diff options
author | José Fonseca <jfonseca@vmware.com> | 2010-04-04 20:12:02 +0100 |
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committer | José Fonseca <jfonseca@vmware.com> | 2010-04-06 15:38:21 +0100 |
commit | 10dd0cad67ebd0476c9e4de522af3eea136b0e93 (patch) | |
tree | 75911690d9cbf1cb72a3ba3e35ebb62510807e9a /src/gallium/auxiliary/util/u_format_srgb.py | |
parent | d18d0fdcd8daa0d9979b72978795f0305d2db7c8 (diff) |
util: Support all SRGB formats.
Based on code from Brian Paul and Michal Krol.
Diffstat (limited to 'src/gallium/auxiliary/util/u_format_srgb.py')
-rw-r--r-- | src/gallium/auxiliary/util/u_format_srgb.py | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_format_srgb.py b/src/gallium/auxiliary/util/u_format_srgb.py new file mode 100644 index 0000000000..a4c76dc00b --- /dev/null +++ b/src/gallium/auxiliary/util/u_format_srgb.py @@ -0,0 +1,101 @@ +#!/usr/bin/env python + +''' +/************************************************************************** + * + * Copyright 2010 VMware, Inc. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS 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 NON-INFRINGEMENT. + * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/** + * @file + * SRGB translation. + * + * @author Brian Paul <brianp@vmware.com> + * @author Michal Krol <michal@vmware.com> + * @author Jose Fonseca <jfonseca@vmware.com> + */ +''' + + +import sys +import math + + +def srgb_to_linear(x): + if x <= 0.04045: + return x / 12.92 + else: + return math.pow((x + 0.055) / 1.055, 2.4) + + +def linear_to_srgb(x): + if x >= 0.0031308: + return 1.055 * math.pow(x, 0.41666) - 0.055 + else: + return 12.92 * x + +def generate_srgb_tables(): + print 'const float' + print 'util_format_srgb_8unorm_to_linear_float_table[256] = {' + for j in range(0, 256, 4): + print ' ', + for i in range(j, j + 4): + print '%.7e,' % (srgb_to_linear(i / 255.0),), + print + print '};' + print + print 'const uint8_t' + print 'util_format_srgb_to_linear_8unorm_table[256] = {' + for j in range(0, 256, 16): + print ' ', + for i in range(j, j + 16): + print '%3u,' % (int(srgb_to_linear(i / 255.0) * 255.0 + 0.5),), + print + print '};' + print + print 'const uint8_t' + print 'util_format_linear_to_srgb_8unorm_table[256] = {' + for j in range(0, 256, 16): + print ' ', + for i in range(j, j + 16): + print '%3u,' % (int(linear_to_srgb(i / 255.0) * 255.0 + 0.5),), + print + print '};' + print + + +def main(): + print '/* This file is autogenerated by u_format_srgb.py. Do not edit directly. */' + print + # This will print the copyright message on the top of this file + print __doc__.strip() + print + print '#include "u_format_srgb.h"' + print + generate_srgb_tables() + + +if __name__ == '__main__': + main() |