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projecten1/lib/python3.6/site-packages/PIL/ImageMode.py

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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]