| 45 |
|
{ |
| 46 |
|
FILE *input; |
| 47 |
|
int xres, yres; |
| 48 |
< |
COLOR scanline[NCOLS]; |
| 48 |
> |
COLR scanline[NCOLS]; |
| 49 |
|
int i; |
| 50 |
|
|
| 51 |
|
if (fname == NULL) { |
| 67 |
|
return(-1); |
| 68 |
|
} |
| 69 |
|
/* set line spacing (overlap for knitting) */ |
| 70 |
< |
fputs("\0333\036", stdout); |
| 70 |
> |
fputs("\0333\042", stdout); |
| 71 |
|
/* put out scanlines */ |
| 72 |
|
for (i = yres-1; i >= 0; i--) { |
| 73 |
< |
if (freadscan(scanline, xres, input) < 0) { |
| 73 |
> |
if (freadcolrs(scanline, xres, input) < 0) { |
| 74 |
|
fprintf(stderr, "%s: read error (y=%d)\n", fname, i); |
| 75 |
|
return(-1); |
| 76 |
|
} |
| 77 |
+ |
normscan(scanline, xres); |
| 78 |
|
plotscan(scanline, xres, i); |
| 79 |
|
} |
| 80 |
|
/* advance page */ |
| 86 |
|
} |
| 87 |
|
|
| 88 |
|
|
| 89 |
+ |
normscan(scan, len) /* normalize a scanline */ |
| 90 |
+ |
register COLR scan[]; |
| 91 |
+ |
int len; |
| 92 |
+ |
{ |
| 93 |
+ |
register int i; |
| 94 |
+ |
|
| 95 |
+ |
for (i = 0; i < len; i++) |
| 96 |
+ |
colr_norm(scan[i], scan[i]); |
| 97 |
+ |
} |
| 98 |
+ |
|
| 99 |
+ |
|
| 100 |
|
plotscan(scan, len, y) /* plot a scanline */ |
| 101 |
< |
COLOR scan[]; |
| 101 |
> |
COLR scan[]; |
| 102 |
|
int len; |
| 103 |
|
int y; |
| 104 |
|
{ |
| 107 |
|
register long c; |
| 108 |
|
register int i, j; |
| 109 |
|
|
| 110 |
< |
if (bpos = y % 20) { |
| 110 |
> |
if (bpos = y % 23) { |
| 111 |
|
|
| 112 |
< |
if (y > 20 & bpos < 4) /* knit bits */ |
| 113 |
< |
for (j = 0; j < 3; j++) |
| 114 |
< |
for (i = 0; i < len; i++) |
| 103 |
< |
pat[i][j] |= (long)colbit(scan[i],i,j) |
| 104 |
< |
<< (i+j & 4 ? bpos+24 : bpos); |
| 105 |
< |
else |
| 106 |
< |
for (j = 0; j < 3; j++) |
| 107 |
< |
for (i = 0; i < len; i++) |
| 108 |
< |
pat[i][j] |= (long)colbit(scan[i],i,j) |
| 109 |
< |
<< bpos; |
| 112 |
> |
for (j = 0; j < 3; j++) |
| 113 |
> |
for (i = 0; i < len; i++) |
| 114 |
> |
pat[i][j] |= (long)colbit(scan[i],i,j) << bpos; |
| 115 |
|
|
| 116 |
|
} else { |
| 117 |
|
|
| 119 |
|
|
| 120 |
|
for (j = 0; j < 3; j++) { |
| 121 |
|
fputs("\033%O", stdout); |
| 122 |
< |
putchar(len & 0xff); |
| 122 |
> |
putchar(len & 255); |
| 123 |
|
putchar(len >> 8); |
| 124 |
|
for (i = 0; i < len; i++) { |
| 125 |
< |
c = pat[i][j]; |
| 126 |
< |
pat[i][j] = c>>4 & 0xf00000; |
| 127 |
< |
if (i+j & 4) /* knit last bit */ |
| 128 |
< |
pat[i][j] |= colbit(scan[i],i,j) << 20; |
| 129 |
< |
else |
| 130 |
< |
c |= colbit(scan[i],i,j); |
| 126 |
< |
putchar(c>>16 & 0xff); |
| 127 |
< |
putchar(c>>8 & 0xff); |
| 128 |
< |
putchar(c & 0xff); |
| 125 |
> |
c = pat[i][j] | colbit(scan[i],i,j); |
| 126 |
> |
/* repeat this row */ |
| 127 |
> |
pat[i][j] = (c & 1) << 23; |
| 128 |
> |
putchar(c>>16); |
| 129 |
> |
putchar(c>>8 & 255); |
| 130 |
> |
putchar(c & 255); |
| 131 |
|
} |
| 132 |
|
putchar('\r'); |
| 133 |
|
} |
| 137 |
|
|
| 138 |
|
|
| 139 |
|
colbit(col, x, s) /* determine bit value for primary at x */ |
| 140 |
< |
COLOR col; |
| 140 |
> |
COLR col; |
| 141 |
|
register int x; |
| 142 |
|
int s; |
| 143 |
|
{ |
| 144 |
< |
static float cerr[NCOLS][3]; |
| 145 |
< |
static double err[3]; |
| 146 |
< |
double b; |
| 144 |
> |
static int cerr[NCOLS][3]; |
| 145 |
> |
static int err[3]; |
| 146 |
> |
int b; |
| 147 |
|
register int a, ison; |
| 148 |
|
|
| 149 |
|
a = sub_add(s); /* use additive primary */ |
| 150 |
< |
b = colval(col,a); |
| 149 |
< |
if (b > 1.0) b = 1.0; |
| 150 |
> |
b = col[a]; |
| 151 |
|
err[a] += b + cerr[x][a]; |
| 152 |
< |
ison = err[a] < 0.5; |
| 153 |
< |
if (!ison) err[a] -= 1.0; |
| 154 |
< |
cerr[x][a] = err[a] *= 0.5; |
| 152 |
> |
ison = err[a] < 128; |
| 153 |
> |
if (!ison) err[a] -= 256; |
| 154 |
> |
cerr[x][a] = err[a] /= 2; |
| 155 |
|
return(ison); |
| 156 |
|
} |
