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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]