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/* Copyright (c) 1997 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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* Input and output conditioning routines for pcond. |
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* Added white-balance adjustment 10/01 (GW). |
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*/ |
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#include "pcond.h" |
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static COLOR *scanbuf; /* scanline processing buffer */ |
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static int nread; /* number of scanlines processed */ |
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static void sfscan(COLOR *sl, int len, double sf); |
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static void matscan(COLOR *sl, int len, COLORMAT mat); |
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static void mbscan(COLOR *sl, int len, struct mbc *mb); |
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static void cwscan(COLOR *sl, int len, WARP3D *wp); |
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static void getmbcalfile(char *fn, struct mbc *mb); |
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double |
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rgblum(clr, scotopic) /* compute (scotopic) luminance of RGB color */ |
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COLOR clr; |
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int scotopic; |
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|
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extern double |
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rgblum( /* compute (scotopic) luminance of RGB color */ |
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COLOR clr, |
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int scotopic |
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) |
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{ |
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if (scotopic) /* approximate */ |
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return( WHTSEFFICACY * (colval(clr,RED)*.062 + |
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} |
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double |
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cielum(xyz, scotopic) /* compute (scotopic) luminance of CIE color */ |
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COLOR xyz; |
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int scotopic; |
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extern double |
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cielum( /* compute (scotopic) luminance of CIE color */ |
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COLOR xyz, |
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int scotopic |
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) |
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{ |
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if (scotopic) /* approximate */ |
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return(colval(xyz,CIEY) * |
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} |
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COLOR * |
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nextscan() /* read and condition next scanline */ |
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extern COLOR * |
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nextscan(void) /* read and condition next scanline */ |
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{ |
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if (nread >= numscans(&inpres)) { |
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if (cwarpfile != NULL) |
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free3dw(cwarp); |
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free((char *)scanbuf); |
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free((void *)scanbuf); |
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return(scanbuf = NULL); |
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} |
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if (what2do&DO_ACUITY) |
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mbscan(scanbuf, scanlen(&inpres), &mbcond); |
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else if (cwarpfile != NULL) /* device color space warp */ |
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cwscan(scanbuf, scanlen(&inpres), cwarp); |
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else if (lumf == cielum | inprims != outprims) |
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else if ((lumf == cielum) | (inprims != outprims)) |
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matscan(scanbuf, scanlen(&inpres), mbcond.cmat); |
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nread++; |
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return(scanbuf); |
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} |
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COLOR * |
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firstscan() /* return first processed scanline */ |
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extern COLOR * |
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firstscan(void) /* return first processed scanline */ |
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{ |
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if (mbcalfile != NULL) /* load macbethcal file */ |
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getmbcalfile(mbcalfile, &mbcond); |
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syserror(cwarpfile); |
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} else |
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if (lumf == rgblum) |
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comprgb2rgbmat(mbcond.cmat, inprims, outprims); |
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comprgb2rgbWBmat(mbcond.cmat, inprims, outprims); |
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else |
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compxyz2rgbmat(mbcond.cmat, outprims); |
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compxyz2rgbWBmat(mbcond.cmat, outprims); |
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if (what2do&DO_ACUITY) |
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initacuity(); |
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scanbuf = (COLOR *)malloc(scanlen(&inpres)*sizeof(COLOR)); |
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} |
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sfscan(sl, len, sf) /* apply scalefactor to scanline */ |
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register COLOR *sl; |
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int len; |
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double sf; |
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static void |
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sfscan( /* apply scalefactor to scanline */ |
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register COLOR *sl, |
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int len, |
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double sf |
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) |
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{ |
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while (len--) { |
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scalecolor(sl[0], sf); |
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} |
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matscan(sl, len, mat) /* apply color matrix to scaline */ |
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register COLOR *sl; |
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int len; |
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COLORMAT mat; |
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static double |
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greypoint( /* compute gamut mapping grey target */ |
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COLOR col |
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) |
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{ |
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COLOR gryc; |
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int i; |
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/* improves saturated color rendering */ |
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copycolor(gryc, col); |
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for (i = 3; i--; ) |
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if (gryc[i] > cwhite[i]) |
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gryc[i] = cwhite[i]; |
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else if (gryc[i] < cblack[i]) |
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gryc[i] = cblack[i]; |
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return((*lumf)(gryc,0)); |
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} |
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static void |
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matscan( /* apply color matrix to scaline */ |
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register COLOR *sl, |
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int len, |
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COLORMAT mat |
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) |
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{ |
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double gryv; |
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while (len--) { |
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gryv = greypoint(sl[0]); |
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colortrans(sl[0], mat, sl[0]); |
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clipgamut(sl[0], bright(sl[0]), CGAMUT, cblack, cwhite); |
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clipgamut(sl[0], gryv, CGAMUT, cblack, cwhite); |
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sl++; |
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} |
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} |
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mbscan(sl, len, mb) /* apply macbethcal adj. to scaline */ |
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COLOR *sl; |
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int len; |
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register struct mbc *mb; |
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static void |
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mbscan( /* apply macbethcal adj. to scaline */ |
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COLOR *sl, |
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int len, |
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register struct mbc *mb |
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) |
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{ |
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double d; |
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register int i, j; |
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while (len--) { |
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d = greypoint(sl[0]); |
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colortrans(sl[0], mb->cmat, sl[0]); |
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clipgamut(sl[0], bright(sl[0]), CGAMUT, mb->cmin, mb->cmax); |
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clipgamut(sl[0], d, CGAMUT, mb->cmin, mb->cmax); |
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for (i = 0; i < 3; i++) { |
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d = colval(sl[0],i); |
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for (j = 0; j < 4 && mb->xa[i][j+1] <= d; j++) |
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} |
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cwscan(sl, len, wp) /* apply color space warp to scaline */ |
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COLOR *sl; |
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int len; |
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WARP3D *wp; |
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static void |
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cwscan( /* apply color space warp to scaline */ |
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COLOR *sl, |
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int len, |
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WARP3D *wp |
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) |
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{ |
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int rval; |
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double gryv; |
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while (len--) { |
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gryv = greypoint(sl[0]); |
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rval = warp3d(sl[0], sl[0], wp); |
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if (rval & W3ERROR) |
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syserror("warp3d"); |
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progname, cwarpfile); |
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exit(1); |
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} |
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clipgamut(sl[0], bright(sl[0]), CGAMUT, cblack, cwhite); |
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clipgamut(sl[0], gryv, CGAMUT, cblack, cwhite); |
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sl++; |
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} |
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} |
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getmbcalfile(fn, mb) /* load macbethcal file */ |
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char *fn; |
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register struct mbc *mb; |
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static void |
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getmbcalfile( /* load macbethcal file */ |
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char *fn, |
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register struct mbc *mb |
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) |
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{ |
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extern char *fgets(); |
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char buf[128]; |
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FILE *fp; |
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int inpflags = 0; |
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inpflags |= 040; |
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else if (!(inpflags & 0100) && |
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sscanf(buf, |
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"r = %f*r1 + %f*g1 + %f*b1", |
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"ro = %f*rn + %f*gn + %f*bn", |
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&mb->cmat[0][0], &mb->cmat[0][1], |
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&mb->cmat[0][2]) == 3) |
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inpflags |= 0100; |
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else if (!(inpflags & 0200) && |
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sscanf(buf, |
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"g = %f*r1 + %f*g1 + %f*b1", |
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"go = %f*rn + %f*gn + %f*bn", |
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&mb->cmat[1][0], &mb->cmat[1][1], |
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&mb->cmat[1][2]) == 3) |
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inpflags |= 0200; |
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else if (!(inpflags & 0400) && |
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sscanf(buf, |
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"b = %f*r1 + %f*g1 + %f*b1", |
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"bo = %f*rn + %f*gn + %f*bn", |
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&mb->cmat[2][0], &mb->cmat[2][1], |
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&mb->cmat[2][2]) == 3) |
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inpflags |= 0400; |