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/*
* Compface - 48x48x1 image compression and decompression
*
* Copyright (c) James Ashton - Sydney University - June 1990.
*
* Written 11th November 1989.
*
* Permission is given to distribute these sources, as long as the
* copyright messages are not removed, and no monies are exchanged.
*
* No responsibility is taken for any errors on inaccuracies inherent
* either to the comments or the code of this program, but if reported
* to me, then an attempt will be made to fix them.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "compface.h"
int
Same(f, wid, hei)
register char *f;
register int wid, hei;
{
register char val, *row;
register int x;
val = *f;
while (hei--)
{
row = f;
x = wid;
while (x--)
if (*(row++) != val)
return(0);
f += WIDTH;
}
return 1;
}
int
AllBlack(f, wid, hei)
char *f;
int wid, hei;
{
if (wid > 3)
{
wid /= 2;
hei /= 2;
return (AllBlack(f, wid, hei) && AllBlack(f + wid, wid, hei) &&
AllBlack(f + WIDTH * hei, wid, hei) &&
AllBlack(f + WIDTH * hei + wid, wid, hei));
}
else
return (*f || *(f + 1) || *(f + WIDTH) || *(f + WIDTH + 1));
}
int
AllWhite(f, wid, hei)
char *f;
int wid, hei;
{
return ((*f == 0) && Same(f, wid, hei));
}
void
PopGreys(f, wid, hei)
char *f;
int wid, hei;
{
if (wid > 3)
{
wid /= 2;
hei /= 2;
PopGreys(f, wid, hei);
PopGreys(f + wid, wid, hei);
PopGreys(f + WIDTH * hei, wid, hei);
PopGreys(f + WIDTH * hei + wid, wid, hei);
}
else
{
wid = BigPop(freqs);
if (wid & 1)
*f = 1;
if (wid & 2)
*(f + 1) = 1;
if (wid & 4)
*(f + WIDTH) = 1;
if (wid & 8)
*(f + WIDTH + 1) = 1;
}
}
void
PushGreys(f, wid, hei)
char *f;
int wid, hei;
{
if (wid > 3)
{
wid /= 2;
hei /= 2;
PushGreys(f, wid, hei);
PushGreys(f + wid, wid, hei);
PushGreys(f + WIDTH * hei, wid, hei);
PushGreys(f + WIDTH * hei + wid, wid, hei);
}
else
RevPush(freqs + *f + 2 * *(f + 1) + 4 * *(f + WIDTH) +
8 * *(f + WIDTH + 1));
}
void
UnCompress(f, wid, hei, lev)
register char *f;
register int wid, hei, lev;
{
switch (BigPop(&levels[lev][0]))
{
case WHITE :
return;
case BLACK :
PopGreys(f, wid, hei);
return;
default :
wid /= 2;
hei /= 2;
lev++;
UnCompress(f, wid, hei, lev);
UnCompress(f + wid, wid, hei, lev);
UnCompress(f + hei * WIDTH, wid, hei, lev);
UnCompress(f + wid + hei * WIDTH, wid, hei, lev);
return;
}
}
void
Compress(f, wid, hei, lev)
register char *f;
register int wid, hei, lev;
{
if (AllWhite(f, wid, hei))
{
RevPush(&levels[lev][WHITE]);
return;
}
if (AllBlack(f, wid, hei))
{
RevPush(&levels[lev][BLACK]);
PushGreys(f, wid, hei);
return;
}
RevPush(&levels[lev][GREY]);
wid /= 2;
hei /= 2;
lev++;
Compress(f, wid, hei, lev);
Compress(f + wid, wid, hei, lev);
Compress(f + hei * WIDTH, wid, hei, lev);
Compress(f + wid + hei * WIDTH, wid, hei, lev);
}
void
UnCompAll(fbuf)
char *fbuf;
{
register char *p;
BigClear();
BigRead(fbuf);
p = F;
while (p < F + PIXELS)
*(p++) = 0;
UnCompress(F, 16, 16, 0);
UnCompress(F + 16, 16, 16, 0);
UnCompress(F + 32, 16, 16, 0);
UnCompress(F + WIDTH * 16, 16, 16, 0);
UnCompress(F + WIDTH * 16 + 16, 16, 16, 0);
UnCompress(F + WIDTH * 16 + 32, 16, 16, 0);
UnCompress(F + WIDTH * 32, 16, 16, 0);
UnCompress(F + WIDTH * 32 + 16, 16, 16, 0);
UnCompress(F + WIDTH * 32 + 32, 16, 16, 0);
}
void
CompAll(fbuf)
char *fbuf;
{
Compress(F, 16, 16, 0);
Compress(F + 16, 16, 16, 0);
Compress(F + 32, 16, 16, 0);
Compress(F + WIDTH * 16, 16, 16, 0);
Compress(F + WIDTH * 16 + 16, 16, 16, 0);
Compress(F + WIDTH * 16 + 32, 16, 16, 0);
Compress(F + WIDTH * 32, 16, 16, 0);
Compress(F + WIDTH * 32 + 16, 16, 16, 0);
Compress(F + WIDTH * 32 + 32, 16, 16, 0);
BigClear();
while (NumProbs > 0)
BigPush(ProbBuf[--NumProbs]);
BigWrite(fbuf);
}
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