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Remove use of std::abs (fixes #172)

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Different compilers want different choices of headers for std::abs.
It's easier to just to not use it.
This commit is contained in:
Jay Berkenbilt 2018-02-04 13:51:54 -05:00
parent 34a9b835b0
commit d5bfd49cb2
1 changed files with 8 additions and 4 deletions
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12
libqpdf/Pl_PNGFilter.cc
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@ -3,7 +3,11 @@
#include <stdexcept>
#include <string.h>
#include <limits.h>
#include <algorithm>
static int abs_diff(int a, int b)
{
return a > b ? a - b : b - a;
}
Pl_PNGFilter::Pl_PNGFilter(char const* identifier, Pipeline* next,
action_e action, unsigned int columns,
@ -218,9 +222,9 @@ int
Pl_PNGFilter::PaethPredictor(int a, int b, int c)
{
int p = a + b - c;
int pa = std::abs(p - a);
int pb = std::abs(p - b);
int pc = std::abs(p - c);
int pa = abs_diff(p, a);
int pb = abs_diff(p, b);
int pc = abs_diff(p, c);
if (pa <= pb && pa <= pc)
{