| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: pextrem.c,v 2.7 2003/06/08 12:03:10 schorsch Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Find extrema points in a Radiance picture. |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <stdio.h> |
| 9 |
#include <math.h> |
| 10 |
#include <string.h> |
| 11 |
|
| 12 |
#include "platform.h" |
| 13 |
#include "color.h" |
| 14 |
|
| 15 |
|
| 16 |
int orig = 0; |
| 17 |
|
| 18 |
int wrongformat = 0; |
| 19 |
|
| 20 |
COLOR expos = WHTCOLOR; |
| 21 |
|
| 22 |
|
| 23 |
headline(s) /* check header line */ |
| 24 |
char *s; |
| 25 |
{ |
| 26 |
char fmt[32]; |
| 27 |
double d; |
| 28 |
COLOR ctmp; |
| 29 |
|
| 30 |
if (isformat(s)) { /* format */ |
| 31 |
formatval(fmt, s); |
| 32 |
wrongformat = !globmatch(PICFMT, fmt); |
| 33 |
} |
| 34 |
if (!orig) |
| 35 |
return(0); |
| 36 |
if (isexpos(s)) { /* exposure */ |
| 37 |
d = exposval(s); |
| 38 |
scalecolor(expos, d); |
| 39 |
} else if (iscolcor(s)) { /* color correction */ |
| 40 |
colcorval(ctmp, s); |
| 41 |
multcolor(expos, ctmp); |
| 42 |
} |
| 43 |
return(0); |
| 44 |
} |
| 45 |
|
| 46 |
|
| 47 |
main(argc, argv) |
| 48 |
int argc; |
| 49 |
char *argv[]; |
| 50 |
{ |
| 51 |
int i; |
| 52 |
int xres, yres; |
| 53 |
int y; |
| 54 |
register int x; |
| 55 |
COLR *scan; |
| 56 |
COLR cmin, cmax; |
| 57 |
int xmin, ymin, xmax, ymax; |
| 58 |
SET_DEFAULT_BINARY(); |
| 59 |
SET_FILE_BINARY(stdin); |
| 60 |
for (i = 1; i < argc; i++) /* get options */ |
| 61 |
if (!strcmp(argv[i], "-o")) |
| 62 |
orig++; |
| 63 |
else |
| 64 |
break; |
| 65 |
|
| 66 |
if (i == argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
| 67 |
fprintf(stderr, "%s: can't open input \"%s\"\n", |
| 68 |
argv[0], argv[i]); |
| 69 |
exit(1); |
| 70 |
} |
| 71 |
/* get our header */ |
| 72 |
if (getheader(stdin, headline, NULL) < 0 || wrongformat || |
| 73 |
fgetresolu(&xres, &yres, stdin) < 0) { |
| 74 |
fprintf(stderr, "%s: bad picture format\n", argv[0]); |
| 75 |
exit(1); |
| 76 |
} |
| 77 |
if ((scan = (COLR *)malloc(xres*sizeof(COLR))) == NULL) { |
| 78 |
fprintf(stderr, "%s: out of memory\n", argv[0]); |
| 79 |
exit(1); |
| 80 |
} |
| 81 |
setcolr(cmin, 1e10, 1e10, 1e10); |
| 82 |
setcolr(cmax, 0., 0., 0.); |
| 83 |
/* find extrema */ |
| 84 |
for (y = yres-1; y >= 0; y--) { |
| 85 |
if (freadcolrs(scan, xres, stdin) < 0) { |
| 86 |
fprintf(stderr, "%s: read error on input\n", argv[0]); |
| 87 |
exit(1); |
| 88 |
} |
| 89 |
for (x = xres; x-- > 0; ) { |
| 90 |
if (scan[x][EXP] > cmax[EXP] || |
| 91 |
(scan[x][EXP] == cmax[EXP] && |
| 92 |
normbright(scan[x]) > |
| 93 |
normbright(cmax))) { |
| 94 |
copycolr(cmax, scan[x]); |
| 95 |
xmax = x; ymax = y; |
| 96 |
} |
| 97 |
if (scan[x][EXP] < cmin[EXP] || |
| 98 |
(scan[x][EXP] == cmin[EXP] && |
| 99 |
normbright(scan[x]) < |
| 100 |
normbright(cmin))) { |
| 101 |
copycolr(cmin, scan[x]); |
| 102 |
xmin = x; ymin = y; |
| 103 |
} |
| 104 |
} |
| 105 |
} |
| 106 |
free((void *)scan); |
| 107 |
printf("%d %d\t%e %e %e\n", xmin, ymin, |
| 108 |
colrval(cmin,RED)/colval(expos,RED), |
| 109 |
colrval(cmin,GRN)/colval(expos,GRN), |
| 110 |
colrval(cmin,BLU)/colval(expos,BLU)); |
| 111 |
printf("%d %d\t%e %e %e\n", xmax, ymax, |
| 112 |
colrval(cmax,RED)/colval(expos,RED), |
| 113 |
colrval(cmax,GRN)/colval(expos,GRN), |
| 114 |
colrval(cmax,BLU)/colval(expos,BLU)); |
| 115 |
exit(0); |
| 116 |
} |
