src/common/tmapluv.c

#ifndef lint
static const char       RCSid[] = "$Id: tmapluv.c,v 3.11 2005/01/07 21:41:06 greg 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(TMstruct *);
static void     luv32NewSpace(TMstruct *);
static MEM_PTR  luv24Init(TMstruct *);
static void     luv24NewSpace(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, tms, uvp)                   /* compute RGB from uv coordinate */
BYTE    rgb[3];
register TMstruct       *tms;
double  uvp[2];
{       /* Should check that tms->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./tms->inpsf;
        XYZ[CIEX] = x/y * XYZ[CIEY];
        XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
                                        /* convert to RGB and clip */
        colortrans(RGB, tms->cmat, XYZ);
        clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
                                        /* perform final scaling & gamma */
        d = tms->clf[RED] * RGB[RED];
        rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
        d = tms->clf[GRN] * RGB[GRN];
        rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
        d = tms->clf[BLU] * RGB[BLU];
        rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->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(                              /* convert raw 32-bit LogLuv values */
TMstruct        *tms,
TMbright        *ls,
BYTE    *cs,
uint32  *luvs,
int     len
)
{
        static const char       funcName[] = "tmCvLuv32";
        double  uvp[2];
        register LUV32DATA      *ld;
        register int    i, j;
                                        /* check arguments */
        if (tms == 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(tms,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 (tms->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 = tms->flags&TM_F_BW || ls[i]<BMESLOWER
                                        ? UVNEU
                                        : (int)(uvp[0]*UVSCALE)<<8
                                                | (int)(uvp[1]*UVSCALE);
                } else {
                        j = tms->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], tms, 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(                      /* convert raw 24-bit LogLuv values */
TMstruct        *tms,
TMbright        *ls,
BYTE    *cs,
uint32  *luvs,
int     len
)
{
        char    funcName[] = "tmCvLuv24";
        double  uvp[2];
        register LUV24DATA      *ld;
        register int    i, j;
                                        /* check arguments */
        if (tms == 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(tms,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 (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
                        if (uv_decode(&uvp[0], &uvp[1], luvs[i]&0x3fff) < 0) {
                                uvp[0] = U_NEU;         /* should barf? */
                                uvp[1] = V_NEU;
                        }
                        ls[i] = compmeshift(ls[i], uvp);
                        if (tms->flags&TM_F_BW || ls[i]<BMESLOWER
                                        || (j = uv_encode(uvp[0], uvp[1],
                                                SGILOGENCODE_NODITHER)) < 0)
                                j = uv14neu;
                } else {
                        j = tms->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], tms, 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(                                /* convert 16-bit LogL values */
TMstruct        *tms,
TMbright        *ls,
uint16  *l16s,
int     len
)
{
        static const char       funcName[] = "tmCvL16";
        static double   lastsf;
        static int      offset;
        register int    i;
                                        /* check arguments */
        if (tms == NULL)
                returnErr(TM_E_TMINVAL);
        if ((ls == NULL) | (l16s == NULL) | (len < 0))
                returnErr(TM_E_ILLEGAL);
                                        /* check scaling offset */
        if (!FEQ(tms->inpsf, lastsf)) {
                offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
                lastsf = tms->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(tms)              /* initialize 32-bit LogLuv color space */
TMstruct        *tms;
{
        register LUV32DATA      *ld;

        if (tms->inppri != TM_XYZPRIM) {                /* panic time! */
                fputs("Improper input color space in luv32NewSpace!\n", stderr);
                exit(1);
        }
        ld = (LUV32DATA *)tms->pd[luv32Reg];
        ld->offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
        clruvall(ld);
}


static MEM_PTR
luv32Init(tms)                  /* allocate data for 32-bit LogLuv decoder */
TMstruct        *tms;
{
        register LUV32DATA      *ld;

        ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
        if (ld == NULL)
                return(NULL);
        tms->pd[luv32Reg] = (MEM_PTR)ld;
        luv32NewSpace(tms);
        return((MEM_PTR)ld);
}


static void
luv24NewSpace(tms)              /* initialize 24-bit LogLuv color space */
TMstruct *tms;
{
        register LUV24DATA      *ld;

        if (tms->inppri != TM_XYZPRIM) {                /* panic time! */
                fputs("Improper input color space in luv24NewSpace!\n", stderr);
                exit(1);
        }
        ld = (LUV24DATA *)tms->pd[luv24Reg];
        ld->offset = BRT2SCALE(12) - tmCvLuminance(tms->inpsf);
        clruvall(ld);
}


static MEM_PTR
luv24Init(tms)                  /* allocate data for 24-bit LogLuv decoder */
TMstruct        *tms;
{
        register LUV24DATA      *ld;

        ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
        if (ld == NULL)
                return(NULL);
        tms->pd[luv24Reg] = (MEM_PTR)ld;
        if (uv14neu < 0)                /* initialize neutral color index */
                uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
        luv24NewSpace(tms);
        return((MEM_PTR)ld);
}
Revision:	3.12
Committed:	Tue Nov 15 06:53:00 2005 UTC (18 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R8, rad3R9
Changes since 3.11:	+4 -16 lines
Log Message:	Added tmCvLuminance() call
#	User	Rev	Content
1	gwlarson	3.1	#ifndef lint
2	greg	3.12	static const char RCSid[] = "$Id: tmapluv.c,v 3.11 2005/01/07 21:41:06 greg 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	greg	3.10	static MEM_PTR luv32Init(TMstruct *);
34			static void luv32NewSpace(TMstruct *);
35			static MEM_PTR luv24Init(TMstruct *);
36			static void luv24NewSpace(TMstruct *);
37	greg	3.4	#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	greg	3.10	uv2rgb(rgb, tms, uvp) /* compute RGB from uv coordinate */
69	gwlarson	3.1	BYTE rgb[3];
70	greg	3.10	register TMstruct *tms;
71	gwlarson	3.1	double uvp[2];
72	greg	3.10	{ /* Should check that tms->inppri==TM_XYZPRIM beforehand... */
73	gwlarson	3.1	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	greg	3.10	XYZ[CIEY] = 1./tms->inpsf;
80	gwlarson	3.1	XYZ[CIEX] = x/y * XYZ[CIEY];
81			XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
82			/* convert to RGB and clip */
83	greg	3.10	colortrans(RGB, tms->cmat, XYZ);
84	greg	3.4	clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
85	gwlarson	3.1	/* perform final scaling & gamma */
86	greg	3.10	d = tms->clf[RED] * RGB[RED];
87			rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
88			d = tms->clf[GRN] * RGB[GRN];
89			rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
90			d = tms->clf[BLU] * RGB[BLU];
91			rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
92	gwlarson	3.1	}
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	greg	3.10	tmCvLuv32( /* convert raw 32-bit LogLuv values */
127			TMstruct *tms,
128			TMbright *ls,
129			BYTE *cs,
130			uint32 *luvs,
131			int len
132			)
133	gwlarson	3.1	{
134	greg	3.11	static const char funcName[] = "tmCvLuv32";
135	gwlarson	3.1	double uvp[2];
136			register LUV32DATA *ld;
137			register int i, j;
138			/* check arguments */
139	greg	3.10	if (tms == NULL)
140	gwlarson	3.1	returnErr(TM_E_TMINVAL);
141	schorsch	3.9	if ((ls == NULL) \| (luvs == NULL) \| (len < 0))
142	gwlarson	3.1	returnErr(TM_E_ILLEGAL);
143			/* check package registration */
144	greg	3.4	if (luv32Reg < 0) {
145			if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
146			returnErr(TM_E_CODERR1);
147			tmMkMesofact();
148			}
149	gwlarson	3.1	/* get package data */
150	greg	3.10	if ((ld = (LUV32DATA *)tmPkgData(tms,luv32Reg)) == NULL)
151	gwlarson	3.1	returnErr(TM_E_NOMEM);
152			/* convert each pixel */
153			for (i = len; i--; ) {
154			j = luvs[i] >> 16; /* get luminance */
155			if (j & 0x8000) /* negative luminance */
156	gwlarson	3.3	ls[i] = TM_NOBRT; /* assign bogus value */
157	gwlarson	3.1	else /* else convert to lnL */
158	greg	3.4	ls[i] = (BRT2SCALE(j) >> 8) - ld->offset;
159	gwlarson	3.1	if (cs == TM_NOCHROM) /* no color? */
160			continue;
161			/* get chrominance */
162	greg	3.10	if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
163	gwlarson	3.1	uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
164			uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
165			ls[i] = compmeshift(ls[i], uvp);
166	greg	3.10	j = tms->flags&TM_F_BW \|\| ls[i]<BMESLOWER
167	gwlarson	3.1	? UVNEU
168			: (int)(uvp[0]*UVSCALE)<<8
169			\| (int)(uvp[1]*UVSCALE);
170			} else {
171	greg	3.10	j = tms->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
172	gwlarson	3.1	}
173			if (!isuvset(ld, j)) {
174	greg	3.4	uvp[0] = 1./UVSCALE*((j>>8) + .5);
175			uvp[1] = 1./UVSCALE*((j & 0xff) + .5);
176	greg	3.10	uv2rgb(ld->rgbval[j], tms, uvp);
177	gwlarson	3.1	setuv(ld, j);
178			}
179			cs[3*i ] = ld->rgbval[j][RED];
180			cs[3*i+1] = ld->rgbval[j][GRN];
181			cs[3*i+2] = ld->rgbval[j][BLU];
182			}
183			returnOK;
184			}
185
186
187			int
188	greg	3.10	tmCvLuv24( /* convert raw 24-bit LogLuv values */
189			TMstruct *tms,
190			TMbright *ls,
191			BYTE *cs,
192			uint32 *luvs,
193			int len
194			)
195	gwlarson	3.1	{
196			char funcName[] = "tmCvLuv24";
197			double uvp[2];
198			register LUV24DATA *ld;
199			register int i, j;
200			/* check arguments */
201	greg	3.10	if (tms == NULL)
202	gwlarson	3.1	returnErr(TM_E_TMINVAL);
203	schorsch	3.9	if ((ls == NULL) \| (luvs == NULL) \| (len < 0))
204	gwlarson	3.1	returnErr(TM_E_ILLEGAL);
205			/* check package registration */
206	greg	3.4	if (luv24Reg < 0) {
207			if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
208			returnErr(TM_E_CODERR1);
209			tmMkMesofact();
210			}
211	gwlarson	3.1	/* get package data */
212	greg	3.10	if ((ld = (LUV24DATA *)tmPkgData(tms,luv24Reg)) == NULL)
213	gwlarson	3.1	returnErr(TM_E_NOMEM);
214			/* convert each pixel */
215			for (i = len; i--; ) {
216			j = luvs[i] >> 14; /* get luminance */
217	greg	3.4	ls[i] = (BRT2SCALE(j) >> 6) - ld->offset;
218	gwlarson	3.1	if (cs == TM_NOCHROM) /* no color? */
219			continue;
220			/* get chrominance */
221	greg	3.10	if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
222	greg	3.8	if (uv_decode(&uvp[0], &uvp[1], luvs[i]&0x3fff) < 0) {
223	gwlarson	3.1	uvp[0] = U_NEU; /* should barf? */
224			uvp[1] = V_NEU;
225			}
226			ls[i] = compmeshift(ls[i], uvp);
227	greg	3.10	if (tms->flags&TM_F_BW \|\| ls[i]<BMESLOWER
228	greg	3.4	\|\| (j = uv_encode(uvp[0], uvp[1],
229			SGILOGENCODE_NODITHER)) < 0)
230	gwlarson	3.1	j = uv14neu;
231			} else {
232	greg	3.10	j = tms->flags&TM_F_BW ? uv14neu :
233	greg	3.7	(int)(luvs[i]&0x3fff);
234	gwlarson	3.1	}
235			if (!isuvset(ld, j)) {
236	greg	3.4	if (uv_decode(&uvp[0], &uvp[1], j) < 0) {
237	gwlarson	3.2	uvp[0] = U_NEU; uvp[1] = V_NEU;
238	gwlarson	3.1	}
239	greg	3.10	uv2rgb(ld->rgbval[j], tms, uvp);
240	gwlarson	3.1	setuv(ld, j);
241			}
242			cs[3*i ] = ld->rgbval[j][RED];
243			cs[3*i+1] = ld->rgbval[j][GRN];
244			cs[3*i+2] = ld->rgbval[j][BLU];
245			}
246			returnOK;
247			}
248
249
250			int
251	greg	3.10	tmCvL16( /* convert 16-bit LogL values */
252			TMstruct *tms,
253			TMbright *ls,
254			uint16 *l16s,
255			int len
256			)
257	gwlarson	3.1	{
258	greg	3.11	static const char funcName[] = "tmCvL16";
259	gwlarson	3.1	static double lastsf;
260			static int offset;
261			register int i;
262			/* check arguments */
263	greg	3.10	if (tms == NULL)
264	gwlarson	3.1	returnErr(TM_E_TMINVAL);
265	schorsch	3.9	if ((ls == NULL) \| (l16s == NULL) \| (len < 0))
266	gwlarson	3.1	returnErr(TM_E_ILLEGAL);
267			/* check scaling offset */
268	greg	3.10	if (!FEQ(tms->inpsf, lastsf)) {
269	greg	3.12	offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
270	greg	3.10	lastsf = tms->inpsf;
271	gwlarson	3.1	}
272			/* convert each pixel */
273			for (i = len; i--; ) {
274			if (l16s[i] & 0x8000) /* negative luminance */
275	gwlarson	3.3	ls[i] = TM_NOBRT; /* assign bogus value */
276	gwlarson	3.1	else /* else convert to lnL */
277	greg	3.4	ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset;
278	gwlarson	3.1	}
279			returnOK;
280			}
281
282
283			static void
284	greg	3.10	luv32NewSpace(tms) /* initialize 32-bit LogLuv color space */
285			TMstruct *tms;
286	gwlarson	3.1	{
287			register LUV32DATA *ld;
288
289	greg	3.10	if (tms->inppri != TM_XYZPRIM) { /* panic time! */
290	gwlarson	3.1	fputs("Improper input color space in luv32NewSpace!\n", stderr);
291			exit(1);
292			}
293	greg	3.10	ld = (LUV32DATA *)tms->pd[luv32Reg];
294	greg	3.12	ld->offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
295	gwlarson	3.1	clruvall(ld);
296			}
297
298
299			static MEM_PTR
300	greg	3.10	luv32Init(tms) /* allocate data for 32-bit LogLuv decoder */
301			TMstruct *tms;
302	gwlarson	3.1	{
303			register LUV32DATA *ld;
304
305			ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
306			if (ld == NULL)
307			return(NULL);
308	greg	3.10	tms->pd[luv32Reg] = (MEM_PTR)ld;
309			luv32NewSpace(tms);
310	gwlarson	3.1	return((MEM_PTR)ld);
311			}
312
313
314			static void
315	greg	3.10	luv24NewSpace(tms) /* initialize 24-bit LogLuv color space */
316			TMstruct *tms;
317	gwlarson	3.1	{
318			register LUV24DATA *ld;
319
320	greg	3.10	if (tms->inppri != TM_XYZPRIM) { /* panic time! */
321	gwlarson	3.1	fputs("Improper input color space in luv24NewSpace!\n", stderr);
322			exit(1);
323			}
324	greg	3.10	ld = (LUV24DATA *)tms->pd[luv24Reg];
325	greg	3.12	ld->offset = BRT2SCALE(12) - tmCvLuminance(tms->inpsf);
326	gwlarson	3.1	clruvall(ld);
327			}
328
329
330			static MEM_PTR
331	greg	3.10	luv24Init(tms) /* allocate data for 24-bit LogLuv decoder */
332			TMstruct *tms;
333	gwlarson	3.1	{
334			register LUV24DATA *ld;
335
336			ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
337			if (ld == NULL)
338			return(NULL);
339	greg	3.10	tms->pd[luv24Reg] = (MEM_PTR)ld;
340	greg	3.4	if (uv14neu < 0) /* initialize neutral color index */
341			uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
342	greg	3.10	luv24NewSpace(tms);
343	gwlarson	3.1	return((MEM_PTR)ld);
344			}