contrib/epstopng.py

   1 #!/usr/bin/env python
   2 # -*- coding: ISO-8859-1 -*-
   3 #
   4 #
   5 # Copyright (C) 2003 André Wobst <wobsta@users.sourceforge.net>
   6 #
   7 # epstopng is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # epstopng is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with epstopng; if not, write to the Free Software
  19 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20
  21 # TODO: - set dpi in png (don't know how to do this in PIL)
  22 #       - this is much too slow --- consider a rewrite in C
  23
  24
  25 import getopt, sys, os, StringIO, re, math
  26 import Image # we use the python image library (PIL)
  27
  28
  29 progname = "epstopng v0.1: eps to transparent antialiased png converter"
  30
  31
  32 def epstopng(epsname, pngname, resolution, scale, transparent, gsname, quiet):
  33     sys.stderr.write("run ghostscript to create a %i times larger non-antialiased image ... " % scale)
  34     gsout = os.popen("%s -dEPSCrop -dNOPAUSE -dQUIET -dBATCH -sDEVICE=ppmraw -sOutputFile=- -r%i %s" % (gsname, resolution*scale, epsname))
  35     input = Image.open(StringIO.StringIO(gsout.read())).convert("RGB") # ensure rgb here
  36     output = Image.new("RGBA", [(x+scale-1)/scale for x in input.size])
  37     sys.stderr.write("done\n")
  38     sys.stderr.write("image size is %ix%i\n" % output.size)
  39
  40     inputdata = input.getdata() # getdata instead of getpixel leads to about a factor of 2 in running time
  41                                 # similar effect with putdata possible??? (didn't got that running)
  42     inputsizex, inputsizey = input.size
  43     # loop over the small image
  44     for x in range(output.size[0]):
  45         sys.stderr.write("transparent antialias conversion ... %5.2f %%\r" % (x*100.0/output.size[0]))
  46         for y in range(output.size[1]):
  47             # r, g, b: sum of the rgb-values; u: number of non-transparent pixels
  48             r = g = b = u = 0
  49             # loop over the pixels of the large image to be used for pixel (x, y)
  50             for xo in range(x*scale, min((x+1)*scale, inputsizex-1)):
  51                 for yo in range(y*scale, min((y+1)*scale, inputsizey-1)):
  52                     ro, go, bo = inputdata[xo+inputsizex*yo]
  53                     if (ro, go, bo) != transparent:
  54                         r += ro
  55                         g += go
  56                         b += bo
  57                         u += 1
  58             if u:
  59                 output.putpixel((x, y), (r/u, g/u, b/u, (u*255)/(scale*scale)))
  60             else:
  61                 output.putpixel((x, y), (255, 255, 255, 0))
  62     sys.stderr.write("transparent antialias conversion ... done     \n")
  63
  64     output.save(pngname)
  65
  66
  67 def usage():
  68     print progname
  69     print "Copyright (C) 2003 André Wobst <wobsta@users.sourceforge.net>"
  70     print "usage: epstopng [options] <eps-file>"
  71     print "-h, --help: show this help"
  72     print "-q, --quiet: be quiet"
  73     print "-o, --output <file>: output file name; must be set"
  74     print "-r, --resolution <dpi>: resolution; default: 100"
  75     print "-s, --scale <scale>: input scale for antialias; default: 4"
  76     print "-t, --transparent (<r>, <g>, <b>): transparent color; default: (255, 255, 255)"
  77     print "-g, --gsname <name>: name of the gs interpreter (gs version >= 8.0 needed!); default: \"gs\""
  78
  79
  80 def main():
  81     try:
  82         opts, args = getopt.getopt(sys.argv[1:], "hqo:r:s:t:g:", ["help", "quiet", "output", "resolution", "scale", "transparent", "gsname"])
  83     except getopt.GetoptError:
  84         # print help information and exit:
  85         usage()
  86         sys.exit(2)
  87     output = None
  88     resolution = 100
  89     scale = 4
  90     transparent = (255, 255, 255)
  91     gsname = "gs"
  92     quiet = 0
  93     for o, a in opts:
  94         if o in ("-h", "--help"):
  95             usage()
  96             sys.exit()
  97         if o in ("-o", "--output"):
  98             output = a
  99         if o in ("-r", "--resolution"):
 100             resolution = int(a)
 101         if o in ("-s", "--scale"):
 102             scale = int(a)
 103         if o in ("-t", "--transparent"):
 104             m = re.compile(r"\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)\s*$").match(a)
 105             if not m:
 106                 raise RuntimeError("transparent argument does not match")
 107             transparent = [int(x) for x in m.groups()]
 108         if o in ("-g", "--gsname"):
 109             gsname = a
 110     if len(args) == 1:
 111         input = args[0]
 112     elif len(args):
 113         raise RuntimeError("can't handle several input files")
 114     else:
 115         raise RuntimeError("must specify an input file (reading from stdin is not yet supported)")
 116     if output is None:
 117         raise RuntimeError("you must specify an output file name")
 118     if not quiet:
 119         sys.stderr.write(progname + "\n")
 120     epstopng(input, output, resolution, scale, transparent, gsname, quiet)
 121
 122
 123 if __name__ == "__main__":
 124     main()
 125