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#ifndef lint |
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static const char RCSid[] = "$Id: pextrem.c,v 2.14 2019/07/19 17:37:56 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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|
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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 (!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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|
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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 = 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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exit(1); |
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} |
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/* get our header */ |
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if (getheader(stdin, headline, NULL) < 0 || !globmatch(PICFMT, fmt) || |
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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 (orig < 0 && !strcmp(CIEFMT, fmt)) |
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scalecolor(expos, 1./WHTEFFICACY); |
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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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} |
