Merged wxPython 2.4.x to the 2.5 branch (Finally!!!)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19793 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wxPython/lib/imageutils.py

@@ -0,0 +1,45 @@
+#----------------------------------------------------------------------
+# Name:        wxPython.lib.imageutils
+# Purpose:     A collection of functions for simple image manipulations
+#
+# Author:      Robb Shecter
+#
+# Created:     7-Nov-2002
+# RCS-ID:      $Id$
+# Copyright:   (c) 2002 by
+# Licence:     wxWindows license
+#----------------------------------------------------------------------
+
+from __future__ import nested_scopes
+
+
+def grayOut(anImage):
+    """
+    Convert the given image (in place) to a grayed-out
+    version, appropriate for a 'disabled' appearance.
+    """
+    factor = 0.7        # 0 < f < 1.  Higher is grayer.
+    if anImage.HasMask():
+        maskColor = (anImage.GetMaskRed(), anImage.GetMaskGreen(), anImage.GetMaskBlue())
+    else:
+        maskColor = None
+    data = map(ord, list(anImage.GetData()))
+
+    for i in range(0, len(data), 3):
+        pixel = (data[i], data[i+1], data[i+2])
+        pixel = makeGray(pixel, factor, maskColor)
+        for x in range(3):
+            data[i+x] = pixel[x]
+    anImage.SetData(''.join(map(chr, data)))
+
+
+def makeGray((r,g,b), factor, maskColor):
+    """
+    Make a pixel grayed-out. If the pixel
+    matches the maskColor, it won't be
+    changed.
+    """
+    if (r,g,b) != maskColor:
+        return map(lambda x: ((230 - x) * factor) + x, (r,g,b))
+    else:
+        return (r,g,b)