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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* pf2.c - routines used by pfilt. |
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* |
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* 10/3/85 |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <math.h> |
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#include "random.h" |
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#include "color.h" |
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extern COLOR exposure; /* exposure for frame */ |
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extern double (*ourbright)(); /* brightness calculation function */ |
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#define AVGLVL 0.5 /* target mean brightness */ |
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double avgbrt; /* average picture brightness */ |
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long npix; /* # pixels in average */ |
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typedef struct hotpix { /* structure for avgbrt pixels */ |
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struct hotpix *next; /* next in list */ |
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pass1init() /* prepare for first pass */ |
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{ |
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avgbrt = 0.0; |
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npix = 0; |
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head = NULL; |
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} |
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pass1default() /* for single pass */ |
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{ |
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avgbrt = AVGLVL * xres * yres; |
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avgbrt = AVGLVL; |
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npix = 1; |
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head = NULL; |
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} |
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register COLOR *scan; |
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int y; |
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{ |
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extern char *malloc(); |
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extern double tan(), sqrt(); |
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double cbrt; |
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register int x; |
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register HOTPIX *hp; |
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for (x = 0; x < xres; x++) { |
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cbrt = bright(scan[x]); |
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cbrt = (*ourbright)(scan[x]); |
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if (avghot || cbrt < hotlvl) |
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avgbrt += cbrt; |
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if (cbrt <= 0) |
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continue; |
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if (avghot || cbrt < hotlvl) { |
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avgbrt += cbrt; |
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npix++; |
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} |
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if (npts && cbrt >= hotlvl) { |
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hp = (HOTPIX *)malloc(sizeof(HOTPIX)); |
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if (hp == NULL) { |
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pass2init() /* prepare for final pass */ |
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{ |
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avgbrt /= (double)xres * yres; |
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if (avgbrt <= FTINY) { |
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fprintf(stderr, "%s: picture too dark\n", progname); |
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if (!npix) { |
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fprintf(stderr, "%s: picture too dark or too bright\n", |
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progname); |
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quit(1); |
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} |
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avgbrt /= (double)npix; |
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scalecolor(exposure, AVGLVL/avgbrt); |
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sprdfact = spread / (hotlvl * bright(exposure)) |
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sprdfact = spread / (hotlvl * (*ourbright)(exposure)) |
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* ((double)xres*xres + (double)yres*yres) / 4.0; |
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} |
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