#ifndef lint
static const char RCSid[] = "$Id: tmapluv.c,v 3.4 2003/02/22 02:07:22 greg Exp $";
#endif
/*
* Routines for tone-mapping LogLuv encoded pixels.
*
* Externals declared in tmaptiff.h
*/
/* ====================================================================
* The Radiance Software License, Version 1.0
*
* Copyright (c) 1990 - 2002 The Regents of the University of California,
* through Lawrence Berkeley National Laboratory. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes Radiance software
* (http://radsite.lbl.gov/)
* developed by the Lawrence Berkeley National Laboratory
* (http://www.lbl.gov/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
* and "The Regents of the University of California" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact radiance@radsite.lbl.gov.
*
* 5. Products derived from this software may not be called "Radiance",
* nor may "Radiance" appear in their name, without prior written
* permission of Lawrence Berkeley National Laboratory.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of Lawrence Berkeley National Laboratory. For more
* information on Lawrence Berkeley National Laboratory, please see
* .
*/
#define LOGLUV_PUBLIC 1
#include
#include
#include
#include "tiffio.h"
#include "tmprivat.h"
#include "tmaptiff.h"
#ifndef BSD
#define bzero(d,n) (void)memset(d,0,n)
#endif
#define uvflgop(p,uv,op) ((p)->rgbflg[(uv)>>5] op (1L<<((uv)&0x1f)))
#define isuvset(p,uv) uvflgop(p,uv,&)
#define setuv(p,uv) uvflgop(p,uv,|=)
#define clruv(p,uv) uvflgop(p,uv,&=~)
#define clruvall(p) bzero((MEM_PTR)(p)->rgbflg,sizeof((p)->rgbflg))
#ifdef NOPROTO
static MEM_PTR luv32Init();
static void luv32NewSpace();
static MEM_PTR luv24Init();
static void luv24NewSpace();
#else
static MEM_PTR luv32Init(struct tmStruct *);
static void luv32NewSpace(struct tmStruct *);
static MEM_PTR luv24Init(struct tmStruct *);
static void luv24NewSpace(struct tmStruct *);
#endif
typedef struct {
int offset; /* computed luminance offset */
BYTE rgbval[1<<16][3]; /* computed RGB value for given uv */
uint32 rgbflg[1<<(16-5)]; /* flags for computed values */
} LUV32DATA; /* LogLuv 32-bit conversion data */
#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \
| (int)(UVSCALE*V_NEU))
static struct tmPackage luv32Pkg = { /* 32-bit package functions */
luv32Init, luv32NewSpace, free
};
static int luv32Reg = -1; /* 32-bit package reg. number */
typedef struct {
int offset; /* computed luminance offset */
BYTE rgbval[1<<14][3]; /* computed rgb value for uv index */
uint32 rgbflg[1<<(14-5)]; /* flags for computed values */
} LUV24DATA; /* LogLuv 24-bit conversion data */
static struct tmPackage luv24Pkg = { /* 24-bit package functions */
luv24Init, luv24NewSpace, free
};
static int luv24Reg = -1; /* 24-bit package reg. number */
static int uv14neu = -1; /* neutral index for 14-bit (u',v') */
static void
uv2rgb(rgb, tm, uvp) /* compute RGB from uv coordinate */
BYTE rgb[3];
register struct tmStruct *tm;
double uvp[2];
{ /* Should check that tm->inppri==TM_XYZPRIM beforehand... */
double d, x, y;
COLOR XYZ, RGB;
/* convert to XYZ */
d = 1./(6.*uvp[0] - 16.*uvp[1] + 12.);
x = 9.*uvp[0] * d;
y = 4.*uvp[1] * d;
XYZ[CIEY] = 1./tm->inpsf;
XYZ[CIEX] = x/y * XYZ[CIEY];
XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
/* convert to RGB and clip */
colortrans(RGB, tm->cmat, XYZ);
clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
/* perform final scaling & gamma */
d = tm->clf[RED] * RGB[RED];
rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
d = tm->clf[GRN] * RGB[GRN];
rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
d = tm->clf[BLU] * RGB[BLU];
rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
}
static TMbright
compmeshift(li, uvp) /* compute mesopic color shift */
TMbright li; /* encoded world luminance */
double uvp[2]; /* world (u',v') -> returned desaturated */
{
double scotrat;
register double d;
if (li >= BMESUPPER)
return(li);
scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343;
if (li <= BMESLOWER) {
d = 0.;
uvp[0] = U_NEU; uvp[1] = V_NEU;
} else {
d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.);
uvp[0] = d*uvp[0] + (1.-d)*U_NEU;
uvp[1] = d*uvp[1] + (1.-d)*V_NEU;
}
/*
d = li + (double)TM_BRTSCALE*log(d + (1.-d)*scotrat);
*/
d = d + (1.-d)*scotrat;
d -= 1.; /* Taylor expansion of log(x) about 1 */
d = d*(1. + d*(-.5 + d*(1./3. + d*-.125)));
d = li + (double)TM_BRTSCALE*d;
return((TMbright)(d>0. ? d+.5 : d-.5));
}
int
tmCvLuv32(ls, cs, luvs, len) /* convert raw 32-bit LogLuv values */
TMbright *ls;
BYTE *cs;
uint32 *luvs;
int len;
{
static char funcName[] = "tmCvLuv32";
double uvp[2];
register LUV32DATA *ld;
register int i, j;
/* check arguments */
if (tmTop == NULL)
returnErr(TM_E_TMINVAL);
if (ls == NULL | luvs == NULL | len < 0)
returnErr(TM_E_ILLEGAL);
/* check package registration */
if (luv32Reg < 0) {
if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
returnErr(TM_E_CODERR1);
tmMkMesofact();
}
/* get package data */
if ((ld = (LUV32DATA *)tmPkgData(tmTop,luv32Reg)) == NULL)
returnErr(TM_E_NOMEM);
/* convert each pixel */
for (i = len; i--; ) {
j = luvs[i] >> 16; /* get luminance */
if (j & 0x8000) /* negative luminance */
ls[i] = TM_NOBRT; /* assign bogus value */
else /* else convert to lnL */
ls[i] = (BRT2SCALE(j) >> 8) - ld->offset;
if (cs == TM_NOCHROM) /* no color? */
continue;
/* get chrominance */
if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
ls[i] = compmeshift(ls[i], uvp);
j = tmTop->flags&TM_F_BW || ls[i]flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
}
if (!isuvset(ld, j)) {
uvp[0] = 1./UVSCALE*((j>>8) + .5);
uvp[1] = 1./UVSCALE*((j & 0xff) + .5);
uv2rgb(ld->rgbval[j], tmTop, uvp);
setuv(ld, j);
}
cs[3*i ] = ld->rgbval[j][RED];
cs[3*i+1] = ld->rgbval[j][GRN];
cs[3*i+2] = ld->rgbval[j][BLU];
}
returnOK;
}
int
tmCvLuv24(ls, cs, luvs, len) /* convert raw 24-bit LogLuv values */
TMbright *ls;
BYTE *cs;
uint32 *luvs;
int len;
{
char funcName[] = "tmCvLuv24";
double uvp[2];
register LUV24DATA *ld;
register int i, j;
/* check arguments */
if (tmTop == NULL)
returnErr(TM_E_TMINVAL);
if (ls == NULL | luvs == NULL | len < 0)
returnErr(TM_E_ILLEGAL);
/* check package registration */
if (luv24Reg < 0) {
if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
returnErr(TM_E_CODERR1);
tmMkMesofact();
}
/* get package data */
if ((ld = (LUV24DATA *)tmPkgData(tmTop,luv24Reg)) == NULL)
returnErr(TM_E_NOMEM);
/* convert each pixel */
for (i = len; i--; ) {
j = luvs[i] >> 14; /* get luminance */
ls[i] = (BRT2SCALE(j) >> 6) - ld->offset;
if (cs == TM_NOCHROM) /* no color? */
continue;
/* get chrominance */
if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
if (uv_decode(uvp, uvp+1, luvs[i]&0x3fff) < 0) {
uvp[0] = U_NEU; /* should barf? */
uvp[1] = V_NEU;
}
ls[i] = compmeshift(ls[i], uvp);
if (tmTop->flags&TM_F_BW || ls[i]flags&TM_F_BW ? uv14neu : luvs[i]&0x3fff;
}
if (!isuvset(ld, j)) {
if (uv_decode(&uvp[0], &uvp[1], j) < 0) {
uvp[0] = U_NEU; uvp[1] = V_NEU;
}
uv2rgb(ld->rgbval[j], tmTop, uvp);
setuv(ld, j);
}
cs[3*i ] = ld->rgbval[j][RED];
cs[3*i+1] = ld->rgbval[j][GRN];
cs[3*i+2] = ld->rgbval[j][BLU];
}
returnOK;
}
int
tmCvL16(ls, l16s, len) /* convert 16-bit LogL values */
TMbright *ls;
uint16 *l16s;
int len;
{
static char funcName[] = "tmCvL16";
static double lastsf;
static int offset;
register int i;
/* check arguments */
if (tmTop == NULL)
returnErr(TM_E_TMINVAL);
if (ls == NULL | l16s == NULL | len < 0)
returnErr(TM_E_ILLEGAL);
/* check scaling offset */
if (!FEQ(tmTop->inpsf, lastsf)) {
offset = BRT2SCALE(64);
if (tmTop->inpsf > 1.0001)
offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
else if (tmTop->inpsf < 0.9999)
offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
lastsf = tmTop->inpsf;
}
/* convert each pixel */
for (i = len; i--; ) {
if (l16s[i] & 0x8000) /* negative luminance */
ls[i] = TM_NOBRT; /* assign bogus value */
else /* else convert to lnL */
ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset;
}
returnOK;
}
static void
luv32NewSpace(tm) /* initialize 32-bit LogLuv color space */
struct tmStruct *tm;
{
register LUV32DATA *ld;
if (tm->inppri != TM_XYZPRIM) { /* panic time! */
fputs("Improper input color space in luv32NewSpace!\n", stderr);
exit(1);
}
ld = (LUV32DATA *)tm->pd[luv32Reg];
ld->offset = BRT2SCALE(64);
if (tm->inpsf > 1.0001)
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
else if (tm->inpsf < 0.9999)
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
clruvall(ld);
}
static MEM_PTR
luv32Init(tm) /* allocate data for 32-bit LogLuv decoder */
struct tmStruct *tm;
{
register LUV32DATA *ld;
ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
if (ld == NULL)
return(NULL);
tm->pd[luv32Reg] = (MEM_PTR)ld;
luv32NewSpace(tm);
return((MEM_PTR)ld);
}
static void
luv24NewSpace(tm) /* initialize 24-bit LogLuv color space */
struct tmStruct *tm;
{
register LUV24DATA *ld;
if (tm->inppri != TM_XYZPRIM) { /* panic time! */
fputs("Improper input color space in luv24NewSpace!\n", stderr);
exit(1);
}
ld = (LUV24DATA *)tm->pd[luv24Reg];
ld->offset = BRT2SCALE(12);
if (tm->inpsf > 1.0001)
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
else if (tm->inpsf < 0.9999)
ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
clruvall(ld);
}
static MEM_PTR
luv24Init(tm) /* allocate data for 24-bit LogLuv decoder */
struct tmStruct *tm;
{
register LUV24DATA *ld;
ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
if (ld == NULL)
return(NULL);
tm->pd[luv24Reg] = (MEM_PTR)ld;
if (uv14neu < 0) /* initialize neutral color index */
uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
luv24NewSpace(tm);
return((MEM_PTR)ld);
}