code. compile. run. debug. share.
#include <stdio.h>
#include <math.h>
int
main ()
{
for (unsigned int precision = 31; precision > 1; --precision)
{
int max_fails = 3;
printf ("New precision(%u): 1/2 = 0x%x\n", precision,
(1 << precision) / 2);
/* All new PNM code should support 16bits, 48bit colors */
for (unsigned int maxv = 1; maxv < 0xffff; ++maxv)
{
int new_adjust = (255 << precision) / maxv;
float adjust = 255.0f / maxv;
for (unsigned int value = 0; value < maxv; ++value)
{
unsigned char new_out =
(value * new_adjust + (1 << precision) / 2) >> precision;
unsigned char out = lroundf (value * adjust);
if (new_out != out)
{
if (!(--max_fails))
goto try_next;
printf ("Fail: %u!=%u @%u %u<=%u\n", new_out, out,
precision, value, maxv);
}
}
}
try_next:
;
}
return (0);
}
Compiling Program...
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