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#ifndef lint
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static const char RCSid[] = "$Id: pextrem.c,v 2.13 2018/08/02 18:33:44 greg Exp $";
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#endif
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/*
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* Find extrema points in a Radiance picture.
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*/
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#include <math.h>
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#include "rtio.h"
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#include "platform.h"
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#include "color.h"
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#include "resolu.h"
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int orig = 0;
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int wrongformat = 0;
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COLOR expos = WHTCOLOR;
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static gethfunc headline;
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static int
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headline( /* check header line */
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char *s,
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void *p
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)
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{
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char fmt[MAXFMTLEN];
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double d;
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COLOR ctmp;
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if (isformat(s)) { /* format */
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formatval(fmt, s);
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wrongformat = !globmatch(PICFMT, fmt);
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}
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if (!orig)
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return(0);
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if (isexpos(s)) { /* exposure */
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d = exposval(s);
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scalecolor(expos, d);
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} else if (iscolcor(s)) { /* color correction */
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colcorval(ctmp, s);
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multcolor(expos, ctmp);
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}
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return(0);
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}
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int
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main(
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int argc,
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char *argv[]
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)
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{
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int i;
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int xres, yres;
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int y;
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register int x;
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COLR *scan;
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COLR cmin, cmax;
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int xmin, ymin, xmax, ymax;
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SET_DEFAULT_BINARY();
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SET_FILE_BINARY(stdin);
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for (i = 1; i < argc; i++) /* get options */
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if (!strcmp(argv[i], "-o"))
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orig++;
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else
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break;
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if (i == argc-1 && freopen(argv[i], "r", stdin) == NULL) {
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fprintf(stderr, "%s: can't open input \"%s\"\n",
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argv[0], argv[i]);
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exit(1);
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}
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/* get our header */
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if (getheader(stdin, headline, NULL) < 0 || wrongformat ||
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fgetresolu(&xres, &yres, stdin) < 0) {
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fprintf(stderr, "%s: bad picture format\n", argv[0]);
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exit(1);
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}
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if ((scan = (COLR *)malloc(xres*sizeof(COLR))) == NULL) {
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fprintf(stderr, "%s: out of memory\n", argv[0]);
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exit(1);
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}
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setcolr(cmin, 1e30, 1e30, 1e30);
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setcolr(cmax, 0., 0., 0.); xmax=ymax=0;
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/* find extrema */
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for (y = yres-1; y >= 0; y--) {
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if (freadcolrs(scan, xres, stdin) < 0) {
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fprintf(stderr, "%s: read error on input\n", argv[0]);
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exit(1);
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}
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for (x = xres; x-- > 0; ) {
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if (scan[x][EXP] > cmax[EXP] ||
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(scan[x][EXP] == cmax[EXP] &&
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normbright(scan[x]) >
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normbright(cmax))) {
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copycolr(cmax, scan[x]);
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xmax = x; ymax = y;
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}
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if (scan[x][EXP] < cmin[EXP] ||
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(scan[x][EXP] == cmin[EXP] &&
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normbright(scan[x]) <
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normbright(cmin))) {
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copycolr(cmin, scan[x]);
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xmin = x; ymin = y;
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}
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}
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}
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free((void *)scan);
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printf("%d %d\t%.2e %.2e %.2e\n", xmin, ymin,
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colrval(cmin,RED)/colval(expos,RED),
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colrval(cmin,GRN)/colval(expos,GRN),
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colrval(cmin,BLU)/colval(expos,BLU));
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printf("%d %d\t%.2e %.2e %.2e\n", xmax, ymax,
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colrval(cmax,RED)/colval(expos,RED),
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colrval(cmax,GRN)/colval(expos,GRN),
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colrval(cmax,BLU)/colval(expos,BLU));
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exit(0);
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}
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