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[libpng15] Updated contrib/sRGBtables code

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This commit is contained in:
John Bowler
2011-11-16 13:44:42 -06:00
committed by Glenn Randers-Pehrson
parent ae41dc55a2
commit 76b0459fdd
3 changed files with 187 additions and 33 deletions
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32
contrib/sRGBtables/makesRGB.c
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@@ -23,37 +23,9 @@
/* pngpriv.h includes the definition of 'PNG_sRGB_FROM_LINEAR' which is required
* to verify the actual code.
*/
#include "../pngpriv.h"
#include "../../pngpriv.h"
/*
* Utility sRGB calculation functions.
*
* Both routines take and return a floating point value in the range
* 0 to 1.0, doing a calculation according to the sRGB specification.
* (In fact the source of the numbers is the wikipedia article at
* http://en.wikipedia.org/wiki/SRGB .)
*/
double
sRGB_from_linear(double l)
{
if (l <= 0.0031308)
l *= 12.92;
else
l = 1.055 * pow(l, 1/2.4) - 0.055;
return l;
}
double
linear_from_sRGB(double s)
{
if (s <= 0.04045)
return s / 12.92;
else
return pow((s+0.055)/1.055, 2.4);
}
#include "sRGB.h"
/* The tables are declared 'const' in pngpriv.h, so this redefines the tables to
* be used.