64 lines
1.6 KiB
Python
64 lines
1.6 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# standard mode descriptors
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#
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# History:
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# 2006-03-20 fl Added
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#
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# Copyright (c) 2006 by Secret Labs AB.
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# Copyright (c) 2006 by Fredrik Lundh.
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#
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# See the README file for information on usage and redistribution.
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#
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# mode descriptor cache
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_modes = None
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class ModeDescriptor:
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"""Wrapper for mode strings."""
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def __init__(self, mode, bands, basemode, basetype):
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self.mode = mode
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self.bands = bands
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self.basemode = basemode
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self.basetype = basetype
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def __str__(self):
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return self.mode
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def getmode(mode):
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"""Gets a mode descriptor for the given mode."""
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global _modes
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if not _modes:
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# initialize mode cache
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from . import Image
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modes = {}
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# core modes
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for m, (basemode, basetype, bands) in Image._MODEINFO.items():
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modes[m] = ModeDescriptor(m, bands, basemode, basetype)
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# extra experimental modes
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modes["RGBa"] = ModeDescriptor("RGBa", ("R", "G", "B", "a"), "RGB", "L")
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modes["LA"] = ModeDescriptor("LA", ("L", "A"), "L", "L")
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modes["La"] = ModeDescriptor("La", ("L", "a"), "L", "L")
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modes["PA"] = ModeDescriptor("PA", ("P", "A"), "RGB", "L")
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# mapping modes
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for i16mode in (
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"I;16",
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"I;16S",
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"I;16L",
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"I;16LS",
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"I;16B",
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"I;16BS",
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"I;16N",
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"I;16NS",
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):
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modes[i16mode] = ModeDescriptor(i16mode, ("I",), "L", "L")
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# set global mode cache atomically
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_modes = modes
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return _modes[mode]
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