From 6eab18513b46e7ba9d18965a75da8176e21091d5 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Wed, 15 Aug 2012 22:52:28 +0100
Subject: [PATCH] Missing files.

---
 .gitignore |   4 ++
 lut.py     | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 lut.py

diff --git a/.gitignore b/.gitignore
index e32ab30c..a62199ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,7 @@ build
 doc/html
 doc/latex
 src/version.cc
+src/lut.cc
+src/lut.h
+*.pyc
+
diff --git a/lut.py b/lut.py
new file mode 100644
index 00000000..954f094f
--- /dev/null
+++ b/lut.py
@@ -0,0 +1,126 @@
+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()
-- 
2.30.2