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#ifndef lint
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static const char RCSid[] = "$Id: tmapluv.c,v 3.16 2011/05/20 02:06:38 greg Exp $";
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#endif
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/*
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* Routines for tone-mapping LogLuv encoded pixels.
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*
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* Externals declared in tmaptiff.h
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*/
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#include "copyright.h"
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#define LOGLUV_PUBLIC 1
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "tiffio.h"
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#include "tmprivat.h"
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#include "tmaptiff.h"
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#define uvflgop(p,uv,op) ((p)->rgbflg[(uv)>>5] op (1L<<((uv)&0x1f)))
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#define isuvset(p,uv) uvflgop(p,uv,&)
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#define setuv(p,uv) uvflgop(p,uv,|=)
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#define clruv(p,uv) uvflgop(p,uv,&=~)
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#define clruvall(p) memset((p)->rgbflg,'\0',sizeof((p)->rgbflg))
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#ifdef NOPROTO
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static void * luv32Init();
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static void luv32NewSpace();
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static void * luv24Init();
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static void luv24NewSpace();
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#else
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static void * luv32Init(TMstruct *);
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static void luv32NewSpace(TMstruct *);
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static void * luv24Init(TMstruct *);
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static void luv24NewSpace(TMstruct *);
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#endif
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typedef struct {
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int offset; /* computed luminance offset */
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uby8 rgbval[1<<16][3]; /* computed RGB value for given uv */
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uint32 rgbflg[1<<(16-5)]; /* flags for computed values */
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} LUV32DATA; /* LogLuv 32-bit conversion data */
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#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \
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| (int)(UVSCALE*V_NEU))
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static struct tmPackage luv32Pkg = { /* 32-bit package functions */
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luv32Init, luv32NewSpace, free
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};
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static int luv32Reg = -1; /* 32-bit package reg. number */
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typedef struct {
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int offset; /* computed luminance offset */
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uby8 rgbval[1<<14][3]; /* computed rgb value for uv index */
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uint32 rgbflg[1<<(14-5)]; /* flags for computed values */
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} LUV24DATA; /* LogLuv 24-bit conversion data */
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static struct tmPackage luv24Pkg = { /* 24-bit package functions */
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luv24Init, luv24NewSpace, free
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};
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static int luv24Reg = -1; /* 24-bit package reg. number */
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static int uv14neu = -1; /* neutral index for 14-bit (u',v') */
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static void
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uv2rgb(rgb, tms, uvp) /* compute RGB from uv coordinate */
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uby8 rgb[3];
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TMstruct *tms;
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double uvp[2];
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{ /* Should check that tms->inppri==TM_XYZPRIM beforehand... */
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double d, x, y;
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COLOR XYZ, RGB;
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/* convert to XYZ */
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d = 1./(6.*uvp[0] - 16.*uvp[1] + 12.);
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x = 9.*uvp[0] * d;
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y = 4.*uvp[1] * d;
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XYZ[CIEY] = 1./tms->inpsf;
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XYZ[CIEX] = x/y * XYZ[CIEY];
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XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
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/* convert to RGB and clip */
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colortrans(RGB, tms->cmat, XYZ);
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clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
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/* perform final scaling & gamma */
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d = tms->clf[RED] * RGB[RED];
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rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
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d = tms->clf[GRN] * RGB[GRN];
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rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
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d = tms->clf[BLU] * RGB[BLU];
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rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
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}
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static TMbright
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compmeshift(li, uvp) /* compute mesopic color shift */
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TMbright li; /* encoded world luminance */
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double uvp[2]; /* world (u',v') -> returned desaturated */
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{
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double scotrat;
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double d;
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if (li >= BMESUPPER)
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return(li);
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scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343;
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if (li <= BMESLOWER) {
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d = 0.;
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uvp[0] = U_NEU; uvp[1] = V_NEU;
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} else {
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d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.);
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uvp[0] = d*uvp[0] + (1.-d)*U_NEU;
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uvp[1] = d*uvp[1] + (1.-d)*V_NEU;
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}
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/*
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d = li + (double)TM_BRTSCALE*log(d + (1.-d)*scotrat);
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*/
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d = d + (1.-d)*scotrat;
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d -= 1.; /* Taylor expansion of log(x) about 1 */
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d = d*(1. + d*(-.5 + d*(1./3. + d*-.125)));
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d = li + (double)TM_BRTSCALE*d;
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return((TMbright)(d>0. ? d+.5 : d-.5));
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}
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int
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tmCvLuv32( /* convert raw 32-bit LogLuv values */
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TMstruct *tms,
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TMbright *ls,
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uby8 *cs,
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uint32 *luvs,
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int len
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)
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{
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static const char funcName[] = "tmCvLuv32";
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double uvp[2];
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LUV32DATA *ld;
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int i, j;
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/* check arguments */
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if (tms == NULL)
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returnErr(TM_E_TMINVAL);
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if ((ls == NULL) | (luvs == NULL) | (len < 0))
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returnErr(TM_E_ILLEGAL);
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/* check package registration */
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if (luv32Reg < 0) {
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if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
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returnErr(TM_E_CODERR1);
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tmMkMesofact();
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}
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/* get package data */
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if ((ld = (LUV32DATA *)tmPkgData(tms,luv32Reg)) == NULL)
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returnErr(TM_E_NOMEM);
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/* convert each pixel */
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for (i = len; i--; ) {
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j = luvs[i] >> 16; /* get luminance */
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if (j & 0x8000) /* negative luminance */
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ls[i] = TM_NOBRT; /* assign bogus value */
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else /* else convert to lnL */
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ls[i] = (BRT2SCALE(j) >> 8) - ld->offset;
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if (cs == TM_NOCHROM) /* no color? */
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continue;
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/* get chrominance */
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if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
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uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
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uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
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ls[i] = compmeshift(ls[i], uvp);
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j = tms->flags&TM_F_BW || ls[i]<BMESLOWER
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? UVNEU
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: (int)(uvp[0]*UVSCALE)<<8
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| (int)(uvp[1]*UVSCALE);
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} else {
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j = tms->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
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}
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if (!isuvset(ld, j)) {
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uvp[0] = 1./UVSCALE*((j>>8) + .5);
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uvp[1] = 1./UVSCALE*((j & 0xff) + .5);
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uv2rgb(ld->rgbval[j], tms, uvp);
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setuv(ld, j);
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}
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cs[3*i ] = ld->rgbval[j][RED];
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cs[3*i+1] = ld->rgbval[j][GRN];
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cs[3*i+2] = ld->rgbval[j][BLU];
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}
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returnOK;
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}
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int
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tmCvLuv24( /* convert raw 24-bit LogLuv values */
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TMstruct *tms,
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TMbright *ls,
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uby8 *cs,
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uint32 *luvs,
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int len
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)
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{
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char funcName[] = "tmCvLuv24";
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double uvp[2];
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LUV24DATA *ld;
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int i, j;
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/* check arguments */
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if (tms == NULL)
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returnErr(TM_E_TMINVAL);
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if ((ls == NULL) | (luvs == NULL) | (len < 0))
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returnErr(TM_E_ILLEGAL);
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/* check package registration */
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if (luv24Reg < 0) {
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if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
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returnErr(TM_E_CODERR1);
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tmMkMesofact();
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}
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/* get package data */
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if ((ld = (LUV24DATA *)tmPkgData(tms,luv24Reg)) == NULL)
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returnErr(TM_E_NOMEM);
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/* convert each pixel */
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for (i = len; i--; ) {
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j = luvs[i] >> 14; /* get luminance */
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ls[i] = (BRT2SCALE(j) >> 6) - ld->offset;
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if (cs == TM_NOCHROM) /* no color? */
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continue;
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/* get chrominance */
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if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
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if (uv_decode(&uvp[0], &uvp[1], luvs[i]&0x3fff) < 0) {
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uvp[0] = U_NEU; /* should barf? */
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uvp[1] = V_NEU;
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}
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ls[i] = compmeshift(ls[i], uvp);
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if (tms->flags&TM_F_BW || ls[i]<BMESLOWER
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|| (j = uv_encode(uvp[0], uvp[1],
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SGILOGENCODE_NODITHER)) < 0)
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j = uv14neu;
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} else {
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j = tms->flags&TM_F_BW ? uv14neu :
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(int)(luvs[i]&0x3fff);
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}
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if (!isuvset(ld, j)) {
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if (uv_decode(&uvp[0], &uvp[1], j) < 0) {
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uvp[0] = U_NEU; uvp[1] = V_NEU;
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}
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uv2rgb(ld->rgbval[j], tms, uvp);
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setuv(ld, j);
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}
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cs[3*i ] = ld->rgbval[j][RED];
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cs[3*i+1] = ld->rgbval[j][GRN];
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cs[3*i+2] = ld->rgbval[j][BLU];
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}
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returnOK;
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}
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int
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tmCvL16( /* convert 16-bit LogL values */
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TMstruct *tms,
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TMbright *ls,
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uint16 *l16s,
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int len
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)
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{
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static const char funcName[] = "tmCvL16";
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static double lastsf;
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static int offset;
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int i;
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/* check arguments */
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if (tms == NULL)
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returnErr(TM_E_TMINVAL);
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if ((ls == NULL) | (l16s == NULL) | (len < 0))
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returnErr(TM_E_ILLEGAL);
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/* check scaling offset */
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if (!FEQ(tms->inpsf, lastsf)) {
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offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
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lastsf = tms->inpsf;
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}
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/* convert each pixel */
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for (i = len; i--; ) {
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if (l16s[i] & 0x8000) /* negative luminance */
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ls[i] = TM_NOBRT; /* assign bogus value */
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else /* else convert to lnL */
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ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset;
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}
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returnOK;
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}
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static void
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luv32NewSpace(tms) /* initialize 32-bit LogLuv color space */
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TMstruct *tms;
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{
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LUV32DATA *ld;
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if (tms->inppri != TM_XYZPRIM) { /* panic time! */
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fputs("Improper input color space in luv32NewSpace!\n", stderr);
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exit(1);
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}
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ld = (LUV32DATA *)tms->pd[luv32Reg];
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ld->offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
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clruvall(ld);
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}
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static void *
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luv32Init(tms) /* allocate data for 32-bit LogLuv decoder */
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TMstruct *tms;
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{
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LUV32DATA *ld;
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ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
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if (ld == NULL)
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return(NULL);
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tms->pd[luv32Reg] = (void *)ld;
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luv32NewSpace(tms);
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return((void *)ld);
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}
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static void
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luv24NewSpace(tms) /* initialize 24-bit LogLuv color space */
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TMstruct *tms;
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{
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LUV24DATA *ld;
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if (tms->inppri != TM_XYZPRIM) { /* panic time! */
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fputs("Improper input color space in luv24NewSpace!\n", stderr);
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exit(1);
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}
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ld = (LUV24DATA *)tms->pd[luv24Reg];
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ld->offset = BRT2SCALE(12) - tmCvLuminance(tms->inpsf);
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clruvall(ld);
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}
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static void *
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luv24Init(tms) /* allocate data for 24-bit LogLuv decoder */
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TMstruct *tms;
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{
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LUV24DATA *ld;
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ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
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if (ld == NULL)
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return(NULL);
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tms->pd[luv24Reg] = (void *)ld;
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if (uv14neu < 0) /* initialize neutral color index */
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uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
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luv24NewSpace(tms);
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return((void *)ld);
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}
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