2010-04-04 20:12:02 +01:00
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#!/usr/bin/env python
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2010-10-28 17:38:18 +01:00
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CopyRight = '''
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2010-04-04 20:12:02 +01:00
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/**************************************************************************
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*
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* Copyright 2010 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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* SRGB translation.
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*
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* @author Brian Paul <brianp@vmware.com>
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* @author Michal Krol <michal@vmware.com>
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* @author Jose Fonseca <jfonseca@vmware.com>
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*/
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'''
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import math
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def srgb_to_linear(x):
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if x <= 0.04045:
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return x / 12.92
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else:
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return math.pow((x + 0.055) / 1.055, 2.4)
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def linear_to_srgb(x):
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if x >= 0.0031308:
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return 1.055 * math.pow(x, 0.41666) - 0.055
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else:
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return 12.92 * x
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def generate_srgb_tables():
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print 'const float'
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print 'util_format_srgb_8unorm_to_linear_float_table[256] = {'
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for j in range(0, 256, 4):
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print ' ',
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for i in range(j, j + 4):
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print '%.7e,' % (srgb_to_linear(i / 255.0),),
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print
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print '};'
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print
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print 'const uint8_t'
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print 'util_format_srgb_to_linear_8unorm_table[256] = {'
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for j in range(0, 256, 16):
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print ' ',
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for i in range(j, j + 16):
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print '%3u,' % (int(srgb_to_linear(i / 255.0) * 255.0 + 0.5),),
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print
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print '};'
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print
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print 'const uint8_t'
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print 'util_format_linear_to_srgb_8unorm_table[256] = {'
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for j in range(0, 256, 16):
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print ' ',
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for i in range(j, j + 16):
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print '%3u,' % (int(linear_to_srgb(i / 255.0) * 255.0 + 0.5),),
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print
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print '};'
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print
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def main():
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print '/* This file is autogenerated by u_format_srgb.py. Do not edit directly. */'
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print
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# This will print the copyright message on the top of this file
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2010-10-28 17:38:18 +01:00
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print CopyRight.strip()
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2010-04-04 20:12:02 +01:00
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print
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print '#include "u_format_srgb.h"'
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print
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generate_srgb_tables()
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if __name__ == '__main__':
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main()
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