1 files changed, 46 insertions, 0 deletions
diff --git a/PIL/ImageMode.py b/PIL/ImageMode.py
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+++ b/PIL/ImageMode.py
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+#
+# The Python Imaging Library.
+# $Id: /work/modules/pil/PIL/ImageFilter.py 486 2004-10-06T08:55:20.930352Z fredrik  $
+#
+# 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 = {}
+
+##
+# Wrapper for mode strings.
+
+class ModeDescriptor:
+
+    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
+
+##
+# Gets a mode descriptor for the given mode.
+
+def getmode(mode):
+    if not _modes:
+        # initialize mode cache
+        import Image
+        # core modes
+        for m, (basemode, basetype, bands) in Image._MODEINFO.items():
+            _modes[m] = ModeDescriptor(m, bands, basemode, basetype)
+        # extra experimental modes
+        _modes["LA"] = ModeDescriptor("LA", ("L", "A"), "L", "L")
+        _modes["PA"] = ModeDescriptor("PA", ("P", "A"), "RGB", "L")
+    return _modes[mode]