diff options
Diffstat (limited to 'mesalib/src/gallium/auxiliary/util/u_format_srgb.py')
| -rw-r--r-- | mesalib/src/gallium/auxiliary/util/u_format_srgb.py | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_format_srgb.py b/mesalib/src/gallium/auxiliary/util/u_format_srgb.py deleted file mode 100644 index c6c02f053..000000000 --- a/mesalib/src/gallium/auxiliary/util/u_format_srgb.py +++ /dev/null @@ -1,155 +0,0 @@ -#!/usr/bin/env python - -CopyRight = ''' -/************************************************************************** - * - * 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 math -import struct - - -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, 0.41666666) - 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 - -# calculate the table interpolation values used in float linear to unorm8 srgb - numexp = 13 - mantissa_msb = 3 -# stepshift is just used to only use every x-th float to make things faster, -# 5 is largest value which still gives exact same table as 0 - stepshift = 5 - nbuckets = numexp << mantissa_msb - bucketsize = (1 << (23 - mantissa_msb)) >> stepshift - mantshift = 12 - valtable = [] - sum_aa = float(bucketsize) - sum_ab = 0.0 - sum_bb = 0.0 - for i in range(0, bucketsize): - j = (i << stepshift) >> mantshift - sum_ab += j - sum_bb += j*j - inv_det = 1.0 / (sum_aa * sum_bb - sum_ab * sum_ab) - - for bucket in range(0, nbuckets): - start = ((127 - numexp) << 23) + bucket*(bucketsize << stepshift) - sum_a = 0.0 - sum_b = 0.0 - - for i in range(0, bucketsize): - j = (i << stepshift) >> mantshift - fint = start + (i << stepshift) - ffloat = struct.unpack('f', struct.pack('I', fint))[0] - val = linear_to_srgb(ffloat) * 255.0 + 0.5 - sum_a += val - sum_b += j*val - - solved_a = inv_det * (sum_bb*sum_a - sum_ab*sum_b) - solved_b = inv_det * (sum_aa*sum_b - sum_ab*sum_a) - - scaled_a = solved_a * 65536.0 / 512.0 - scaled_b = solved_b * 65536.0 - - int_a = int(scaled_a + 0.5) - int_b = int(scaled_b + 0.5) - - valtable.append((int_a << 16) + int_b) - - print 'const unsigned' - print 'util_format_linear_to_srgb_helper_table[104] = {' - - for j in range(0, nbuckets, 4): - print ' ', - for i in range(j, j + 4): - print '0x%08x,' % (valtable[i],), - 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 CopyRight.strip() - print - print '#include "u_format_srgb.h"' - print - generate_srgb_tables() - - -if __name__ == '__main__': - main() |