| 37 |
|
{ |
| 38 |
|
FILE *input; |
| 39 |
|
int xres, yres; |
| 40 |
< |
COLOR scanline[NCOLS]; |
| 40 |
> |
COLR scanline[NCOLS]; |
| 41 |
|
int i; |
| 42 |
|
|
| 43 |
|
if (fname == NULL) { |
| 65 |
|
((NCOLS-xres)>>4)<<5, xres); |
| 66 |
|
|
| 67 |
|
for (i = yres-1; i >= 0; i--) { |
| 68 |
< |
if (freadscan(scanline, xres, input) < 0) |
| 68 |
> |
if (freadcolrs(scanline, xres, input) < 0) |
| 69 |
|
return(-1); |
| 70 |
+ |
normscan(scanline, xres); |
| 71 |
|
plotscan(scanline, xres, i); |
| 72 |
|
} |
| 73 |
|
|
| 79 |
|
} |
| 80 |
|
|
| 81 |
|
|
| 82 |
+ |
normscan(scan, len) /* normalize a scanline */ |
| 83 |
+ |
register COLR scan[]; |
| 84 |
+ |
int len; |
| 85 |
+ |
{ |
| 86 |
+ |
register int i; |
| 87 |
+ |
|
| 88 |
+ |
for (i = 0; i < len; i++) |
| 89 |
+ |
colr_norm(scan[i], scan[i]); |
| 90 |
+ |
} |
| 91 |
+ |
|
| 92 |
+ |
|
| 93 |
|
plotscan(scan, len, y) /* plot a scanline */ |
| 94 |
< |
COLOR scan[]; |
| 94 |
> |
COLR scan[]; |
| 95 |
|
int len; |
| 96 |
|
int y; |
| 97 |
|
{ |
| 115 |
|
|
| 116 |
|
|
| 117 |
|
colbit(col, x, a) /* determine bit value for primary at x */ |
| 118 |
< |
COLOR col; |
| 118 |
> |
COLR col; |
| 119 |
|
register int x; |
| 120 |
|
register int a; |
| 121 |
|
{ |
| 122 |
< |
static float cerr[NCOLS][3]; |
| 123 |
< |
static double err[3]; |
| 124 |
< |
double b; |
| 122 |
> |
static int cerr[NCOLS][3]; |
| 123 |
> |
static int err[3]; |
| 124 |
> |
int b; |
| 125 |
|
register int ison; |
| 126 |
|
|
| 127 |
< |
b = colval(col,a); |
| 116 |
< |
if (b > 1.0) b = 1.0; |
| 127 |
> |
b = col[a]; |
| 128 |
|
err[a] += b + cerr[x][a]; |
| 129 |
< |
ison = err[a] > 0.5; |
| 130 |
< |
if (ison) err[a] -= 1.0; |
| 131 |
< |
cerr[x][a] = err[a] *= 0.5; |
| 129 |
> |
ison = err[a] > 128; |
| 130 |
> |
if (ison) err[a] -= 256; |
| 131 |
> |
cerr[x][a] = err[a] /= 2; |
| 132 |
|
return(ison); |
| 133 |
|
} |
