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92 lines
2.9 KiB
92 lines
2.9 KiB
#
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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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import sys
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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, typestr):
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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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self.typestr = typestr
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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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endian = "<" if sys.byteorder == "little" else ">"
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for m, (basemode, basetype, bands, typestr) in {
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# core modes
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# Bits need to be extended to bytes
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"1": ("L", "L", ("1",), "|b1"),
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"L": ("L", "L", ("L",), "|u1"),
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"I": ("L", "I", ("I",), endian + "i4"),
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"F": ("L", "F", ("F",), endian + "f4"),
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"P": ("P", "L", ("P",), "|u1"),
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"RGB": ("RGB", "L", ("R", "G", "B"), "|u1"),
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"RGBX": ("RGB", "L", ("R", "G", "B", "X"), "|u1"),
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"RGBA": ("RGB", "L", ("R", "G", "B", "A"), "|u1"),
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"CMYK": ("RGB", "L", ("C", "M", "Y", "K"), "|u1"),
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"YCbCr": ("RGB", "L", ("Y", "Cb", "Cr"), "|u1"),
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# UNDONE - unsigned |u1i1i1
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"LAB": ("RGB", "L", ("L", "A", "B"), "|u1"),
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"HSV": ("RGB", "L", ("H", "S", "V"), "|u1"),
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# extra experimental modes
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"RGBa": ("RGB", "L", ("R", "G", "B", "a"), "|u1"),
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"BGR;15": ("RGB", "L", ("B", "G", "R"), endian + "u2"),
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"BGR;16": ("RGB", "L", ("B", "G", "R"), endian + "u2"),
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"BGR;24": ("RGB", "L", ("B", "G", "R"), endian + "u3"),
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"BGR;32": ("RGB", "L", ("B", "G", "R"), endian + "u4"),
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"LA": ("L", "L", ("L", "A"), "|u1"),
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"La": ("L", "L", ("L", "a"), "|u1"),
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"PA": ("RGB", "L", ("P", "A"), "|u1"),
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}.items():
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modes[m] = ModeDescriptor(m, bands, basemode, basetype, typestr)
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# mapping modes
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for i16mode, typestr in {
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# I;16 == I;16L, and I;32 == I;32L
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"I;16": "<u2",
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"I;16S": "<i2",
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"I;16L": "<u2",
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"I;16LS": "<i2",
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"I;16B": ">u2",
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"I;16BS": ">i2",
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"I;16N": endian + "u2",
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"I;16NS": endian + "i2",
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"I;32": "<u4",
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"I;32B": ">u4",
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"I;32L": "<u4",
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"I;32S": "<i4",
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"I;32BS": ">i4",
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"I;32LS": "<i4",
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}.items():
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modes[i16mode] = ModeDescriptor(i16mode, ("I",), "L", "L", typestr)
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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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