1 |
gwlarson |
3.1 |
#ifndef lint |
2 |
greg |
3.6 |
static const char RCSid[] = "$Id: ra_hexbit.c,v 3.5 2018/04/17 17:42:28 greg Exp $"; |
3 |
gwlarson |
3.1 |
#endif |
4 |
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/* |
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* Create a 4x1 hex bitmap from a Radiance picture. |
6 |
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*/ |
7 |
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8 |
greg |
3.5 |
#include "platform.h" |
9 |
gwlarson |
3.1 |
#include "color.h" |
10 |
greg |
3.4 |
#include "rtio.h" |
11 |
gwlarson |
3.1 |
#include "resolu.h" |
12 |
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13 |
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char *progname; |
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int xmax, ymax; |
15 |
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double thresh = 0.5; /* threshold value */ |
16 |
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COLR threshclr; |
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18 |
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#define abovethresh(c) ((c)[EXP]>threshclr[EXP] || \ |
19 |
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((c)[EXP]==threshclr[EXP] && (c)[GRN]>threshclr[GRN])) |
20 |
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21 |
schorsch |
3.3 |
static void quiterr(char *err); |
22 |
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static void ra2hex(void); |
23 |
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24 |
gwlarson |
3.1 |
|
25 |
schorsch |
3.3 |
int |
26 |
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main( |
27 |
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int argc, |
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char *argv[] |
29 |
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) |
30 |
gwlarson |
3.1 |
{ |
31 |
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int i; |
32 |
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33 |
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progname = argv[0]; |
34 |
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35 |
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for (i = 1; i < argc; i++) |
36 |
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if (argv[i][0] == '-') |
37 |
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switch (argv[i][1]) { |
38 |
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case 't': /* threshold value */ |
39 |
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thresh = atof(argv[++i]); |
40 |
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break; |
41 |
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default: |
42 |
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goto userr; |
43 |
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} |
44 |
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else |
45 |
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break; |
46 |
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47 |
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if (i < argc-2) |
48 |
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goto userr; |
49 |
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if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
50 |
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fprintf(stderr, "%s: can't open input \"%s\"\n", |
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progname, argv[i]); |
52 |
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exit(1); |
53 |
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} |
54 |
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if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
55 |
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fprintf(stderr, "%s: can't open output \"%s\"\n", |
56 |
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progname, argv[i+1]); |
57 |
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exit(1); |
58 |
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} |
59 |
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/* assign threshold color */ |
60 |
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setcolr(threshclr, thresh, thresh, thresh); |
61 |
greg |
3.5 |
/* binary input */ |
62 |
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SET_FILE_BINARY(stdin); |
63 |
gwlarson |
3.1 |
/* get our header */ |
64 |
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if (checkheader(stdin, COLRFMT, NULL) < 0 || |
65 |
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fgetresolu(&xmax, &ymax, stdin) < 0) |
66 |
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quiterr("bad picture format"); |
67 |
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/* convert file */ |
68 |
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ra2hex(); |
69 |
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exit(0); |
70 |
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userr: |
71 |
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fprintf(stderr, |
72 |
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"Usage: %s [-t thresh] [input [output]]\n", progname); |
73 |
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exit(1); |
74 |
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} |
75 |
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76 |
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77 |
schorsch |
3.3 |
static void |
78 |
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quiterr( /* print message and exit */ |
79 |
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char *err |
80 |
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) |
81 |
gwlarson |
3.1 |
{ |
82 |
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if (err != NULL) { |
83 |
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fprintf(stderr, "%s: %s\n", progname, err); |
84 |
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exit(1); |
85 |
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} |
86 |
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exit(0); |
87 |
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} |
88 |
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89 |
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90 |
schorsch |
3.3 |
static void |
91 |
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ra2hex(void) /* convert Radiance scanlines to 4x1 bit hex */ |
92 |
gwlarson |
3.1 |
{ |
93 |
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static char cmap[] = "0123456789ABCDEF"; |
94 |
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COLR *scanin; |
95 |
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register int x, c, t; |
96 |
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int y; |
97 |
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/* allocate scanline */ |
98 |
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scanin = (COLR *)malloc(xmax*sizeof(COLR)); |
99 |
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if (scanin == NULL) |
100 |
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quiterr("out of memory in ra2skel"); |
101 |
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/* convert image */ |
102 |
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for (y = ymax-1; y >= 0; y--) { |
103 |
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if (freadcolrs(scanin, xmax, stdin) < 0) |
104 |
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quiterr("error reading Radiance picture"); |
105 |
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c = 0; |
106 |
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for (x = 0; x < xmax; x++) |
107 |
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if ((t = 03 - (x&03))) |
108 |
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c |= abovethresh(scanin[x]) << t; |
109 |
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else { |
110 |
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c |= abovethresh(scanin[x]); |
111 |
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putchar(cmap[c]); |
112 |
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c = 0; |
113 |
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} |
114 |
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if (t) |
115 |
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fputc(cmap[c], stdout); |
116 |
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fputc('\n', stdout); |
117 |
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if (ferror(stdout)) |
118 |
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quiterr("error writing hex bit file"); |
119 |
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} |
120 |
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/* free scanline */ |
121 |
greg |
3.2 |
free((void *)scanin); |
122 |
gwlarson |
3.1 |
} |