621 |
|
{ |
622 |
|
register unsigned char *dp; |
623 |
|
register int x, err; |
624 |
< |
int y; |
624 |
> |
int y, errp; |
625 |
|
short *cerr; |
626 |
|
|
627 |
|
if ((cerr = (short *)calloc(xmax,sizeof(short))) == NULL) |
636 |
|
for (x = 0; x < xmax; x++) { |
637 |
|
if (!(x&7)) |
638 |
|
*++dp = 0; |
639 |
+ |
errp = err; |
640 |
|
err += normbright(scanline[x]) + cerr[x]; |
641 |
|
if (err > 127) |
642 |
|
err -= 255; |
643 |
|
else |
644 |
|
*dp |= 1<<(7-(x&07)); |
645 |
< |
cerr[x] = err >>= 1; |
645 |
> |
err /= 3; |
646 |
> |
cerr[x] = err + errp; |
647 |
|
} |
648 |
|
} |
649 |
|
free((char *)cerr); |
659 |
|
static char *dp; |
660 |
|
register int err; |
661 |
|
register int x, ti; |
662 |
+ |
int errp; |
663 |
|
|
664 |
|
if (iconheight == 0) { /* initialize */ |
665 |
|
if (xmax <= ICONSIZ && ymax <= ICONSIZ) { |
668 |
|
} else if (xmax > ymax) { |
669 |
|
iconwidth = ICONSIZ; |
670 |
|
iconheight = ICONSIZ*ymax/xmax; |
671 |
+ |
if (iconheight < 1) |
672 |
+ |
iconheight = 1; |
673 |
|
} else { |
674 |
|
iconwidth = ICONSIZ*xmax/ymax; |
675 |
+ |
if (iconwidth < 1) |
676 |
+ |
iconwidth = 1; |
677 |
|
iconheight = ICONSIZ; |
678 |
|
} |
679 |
|
ynext = 0; |
685 |
|
for (x = 0; x < iconwidth; x++) { |
686 |
|
if (!(x&7)) |
687 |
|
*++dp = 0; |
688 |
+ |
errp = err; |
689 |
|
ti = x*xmax/iconwidth; |
690 |
|
err += normbright(scan[ti]) + cerr[x]; |
691 |
|
if (err > 127) |
692 |
|
err -= 255; |
693 |
|
else |
694 |
|
*dp |= 1<<(x&07); |
695 |
< |
cerr[x] = err >>= 1; |
695 |
> |
err /= 3; |
696 |
> |
cerr[x] = err + errp; |
697 |
|
} |
698 |
|
ynext++; |
699 |
|
} |