updates

Backend/venv/bin/pricolpng

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+#!/home/gnx/Desktop/Hotel-Booking/Backend/venv/bin/python3
+
+# http://www.python.org/doc/2.4.4/lib/module-itertools.html
+import itertools
+import sys
+
+import png
+
+Description = """Join PNG images in a column top-to-bottom."""
+
+
+class FormatError(Exception):
+    """
+    Some problem with the image format.
+    """
+
+
+def join_col(out, l):
+    """
+    Join the list of images.
+    All input images must be same width and
+    have the same number of channels.
+    They are joined top-to-bottom.
+    `out` is the (open file) destination for the output image.
+    `l` should be a list of open files (the input image files).
+    """
+
+    image = 0
+    stream = 0
+
+    # When the first image is read, this will be the reference width,
+    # which must be the same for all images.
+    width = None
+    # Total height (accumulated as images are read).
+    height = 0
+    # Accumulated rows.
+    rows = []
+
+    for f in l:
+        stream += 1
+        while True:
+            im = png.Reader(file=f)
+            try:
+                im.preamble()
+            except EOFError:
+                break
+            image += 1
+
+            if not width:
+                width = im.width
+            elif width != im.width:
+                raise FormatError('Image %d in stream %d has width %d; does not match %d.' %
+                  (image, stream, im.width, width))
+
+            height += im.height
+            # Various bugs here because different numbers of channels and depths go wrong.
+            w, h, p, info = im.asDirect()
+            rows.extend(p)
+
+    # Alarmingly re-use the last info object.
+    tinfo = dict(info)
+    del tinfo['size']
+    w = png.Writer(width, height, **tinfo)
+
+    w.write(out, rows)
+
+
+def main(argv):
+    import argparse
+
+    parser = argparse.ArgumentParser(description=Description)
+    parser.add_argument(
+        "input", nargs="*", default="-", type=png.cli_open, metavar="PNG"
+    )
+
+    args = parser.parse_args()
+
+    return join_col(png.binary_stdout(), args.input)
+
+if __name__ == '__main__':
+    main(sys.argv)