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authorTao Bao <tbao@google.com>2015-12-12 00:18:51 +0100
committerTao Bao <tbao@google.com>2015-12-16 20:35:52 +0100
commitb723f4f38f53a38502abb1a63165ac0749bc9cd9 (patch)
treec311d658de7ac03080583b24e9157cc6f502f1b4 /interlace-frames.py
parentMerge "updater: Use O_SYNC and fsync() for package_extract_file()." (diff)
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Diffstat (limited to 'interlace-frames.py')
-rw-r--r--interlace-frames.py79
1 files changed, 53 insertions, 26 deletions
diff --git a/interlace-frames.py b/interlace-frames.py
index 243e565e7..3e777b470 100644
--- a/interlace-frames.py
+++ b/interlace-frames.py
@@ -12,42 +12,69 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-"""Script to take a set of frames (PNG files) for a recovery animation
-and turn it into a single output image which contains the input frames
-interlaced by row. Run with the names of all the input frames on the
-command line, in order, followed by the name of the output file."""
+"""
+Script to take a set of frames (PNG files) for a recovery animation and turn
+it into a single output image which contains the input frames interlaced by
+row. Run with the names of all the input frames on the command line. Specify
+the name of the output file with -o (or --output), and optionally specify the
+number of frames per second (FPS) with --fps (default: 20).
+e.g.
+interlace-frames.py --fps 20 --output output.png frame0.png frame1.png frame3.png
+"""
+
+from __future__ import print_function
+
+import argparse
import sys
try:
import Image
import PngImagePlugin
except ImportError:
- print "This script requires the Python Imaging Library to be installed."
+ print("This script requires the Python Imaging Library to be installed.")
sys.exit(1)
-frames = [Image.open(fn).convert("RGB") for fn in sys.argv[1:-1]]
-assert len(frames) > 0, "Must have at least one input frame."
-sizes = set()
-for fr in frames:
- sizes.add(fr.size)
-assert len(sizes) == 1, "All input images must have the same size."
-w, h = sizes.pop()
-N = len(frames)
+def interlace(output, fps, inputs):
+ frames = [Image.open(fn).convert("RGB") for fn in inputs]
+ assert len(frames) > 0, "Must have at least one input frame."
+ sizes = set()
+ for fr in frames:
+ sizes.add(fr.size)
+
+ assert len(sizes) == 1, "All input images must have the same size."
+ w, h = sizes.pop()
+ N = len(frames)
+
+ out = Image.new("RGB", (w, h*N))
+ for j in range(h):
+ for i in range(w):
+ for fn, f in enumerate(frames):
+ out.putpixel((i, j*N+fn), f.getpixel((i, j)))
+
+ # When loading this image, the graphics library expects to find a text
+ # chunk that specifies how many frames this animation represents. If
+ # you post-process the output of this script with some kind of
+ # optimizer tool (eg pngcrush or zopflipng) make sure that your
+ # optimizer preserves this text chunk.
+
+ meta = PngImagePlugin.PngInfo()
+ meta.add_text("Frames", str(N))
+ meta.add_text("FPS", str(fps))
+
+ out.save(output, pnginfo=meta)
+
+
+def main(argv):
+ parser = argparse.ArgumentParser()
+ parser.add_argument('--fps', default=20)
+ parser.add_argument('--output', '-o', required=True)
+ parser.add_argument('input', nargs='+')
+ args = parser.parse_args(argv)
-out = Image.new("RGB", (w, h*N))
-for j in range(h):
- for i in range(w):
- for fn, f in enumerate(frames):
- out.putpixel((i, j*N+fn), f.getpixel((i, j)))
+ interlace(args.output, args.fps, args.input)
-# When loading this image, the graphics library expects to find a text
-# chunk that specifies how many frames this animation represents. If
-# you post-process the output of this script with some kind of
-# optimizer tool (eg pngcrush or zopflipng) make sure that your
-# optimizer preserves this text chunk.
-meta = PngImagePlugin.PngInfo()
-meta.add_text("Frames", str(N))
+if __name__ == '__main__':
+ main(sys.argv[1:])
-out.save(sys.argv[-1], pnginfo=meta)