653 |
|
int y; |
654 |
|
COLR *scan; |
655 |
|
{ |
656 |
– |
static char *dp = NULL; |
656 |
|
static short cerr[ICONSIZ]; |
657 |
+ |
static int ynext; |
658 |
+ |
static char *dp; |
659 |
|
register int err; |
660 |
< |
register int x, xi; |
660 |
> |
register int x, ti; |
661 |
|
|
662 |
|
if (iconheight == 0) { /* initialize */ |
663 |
|
if (xmax <= ICONSIZ && ymax <= ICONSIZ) { |
670 |
|
iconwidth = ICONSIZ*xmax/ymax; |
671 |
|
iconheight = ICONSIZ; |
672 |
|
} |
673 |
+ |
ynext = 0; |
674 |
|
dp = icondata - 1; |
675 |
|
} |
676 |
< |
if (dp == NULL) /* done already */ |
676 |
> |
if (y < ynext*ymax/iconheight) /* skip this one */ |
677 |
|
return; |
676 |
– |
if (y % (ymax/iconheight)) /* skip this one */ |
677 |
– |
return; |
678 |
|
err = 0; |
679 |
|
for (x = 0; x < iconwidth; x++) { |
680 |
|
if (!(x&7)) |
681 |
|
*++dp = 0; |
682 |
< |
xi = x*xmax/iconwidth; |
683 |
< |
err += normbright(scan[xi]) + cerr[x]; |
682 |
> |
ti = x*xmax/iconwidth; |
683 |
> |
err += normbright(scan[ti]) + cerr[x]; |
684 |
|
if (err > 127) |
685 |
|
err -= 255; |
686 |
|
else |
687 |
|
*dp |= 1<<(x&07); |
688 |
|
cerr[x] = err >>= 1; |
689 |
|
} |
690 |
< |
if (y >= ymax - ymax/iconheight) /* all done */ |
691 |
< |
dp = NULL; |
690 |
> |
ynext++; |
691 |
|
} |
692 |
|
|
693 |
|
|