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#!/usr/bin/env python
#Copyright (c) 2009 Simon Meers
#Permission is hereby granted, free of charge, to any person
#obtaining a copy of this software and associated documentation
#files (the "Software"), to deal in the Software without
#restriction, including without limitation the rights to use,
#copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the
#Software is furnished to do so, subject to the following
#conditions:
#The above copyright notice and this permission notice shall be
#included in all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
#OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
#NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
#HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
#WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
#FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
#OTHER DEALINGS IN THE SOFTWARE.
pattern = "*.png"
scm = """
(define (save_indexed_png in_file out_file)
(let*
(
(image (car (gimp-file-load RUN-NONINTERACTIVE in_file in_file)))
(drawable (car (gimp-image-get-active-layer image)))
)
(print in_file)
(if (= (car (gimp-drawable-is-indexed drawable)) FALSE)
(begin
(print "converting")
(gimp-image-convert-indexed image 0 0 255 0 1 "none")
(file-png-save RUN-NONINTERACTIVE image drawable out_file out_file 0 9 1 0 0 1 1)
)
(print "already indexed")
)
(gimp-image-delete image)
)
)
(define (save_indexed_png_glob pattern)
(let*
(
(filelist (cadr (file-glob pattern 1)))
)
(while (not (null? filelist))
(save_indexed_png (car filelist) (car filelist))
(set! filelist (cdr filelist))
)
)
)
(save_indexed_png_glob "%s")
(gimp-quit 0)
""" % (pattern, )
import sys
def y_or_n():
while True:
response = sys.stdin.readline().strip()
if response == 'y': return True
elif response == 'n': return False
else: print "Please enter 'y' or 'n'"
sys.stdout.write("""WARNING:
This script will permanently convert (and reduce the quality of)
all files matching the pattern "%s" in this directory.
Please ensure you have backed up the originals.
PNGs already indexed will not be affected.
Are you sure you wish to proceed? (y/n) """ % (pattern, ))
if y_or_n():
from subprocess import *
from tempfile import TemporaryFile
t = TemporaryFile()
t.writelines(scm)
t.seek(0)
p = Popen("gimp -ib -", shell=True, stdin=t)
p.communicate() #wait for completion
else:
print "Conversion aborted."
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