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- #
- # The Python Imaging Library.
- # $Id$
- #
- # standard mode descriptors
- #
- # History:
- # 2006-03-20 fl Added
- #
- # Copyright (c) 2006 by Secret Labs AB.
- # Copyright (c) 2006 by Fredrik Lundh.
- #
- # See the README file for information on usage and redistribution.
- #
-
- # mode descriptor cache
- _modes = None
-
-
- class ModeDescriptor(object):
- """Wrapper for mode strings."""
-
- def __init__(self, mode, bands, basemode, basetype):
- self.mode = mode
- self.bands = bands
- self.basemode = basemode
- self.basetype = basetype
-
- def __str__(self):
- return self.mode
-
-
- def getmode(mode):
- """Gets a mode descriptor for the given mode."""
- global _modes
- if not _modes:
- # initialize mode cache
-
- from . import Image
- modes = {}
- # core modes
- for m, (basemode, basetype, bands) in Image._MODEINFO.items():
- modes[m] = ModeDescriptor(m, bands, basemode, basetype)
- # extra experimental modes
- modes["RGBa"] = ModeDescriptor("RGBa",
- ("R", "G", "B", "a"), "RGB", "L")
- modes["LA"] = ModeDescriptor("LA", ("L", "A"), "L", "L")
- modes["La"] = ModeDescriptor("La", ("L", "a"), "L", "L")
- modes["PA"] = ModeDescriptor("PA", ("P", "A"), "RGB", "L")
- # mapping modes
- modes["I;16"] = ModeDescriptor("I;16", "I", "L", "L")
- modes["I;16L"] = ModeDescriptor("I;16L", "I", "L", "L")
- modes["I;16B"] = ModeDescriptor("I;16B", "I", "L", "L")
- # set global mode cache atomically
- _modes = modes
- return _modes[mode]
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