--- /dev/null
+import math
+
+BIT_DEPTH = 12
+DCI_GAMMA = 2.6
+SRGB_GAMMA = 2.4;
+BIT_LENGTH = int(math.pow(2, BIT_DEPTH))
+COLOR_DEPTH = BIT_LENGTH - 1
+
+def boilerplate(f):
+ print >>f, """/*
+ Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+
+/* This file is auto-generated by the build scripts; edits will be lost
+ on ./waf configure.
+*/
+"""
+
+def make_luts():
+ cc = open('src/lut.cc', 'w')
+
+ boilerplate(cc)
+
+ print >>cc,"#include \"lut.h\""
+
+ print >>cc, """
+/* sRGB color matrix for XYZ -> RGB */
+float color_matrix[3][3] = {
+ { 3.240454836, -1.537138850, -0.498531547},
+ {-0.969266390, 1.876010929, 0.041556082},
+ { 0.055643420, -0.204025854, 1.057225162}
+};\n\n
+"""
+
+ print >>cc, """
+float lut_in[COLOR_DEPTH + 1] = {\n
+\t/* Bit depth: %d
+\t * Reference white: DCI
+\t * Gamma: %f
+\t */
+""" % (BIT_DEPTH, DCI_GAMMA)
+
+ c = 0
+ for i in range(0, BIT_LENGTH):
+ v = math.pow (i / (BIT_LENGTH - 1.0), DCI_GAMMA);
+
+ if (c == 0):
+ print >> cc," ",
+
+ if i < BIT_LENGTH - 1:
+ print >> cc,"%06f, " % v,
+ if c == 12:
+ c = 0;
+ print >> cc,""
+ else:
+ c += 1
+ else:
+ print >> cc,"%06f" % v
+
+ print >>cc,"};"
+
+ print >>cc, """
+int lut_out[COLOR_DEPTH + 1] = {
+\t/* Bit depth: %d
+\t * Reference white: sRGB
+\t * Gamma: %f
+\t */
+"""
+
+ c = 0
+ for i in range (0, BIT_LENGTH):
+ v = i / (BIT_LENGTH - 1.0)
+
+ if (v < (0.04045 / 12.92)):
+ v *= 12.92
+ else:
+ v = (1.055 * pow (v, (1 / SRGB_GAMMA))) - 0.055;
+
+ v *= 255
+
+ if c == 0:
+ print >> cc," ",
+
+ if i < BIT_LENGTH - 1:
+ print >> cc, "%d, " % v,
+ if c == 12:
+ c = 0;
+ print >> cc,""
+ else:
+ c += 1
+ else:
+ print >> cc,"%d" % v
+
+ print >>cc,"};"
+
+ h = open('src/lut.h', 'w')
+
+ boilerplate(h)
+
+ print >> h,"""
+#define COLOR_DEPTH (%d)
+#define DCI_COEFFICIENT (48.0/52.37)
+
+extern float color_matrix[3][3];
+extern int lut_out[COLOR_DEPTH + 1];
+extern float lut_in[COLOR_DEPTH + 1];
+""" % COLOR_DEPTH
+
+if __name__ == "__main__":
+ make_luts()