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root/radiance/ray/src/common/tmapluv.c
Revision: 3.11
Committed: Fri Jan 7 21:41:06 2005 UTC (19 years, 3 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad3R7P2, rad3R7P1
Changes since 3.10: +3 -3 lines
Log Message:
Moved error codes inside passed TMstruct

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: tmapluv.c,v 3.10 2005/01/07 20:33:02 greg Exp $";
3 #endif
4 /*
5 * Routines for tone-mapping LogLuv encoded pixels.
6 *
7 * Externals declared in tmaptiff.h
8 */
9
10 #include "copyright.h"
11
12 #define LOGLUV_PUBLIC 1
13
14 #include <stdio.h>
15 #include <string.h>
16 #include <math.h>
17 #include "tiffio.h"
18 #include "tmprivat.h"
19 #include "tmaptiff.h"
20
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 #define clruvall(p) memset((MEM_PTR)(p)->rgbflg,'\0',sizeof((p)->rgbflg))
26
27 #ifdef NOPROTO
28 static MEM_PTR luv32Init();
29 static void luv32NewSpace();
30 static MEM_PTR luv24Init();
31 static void luv24NewSpace();
32 #else
33 static MEM_PTR luv32Init(TMstruct *);
34 static void luv32NewSpace(TMstruct *);
35 static MEM_PTR luv24Init(TMstruct *);
36 static void luv24NewSpace(TMstruct *);
37 #endif
38
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 static void
68 uv2rgb(rgb, tms, uvp) /* compute RGB from uv coordinate */
69 BYTE rgb[3];
70 register TMstruct *tms;
71 double uvp[2];
72 { /* Should check that tms->inppri==TM_XYZPRIM beforehand... */
73 double d, x, y;
74 COLOR XYZ, RGB;
75 /* 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./tms->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, tms->cmat, XYZ);
84 clipgamut(RGB, 1., CGAMUT_LOWER, cblack, cwhite);
85 /* perform final scaling & gamma */
86 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 }
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 double scotrat;
101 register double d;
102
103 if (li >= BMESUPPER)
104 return(li);
105 scotrat = (.767676768 - 1.02356902*uvp[1])/uvp[0] - .343434343;
106 if (li <= BMESLOWER) {
107 d = 0.;
108 uvp[0] = U_NEU; uvp[1] = V_NEU;
109 } else {
110 d = (tmMesofact[li-BMESLOWER] + .5) * (1./256.);
111 uvp[0] = d*uvp[0] + (1.-d)*U_NEU;
112 uvp[1] = d*uvp[1] + (1.-d)*V_NEU;
113 }
114 /*
115 d = li + (double)TM_BRTSCALE*log(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 }
123
124
125 int
126 tmCvLuv32( /* convert raw 32-bit LogLuv values */
127 TMstruct *tms,
128 TMbright *ls,
129 BYTE *cs,
130 uint32 *luvs,
131 int len
132 )
133 {
134 static const char funcName[] = "tmCvLuv32";
135 double uvp[2];
136 register LUV32DATA *ld;
137 register int i, j;
138 /* check arguments */
139 if (tms == NULL)
140 returnErr(TM_E_TMINVAL);
141 if ((ls == NULL) | (luvs == NULL) | (len < 0))
142 returnErr(TM_E_ILLEGAL);
143 /* check package registration */
144 if (luv32Reg < 0) {
145 if ((luv32Reg = tmRegPkg(&luv32Pkg)) < 0)
146 returnErr(TM_E_CODERR1);
147 tmMkMesofact();
148 }
149 /* get package data */
150 if ((ld = (LUV32DATA *)tmPkgData(tms,luv32Reg)) == NULL)
151 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 ls[i] = TM_NOBRT; /* assign bogus value */
157 else /* else convert to lnL */
158 ls[i] = (BRT2SCALE(j) >> 8) - ld->offset;
159 if (cs == TM_NOCHROM) /* no color? */
160 continue;
161 /* get chrominance */
162 if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
163 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 j = tms->flags&TM_F_BW || ls[i]<BMESLOWER
167 ? UVNEU
168 : (int)(uvp[0]*UVSCALE)<<8
169 | (int)(uvp[1]*UVSCALE);
170 } else {
171 j = tms->flags&TM_F_BW ? UVNEU : luvs[i]&0xffff;
172 }
173 if (!isuvset(ld, j)) {
174 uvp[0] = 1./UVSCALE*((j>>8) + .5);
175 uvp[1] = 1./UVSCALE*((j & 0xff) + .5);
176 uv2rgb(ld->rgbval[j], tms, uvp);
177 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 tmCvLuv24( /* convert raw 24-bit LogLuv values */
189 TMstruct *tms,
190 TMbright *ls,
191 BYTE *cs,
192 uint32 *luvs,
193 int len
194 )
195 {
196 char funcName[] = "tmCvLuv24";
197 double uvp[2];
198 register LUV24DATA *ld;
199 register int i, j;
200 /* check arguments */
201 if (tms == NULL)
202 returnErr(TM_E_TMINVAL);
203 if ((ls == NULL) | (luvs == NULL) | (len < 0))
204 returnErr(TM_E_ILLEGAL);
205 /* check package registration */
206 if (luv24Reg < 0) {
207 if ((luv24Reg = tmRegPkg(&luv24Pkg)) < 0)
208 returnErr(TM_E_CODERR1);
209 tmMkMesofact();
210 }
211 /* get package data */
212 if ((ld = (LUV24DATA *)tmPkgData(tms,luv24Reg)) == NULL)
213 returnErr(TM_E_NOMEM);
214 /* convert each pixel */
215 for (i = len; i--; ) {
216 j = luvs[i] >> 14; /* get luminance */
217 ls[i] = (BRT2SCALE(j) >> 6) - ld->offset;
218 if (cs == TM_NOCHROM) /* no color? */
219 continue;
220 /* get chrominance */
221 if (tms->flags & TM_F_MESOPIC && ls[i] < BMESUPPER) {
222 if (uv_decode(&uvp[0], &uvp[1], luvs[i]&0x3fff) < 0) {
223 uvp[0] = U_NEU; /* should barf? */
224 uvp[1] = V_NEU;
225 }
226 ls[i] = compmeshift(ls[i], uvp);
227 if (tms->flags&TM_F_BW || ls[i]<BMESLOWER
228 || (j = uv_encode(uvp[0], uvp[1],
229 SGILOGENCODE_NODITHER)) < 0)
230 j = uv14neu;
231 } else {
232 j = tms->flags&TM_F_BW ? uv14neu :
233 (int)(luvs[i]&0x3fff);
234 }
235 if (!isuvset(ld, j)) {
236 if (uv_decode(&uvp[0], &uvp[1], j) < 0) {
237 uvp[0] = U_NEU; uvp[1] = V_NEU;
238 }
239 uv2rgb(ld->rgbval[j], tms, uvp);
240 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 tmCvL16( /* convert 16-bit LogL values */
252 TMstruct *tms,
253 TMbright *ls,
254 uint16 *l16s,
255 int len
256 )
257 {
258 static const char funcName[] = "tmCvL16";
259 static double lastsf;
260 static int offset;
261 register int i;
262 /* check arguments */
263 if (tms == NULL)
264 returnErr(TM_E_TMINVAL);
265 if ((ls == NULL) | (l16s == NULL) | (len < 0))
266 returnErr(TM_E_ILLEGAL);
267 /* check scaling offset */
268 if (!FEQ(tms->inpsf, lastsf)) {
269 offset = BRT2SCALE(64);
270 if (tms->inpsf > 1.0001)
271 offset -= (int)(TM_BRTSCALE*log(tms->inpsf)+.5);
272 else if (tms->inpsf < 0.9999)
273 offset -= (int)(TM_BRTSCALE*log(tms->inpsf)-.5);
274 lastsf = tms->inpsf;
275 }
276 /* convert each pixel */
277 for (i = len; i--; ) {
278 if (l16s[i] & 0x8000) /* negative luminance */
279 ls[i] = TM_NOBRT; /* assign bogus value */
280 else /* else convert to lnL */
281 ls[i] = (BRT2SCALE(l16s[i]) >> 8) - offset;
282 }
283 returnOK;
284 }
285
286
287 static void
288 luv32NewSpace(tms) /* initialize 32-bit LogLuv color space */
289 TMstruct *tms;
290 {
291 register LUV32DATA *ld;
292
293 if (tms->inppri != TM_XYZPRIM) { /* panic time! */
294 fputs("Improper input color space in luv32NewSpace!\n", stderr);
295 exit(1);
296 }
297 ld = (LUV32DATA *)tms->pd[luv32Reg];
298 ld->offset = BRT2SCALE(64);
299 if (tms->inpsf > 1.0001)
300 ld->offset -= (int)(TM_BRTSCALE*log(tms->inpsf)+.5);
301 else if (tms->inpsf < 0.9999)
302 ld->offset -= (int)(TM_BRTSCALE*log(tms->inpsf)-.5);
303 clruvall(ld);
304 }
305
306
307 static MEM_PTR
308 luv32Init(tms) /* allocate data for 32-bit LogLuv decoder */
309 TMstruct *tms;
310 {
311 register LUV32DATA *ld;
312
313 ld = (LUV32DATA *)malloc(sizeof(LUV32DATA));
314 if (ld == NULL)
315 return(NULL);
316 tms->pd[luv32Reg] = (MEM_PTR)ld;
317 luv32NewSpace(tms);
318 return((MEM_PTR)ld);
319 }
320
321
322 static void
323 luv24NewSpace(tms) /* initialize 24-bit LogLuv color space */
324 TMstruct *tms;
325 {
326 register LUV24DATA *ld;
327
328 if (tms->inppri != TM_XYZPRIM) { /* panic time! */
329 fputs("Improper input color space in luv24NewSpace!\n", stderr);
330 exit(1);
331 }
332 ld = (LUV24DATA *)tms->pd[luv24Reg];
333 ld->offset = BRT2SCALE(12);
334 if (tms->inpsf > 1.0001)
335 ld->offset -= (int)(TM_BRTSCALE*log(tms->inpsf)+.5);
336 else if (tms->inpsf < 0.9999)
337 ld->offset -= (int)(TM_BRTSCALE*log(tms->inpsf)-.5);
338 clruvall(ld);
339 }
340
341
342 static MEM_PTR
343 luv24Init(tms) /* allocate data for 24-bit LogLuv decoder */
344 TMstruct *tms;
345 {
346 register LUV24DATA *ld;
347
348 ld = (LUV24DATA *)malloc(sizeof(LUV24DATA));
349 if (ld == NULL)
350 return(NULL);
351 tms->pd[luv24Reg] = (MEM_PTR)ld;
352 if (uv14neu < 0) /* initialize neutral color index */
353 uv14neu = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
354 luv24NewSpace(tms);
355 return((MEM_PTR)ld);
356 }