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[libpng16] Fixed previous support for Z_PREFIX in configure builds, corrected

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sCAL APIs; some of these use floating point arithmetic so they need to be
disabled if floating point arithmetic is switched off.  This is a quiet API
change - previously it appeared that the APIs were supported if fixed point
arithmetic was used internally, however they required certain APIs (floor,
modf, frexp, atof) that are part of C floating point support. Changed
png_fixed and the gamma code specific version of the same to avoid floor(),
which may be a library function (not an intrinsic). Removed unused #if 0
code.
This commit is contained in:
John Bowler
2012-12-17 21:07:30 -06:00
committed by Glenn Randers-Pehrson
parent 9b99600c4d
commit fbbbc620b8
10 changed files with 81 additions and 382 deletions
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12
pngrtran.c
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@@ -257,16 +257,10 @@ convert_gamma_value(png_structrp png_ptr, double output_gamma)
* bug reports. Negative values fail inside the _fixed API unless they
* correspond to the flag values.
*/
if (output_gamma > 0 && output_gamma < 128)
output_gamma *= PNG_FP_1;
if (output_gamma < 0 || output_gamma > 128)
output_gamma *= .00001;
/* This preserves -1 and -2 exactly: */
output_gamma = floor(output_gamma + .5);
if (output_gamma > PNG_FP_MAX || output_gamma < PNG_FP_MIN)
png_fixed_error(png_ptr, "gamma value");
return (png_fixed_point)output_gamma;
return png_fixed(png_ptr, output_gamma, "gamma value");
}
# endif
#endif /* READ_ALPHA_MODE || READ_GAMMA */