scaletab.c File Reference

#include "pixels.h"

Go to the source code of this file.

Functions
void	mk_scaletable (void)

Variables
int	ok_scaletable = 0
uint8_t	scaletable [256][256]

Function Documentation

mk_scaletable()

void mk_scaletable

(

void

)

Definition at line 26 of file scaletab.c.

{
  unsigned p, q, r ;
  if( ok_scaletable ) return ;
  for( p = 0 ; p < 128 ; p++ )
    for( q = 0 ; q <= p ; q++  ) {
      r = (p*q+127)/255 ;
      scaletable[p][q] = scaletable[q][p] = r ;
      scaletable[255-p][q] = scaletable[q][255-p] = q-r ;
      scaletable[p][255-q] = scaletable[255-q][p] = p-r ;
      scaletable[255-p][255-q] = scaletable[255-q][255-p] = (255-q)-(p-r) ;
    }
  ok_scaletable = 1 ;
}

References ok_scaletable, p, and scaletable.

Variable Documentation

ok_scaletable

int ok_scaletable = 0

Definition at line 23 of file scaletab.c.

scaletable

uint8_t scaletable[256][256]

Definition at line 22 of file scaletab.c.