-Add: tool to extract characters from FNT files

tools/extractfnt.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+# vim: tabstop=4 shiftwidth=4 softtabstop=4 noexpandtab
+#
+# read FNT font files from Dune II
+
+from struct import *
+import sys
+from save_pictures import *
+
+def extract_fnt(filename):
+	with open(filename, 'rb') as fnt_file:
+		fnt = fnt_file.read()
+		(size, sig, params, offsets, width_list, char_data, line_list) = unpack_from('<HHHHHHH', fnt)
+		print filename, size, sig, params, offsets, width_list, char_data, line_list
+		(p1, p2, p3, max_index, height, max_width) = unpack_from('<BBBBBB', fnt, params)
+		#print fnt[params:offsets].encode('hex')
+		print ' ', p1, p2, p3, max_index, height, max_width
+		lines = [''] * height
+		for i in range(max_index + 1):
+			width = ord(fnt[width_list+i])
+			(unused_lines, used_lines) = unpack_from('<BB', fnt, line_list + i * 2)
+			(offset,) = unpack_from('<H', fnt, offsets + i * 2)
+			#print i, width, unused_lines, used_lines, offset
+			for y in range(height):
+				if y < unused_lines or y >= unused_lines + used_lines:
+					line = chr(0) * width
+				else:
+					line = ''
+					for x in range(width):
+						data = ord(fnt[offset])
+						if (x & 1) != 0:
+							data = data >> 4
+						else:
+							data = data & 0x0f
+						line += chr(data)
+						if (x & 1) != 0 or x == width - 1:
+							offset += 1
+				lines[y] += line
+		save_pbm(filename + '.pbm', len(lines[0]), height, ''.join(lines), None)
+
+if len(sys.argv) <= 1:
+	print "usage : %s file.FNT" % sys.argv[0]
+else:
+	args = sys.argv[1:]
+	for filename in args:
+		extract_fnt(filename)