1 files changed, 127 insertions, 0 deletions
diff --git a/tools/img2thd72.py b/tools/img2thd72.py
new file mode 100644
index 0000000..407bdf7
--- /dev/null
+++ b/tools/img2thd72.py
@@ -0,0 +1,127 @@
+#!/usr/bin/env python
+# coding=utf-8
+# ex: set tabstop=4 expandtab shiftwidth=4 softtabstop=4:
+#
+# © Copyright Vernon Mauery <vernon@mauery.com>, 2010.  All Rights Reserved
+#
+# This 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 3 of the License, or (at
+# your option) any later version.
+#
+# This sofware 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 this software.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import sys
+import getopt
+from PIL import Image as im
+
+
+def die(msg):
+    print msg
+    sys.exit(1)
+
+
+def thd72bitmap(fname, invert):
+    img = im.open(ifname)
+    if img.size != (120, 48):
+        die("Image has wrong dimensions: must be 120x48")
+
+    colors = img.getcolors()
+    if len(colors) != 2:
+        die("Image must be 1 bits per pixel (black and white)")
+
+    if ('-i', '') in opts:
+        c, black = colors[0]
+        c, white = colors[1]
+    else:
+        c, white = colors[0]
+        c, black = colors[1]
+
+    colors = {black: 1, white: 0}
+    data = img.getdata()
+    buf = ''
+    for y in range(6):
+        for x in range(120):
+            b = 0
+            for i in range(8):
+                b |= colors[data[x + 120 * (y * 8 + i)]] << i
+            buf += chr(b)
+    return buf
+
+
+def display_thd72(buf):
+    dots = {0: '*', 1: ' '}
+    lines = []
+    for y in range(48):
+        line = ''
+        for x in range(120):
+            byte = y/8*120 + x
+            line += dots[(ord(buf[byte]) >> (y % 8)) & 0x01]
+        lines.append(line)
+    for l in lines:
+        print l
+
+
+def usage():
+    print "\nUsage: %s <-s|-g> [-i] [-d] " \
+          "<image-file> <thd72-nvram-file>" % sys.argv[0]
+    print "\nThis program will modify whatever nvram file provided or will"
+    print "create a new one if the file does not exist.  After using this to"
+    print "modify the image, you can use that file to upload all or part of"
+    print "it to your radio"
+    print "\nOption explanations:"
+    print "  -s     Save as the startup image"
+    print "  -g     Save as the GPS logger image"
+    print "  -i     Invert colors (black for white)"
+    print "         Depending on the file format the bits may be inverted."
+    print "         If your bitmap file turns out to be inverted, use -i."
+    print "  -d     Display the bitmap as dots (for confirmation)"
+    print "         Each black pixel is '*' and each white pixel is ' '"
+    print "         This will print up to 120 dots wide, so beware your"
+    print "         terminal size."
+    sys.exit(1)
+
+if __name__ == "__main__":
+    opts, args = getopt.getopt(sys.argv[1:], "idgs")
+    if len(args) != 2:
+        usage()
+    ifname = args[0]
+    ofname = args[1]
+    invert = ('-i', '') in opts
+    gps = ('-g', '') in opts
+    startup = ('-s', '') in opts
+    if (gps and startup) or not (gps or startup):
+        usage()
+    if gps:
+        imgpos = 0xe800
+        tagpos = 18
+    else:
+        imgpos = 0xe500
+        tagpos = 17
+
+    buf = thd72bitmap(ifname, invert)
+    imgfname = ifname + '\xff' * (48-len(ifname))
+    of = file(ofname, "rb+")
+    of.seek(tagpos)
+    of.write('\x01')
+    of.seek(imgpos)
+    of.write(buf)
+    of.write(imgfname)
+    of.seek(65536)
+    of.close()
+
+    if ('-d', '') in opts:
+        display_thd72(buf)
+
+    blocks = [0, ]
+    blocks.append(imgpos/256)
+    blocks.append(1+imgpos/256)
+    blocks.append(2+imgpos/256)
+    print "Modified block list:", blocks