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1#!/usr/bin/env python
2# Copyright (C) 2014 The Android Open Source Project
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16"""
17Script to take a set of frames (PNG files) for a recovery animation
18and turn it into a single output image which contains the input frames
19interlaced by row.  Run with the names of all the input frames on the
20command line, in order, followed by the name of the output file.
21"""
22
23from __future__ import print_function
24
25import argparse
26import os.path
27import sys
28try:
29  import Image
30  import PngImagePlugin
31except ImportError:
32  print("This script requires the Python Imaging Library to be installed.")
33  sys.exit(1)
34
35
36def interlace(output, inputs):
37  frames = [Image.open(fn).convert("RGB") for fn in inputs]
38  assert len(frames) > 0, "Must have at least one input frame."
39  sizes = set()
40  for fr in frames:
41    sizes.add(fr.size)
42
43  assert len(sizes) == 1, "All input images must have the same size."
44  w, h = sizes.pop()
45  N = len(frames)
46
47  out = Image.new("RGB", (w, h*N))
48  for j in range(h):
49    for i in range(w):
50      for fn, f in enumerate(frames):
51        out.putpixel((i, j*N+fn), f.getpixel((i, j)))
52
53  # When loading this image, the graphics library expects to find a text
54  # chunk that specifies how many frames this animation represents.  If
55  # you post-process the output of this script with some kind of
56  # optimizer tool (eg pngcrush or zopflipng) make sure that your
57  # optimizer preserves this text chunk.
58
59  meta = PngImagePlugin.PngInfo()
60  meta.add_text("Frames", str(N))
61
62  out.save(output, pnginfo=meta)
63
64
65def deinterlace(output, input):
66  # Truncate the output filename extension if it's '.png'.
67  if os.path.splitext(output)[1].lower() == '.png':
68    output = output[:-4]
69
70  img2 = Image.open(input)
71  print(img2.mode)
72  palette = img2.getpalette()
73  img = img2.convert("RGB")
74  num_frames = int(img.info.get('Frames', 1))
75  print('Found %d frames in %s.' % (num_frames, input))
76  assert num_frames > 0, 'Invalid Frames meta.'
77
78  # palette = img.getpalette()
79  print(palette)
80
81  width, height = img.size
82  height /= num_frames
83  for k in range(num_frames):
84    out = Image.new('RGB', (width, height))
85    out.info = img.info
86    for i in range(width):
87      for j in range(height):
88        out.putpixel((i, j), img.getpixel((i, j * num_frames + k)))
89    # out.putpalette(img.getpalette(), rawmode='RGB')
90    out2 = out.convert(mode='P', palette=palette)
91    #out2 = out
92    print(out2.mode)
93    # out2.putpalette(palette)
94    filename = '%s%02d.png' % (output, k)
95    out2.save(filename)
96    print('Frame %d written to %s.' % (k, filename))
97
98
99def main(argv):
100  parser = argparse.ArgumentParser(description='Parse')
101  parser.add_argument('--deinterlace', '-d', action='store_true')
102  parser.add_argument('--output', '-o', required=True)
103  parser.add_argument('input', nargs='+')
104  args = parser.parse_args(argv)
105
106  if args.deinterlace:
107    # args.input is a list, and we only process the first when deinterlacing.
108    deinterlace(args.output, args.input[0])
109  else:
110    interlace(args.output, args.input)
111
112
113if __name__ == '__main__':
114  main(sys.argv[1:])
115