75 lines
2.0 KiB
Python
75 lines
2.0 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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modes = {}
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for m, (basemode, basetype, bands) in {
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# core modes
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"1": ("L", "L", ("1",)),
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"L": ("L", "L", ("L",)),
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"I": ("L", "I", ("I",)),
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"F": ("L", "F", ("F",)),
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"P": ("P", "L", ("P",)),
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"RGB": ("RGB", "L", ("R", "G", "B")),
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"RGBX": ("RGB", "L", ("R", "G", "B", "X")),
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"RGBA": ("RGB", "L", ("R", "G", "B", "A")),
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"CMYK": ("RGB", "L", ("C", "M", "Y", "K")),
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"YCbCr": ("RGB", "L", ("Y", "Cb", "Cr")),
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"LAB": ("RGB", "L", ("L", "A", "B")),
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"HSV": ("RGB", "L", ("H", "S", "V")),
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# extra experimental modes
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"RGBa": ("RGB", "L", ("R", "G", "B", "a")),
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"LA": ("L", "L", ("L", "A")),
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"La": ("L", "L", ("L", "a")),
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"PA": ("RGB", "L", ("P", "A")),
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}.items():
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modes[m] = ModeDescriptor(m, bands, basemode, basetype)
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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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