Added bitmap font generator

font/characters16.txt

@@ -0,0 +1 @@
+0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.:!?+-*/=

font/convert.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+
+from PIL import Image
+import sys
+
+if len(sys.argv) < 3:
+    print("usage: {} <bitmap> <characters> <output>")
+    exit(1)
+
+inputfile = sys.argv[1]
+charfile = sys.argv[2]
+outputfile = sys.argv[3]
+
+im = Image.open(inputfile)
+
+cols, rows = im.size
+
+offset = 4 # hardcoded 'space'
+startpos = offset
+
+fixedwidth = 9
+
+charpos = [0]              # hardcoded 'space'
+chardata = [0x00] * offset # hardcoded 'space'
+charwidth = [offset]       # hardcoded 'space'
+
+for col in range(cols):
+    coldata = 0
+
+    for row in range(rows):
+        px = 0 if im.getpixel( (col, row) ) else 1
+        coldata |= (px << row)
+
+    print("{:016b}".format(coldata))
+
+    width = offset - startpos
+
+    chardata.append(coldata)
+
+    if width == fixedwidth:
+        charpos.append(startpos)
+        charwidth.append(width)
+        startpos = offset
+    else:
+        offset += 1
+
+dataarray = ", ".join([hex(n) for n in chardata])
+posarray = ", ".join([str(n) for n in charpos])
+widtharray = ", ".join([str(n) for n in charwidth])
+
+asciimap = [0 for i in range(256)]
+
+with open(charfile, "r") as cfile:
+    s = " " + cfile.read().strip()
+    for i in range(len(s)):
+        asciimap[ord(s[i])] = i
+
+asciimaparray = ", ".join([str(n) for n in asciimap])
+
+with open(outputfile, "w") as ofile:
+    ofile.write("""
+#include "font16_data.h"
+
+const uint16_t font_data[{}] = {{ {} }};
+const uint16_t font_pos[{}] = {{ {} }};
+const uint8_t font_width[{}] = {{ {} }};
+
+const uint8_t font_lut[256] = {{ {} }};
+
+const uint8_t font_height = {};
+""".format(len(chardata), dataarray, len(charpos), posarray, len(charwidth), widtharray, asciimaparray, rows))