epstopng.py :  » PDF » PyX » PyX-0.10 » contrib » Python Open Source

Home
Python Open Source
1.3.1.2 Python
2.Ajax
3.Aspect Oriented
4.Blog
5.Build
6.Business Application
7.Chart Report
8.Content Management Systems
9.Cryptographic
10.Database
11.Development
12.Editor
13.Email
14.ERP
15.Game 2D 3D
16.GIS
17.GUI
18.IDE
19.Installer
20.IRC
21.Issue Tracker
22.Language Interface
23.Log
24.Math
25.Media Sound Audio
26.Mobile
27.Network
28.Parser
29.PDF
30.Project Management
31.RSS
32.Search
33.Security
34.Template Engines
35.Test
36.UML
37.USB Serial
38.Web Frameworks
39.Web Server
40.Web Services
41.Web Unit
42.Wiki
43.Windows
44.XML
Python Open Source » PDF » PyX 
PyX » PyX 0.10 » contrib » epstopng.py
#!/usr/bin/env python
# -*- coding: ISO-8859-1 -*-
#
#
# Copyright (C) 2003 Andr Wobst <wobsta@users.sourceforge.net>
#
# epstopng is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# epstopng 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with epstopng; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# TODO: - set dpi in png (don't know how to do this in PIL)
#       - this is much too slow --- consider a rewrite in C


import getopt, sys, os, StringIO, re, math
import Image # we use the python image library (PIL)


progname = "epstopng v0.1: eps to transparent antialiased png converter"


def epstopng(epsname, pngname, resolution, scale, transparent, gsname, quiet):
    sys.stderr.write("run ghostscript to create a %i times larger non-antialiased image ... " % scale)
    gsout = os.popen("%s -dEPSCrop -dNOPAUSE -dQUIET -dBATCH -sDEVICE=ppmraw -sOutputFile=- -r%i %s" % (gsname, resolution*scale, epsname))
    input = Image.open(StringIO.StringIO(gsout.read())).convert("RGB") # ensure rgb here
    output = Image.new("RGBA", [(x+scale-1)/scale for x in input.size])
    sys.stderr.write("done\n")
    sys.stderr.write("image size is %ix%i\n" % output.size)

    inputdata = input.getdata() # getdata instead of getpixel leads to about a factor of 2 in running time
                                # similar effect with putdata possible??? (didn't got that running)
    inputsizex, inputsizey = input.size
    # loop over the small image
    for x in range(output.size[0]):
        sys.stderr.write("transparent antialias conversion ... %5.2f %%\r" % (x*100.0/output.size[0]))
        for y in range(output.size[1]):
            # r, g, b: sum of the rgb-values; u: number of non-transparent pixels
            r = g = b = u = 0
            # loop over the pixels of the large image to be used for pixel (x, y)
            for xo in range(x*scale, min((x+1)*scale, inputsizex-1)):
                for yo in range(y*scale, min((y+1)*scale, inputsizey-1)):
                    ro, go, bo = inputdata[xo+inputsizex*yo]
                    if (ro, go, bo) != transparent:
                        r += ro
                        g += go
                        b += bo
                        u += 1
            if u:
                output.putpixel((x, y), (r/u, g/u, b/u, (u*255)/(scale*scale)))
            else:
                output.putpixel((x, y), (255, 255, 255, 0))
    sys.stderr.write("transparent antialias conversion ... done     \n")

    output.save(pngname)


def usage():
    print progname
    print "Copyright (C) 2003 Andr Wobst <wobsta@users.sourceforge.net>"
    print "usage: epstopng [options] <eps-file>"
    print "-h, --help: show this help"
    print "-q, --quiet: be quiet"
    print "-o, --output <file>: output file name; must be set"
    print "-r, --resolution <dpi>: resolution; default: 100"
    print "-s, --scale <scale>: input scale for antialias; default: 4"
    print "-t, --transparent (<r>, <g>, <b>): transparent color; default: (255, 255, 255)"
    print "-g, --gsname <name>: name of the gs interpreter (gs version >= 8.0 needed!); default: \"gs\""


def main():
    try:
        opts, args = getopt.getopt(sys.argv[1:], "hqo:r:s:t:g:", ["help", "quiet", "output", "resolution", "scale", "transparent", "gsname"])
    except getopt.GetoptError:
        # print help information and exit:
        usage()
        sys.exit(2)
    output = None
    resolution = 100
    scale = 4
    transparent = (255, 255, 255)
    gsname = "gs"
    quiet = 0
    for o, a in opts:
        if o in ("-h", "--help"):
            usage()
            sys.exit()
        if o in ("-o", "--output"):
            output = a
        if o in ("-r", "--resolution"):
            resolution = int(a)
        if o in ("-s", "--scale"):
            scale = int(a)
        if o in ("-t", "--transparent"):
            m = re.compile(r"\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)\s*$").match(a)
            if not m:
                raise RuntimeError("transparent argument does not match")
            transparent = [int(x) for x in m.groups()]
        if o in ("-g", "--gsname"):
            gsname = a
    if len(args) == 1:
        input = args[0]
    elif len(args):
        raise RuntimeError("can't handle several input files")
    else:
        raise RuntimeError("must specify an input file (reading from stdin is not yet supported)")
    if output is None:
        raise RuntimeError("you must specify an output file name")
    if not quiet:
        sys.stderr.write(progname + "\n")
    epstopng(input, output, resolution, scale, transparent, gsname, quiet)


if __name__ == "__main__":
    main()

www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.