--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hostsupport/hostopenvg/genheader/make_gamma_lut.py	Wed Oct 06 17:59:01 2010 +0100
@@ -0,0 +1,81 @@
+#! /usr/bin/python
+# Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and /or associated documentation files
+# (the "Materials "), to deal in the Materials without restriction,
+# including without limitation the rights to use, copy, modify, merge,
+# publish, distribute, sublicense, and/or sell copies of the Materials,
+# and to permit persons to whom the Materials are furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Materials.
+#
+# THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR
+# THE USE OR OTHER DEALINGS IN THE MATERIALS.
+
+# Extremely coarse lrgb<->srgb conversion table generation
+
+from c_utils import *
+
+GAMMA_BITS = 8
+
+def linear_to_gamma(f):
+    if f <= 0.00304:
+        return 12.92 * f
+    return 1.0556*pow(f, 1/2.4) - 0.0556
+
+def gamma_to_linear(f):
+    if f <= 0.03928:
+        return f / 12.92
+    return pow((f+0.0556)/1.0556, 2.4)
+
+def clamp(i, mn, mx):
+    if i < mn:
+        return mn
+    if i > mx:
+        return mx
+    return i
+
+def icolortof(i):
+    return i / 255.0
+
+def fcolortoi(f):
+    return int(f * ((1<<GAMMA_BITS)-1) + 0.5)
+
+all_components = range(0,256)
+all_floats = map(icolortof, all_components)
+
+def make_color_list(conv_func):
+    return map(fcolortoi, map(conv_func, all_floats))
+
+def make_lut_array(name, data):
+    make_array("static const", "RIuint8", name, data, hex_formatter)  
+
+def print_lrgb_to_srgb_table():
+    make_lut_array("sc_lRGB_to_sRGB", make_color_list(linear_to_gamma))
+
+def print_srgb_to_lrgb_table():
+    make_lut_array("sc_sRGB_to_lRGB", make_color_list(gamma_to_linear))
+
+def print_lookups():
+    begin_include_guard("_SFGAMMARCP_H_") 
+    print ""
+    make_include("riDefs.h")
+    print ""
+    begin_namespace("OpenVGRI")
+    print_srgb_to_lrgb_table()
+    print ""
+    print_lrgb_to_srgb_table()
+    end_namespace()
+    end_include_guard()
+
+if __name__ == '__main__':
+    print_lookups()
+