scripts/makefont.py

   1 #!/usr/bin/python3
   2
   3 caps = [ord(c) for c in "ABCDEFGHIKLMNOPRSTUVWXYZ"]
   4 xchars = [ord(c) for c in "acemnorsuvwxz"]
   5
   6 def convert_def(fn):
   7         src = open(fn)
   8
   9         result = ""
  10         glyphs = {}
  11         metrics = {}
  12         kerning = []
  13         codes = {}
  14         cap_height = []
  15         x_height = []
  16         for line in src.readlines():
  17                 line = line.strip()
  18                 if not line or line[0]=='#':
  19                         continue
  20
  21                 parts = line.split()
  22                 values = tuple(map(int, parts[1:]))
  23
  24                 if parts[0]=="font":
  25                         tw, th, fh, fa, fd = map(int, parts[1:])
  26                         result += "native_size {};\n".format(fh)
  27                         result += "ascent {:.3f};\n".format(float(fa)/fh)
  28                         result += "descent {:.3f};\n".format(float(fd)/fh)
  29                 elif parts[0]=="code":
  30                         c, n = tuple(map(int, parts[1:]))
  31                         codes[c] = n
  32                 elif parts[0]=="metrics":
  33                         metrics[values[0]] = values[1:]
  34                 elif parts[0]=="glyph":
  35                         glyphs[values[0]] = values[1:]
  36                 elif parts[0]=="kern":
  37                         kerning.append(values)
  38
  39         for c, n in codes.items():
  40                 h = metrics[n][1]
  41                 if c in caps:
  42                         cap_height.append(h)
  43                 elif c in xchars:
  44                         x_height.append(h)
  45
  46         if cap_height:
  47                 cap_height.sort()
  48                 result += "cap_height {:.3f};\n".format(float(cap_height[len(cap_height)*2//3])/fh)
  49         if x_height:
  50                 x_height.sort()
  51                 result += "x_height {:.3f};\n".format(float(x_height[len(x_height)*2//3])/fh)
  52
  53         for c, n in codes.items():
  54                 _, _, ox, oy, a = metrics[n]
  55                 x, y, w, h, b = glyphs[n]
  56                 result += "glyph {}\n{{\n".format(c)
  57                 result += "\ttexcoords {} {} {} {};\n".format(float(x)/tw, float(th-y-h)/th, float(x+w)/tw, float(th-y)/th)
  58                 result += "\tsize {:.3f} {:.3f};\n".format(float(w)/fh, float(h)/fh)
  59                 result += "\toffset {:.3f} {:.3f};\n".format(float(ox-b)/fh, float(oy-b)/fh)
  60                 result += "\tadvance {:.3f};\n".format(float(a)/fh)
  61                 result += "};\n"
  62
  63         for k in kerning:
  64                 l, r, d = k
  65                 result += "kerning {} {} {:.3f};\n".format(l, r, float(d)/fh)
  66
  67         return result
  68
  69 def make_font(fn, size, ch_ranges, autohinter, margin, padding, distfield):
  70         import maketex
  71         import os
  72
  73         cmd = "ttf2png \"{}\" -o makefont-tmp.png -d makefont-tmp.def -t -p -s {} -m {} -n {} -g".format(fn, size, margin, padding)
  74         if ch_ranges:
  75                 for r in ch_ranges:
  76                         cmd += " -r {},{}".format(*r)
  77         if autohinter:
  78                 cmd += " -a"
  79         if distfield:
  80                 cmd += " -f {}".format(distfield)
  81         if os.system(cmd):
  82                 raise Exception("Could not execute ttf2png")
  83
  84         result = "texture\n{\n"
  85         result += maketex.make_tex("makefont-tmp.png")
  86         result += "};\n"
  87         result += convert_def("makefont-tmp.def")
  88
  89         os.unlink("makefont-tmp.png")
  90         os.unlink("makefont-tmp.def")
  91
  92         return result
  93
  94 def parse_range(s):
  95         return tuple(map(int, s.split(',', 1)))
  96
  97 if __name__=="__main__":
  98         import sys
  99         import argparse
 100
 101         parser = argparse.ArgumentParser()
 102         parser.add_argument("-s", "--size", default=10, type=int, metavar="NUM", help="Font size in pixels")
 103         parser.add_argument("-a", "--autohinter", action="store_const", const=True, default=False, help="Force autohinter")
 104         parser.add_argument("-m", "--margin", default=0, type=int, metavar="NUM", help="Margin around image edge in pixels")
 105         parser.add_argument("-n", "--padding", default=1, type=int, metavar="NUM", help="Padding between glyphs in pixels")
 106         parser.add_argument("-r", "--range", action="append", type=parse_range, metavar="START,END", help="Range of code points to include")
 107         parser.add_argument("-f", "--distfield", default=0, type=int, metavar="NUM", help="Produce a distance field texture")
 108         parser.add_argument("ttf", metavar="font.ttf", help="TrueType file to read")
 109         parser.add_argument("outfile", help="MspGL font file to write")
 110
 111         args = parser.parse_args()
 112
 113         out = open(args.outfile, "w")
 114         out.write(make_font(args.ttf, args.size, args.range, args.autohinter, args.margin, args.padding, args.distfield))