# $Id$
# render powerpoint slides for use with s5maker (work in progress)

# to run this, you need PIL and the pilwmf extension; you can get
# both from http://effbot.org/downloads

# usage:
#
# first (but optional), make a copy of your powerpoint presentation,
# and remove headers and footers, etc.
#
# then save the presentation as "windows meta files..." to a suitable
# directory
#
# finally, run this script on that directory to get a bunch of image
# files, and a TXT file that you can use with s5maker.py.
#
# you'll probably want to add proper tiles to the TXT file, before you
# show it to anyone else.

import glob, os, re, sys
import traceback

import Image

import WmfImagePlugin
import WmfPlugin

force = 0

width = 800
height = 600

presentation = os.path.basename(sys.argv[1])

files = []

for file in glob.glob(os.path.join(sys.argv[1], "*.wmf")):
    page = re.search("(\d+).wmf$", file).group(1)
    files.append((int(page), file))

# files.sort()

for page, file in files:

    outfile = "%s-%d.png" % (presentation, page)

    if not force and os.path.isfile(outfile):
        continue

    try:

        image = Image.open(file)

        # poor mans antialiasing: render slightly larger than requested
        # size, and downsize using linear interpolation
        image.size = int(width * 1.2), int(height * 1.2)
        image.load() # force load to work around bug in 1.1.5a1
        image = image.resize((width, height), Image.BILINEAR)

        image.save(outfile)
        print outfile, "ok"

    except:

        print outfile, "failed"
        print "-" * 68
        traceback.print_exc()
        print "-" * 68

# generate

files.sort()

out = open(presentation + ".txt", "w")

for page, file in files:

    outfile = "%s-%d.png" % (presentation, page)

    # FIXME: s5maker should copy the image files, or fix the links,
    # so we don't have to resort to this kind of silliness
    imfile = os.path.abspath(outfile)
    imfile = imfile.replace(os.sep, "/")
    imfile = "file:///" + imfile

    print >>out, "#", outfile
    print >>out
    print >>out, "![%s](%s)" % (outfile, imfile)
    print >>out

print out.name, "ok"