1 |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* greyscale.c - program to produce grey test levels. |
9 |
* |
10 |
* 4/21/86 |
11 |
*/ |
12 |
|
13 |
#include <stdio.h> |
14 |
|
15 |
#include <math.h> |
16 |
|
17 |
#include "color.h" |
18 |
|
19 |
|
20 |
double minlog = 0.0; /* minimum for log scale (0 == linear) */ |
21 |
|
22 |
|
23 |
main(argc, argv) |
24 |
int argc; |
25 |
char *argv[]; |
26 |
{ |
27 |
COLOR col; |
28 |
double d1,d2,d3; |
29 |
int i; |
30 |
|
31 |
printargs(argc, argv, stdout); |
32 |
|
33 |
setcolor(col, 1.0, 1.0, 1.0); |
34 |
|
35 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
36 |
switch (argv[i][1]) { |
37 |
case 'c': |
38 |
d1 = atof(argv[++i]); |
39 |
d2 = atof(argv[++i]); |
40 |
d3 = atof(argv[++i]); |
41 |
setcolor(col, d1, d2, d3); |
42 |
break; |
43 |
case 'l': |
44 |
d1 = atof(argv[++i]); |
45 |
if (d1 <= 0.0) |
46 |
minlog = 0.0; |
47 |
else |
48 |
minlog = log(d1); |
49 |
break; |
50 |
default: |
51 |
fprintf(stderr, "%s: unknown option \"%s\"\n", |
52 |
argv[0], argv[i]); |
53 |
exit(1); |
54 |
} |
55 |
|
56 |
printf("\n"); |
57 |
printf("-Y 512 +X 512\n"); |
58 |
greyscale(col); |
59 |
} |
60 |
|
61 |
|
62 |
greyscale(col0) /* output our grey scale */ |
63 |
COLOR col0; |
64 |
{ |
65 |
extern double exp(); |
66 |
COLOR col1, col2, scanline[512]; |
67 |
double x; |
68 |
int j; |
69 |
register int i, k; |
70 |
|
71 |
for (j = 0; j < 512; j += 32) { |
72 |
for (k = 0; k < 512; k++) |
73 |
setcolor(scanline[k], 0.0, 0.0, 0.0); |
74 |
for (k = 0; k < 4; k++) |
75 |
if (fwritescan(scanline, 512, stdout) < 0) |
76 |
goto writerr; |
77 |
x = j/32 / 16.0; |
78 |
if (minlog != 0.0) |
79 |
x = exp((1.0-x)*minlog); |
80 |
setcolor(col1, x, x, x); |
81 |
|
82 |
for (i = 0; i < 512; i += 32) { |
83 |
for (k = 0; k < 4; k++) |
84 |
setcolor(scanline[i+k], 0.0, 0.0, 0.0); |
85 |
x = i/32 / 255.0; |
86 |
if (minlog != 0.0) { |
87 |
x = exp(-x*minlog); |
88 |
setcolor(col2, x, x, x); |
89 |
multcolor(col2, col1); |
90 |
} else { |
91 |
setcolor(col2, x, x, x); |
92 |
addcolor(col2, col1); |
93 |
} |
94 |
multcolor(col2, col0); |
95 |
for (k = 4; k < 32; k++) |
96 |
copycolor(scanline[i+k], col2); |
97 |
} |
98 |
for (i = 0; i < 28; i++) |
99 |
if (fwritescan(scanline, 512, stdout) < 0) |
100 |
goto writerr; |
101 |
} |
102 |
return; |
103 |
writerr: |
104 |
fprintf(stderr, "write error in greyscale\n"); |
105 |
exit(1); |
106 |
} |
107 |
|
108 |
|
109 |
printargs(ac, av, fp) /* print arguments to a file */ |
110 |
int ac; |
111 |
char **av; |
112 |
FILE *fp; |
113 |
{ |
114 |
while (ac-- > 0) { |
115 |
fputs(*av++, fp); |
116 |
putc(' ', fp); |
117 |
} |
118 |
putc('\n', fp); |
119 |
} |