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#ifndef lint |
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static const char RCSid[] = "$Id: pextrem.c,v 2.15 2022/02/04 20:11:49 greg Exp $"; |
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#endif |
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/* |
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* Find extrema points in a Radiance picture (RGBE, XYZE, or HyperSpectral) |
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*/ |
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|
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#include <math.h> |
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|
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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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|
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|
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int orig = 0; |
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|
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COLOR expos = WHTCOLOR; |
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|
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char fmt[MAXFMTLEN]; |
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|
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static gethfunc headline; |
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|
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|
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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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double d; |
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COLOR ctmp; |
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|
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if (formatval(fmt, s)) /* format */ |
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return(0); |
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if (iswlsplit(s)) { /* wavelength splits */ |
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wlsplitval(WLPART, s); |
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return(0); |
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} |
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if (isncomp(s)) { /* # spectral components */ |
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NCSAMP = ncompval(s); |
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return(0); |
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} |
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if (!orig) /* don't undo exposure? */ |
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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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|
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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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int x; |
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COLRV *scan; |
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SCOLR cmin, cmax; |
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COLOR tcol; |
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int xmin, ymin, xmax, ymax; |
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|
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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 = 1; |
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else if (!strcmp(argv[i], "-O")) |
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orig = -1; |
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else |
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break; |
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|
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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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return(1); |
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} |
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/* get our header */ |
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if (getheader(stdin, headline, NULL) < 0 || |
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(!globmatch(PICFMT, fmt) && strcmp(fmt, SPECFMT)) || |
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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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return(1); |
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} |
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if (setspectrsamp(CNDX, WLPART) < 0) { |
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fprintf(stderr, "%s: bad wavelength split or component count", |
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argv[0]); |
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return(1); |
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} |
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if (orig < 0 && !strcmp(CIEFMT, fmt)) |
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scalecolor(expos, 1./WHTEFFICACY); |
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if ((scan = (COLRV *)malloc(xres*sizeof(COLRV)*(NCSAMP+1))) == NULL) { |
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fprintf(stderr, "%s: out of memory\n", argv[0]); |
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return(1); |
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} |
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setscolr(cmin, 1e30, 1e30, 1e30); xmin=ymin=0; |
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scolrblack(cmax); 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 (freadscolrs(scan, NCSAMP, xres, stdin) < 0) { |
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fprintf(stderr, "%s: read error on input\n", argv[0]); |
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return(1); |
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} |
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for (x = xres; x-- > 0; ) { |
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const COLRV * sclr = scan + x*(NCSAMP+1); |
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if (sclr[CNDX[EXP]] > cmax[CNDX[EXP]] || |
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(sclr[CNDX[EXP]] == cmax[CNDX[EXP]] && |
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normpbright(sclr) > normpbright(cmax))) { |
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copyscolr(cmax, sclr); |
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xmax = x; ymax = y; |
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} |
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if (sclr[CNDX[EXP]] < cmin[CNDX[EXP]] || |
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(sclr[CNDX[EXP]] == cmin[CNDX[EXP]] && |
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normpbright(sclr) < normpbright(cmin))) { |
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copyscolr(cmin, sclr); |
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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(scan); |
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scolr_color(tcol, cmin); |
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printf("%d %d\t%.2e %.2e %.2e\n", xmin, ymin, |
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colval(tcol,RED)/colval(expos,RED), |
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colval(tcol,GRN)/colval(expos,GRN), |
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colval(tcol,BLU)/colval(expos,BLU)); |
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scolr_color(tcol, cmax); |
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printf("%d %d\t%.2e %.2e %.2e\n", xmax, ymax, |
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colval(tcol,RED)/colval(expos,RED), |
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colval(tcol,GRN)/colval(expos,GRN), |
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colval(tcol,BLU)/colval(expos,BLU)); |
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return(0); |
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} |
