src/common/tmapluv.c

#ifndef lint
static const char       RCSid[] = "$Id: tmapluv.c,v 3.6 2003/06/30 14:59:11 schorsch Exp $";
#endif
/*
 * Routines for tone-mapping LogLuv encoded pixels.
 *
 * Externals declared in tmaptiff.h
 */

#include "copyright.h"

#define LOGLUV_PUBLIC           1

#include <stdio.h>
#include <string.h>
#include <math.h>
#include "tiffio.h"
#include "tmprivat.h"
#include "tmaptiff.h"

#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)             memset((MEM_PTR)(p)->rgbflg,'\0',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]<BMESLOWER
                                        ? UVNEU
                                        : (int)(uvp[0]*UVSCALE)<<8
                                                | (int)(uvp[1]*UVSCALE);
                } else {
                        j = tmTop->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]<BMESLOWER
                                        || (j = uv_encode(uvp[0], uvp[1],
                                                SGILOGENCODE_NODITHER)) < 0)
                                j = uv14neu;
                } else {
                        j = tmTop->flags&TM_F_BW ? uv14neu :
                                        (int)(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);
}
Revision:	3.7
Committed:	Tue Jul 1 16:20:04 2003 UTC (20 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 3.6:	+3 -2 lines
Log Message:	Compile fixes related to Photosphere
#	User	Rev	Content
1	gwlarson	3.1	#ifndef lint
2	greg	3.7	static const char RCSid[] = "$Id: tmapluv.c,v 3.6 2003/06/30 14:59:11 schorsch Exp $";
3	gwlarson	3.1	#endif
4			/*
5			* Routines for tone-mapping LogLuv encoded pixels.
6	greg	3.4	*
7			* Externals declared in tmaptiff.h
8			*/
9
10	greg	3.5	#include "copyright.h"
11	gwlarson	3.1
12	greg	3.4	#define LOGLUV_PUBLIC 1
13
14	gwlarson	3.1	#include <stdio.h>
15	greg	3.4	#include <string.h>
16	gwlarson	3.1	#include <math.h>
17			#include "tiffio.h"
18			#include "tmprivat.h"
19	greg	3.4	#include "tmaptiff.h"
20	gwlarson	3.1
21			#define uvflgop(p,uv,op) ((p)->rgbflg[(uv)>>5] op (1L<<((uv)&0x1f)))
22			#define isuvset(p,uv) uvflgop(p,uv,&)
23			#define setuv(p,uv) uvflgop(p,uv,\|=)
24			#define clruv(p,uv) uvflgop(p,uv,&=~)
25	schorsch	3.6	#define clruvall(p) memset((MEM_PTR)(p)->rgbflg,'\0',sizeof((p)->rgbflg))
26	gwlarson	3.1
27	greg	3.4	#ifdef NOPROTO
28	gwlarson	3.1	static MEM_PTR luv32Init();
29			static void luv32NewSpace();
30			static MEM_PTR luv24Init();
31			static void luv24NewSpace();
32	greg	3.4	#else
33			static MEM_PTR luv32Init(struct tmStruct *);
34			static void luv32NewSpace(struct tmStruct *);
35			static MEM_PTR luv24Init(struct tmStruct *);
36			static void luv24NewSpace(struct tmStruct *);
37			#endif
38	gwlarson	3.1
39			typedef struct {
40			int offset; /* computed luminance offset */
41			BYTE rgbval[1<<16][3]; /* computed RGB value for given uv */
42			uint32 rgbflg[1<<(16-5)]; /* flags for computed values */
43			} LUV32DATA; /* LogLuv 32-bit conversion data */
44
45			#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \
46			\| (int)(UVSCALE*V_NEU))
47
48			static struct tmPackage luv32Pkg = { /* 32-bit package functions */
49			luv32Init, luv32NewSpace, free
50			};
51			static int luv32Reg = -1; /* 32-bit package reg. number */
52
53			typedef struct {
54			int offset; /* computed luminance offset */
55			BYTE rgbval[1<<14][3]; /* computed rgb value for uv index */
56			uint32 rgbflg[1<<(14-5)]; /* flags for computed values */
57			} LUV24DATA; /* LogLuv 24-bit conversion data */
58
59			static struct tmPackage luv24Pkg = { /* 24-bit package functions */
60			luv24Init, luv24NewSpace, free
61			};
62			static int luv24Reg = -1; /* 24-bit package reg. number */
63
64			static int uv14neu = -1; /* neutral index for 14-bit (u',v') */
65
66
67	greg	3.4	static void
68	gwlarson	3.1	uv2rgb(rgb, tm, uvp) /* compute RGB from uv coordinate */
69			BYTE rgb[3];
70			register struct tmStruct *tm;
71			double uvp[2];
72			{ /* Should check that tm->inppri==TM_XYZPRIM beforehand... */
73			double d, x, y;
74	gwlarson	3.2	COLOR XYZ, RGB;
75	gwlarson	3.1	/* convert to XYZ */
76			d = 1./(6.uvp[0] - 16.uvp[1] + 12.);
77			x = 9.uvp[0] d;
78			y = 4.uvp[1] d;
79			XYZ[CIEY] = 1./tm->inpsf;
80			XYZ[CIEX] = x/y * XYZ[CIEY];
81			XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
82			/* convert to RGB and clip */
83			colortrans(RGB, tm->cmat, XYZ);
84	greg	3.4	clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
85	gwlarson	3.1	/* perform final scaling & gamma */
86			d = tm->clf[RED] * RGB[RED];
87			rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
88			d = tm->clf[GRN] * RGB[GRN];
89			rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
90			d = tm->clf[BLU] * RGB[BLU];
91			rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tm->mongam));
92			}
93
94
95			static TMbright
96			compmeshift(li, uvp) /* compute mesopic color shift */
97			TMbright li; /* encoded world luminance */
98			double uvp[2]; /* world (u',v') -> returned desaturated */
99			{
100	greg	3.4	double scotrat;
101			register double d;
102	gwlarson	3.2
103			if (li >= BMESUPPER)
104			return(li);
105	greg	3.4	scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343;
106	gwlarson	3.2	if (li <= BMESLOWER) {
107			d = 0.;
108			uvp[0] = U_NEU; uvp[1] = V_NEU;
109			} else {
110	greg	3.4	d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.);
111	gwlarson	3.2	uvp[0] = duvp[0] + (1.-d)U_NEU;
112			uvp[1] = duvp[1] + (1.-d)V_NEU;
113			}
114	greg	3.4	/*
115			d = li + (double)TM_BRTSCALElog(d + (1.-d)scotrat);
116			*/
117			d = d + (1.-d)*scotrat;
118			d -= 1.; /* Taylor expansion of log(x) about 1 */
119			d = d(1. + d(-.5 + d(1./3. + d-.125)));
120			d = li + (double)TM_BRTSCALE*d;
121			return((TMbright)(d>0. ? d+.5 : d-.5));
122	gwlarson	3.1	}
123
124
125			int
126			tmCvLuv32(ls, cs, luvs, len) /* convert raw 32-bit LogLuv values */
127			TMbright *ls;
128			BYTE *cs;
129			uint32 *luvs;
130			int len;
131			{
132			static char funcName[] = "tmCvLuv32";
133			double uvp[2];
134			register LUV32DATA *ld;
135			register int i, j;
136			/* check arguments */
137			if (tmTop == NULL)
138			returnErr(TM_E_TMINVAL);
139			if (ls == NULL \| luvs == NULL \| len < 0)
140			returnErr(TM_E_ILLEGAL);
141			/* check package registration */
142	greg	3.4	if (luv32Reg < 0) {
143			if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
144			returnErr(TM_E_CODERR1);
145			tmMkMesofact();
146			}
147	gwlarson	3.1	/* get package data */
148			if ((ld = (LUV32DATA *)tmPkgData(tmTop,luv32Reg)) == NULL)
149			returnErr(TM_E_NOMEM);
150			/* convert each pixel */
151			for (i = len; i--; ) {
152			j = luvs[i] >> 16; /* get luminance */
153			if (j & 0x8000) /* negative luminance */
154	gwlarson	3.3	ls[i] = TM_NOBRT; /* assign bogus value */
155	gwlarson	3.1	else /* else convert to lnL */
156	greg	3.4	ls[i] = (BRT2SCALE(j) >> 8) - ld->offset;
157	gwlarson	3.1	if (cs == TM_NOCHROM) /* no color? */
158			continue;
159			/* get chrominance */
160			if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
161			uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
162			uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
163			ls[i] = compmeshift(ls[i], uvp);
164	gwlarson	3.2	j = tmTop->flags&TM_F_BW \|\| ls[i]<BMESLOWER
165	gwlarson	3.1	? UVNEU
166			: (int)(uvp[0]*UVSCALE)<<8
167			\| (int)(uvp[1]*UVSCALE);
168			} else {
169			j = tmTop->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
170			}
171			if (!isuvset(ld, j)) {
172	greg	3.4	uvp[0] = 1./UVSCALE*((j>>8) + .5);
173			uvp[1] = 1./UVSCALE*((j & 0xff) + .5);
174	gwlarson	3.1	uv2rgb(ld->rgbval[j], tmTop, uvp);
175			setuv(ld, j);
176			}
177			cs[3*i ] = ld->rgbval[j][RED];
178			cs[3*i+1] = ld->rgbval[j][GRN];
179			cs[3*i+2] = ld->rgbval[j][BLU];
180			}
181			returnOK;
182			}
183
184
185			int
186			tmCvLuv24(ls, cs, luvs, len) /* convert raw 24-bit LogLuv values */
187			TMbright *ls;
188			BYTE *cs;
189			uint32 *luvs;
190			int len;
191			{
192			char funcName[] = "tmCvLuv24";
193			double uvp[2];
194			register LUV24DATA *ld;
195			register int i, j;
196			/* check arguments */
197			if (tmTop == NULL)
198			returnErr(TM_E_TMINVAL);
199			if (ls == NULL \| luvs == NULL \| len < 0)
200			returnErr(TM_E_ILLEGAL);
201			/* check package registration */
202	greg	3.4	if (luv24Reg < 0) {
203			if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
204			returnErr(TM_E_CODERR1);
205			tmMkMesofact();
206			}
207	gwlarson	3.1	/* get package data */
208			if ((ld = (LUV24DATA *)tmPkgData(tmTop,luv24Reg)) == NULL)
209			returnErr(TM_E_NOMEM);
210			/* convert each pixel */
211			for (i = len; i--; ) {
212			j = luvs[i] >> 14; /* get luminance */
213	greg	3.4	ls[i] = (BRT2SCALE(j) >> 6) - ld->offset;
214	gwlarson	3.1	if (cs == TM_NOCHROM) /* no color? */
215			continue;
216			/* get chrominance */
217			if (tmTop->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
218	greg	3.4	if (uv_decode(uvp, uvp+1, luvs[i]&0x3fff) < 0) {
219	gwlarson	3.1	uvp[0] = U_NEU; /* should barf? */
220			uvp[1] = V_NEU;
221			}
222			ls[i] = compmeshift(ls[i], uvp);
223	gwlarson	3.2	if (tmTop->flags&TM_F_BW \|\| ls[i]<BMESLOWER
224	greg	3.4	\|\| (j = uv_encode(uvp[0], uvp[1],
225			SGILOGENCODE_NODITHER)) < 0)
226	gwlarson	3.1	j = uv14neu;
227			} else {
228	greg	3.7	j = tmTop->flags&TM_F_BW ? uv14neu :
229			(int)(luvs[i]&0x3fff);
230	gwlarson	3.1	}
231			if (!isuvset(ld, j)) {
232	greg	3.4	if (uv_decode(&uvp[0], &uvp[1], j) < 0) {
233	gwlarson	3.2	uvp[0] = U_NEU; uvp[1] = V_NEU;
234	gwlarson	3.1	}
235			uv2rgb(ld->rgbval[j], tmTop, uvp);
236			setuv(ld, j);
237			}
238			cs[3*i ] = ld->rgbval[j][RED];
239			cs[3*i+1] = ld->rgbval[j][GRN];
240			cs[3*i+2] = ld->rgbval[j][BLU];
241			}
242			returnOK;
243			}
244
245
246			int
247			tmCvL16(ls, l16s, len) /* convert 16-bit LogL values */
248			TMbright *ls;
249			uint16 *l16s;
250			int len;
251			{
252			static char funcName[] = "tmCvL16";
253			static double lastsf;
254			static int offset;
255			register int i;
256			/* check arguments */
257			if (tmTop == NULL)
258			returnErr(TM_E_TMINVAL);
259			if (ls == NULL \| l16s == NULL \| len < 0)
260			returnErr(TM_E_ILLEGAL);
261			/* check scaling offset */
262			if (!FEQ(tmTop->inpsf, lastsf)) {
263	greg	3.4	offset = BRT2SCALE(64);
264	gwlarson	3.1	if (tmTop->inpsf > 1.0001)
265			offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
266			else if (tmTop->inpsf < 0.9999)
267			offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
268			lastsf = tmTop->inpsf;
269			}
270			/* convert each pixel */
271			for (i = len; i--; ) {
272			if (l16s[i] & 0x8000) /* negative luminance */
273	gwlarson	3.3	ls[i] = TM_NOBRT; /* assign bogus value */
274	gwlarson	3.1	else /* else convert to lnL */
275	greg	3.4	ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset;
276	gwlarson	3.1	}
277			returnOK;
278			}
279
280
281			static void
282			luv32NewSpace(tm) /* initialize 32-bit LogLuv color space */
283			struct tmStruct *tm;
284			{
285			register LUV32DATA *ld;
286
287			if (tm->inppri != TM_XYZPRIM) { /* panic time! */
288			fputs("Improper input color space in luv32NewSpace!\n", stderr);
289			exit(1);
290			}
291			ld = (LUV32DATA *)tm->pd[luv32Reg];
292	greg	3.4	ld->offset = BRT2SCALE(64);
293	gwlarson	3.1	if (tm->inpsf > 1.0001)
294			ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
295			else if (tm->inpsf < 0.9999)
296			ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
297			clruvall(ld);
298			}
299
300
301			static MEM_PTR
302			luv32Init(tm) /* allocate data for 32-bit LogLuv decoder */
303			struct tmStruct *tm;
304			{
305			register LUV32DATA *ld;
306
307			ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
308			if (ld == NULL)
309			return(NULL);
310			tm->pd[luv32Reg] = (MEM_PTR)ld;
311			luv32NewSpace(tm);
312			return((MEM_PTR)ld);
313			}
314
315
316			static void
317			luv24NewSpace(tm) /* initialize 24-bit LogLuv color space */
318			struct tmStruct *tm;
319			{
320			register LUV24DATA *ld;
321
322			if (tm->inppri != TM_XYZPRIM) { /* panic time! */
323			fputs("Improper input color space in luv24NewSpace!\n", stderr);
324			exit(1);
325			}
326			ld = (LUV24DATA *)tm->pd[luv24Reg];
327	greg	3.4	ld->offset = BRT2SCALE(12);
328	gwlarson	3.1	if (tm->inpsf > 1.0001)
329			ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)+.5);
330			else if (tm->inpsf < 0.9999)
331			ld->offset -= (int)(TM_BRTSCALE*log(tmTop->inpsf)-.5);
332			clruvall(ld);
333			}
334
335
336			static MEM_PTR
337			luv24Init(tm) /* allocate data for 24-bit LogLuv decoder */
338			struct tmStruct *tm;
339			{
340			register LUV24DATA *ld;
341
342			ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
343			if (ld == NULL)
344			return(NULL);
345			tm->pd[luv24Reg] = (MEM_PTR)ld;
346	greg	3.4	if (uv14neu < 0) /* initialize neutral color index */
347			uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
348	gwlarson	3.1	luv24NewSpace(tm);
349			return((MEM_PTR)ld);
350			}