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+# Generate CJK subfonts from master font.
+# The fonts are created in the current directory.
+#
+# $1: The master font (e.g., `bsmi00lp.ttf').
+# $2: The name stem for the subfonts (e.g., `bsmilp').
+# $3: The subfont definition file, mapping from Unicode to whatever
+# (e.g., `UBig5.sfd', which maps to Big 5).
+#
+# A collection of useful subfont definition files for CJK fonts can be found
+# in the ttf2pk package.
+
+# Copyright (C) 1994-2021 Werner Lemberg <wl@gnu.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program in doc/COPYING; if not, write to the Free
+# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+# MA 02110-1301 USA
+
+if (Strtol($version) < 20071105)
+ Print("Can't use FontForge version before 2007-11-05. Aborting.");
+ Quit(1);
+endif;
+
+if ($argc != 4)
+ Print("usage: [fontforge -script] ", $0, " master-font name-stem SFD-file");
+ Quit(1);
+endif;
+
+Print("Loading ", $1, "...");
+Open($1);
+
+if ($cidfontname != "")
+ CIDFlatten();
+endif;
+
+Reencode("ucs4");
+
+copyright = $copyright \
+ + Chr(10) + Chr(10) \
+ + "Subfont version " \
+ + Strftime("%F", 1, "C") \
+ + ".";
+SetFontNames("", "", "", "", copyright, "");
+
+Print("Ensure third order curves...");
+SetFontOrder(3);
+
+Print("Scaling to PostScript units...");
+ScaleToEm(900, 100);
+
+num_chars = CharCnt();
+count = 0;
+delta = 100;
+
+while (count + delta < num_chars)
+ Print(count, "/", num_chars - 1, ":");
+ Select(count, count + delta);
+
+ Print(" Add extrema...");
+ AddExtrema();
+
+ Print(" Simplifying outlines...");
+ Simplify(0, 2);
+
+ count += delta;
+endloop;
+
+Print(count, "/", num_chars - 1, ":");
+Select(count, num_chars - 1);
+
+Print(" Add extrema...");
+AddExtrema();
+
+Print(" Simplifying outlines...");
+Simplify(0, 2);
+
+SelectAll();
+
+# generate AFM and TFM files, no PS hints, and rounded PS coordinates
+Print("Generating subfonts...");
+Generate($2 + "%s.pfb", "", \
+ 0x1 | 0x100 | 0x10000 | 0x80000 | 0x200000, \
+ -1, $3);
+
+Quit(0);