src/common/tmapluv.c

#ifndef lint
static const char       RCSid[] = "$Id: tmapluv.c,v 3.15 2010/12/02 18:10:40 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 <stdlib.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 */
        uby8    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 */
        uby8    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 */
uby8    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,
uby8    *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,
uby8    *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:	3.16
Committed:	Fri May 20 02:06:38 2011 UTC (12 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R2, rad4R2P2, rad5R0, rad5R1, rad4R2, rad4R1, rad4R2P1, rad5R3
Changes since 3.15:	+6 -6 lines
Log Message:	Changed every instance of BYTE to uby8 to avoid conflicts
#	User	Rev	Content
1	gwlarson	3.1	#ifndef lint
2	greg	3.16	static const char RCSid[] = "$Id: tmapluv.c,v 3.15 2010/12/02 18:10:40 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	3.14	#include <stdlib.h>
16	greg	3.4	#include <string.h>
17	gwlarson	3.1	#include <math.h>
18	greg	3.15	#include "tiffio.h"
19	greg	3.13	#include "tmprivat.h"
20	greg	3.4	#include "tmaptiff.h"
21	gwlarson	3.1
22			#define uvflgop(p,uv,op) ((p)->rgbflg[(uv)>>5] op (1L<<((uv)&0x1f)))
23			#define isuvset(p,uv) uvflgop(p,uv,&)
24			#define setuv(p,uv) uvflgop(p,uv,\|=)
25			#define clruv(p,uv) uvflgop(p,uv,&=~)
26	schorsch	3.6	#define clruvall(p) memset((MEM_PTR)(p)->rgbflg,'\0',sizeof((p)->rgbflg))
27	gwlarson	3.1
28	greg	3.4	#ifdef NOPROTO
29	gwlarson	3.1	static MEM_PTR luv32Init();
30			static void luv32NewSpace();
31			static MEM_PTR luv24Init();
32			static void luv24NewSpace();
33	greg	3.4	#else
34	greg	3.10	static MEM_PTR luv32Init(TMstruct *);
35			static void luv32NewSpace(TMstruct *);
36			static MEM_PTR luv24Init(TMstruct *);
37			static void luv24NewSpace(TMstruct *);
38	greg	3.4	#endif
39	gwlarson	3.1
40			typedef struct {
41			int offset; /* computed luminance offset */
42	greg	3.16	uby8 rgbval[1<<16][3]; /* computed RGB value for given uv */
43	gwlarson	3.1	uint32 rgbflg[1<<(16-5)]; /* flags for computed values */
44			} LUV32DATA; /* LogLuv 32-bit conversion data */
45
46			#define UVNEU ((int)(UVSCALE*U_NEU)<<8 \
47			\| (int)(UVSCALE*V_NEU))
48
49			static struct tmPackage luv32Pkg = { /* 32-bit package functions */
50			luv32Init, luv32NewSpace, free
51			};
52			static int luv32Reg = -1; /* 32-bit package reg. number */
53
54			typedef struct {
55			int offset; /* computed luminance offset */
56	greg	3.16	uby8 rgbval[1<<14][3]; /* computed rgb value for uv index */
57	gwlarson	3.1	uint32 rgbflg[1<<(14-5)]; /* flags for computed values */
58			} LUV24DATA; /* LogLuv 24-bit conversion data */
59
60			static struct tmPackage luv24Pkg = { /* 24-bit package functions */
61			luv24Init, luv24NewSpace, free
62			};
63			static int luv24Reg = -1; /* 24-bit package reg. number */
64
65			static int uv14neu = -1; /* neutral index for 14-bit (u',v') */
66
67
68	greg	3.4	static void
69	greg	3.10	uv2rgb(rgb, tms, uvp) /* compute RGB from uv coordinate */
70	greg	3.16	uby8 rgb[3];
71	greg	3.10	register TMstruct *tms;
72	gwlarson	3.1	double uvp[2];
73	greg	3.10	{ /* Should check that tms->inppri==TM_XYZPRIM beforehand... */
74	gwlarson	3.1	double d, x, y;
75	gwlarson	3.2	COLOR XYZ, RGB;
76	gwlarson	3.1	/* convert to XYZ */
77			d = 1./(6.uvp[0] - 16.uvp[1] + 12.);
78			x = 9.uvp[0] d;
79			y = 4.uvp[1] d;
80	greg	3.10	XYZ[CIEY] = 1./tms->inpsf;
81	gwlarson	3.1	XYZ[CIEX] = x/y * XYZ[CIEY];
82			XYZ[CIEZ] = (1.-x-y)/y * XYZ[CIEY];
83			/* convert to RGB and clip */
84	greg	3.10	colortrans(RGB, tms->cmat, XYZ);
85	greg	3.4	clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
86	gwlarson	3.1	/* perform final scaling & gamma */
87	greg	3.10	d = tms->clf[RED] * RGB[RED];
88			rgb[RED] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
89			d = tms->clf[GRN] * RGB[GRN];
90			rgb[GRN] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
91			d = tms->clf[BLU] * RGB[BLU];
92			rgb[BLU] = d>=.999 ? 255 : (int)(256.*pow(d, 1./tms->mongam));
93	gwlarson	3.1	}
94
95
96			static TMbright
97			compmeshift(li, uvp) /* compute mesopic color shift */
98			TMbright li; /* encoded world luminance */
99			double uvp[2]; /* world (u',v') -> returned desaturated */
100			{
101	greg	3.4	double scotrat;
102			register double d;
103	gwlarson	3.2
104			if (li >= BMESUPPER)
105			return(li);
106	greg	3.4	scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343;
107	gwlarson	3.2	if (li <= BMESLOWER) {
108			d = 0.;
109			uvp[0] = U_NEU; uvp[1] = V_NEU;
110			} else {
111	greg	3.4	d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.);
112	gwlarson	3.2	uvp[0] = duvp[0] + (1.-d)U_NEU;
113			uvp[1] = duvp[1] + (1.-d)V_NEU;
114			}
115	greg	3.4	/*
116			d = li + (double)TM_BRTSCALElog(d + (1.-d)scotrat);
117			*/
118			d = d + (1.-d)*scotrat;
119			d -= 1.; /* Taylor expansion of log(x) about 1 */
120			d = d(1. + d(-.5 + d(1./3. + d-.125)));
121			d = li + (double)TM_BRTSCALE*d;
122			return((TMbright)(d>0. ? d+.5 : d-.5));
123	gwlarson	3.1	}
124
125
126			int
127	greg	3.10	tmCvLuv32( /* convert raw 32-bit LogLuv values */
128			TMstruct *tms,
129			TMbright *ls,
130	greg	3.16	uby8 *cs,
131	greg	3.10	uint32 *luvs,
132			int len
133			)
134	gwlarson	3.1	{
135	greg	3.11	static const char funcName[] = "tmCvLuv32";
136	gwlarson	3.1	double uvp[2];
137			register LUV32DATA *ld;
138			register int i, j;
139			/* check arguments */
140	greg	3.10	if (tms == NULL)
141	gwlarson	3.1	returnErr(TM_E_TMINVAL);
142	schorsch	3.9	if ((ls == NULL) \| (luvs == NULL) \| (len < 0))
143	gwlarson	3.1	returnErr(TM_E_ILLEGAL);
144			/* check package registration */
145	greg	3.4	if (luv32Reg < 0) {
146			if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
147			returnErr(TM_E_CODERR1);
148			tmMkMesofact();
149			}
150	gwlarson	3.1	/* get package data */
151	greg	3.10	if ((ld = (LUV32DATA *)tmPkgData(tms,luv32Reg)) == NULL)
152	gwlarson	3.1	returnErr(TM_E_NOMEM);
153			/* convert each pixel */
154			for (i = len; i--; ) {
155			j = luvs[i] >> 16; /* get luminance */
156			if (j & 0x8000) /* negative luminance */
157	gwlarson	3.3	ls[i] = TM_NOBRT; /* assign bogus value */
158	gwlarson	3.1	else /* else convert to lnL */
159	greg	3.4	ls[i] = (BRT2SCALE(j) >> 8) - ld->offset;
160	gwlarson	3.1	if (cs == TM_NOCHROM) /* no color? */
161			continue;
162			/* get chrominance */
163	greg	3.10	if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
164	gwlarson	3.1	uvp[0] = 1./UVSCALE*((luvs[i]>>8 & 0xff) + .5);
165			uvp[1] = 1./UVSCALE*((luvs[i] & 0xff) + .5);
166			ls[i] = compmeshift(ls[i], uvp);
167	greg	3.10	j = tms->flags&TM_F_BW \|\| ls[i]<BMESLOWER
168	gwlarson	3.1	? UVNEU
169			: (int)(uvp[0]*UVSCALE)<<8
170			\| (int)(uvp[1]*UVSCALE);
171			} else {
172	greg	3.10	j = tms->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
173	gwlarson	3.1	}
174			if (!isuvset(ld, j)) {
175	greg	3.4	uvp[0] = 1./UVSCALE*((j>>8) + .5);
176			uvp[1] = 1./UVSCALE*((j & 0xff) + .5);
177	greg	3.10	uv2rgb(ld->rgbval[j], tms, uvp);
178	gwlarson	3.1	setuv(ld, j);
179			}
180			cs[3*i ] = ld->rgbval[j][RED];
181			cs[3*i+1] = ld->rgbval[j][GRN];
182			cs[3*i+2] = ld->rgbval[j][BLU];
183			}
184			returnOK;
185			}
186
187
188			int
189	greg	3.10	tmCvLuv24( /* convert raw 24-bit LogLuv values */
190			TMstruct *tms,
191			TMbright *ls,
192	greg	3.16	uby8 *cs,
193	greg	3.10	uint32 *luvs,
194			int len
195			)
196	gwlarson	3.1	{
197			char funcName[] = "tmCvLuv24";
198			double uvp[2];
199			register LUV24DATA *ld;
200			register int i, j;
201			/* check arguments */
202	greg	3.10	if (tms == NULL)
203	gwlarson	3.1	returnErr(TM_E_TMINVAL);
204	schorsch	3.9	if ((ls == NULL) \| (luvs == NULL) \| (len < 0))
205	gwlarson	3.1	returnErr(TM_E_ILLEGAL);
206			/* check package registration */
207	greg	3.4	if (luv24Reg < 0) {
208			if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
209			returnErr(TM_E_CODERR1);
210			tmMkMesofact();
211			}
212	gwlarson	3.1	/* get package data */
213	greg	3.10	if ((ld = (LUV24DATA *)tmPkgData(tms,luv24Reg)) == NULL)
214	gwlarson	3.1	returnErr(TM_E_NOMEM);
215			/* convert each pixel */
216			for (i = len; i--; ) {
217			j = luvs[i] >> 14; /* get luminance */
218	greg	3.4	ls[i] = (BRT2SCALE(j) >> 6) - ld->offset;
219	gwlarson	3.1	if (cs == TM_NOCHROM) /* no color? */
220			continue;
221			/* get chrominance */
222	greg	3.10	if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
223	greg	3.8	if (uv_decode(&uvp[0], &uvp[1], luvs[i]&0x3fff) < 0) {
224	gwlarson	3.1	uvp[0] = U_NEU; /* should barf? */
225			uvp[1] = V_NEU;
226			}
227			ls[i] = compmeshift(ls[i], uvp);
228	greg	3.10	if (tms->flags&TM_F_BW \|\| ls[i]<BMESLOWER
229	greg	3.4	\|\| (j = uv_encode(uvp[0], uvp[1],
230			SGILOGENCODE_NODITHER)) < 0)
231	gwlarson	3.1	j = uv14neu;
232			} else {
233	greg	3.10	j = tms->flags&TM_F_BW ? uv14neu :
234	greg	3.7	(int)(luvs[i]&0x3fff);
235	gwlarson	3.1	}
236			if (!isuvset(ld, j)) {
237	greg	3.4	if (uv_decode(&uvp[0], &uvp[1], j) < 0) {
238	gwlarson	3.2	uvp[0] = U_NEU; uvp[1] = V_NEU;
239	gwlarson	3.1	}
240	greg	3.10	uv2rgb(ld->rgbval[j], tms, uvp);
241	gwlarson	3.1	setuv(ld, j);
242			}
243			cs[3*i ] = ld->rgbval[j][RED];
244			cs[3*i+1] = ld->rgbval[j][GRN];
245			cs[3*i+2] = ld->rgbval[j][BLU];
246			}
247			returnOK;
248			}
249
250
251			int
252	greg	3.10	tmCvL16( /* convert 16-bit LogL values */
253			TMstruct *tms,
254			TMbright *ls,
255			uint16 *l16s,
256			int len
257			)
258	gwlarson	3.1	{
259	greg	3.11	static const char funcName[] = "tmCvL16";
260	gwlarson	3.1	static double lastsf;
261			static int offset;
262			register int i;
263			/* check arguments */
264	greg	3.10	if (tms == NULL)
265	gwlarson	3.1	returnErr(TM_E_TMINVAL);
266	schorsch	3.9	if ((ls == NULL) \| (l16s == NULL) \| (len < 0))
267	gwlarson	3.1	returnErr(TM_E_ILLEGAL);
268			/* check scaling offset */
269	greg	3.10	if (!FEQ(tms->inpsf, lastsf)) {
270	greg	3.12	offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
271	greg	3.10	lastsf = tms->inpsf;
272	gwlarson	3.1	}
273			/* convert each pixel */
274			for (i = len; i--; ) {
275			if (l16s[i] & 0x8000) /* negative luminance */
276	gwlarson	3.3	ls[i] = TM_NOBRT; /* assign bogus value */
277	gwlarson	3.1	else /* else convert to lnL */
278	greg	3.4	ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset;
279	gwlarson	3.1	}
280			returnOK;
281			}
282
283
284			static void
285	greg	3.10	luv32NewSpace(tms) /* initialize 32-bit LogLuv color space */
286			TMstruct *tms;
287	gwlarson	3.1	{
288			register LUV32DATA *ld;
289
290	greg	3.10	if (tms->inppri != TM_XYZPRIM) { /* panic time! */
291	gwlarson	3.1	fputs("Improper input color space in luv32NewSpace!\n", stderr);
292			exit(1);
293			}
294	greg	3.10	ld = (LUV32DATA *)tms->pd[luv32Reg];
295	greg	3.12	ld->offset = BRT2SCALE(64) - tmCvLuminance(tms->inpsf);
296	gwlarson	3.1	clruvall(ld);
297			}
298
299
300			static MEM_PTR
301	greg	3.10	luv32Init(tms) /* allocate data for 32-bit LogLuv decoder */
302			TMstruct *tms;
303	gwlarson	3.1	{
304			register LUV32DATA *ld;
305
306			ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
307			if (ld == NULL)
308			return(NULL);
309	greg	3.10	tms->pd[luv32Reg] = (MEM_PTR)ld;
310			luv32NewSpace(tms);
311	gwlarson	3.1	return((MEM_PTR)ld);
312			}
313
314
315			static void
316	greg	3.10	luv24NewSpace(tms) /* initialize 24-bit LogLuv color space */
317			TMstruct *tms;
318	gwlarson	3.1	{
319			register LUV24DATA *ld;
320
321	greg	3.10	if (tms->inppri != TM_XYZPRIM) { /* panic time! */
322	gwlarson	3.1	fputs("Improper input color space in luv24NewSpace!\n", stderr);
323			exit(1);
324			}
325	greg	3.10	ld = (LUV24DATA *)tms->pd[luv24Reg];
326	greg	3.12	ld->offset = BRT2SCALE(12) - tmCvLuminance(tms->inpsf);
327	gwlarson	3.1	clruvall(ld);
328			}
329
330
331			static MEM_PTR
332	greg	3.10	luv24Init(tms) /* allocate data for 24-bit LogLuv decoder */
333			TMstruct *tms;
334	gwlarson	3.1	{
335			register LUV24DATA *ld;
336
337			ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
338			if (ld == NULL)
339			return(NULL);
340	greg	3.10	tms->pd[luv24Reg] = (MEM_PTR)ld;
341	greg	3.4	if (uv14neu < 0) /* initialize neutral color index */
342			uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
343	greg	3.10	luv24NewSpace(tms);
344	gwlarson	3.1	return((MEM_PTR)ld);
345			}