| 173 | # just fit. This isn't terribly elegant, but it's simple. |
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| 174 | # |
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| 175 | print STDERR "Laying out"; |
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| 176 | my $rows = 1; |
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| 177 | my $PS; |
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| 178 | my $LINEHGT; |
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| 179 | while(!defined ($PS = genPostscript($rows))) { $rows++; } |
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| 180 | print STDERR " ($rows rows)\n"; |
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| 181 | |
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| 182 | # |
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| 183 | # Call ghostscript to render |
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| 184 | # |
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| 185 | print STDERR "Rendering Postscript...\n"; |
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| 186 | my $res = $TEXSIZ * $DOWNSAMPLE; |
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| 187 | my $pid = open PS, "|gs -r$res -g${res}x${res} -sDEVICE=ppm -sOutputFile=\Q$FONT\E.ppm > /dev/null"; |
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| 188 | die "Couldn't spawn ghostscript interpreter" if !defined $pid; |
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| 189 | foreach (@$PS) { |
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| 190 | print PS "$_\n"; |
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| 191 | } |
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| 192 | close PS; |
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| 193 | waitpid($pid, 0); |
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| 194 | |
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| 195 | # |
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| 196 | # Downsample with ImageMagick |
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| 197 | # |
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| 198 | print STDERR "Antialiasing image...\n"; |
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| 199 | system("mogrify -geometry ${TEXSIZ}x${TEXSIZ} \Q$FONT\E.ppm") == 0 |
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| 200 | or die "Couldn't rescale $FONT.ppm"; |
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| 201 | |
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| 202 | # |
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| 203 | # Generate the .txf file |
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| 204 | # |
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| 205 | print STDERR "Generating textured font file...\n"; |
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| 206 | |
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| 207 | # Prune undefined glyphs |
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| 208 | foreach my $c (keys %metrics) { |
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| 209 | delete $metrics{$c} if !defined $CHARS{$c}; |
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| 210 | } |
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| 211 | |
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| 212 | #sub round { $_[0] > 0 ? int($_[0] + 0.5) : int($_[0] - 0.5) } |
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| 213 | # Bias rounding of positives numbers to be upwards for better spacing. |
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| 214 | # FIXME: sort out the spacing properly - this is just a kludge. |
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| 215 | sub round { $_[0] > 0 ? int($_[0] + 0.9) : int($_[0] - 0.5) } |
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| 216 | $output = "$FONT.txf" unless defined $output; |
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| 217 | open TXF, '>', $output or die; |
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| 218 | print TXF pack "V", 0x667874ff; |
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| 219 | print TXF pack "V", 0x12345678; |
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| 220 | print TXF pack "V", 0; |
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| 221 | print TXF pack "V", $TEXSIZ; |
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| 222 | print TXF pack "V", $TEXSIZ; |
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| 223 | print TXF pack "V", round($TEXSIZ * $LINEHGT); |
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| 224 | print TXF pack "V", 0; |
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| 225 | my @chars = sort keys %REVCHARS; |
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| 226 | print TXF pack "V", scalar @chars; |
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| 227 | foreach my $c (@chars) { |
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| 228 | my $name = $REVCHARS{$c}; |
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| 229 | my $m = $metrics{$name}; |
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| 230 | my $p = $positions{$name}; |
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| 231 | my $step = round($m->[0] * $LINEHGT * $TEXSIZ); |
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| 232 | |
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| 233 | # Pad the bounding box, to handle areas that outside. This can |
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| 234 | # happen due to thick lines in the font path, or be an artifact of |
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| 235 | # the downsampling. |
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| 236 | my ($w, $h, $xoff, $yoff, $x, $y); |
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| 237 | if ($m->[3] == 0 && $m->[4] == 0) { |
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| 238 | $w = $h = $xoff = $yoff = $x = $y = 0; |
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| 239 | } else { |
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| 240 | $w = round($m->[3] * $LINEHGT * $TEXSIZ + 2*$PADDING); |
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| 241 | $h = round($m->[4] * $LINEHGT * $TEXSIZ + 2*$PADDING); |
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| 242 | $xoff = -round($m->[1] * $LINEHGT * $TEXSIZ) - $PADDING; |
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| 243 | $yoff = -round($m->[2] * $LINEHGT * $TEXSIZ) - $PADDING; |
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| 244 | $x = round($p->[0] * $TEXSIZ - $PADDING); |
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| 245 | $y = round($p->[1] * $TEXSIZ - $PADDING); |
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| 246 | } |
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| 247 | print TXF pack "v", $c; |
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| 248 | print TXF pack "C", $w; |
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| 249 | print TXF pack "C", $h; |
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| 250 | print TXF pack "c", $xoff; |
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| 251 | print TXF pack "c", $yoff; |
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| 252 | print TXF pack "C", $step; |
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| 253 | print TXF pack "C", 0; |
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| 254 | print TXF pack "v", $x; |
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| 255 | print TXF pack "v", $y; |
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| 256 | } |
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| 257 | |
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| 258 | # Read in the .ppm file, dump the duplicate color values (ghostscript |
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| 259 | # won't generate pgm's) and write to the end of the .txf. Remember to |
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| 260 | # swap the order of the rows; OpenGL textures are bottom-up. |
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| 261 | open PPM, "$FONT.ppm" or die; |
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| 262 | my $pixel; |
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| 263 | foreach my $r (1 .. $TEXSIZ) { |
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| 264 | seek PPM, -3*$r*$TEXSIZ, 2 or die; |
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| 265 | foreach (1 .. $TEXSIZ) { |
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| 266 | read PPM, $pixel, 3 or die; |
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| 267 | print TXF substr($pixel, 0, 1); |
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| 268 | } |
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| 269 | } |
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| 270 | close PPM; |
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| 271 | close TXF; |
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| 272 | |
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| 273 | # Clean up |
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| 274 | unlink("$FONT.ppm"); |
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| 275 | |
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| 276 | ######################################################################## |
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| 277 | ######################################################################## |
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| 278 | ######################################################################## |
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| 279 | |
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| 280 | # Put the digits first to help ensure they are all on the same line in the |
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| 281 | # texture and will exactly align vertically when rendered - a slight |
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| 282 | # discrepancy here is particularly visible in the colour key legends and |
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| 283 | # compass bearing. |
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| 284 | sub render_order { |
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| 285 | my $a = $CHARS{$a}; |
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| 286 | my $b = $CHARS{$b}; |
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| 287 | my $a_dig = chr($a) =~ /\d/; |
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| 288 | my $b_dig = chr($b) =~ /\d/; |
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| 289 | if ($a_dig ^ $b_dig) { |
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| 290 | return $a_dig ? -1 : 1; |
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| 291 | } |
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| 292 | return $a <=> $b; |
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| 293 | } |
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| 294 | |
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| 295 | sub genPostscript { |
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| 296 | my $rows = shift; |
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| 297 | my $rowhgt = 1/$rows; |
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| 298 | |
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| 299 | my @PS = (); |
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| 300 | |
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| 301 | # The canonical "point size" number, in texture space |
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| 302 | $LINEHGT = ($rowhgt - 2*$PADDING/$TEXSIZ) / $maxhgt; |
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| 303 | |
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| 304 | # Get to where we want. Draw the whole thing in a 1 inch square at |
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| 305 | # the bottom left of the "page". |
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| 306 | push @PS, "72 72 scale"; |
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| 307 | |
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| 308 | # Fill the square with black |
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| 309 | push @PS, "0 setgray"; |
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| 310 | push @PS, "-1 -1 moveto"; |
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| 311 | push @PS, "-1 1 lineto 1 1 lineto 1 -1 lineto"; |
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| 312 | push @PS, "closepath"; |
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| 313 | push @PS, "fill"; |
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| 314 | |
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| 315 | # Draw in white |
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| 316 | push @PS, "1 setgray"; |
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| 317 | |
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| 318 | # Generate our PUSH @PS, font |
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| 319 | push @PS, "/$FONT findfont $LINEHGT scalefont setfont"; |
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| 320 | |
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| 321 | my $x = $PADDING/$TEXSIZ; |
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| 322 | my $y = 1 - $rowhgt + $PADDING/$TEXSIZ; |
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| 323 | my @chars = sort render_order (keys %CHARS); |
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| 324 | foreach my $c (@chars) { |
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| 325 | next if $c eq 'space'; |
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| 326 | my $m = $metrics{$c}; |
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| 327 | next if !defined $m; |
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| 328 | |
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| 329 | # No space? |
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| 330 | my $w = $m->[3]*$LINEHGT; |
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| 331 | if($x + $w + $PADDING/$TEXSIZ > 1) { |
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| 332 | $x = $PADDING/$TEXSIZ; |
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| 333 | $y -= $rowhgt; |
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| 334 | return undef if $y < 0; |
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| 335 | } |
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| 336 | |
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| 337 | # Record where in the texture the box ended up |
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| 338 | $positions{$c} = [$x, $y]; |
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| 339 | |
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| 340 | my $vx = $x + $m->[1]*$LINEHGT; |
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| 341 | my $vy = $y + $m->[2]*$LINEHGT; |
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| 342 | |
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| 343 | push @PS, "$vx $vy moveto"; |
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| 344 | push @PS, "/$c glyphshow"; |
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| 345 | |
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| 346 | # Next box... |
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| 347 | $x += $w + 2*$PADDING/$TEXSIZ; |
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| 348 | } |
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| 349 | |
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| 350 | push @PS, "showpage"; |
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| 351 | |
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| 352 | return \@PS; |
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| 353 | } |
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