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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. | |
| # | |
| import sys | |
| # mode descriptor cache | |
| _modes = None | |
| class ModeDescriptor: | |
| """Wrapper for mode strings.""" | |
| def __init__(self, mode, bands, basemode, basetype, typestr): | |
| self.mode = mode | |
| self.bands = bands | |
| self.basemode = basemode | |
| self.basetype = basetype | |
| self.typestr = typestr | |
| 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 | |
| modes = {} | |
| endian = "<" if sys.byteorder == "little" else ">" | |
| for m, (basemode, basetype, bands, typestr) in { | |
| # core modes | |
| # Bits need to be extended to bytes | |
| "1": ("L", "L", ("1",), "|b1"), | |
| "L": ("L", "L", ("L",), "|u1"), | |
| "I": ("L", "I", ("I",), endian + "i4"), | |
| "F": ("L", "F", ("F",), endian + "f4"), | |
| "P": ("P", "L", ("P",), "|u1"), | |
| "RGB": ("RGB", "L", ("R", "G", "B"), "|u1"), | |
| "RGBX": ("RGB", "L", ("R", "G", "B", "X"), "|u1"), | |
| "RGBA": ("RGB", "L", ("R", "G", "B", "A"), "|u1"), | |
| "CMYK": ("RGB", "L", ("C", "M", "Y", "K"), "|u1"), | |
| "YCbCr": ("RGB", "L", ("Y", "Cb", "Cr"), "|u1"), | |
| # UNDONE - unsigned |u1i1i1 | |
| "LAB": ("RGB", "L", ("L", "A", "B"), "|u1"), | |
| "HSV": ("RGB", "L", ("H", "S", "V"), "|u1"), | |
| # extra experimental modes | |
| "RGBa": ("RGB", "L", ("R", "G", "B", "a"), "|u1"), | |
| "BGR;15": ("RGB", "L", ("B", "G", "R"), "|u1"), | |
| "BGR;16": ("RGB", "L", ("B", "G", "R"), "|u1"), | |
| "BGR;24": ("RGB", "L", ("B", "G", "R"), "|u1"), | |
| "LA": ("L", "L", ("L", "A"), "|u1"), | |
| "La": ("L", "L", ("L", "a"), "|u1"), | |
| "PA": ("RGB", "L", ("P", "A"), "|u1"), | |
| }.items(): | |
| modes[m] = ModeDescriptor(m, bands, basemode, basetype, typestr) | |
| # mapping modes | |
| for i16mode, typestr in { | |
| # I;16 == I;16L, and I;32 == I;32L | |
| "I;16": "<u2", | |
| "I;16S": "<i2", | |
| "I;16L": "<u2", | |
| "I;16LS": "<i2", | |
| "I;16B": ">u2", | |
| "I;16BS": ">i2", | |
| "I;16N": endian + "u2", | |
| "I;16NS": endian + "i2", | |
| "I;32": "<u4", | |
| "I;32B": ">u4", | |
| "I;32L": "<u4", | |
| "I;32S": "<i4", | |
| "I;32BS": ">i4", | |
| "I;32LS": "<i4", | |
| }.items(): | |
| modes[i16mode] = ModeDescriptor(i16mode, ("I",), "L", "L", typestr) | |
| # set global mode cache atomically | |
| _modes = modes | |
| return _modes[mode] | |