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authorDavid Herrmann <dh.herrmann@gmail.com>2014-07-18 17:34:03 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2014-07-18 17:45:33 +0200
commit86db5dfb6d334e583ea4161191754522ce850eed (patch)
tree5abc777472cb907b954f63e8523e95dfa494e974 /tools
parent545149a2fc3523bbcbf3703fae3ae1ca5312f8c8 (diff)
terminal: add unifont font-handling
The unifont layer of libsystemd-terminal provides a fallback font for situations where no system-fonts are available, or if you don't want to deal with traditional font-formats for some reasons. The unifont API mmaps a pre-compiled bitmap font that was generated out of GNU-Unifont font-data. This guarantees, that all users of the font will share the pages in memory. Furthermore, the layout of the binary file allows accessing glyph data in O(1) without pre-rendering glyphs etc. That is, the OS can skip loading pages for glyphs that we never access. Note that this is currently a test-run and we want to include the binary file in the GNU-Unifont package. However, until it was considered stable and accepted by the maintainers, we will ship it as part of systemd. So far it's only enabled with the experimental --enable-terminal, anyway.
Diffstat (limited to 'tools')
-rwxr-xr-xtools/compile-unifont.py116
1 files changed, 116 insertions, 0 deletions
diff --git a/tools/compile-unifont.py b/tools/compile-unifont.py
new file mode 100755
index 0000000000..7004b946d2
--- /dev/null
+++ b/tools/compile-unifont.py
@@ -0,0 +1,116 @@
+# -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
+#
+# This file is part of systemd.
+#
+# Copyright 2013-2014 David Herrmann <dh.herrmann@gmail.com>
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# systemd 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
+#
+# Parse a unifont.hex file and produce a compressed binary-format.
+#
+
+from __future__ import print_function
+import re
+import sys
+import fileinput
+import struct
+
+#
+# Write "bits" array as binary output.
+#
+
+def write_bin_entry(entry):
+ l = len(entry)
+ if l != 32 and l != 64:
+ entry = "0" * 64
+ l = 0
+ elif l < 64:
+ entry += "0" * (64 - l)
+
+ sys.stdout.buffer.write(struct.pack('B', int(l / 32))) # width
+ sys.stdout.buffer.write(struct.pack('B', 0)) # padding
+ sys.stdout.buffer.write(struct.pack('H', 0)) # padding
+ sys.stdout.buffer.write(struct.pack('I', 0)) # padding
+
+ i = 0
+ for j in range(0, 16):
+ for k in range(0, 2):
+ if l <= k * 16 * 2:
+ c = 0
+ else:
+ c = int(entry[i:i+2], 16)
+ i += 2
+
+ sys.stdout.buffer.write(struct.pack('B', c))
+
+def write_bin(bits):
+ sys.stdout.buffer.write(struct.pack('B', 0x44)) # ASCII: 'D'
+ sys.stdout.buffer.write(struct.pack('B', 0x56)) # ASCII: 'V'
+ sys.stdout.buffer.write(struct.pack('B', 0x44)) # ASCII: 'D'
+ sys.stdout.buffer.write(struct.pack('B', 0x48)) # ASCII: 'H'
+ sys.stdout.buffer.write(struct.pack('B', 0x52)) # ASCII: 'R'
+ sys.stdout.buffer.write(struct.pack('B', 0x4d)) # ASCII: 'M'
+ sys.stdout.buffer.write(struct.pack('B', 0x55)) # ASCII: 'U'
+ sys.stdout.buffer.write(struct.pack('B', 0x46)) # ASCII: 'F'
+ sys.stdout.buffer.write(struct.pack('<I', 0)) # compatible-flags
+ sys.stdout.buffer.write(struct.pack('<I', 0)) # incompatible-flags
+ sys.stdout.buffer.write(struct.pack('<I', 32)) # header-size
+ sys.stdout.buffer.write(struct.pack('<H', 8)) # glyph-header-size
+ sys.stdout.buffer.write(struct.pack('<H', 2)) # glyph-stride
+ sys.stdout.buffer.write(struct.pack('<Q', 32)) # glyph-body-size
+
+ # write glyphs
+ for idx in range(len(bits)):
+ write_bin_entry(bits[idx])
+
+#
+# Parse hex file into "bits" array
+#
+
+def parse_hex_line(bits, line):
+ m = re.match(r"^([0-9A-Fa-f]+):([0-9A-Fa-f]+)$", line)
+ if m == None:
+ return
+
+ idx = int(m.group(1), 16)
+ val = m.group(2)
+
+ # insert skipped lines
+ for i in range(len(bits), idx):
+ bits.append("")
+
+ bits.insert(idx, val)
+
+def parse_hex():
+ bits = []
+
+ for line in sys.stdin:
+ if not line:
+ continue
+ if line.startswith("#"):
+ continue
+
+ parse_hex_line(bits, line)
+
+ return bits
+
+#
+# In normal mode we simply read line by line from standard-input and write the
+# binary-file to standard-output.
+#
+
+if __name__ == "__main__":
+ bits = parse_hex()
+ write_bin(bits)