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.config/retroarch/assets/xmb/NPMApng2PMApng.py

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+#    Copyright (C) 2011, Maxime Biais <http://twitter.com/maximeb>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# $Id$
+
+from PIL import Image
+import numpy
+
+def is_pma(matrix):
+    for line in matrix:
+        for e in line:
+            if e[3] != 255:
+                if e[0] > e[3] or e[1] > e[3] or e[2] > e[3]:
+                    return False
+    return True
+
+def main(finput, foutput):
+    # load
+    #print "load image"
+    im = Image.open(finput)
+    matrix = numpy.array(im)
+    # premultiply alpha
+    print "checking PMA"
+    if is_pma(matrix):
+	    print "Skipped %s: already Premultiplied Alpha image" % (finput, )
+	    return
+    print "premultiplying matrix..."
+    for line in matrix:
+        for v in line:
+            v[0] = v[0] * (v[3] / 255.)
+            v[1] = v[1] * (v[3] / 255.)
+            v[2] = v[2] * (v[3] / 255.)
+    # save
+    #print "matrix to image"
+    res = Image.fromarray(matrix)
+    #print "export to png"
+    res.save(foutput)
+
+if __name__ == "__main__":
+    import sys
+    main(sys.argv[1], sys.argv[2])
+