| 24 |
|
|
| 25 |
|
#define sub_add(sub) (2-(sub)) /* map subtractive to additive pri. */ |
| 26 |
|
|
| 27 |
+ |
#ifdef BSD |
| 28 |
+ |
#define clearlbuf() bzero((char *)lpat, sizeof(lpat)) |
| 29 |
+ |
#else |
| 30 |
+ |
#define clearlbuf() (void)memset((char *)lpat, 0, sizeof(lpat)) |
| 31 |
+ |
#endif |
| 32 |
|
|
| 33 |
+ |
long lpat[NCOLS][3]; |
| 34 |
+ |
|
| 35 |
+ |
|
| 36 |
|
main(argc, argv) |
| 37 |
|
int argc; |
| 38 |
|
char *argv[]; |
| 53 |
|
{ |
| 54 |
|
FILE *input; |
| 55 |
|
int xres, yres; |
| 56 |
< |
COLOR scanline[NCOLS]; |
| 56 |
> |
COLR scanline[NCOLS]; |
| 57 |
|
int i; |
| 58 |
|
|
| 59 |
|
if (fname == NULL) { |
| 64 |
|
return(-1); |
| 65 |
|
} |
| 66 |
|
/* discard header */ |
| 67 |
< |
getheader(input, NULL); |
| 67 |
> |
if (checkheader(input, COLRFMT, NULL) < 0) { |
| 68 |
> |
fprintf(stderr, "%s: not a Radiance picture\n", fname); |
| 69 |
> |
return(-1); |
| 70 |
> |
} |
| 71 |
|
/* get picture dimensions */ |
| 72 |
|
if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) { |
| 73 |
|
fprintf(stderr, "%s: bad picture size\n", fname); |
| 79 |
|
} |
| 80 |
|
/* set line spacing (overlap for knitting) */ |
| 81 |
|
fputs("\0333\042", stdout); |
| 82 |
+ |
/* clear line buffer */ |
| 83 |
+ |
clearlbuf(); |
| 84 |
|
/* put out scanlines */ |
| 85 |
|
for (i = yres-1; i >= 0; i--) { |
| 86 |
< |
if (freadscan(scanline, xres, input) < 0) { |
| 86 |
> |
if (freadcolrs(scanline, xres, input) < 0) { |
| 87 |
|
fprintf(stderr, "%s: read error (y=%d)\n", fname, i); |
| 88 |
|
return(-1); |
| 89 |
|
} |
| 90 |
+ |
normcolrs(scanline, xres, 0); |
| 91 |
|
plotscan(scanline, xres, i); |
| 92 |
|
} |
| 93 |
|
/* advance page */ |
| 100 |
|
|
| 101 |
|
|
| 102 |
|
plotscan(scan, len, y) /* plot a scanline */ |
| 103 |
< |
COLOR scan[]; |
| 103 |
> |
COLR scan[]; |
| 104 |
|
int len; |
| 105 |
|
int y; |
| 106 |
|
{ |
| 93 |
– |
static long pat[NCOLS][3]; |
| 107 |
|
int bpos; |
| 108 |
|
register long c; |
| 109 |
|
register int i, j; |
| 112 |
|
|
| 113 |
|
for (j = 0; j < 3; j++) |
| 114 |
|
for (i = 0; i < len; i++) |
| 115 |
< |
pat[i][j] |= (long)colbit(scan[i],i,j) << bpos; |
| 115 |
> |
lpat[i][j] |= (long)colbit(scan[i],i,j) << bpos; |
| 116 |
|
|
| 117 |
|
} else { |
| 118 |
|
|
| 123 |
|
putchar(len & 255); |
| 124 |
|
putchar(len >> 8); |
| 125 |
|
for (i = 0; i < len; i++) { |
| 126 |
< |
if (y!=0 & i+j) { /* knit bit */ |
| 127 |
< |
c = pat[i][j]; |
| 128 |
< |
pat[i][j] = colbit(scan[i],i,j) << 23; |
| 116 |
< |
} else { |
| 117 |
< |
c = pat[i][j] | colbit(scan[i],i,j); |
| 118 |
< |
pat[i][j] = 0; |
| 119 |
< |
} |
| 126 |
> |
c = lpat[i][j] | colbit(scan[i],i,j); |
| 127 |
> |
/* repeat this row */ |
| 128 |
> |
lpat[i][j] = (c & 1) << 23; |
| 129 |
|
putchar(c>>16); |
| 130 |
|
putchar(c>>8 & 255); |
| 131 |
|
putchar(c & 255); |
| 138 |
|
|
| 139 |
|
|
| 140 |
|
colbit(col, x, s) /* determine bit value for primary at x */ |
| 141 |
< |
COLOR col; |
| 141 |
> |
COLR col; |
| 142 |
|
register int x; |
| 143 |
|
int s; |
| 144 |
|
{ |
| 145 |
< |
static float cerr[NCOLS][3]; |
| 146 |
< |
static double err[3]; |
| 147 |
< |
double b; |
| 145 |
> |
static int cerr[NCOLS][3]; |
| 146 |
> |
static int err[3], errp[3]; |
| 147 |
> |
int b; |
| 148 |
|
register int a, ison; |
| 149 |
|
|
| 150 |
|
a = sub_add(s); /* use additive primary */ |
| 151 |
< |
b = colval(col,a); |
| 152 |
< |
if (b > 1.0) b = 1.0; |
| 151 |
> |
b = col[a]; |
| 152 |
> |
errp[a] = err[a]; |
| 153 |
|
err[a] += b + cerr[x][a]; |
| 154 |
< |
ison = err[a] < 0.5; |
| 155 |
< |
if (!ison) err[a] -= 1.0; |
| 156 |
< |
cerr[x][a] = err[a] *= 0.5; |
| 154 |
> |
ison = err[a] < 128; |
| 155 |
> |
if (!ison) err[a] -= 256; |
| 156 |
> |
err[a] /= 3; |
| 157 |
> |
cerr[x][a] = err[a] + errp[a]; |
| 158 |
|
return(ison); |
| 159 |
|
} |
