1 files changed, 77 insertions, 0 deletions
diff --git a/bdftruncate.pl b/bdftruncate.pl
new file mode 100644
index 0000000..6c3ca90
--- /dev/null
+++ b/bdftruncate.pl
@@ -0,0 +1,77 @@
+#!/usr/bin/perl
+#
+# bdftruncate.pl -- Markus Kuhn <mkuhn@acm.org>
+#
+# This Perl script allows you to generate from an ISO10646-1 encoded
+# BDF font other ISO10646-1 BDF fonts in which all characters above
+# a threshold code value are stored unencoded.
+#
+# Id: bdftruncate.pl,v 1.5 2001-05-31 10:58:58+01 mgk25 Exp $
+
+# Subroutine to identify whether the ISO 10646/Unicode character code
+# ucs belongs into the East Asian Wide (W) or East Asian FullWidth
+# (F) category as defined in Unicode Technical Report #11.
+sub iswide ($) {
+    my $ucs = shift(@_);
+
+    return ($ucs >= 0x1100 &&
+            ($ucs <= 0x115f ||                   # Hangul Jamo
+             ($ucs >= 0x2e80 && $ucs <= 0xa4cf &&
+              ($ucs & ~0x0011) != 0x300a && $ucs != 0x303f) || # CJK .. Yi
+             ($ucs >= 0xac00 && $ucs <= 0xd7a3) || # Hangul Syllables
+             ($ucs >= 0xf900 && $ucs <= 0xfaff) || # CJK Comp. Ideographs
+             ($ucs >= 0xfe30 && $ucs <= 0xfe6f) || # CJK Comp. Forms
+             ($ucs >= 0xff00 && $ucs <= 0xff5f) || # Fullwidth Forms
+             ($ucs >= 0xffe0 && $ucs <= 0xffe6) ||
+             ($ucs >= 0x20000 && $ucs <= 0x2ffff)));
+}
+
+# parse options
+if ($ARGV[0] eq '-w' || $ARGV[0] eq '+w') {
+    $removewide = $ARGV[0] eq '-w';
+    shift @ARGV;
+}
+
+print STDERR <<End if $#ARGV != 0;
+
+Usage: bdftruncate [+w|-w] threshold <source.bdf >destination.bdf
+
+Example:
+
+   bdftruncate 0x3200 <6x13.bdf >6x13t.bdf
+
+will generate the file 6x13t.bdf in which all glyphs with codes
+>= 0x3200 will only be stored unencoded (i.e., ENCODING -1).
+Option -w removes East Asian Wide and East Asian FullWidth characters
+(default if threshold <= 0x3200), and option +w keeps them.
+
+End
+
+exit 1 if $#ARGV != 0;
+
+# read threshold value from command line
+$threshold = $ARGV[0];
+if ($threshold =~ /^(0[xX]|U[+-]?)([0-9a-fA-F]+)$/) {
+    $threshold = hex($2);
+} elsif (!($threshold =~ /^[0-9]+$/)) {
+    die("Illegal threshold '$threshold'!\n");
+}
+$removewide = $threshold <= 0x3200 unless defined $removewide;
+
+# filter file
+while (<STDIN>) {
+    if (/^ENCODING\s+(-?\d+)/ && 
+	($1 >= $threshold || ($removewide && iswide($1)))) {
+	print "ENCODING -1\n";
+    } elsif (/^STARTFONT/) {
+	print;
+	print "COMMENT AUTOMATICALLY GENERATED FILE. DO NOT EDIT!\n";
+	printf("COMMENT In this version of the font file, all characters >= " .
+	       "U+%04X are\nCOMMENT not encoded to keep XFontStruct small.\n",
+	       $threshold);
+    } else {
+	s/^COMMENT\s+\"(.*)\"$/COMMENT $1/;
+        s/^COMMENT\s+\$[I]d: (.*)\$\s*$/COMMENT Derived from $1\n/;
+	print;
+    }
+}