| 1 |
/* RCSid $Id: tonemap.h,v 3.30 2021/03/02 20:09:14 greg Exp $ */ |
| 2 |
/* |
| 3 |
* Header file for tone mapping functions. |
| 4 |
* |
| 5 |
* Include after "color.h" |
| 6 |
*/ |
| 7 |
#ifndef _RAD_TONEMAP_H_ |
| 8 |
#define _RAD_TONEMAP_H_ |
| 9 |
|
| 10 |
#include "tiff.h" /* needed for int32, etc. */ |
| 11 |
|
| 12 |
#ifdef __cplusplus |
| 13 |
extern "C" { |
| 14 |
#endif |
| 15 |
|
| 16 |
/**** Argument Macros ****/ |
| 17 |
/* flags of what to do */ |
| 18 |
#define TM_F_HCONTR 01 /* human contrast sensitivity */ |
| 19 |
#define TM_F_MESOPIC 02 /* mesopic color sensitivity */ |
| 20 |
#define TM_F_LINEAR 04 /* linear brightness mapping */ |
| 21 |
#define TM_F_ACUITY 010 /* acuity adjustment */ |
| 22 |
#define TM_F_VEIL 020 /* veiling glare */ |
| 23 |
#define TM_F_CWEIGHT 040 /* center weighting */ |
| 24 |
#define TM_F_FOVEAL 0100 /* use foveal sample size */ |
| 25 |
#define TM_F_BW 0200 /* luminance only */ |
| 26 |
#define TM_F_NOSTDERR 0400 /* don't report errors to stderr */ |
| 27 |
/* combined modes */ |
| 28 |
#define TM_F_CAMERA 0 |
| 29 |
#define TM_F_HUMAN (TM_F_HCONTR|TM_F_MESOPIC|TM_F_VEIL|\ |
| 30 |
TM_F_ACUITY|TM_F_FOVEAL) |
| 31 |
#define TM_F_UNIMPL (TM_F_CWEIGHT|TM_F_VEIL|TM_F_ACUITY|TM_F_FOVEAL) |
| 32 |
|
| 33 |
/* special pointer values */ |
| 34 |
#define TM_XYZPRIM (RGBPRIMP)NULL /* indicate XYZ primaries (Note 1) */ |
| 35 |
#define TM_NOCHROM (uby8 *)NULL /* indicate no chrominance */ |
| 36 |
#define TM_NOCHROMP (uby8 **)NULL /* indicate no chrominances */ |
| 37 |
#define TM_GETFILE (FILE *)NULL /* indicate file must be opened */ |
| 38 |
|
| 39 |
|
| 40 |
/**** Error Return Values ****/ |
| 41 |
|
| 42 |
#define TM_E_OK 0 /* normal return status */ |
| 43 |
#define TM_E_NOMEM 1 /* out of memory */ |
| 44 |
#define TM_E_ILLEGAL 2 /* illegal argument value */ |
| 45 |
#define TM_E_TMINVAL 3 /* no valid tone mapping */ |
| 46 |
#define TM_E_TMFAIL 4 /* cannot compute tone mapping */ |
| 47 |
#define TM_E_BADFILE 5 /* cannot open or understand file */ |
| 48 |
#define TM_E_CODERR1 6 /* code consistency error 1 */ |
| 49 |
#define TM_E_CODERR2 7 /* code consistency error 2 */ |
| 50 |
|
| 51 |
|
| 52 |
/**** Conversion Constants and Table Sizes ****/ |
| 53 |
|
| 54 |
#define TM_BRTSCALE 256 /* brightness scale factor (integer) */ |
| 55 |
|
| 56 |
#define TM_NOBRT (~0x7fff) /* bogus brightness value */ |
| 57 |
#define TM_NOLUM (1e-17) /* ridiculously small luminance */ |
| 58 |
|
| 59 |
#define TM_BRES 4096 /* luminance tone-map resolution */ |
| 60 |
|
| 61 |
#define TM_MAXPKG 8 /* maximum number of color formats */ |
| 62 |
|
| 63 |
|
| 64 |
/**** Global Data Types and Structures ****/ |
| 65 |
|
| 66 |
#ifndef MEM_PTR |
| 67 |
#define MEM_PTR void * |
| 68 |
#endif |
| 69 |
#ifndef HIST_TYP |
| 70 |
#define HIST_TYP unsigned long |
| 71 |
#endif |
| 72 |
#ifndef TMAP_TYP |
| 73 |
#define TMAP_TYP uint16 |
| 74 |
#endif |
| 75 |
|
| 76 |
extern char *tmErrorMessage[]; /* error messages */ |
| 77 |
|
| 78 |
typedef short TMbright; /* encoded luminance type */ |
| 79 |
|
| 80 |
/* basic tone mapping data structure */ |
| 81 |
typedef struct { |
| 82 |
int flags; /* flags of what to do */ |
| 83 |
RGBPRIMP monpri; /* monitor RGB primaries */ |
| 84 |
double mongam; /* monitor gamma value (approx.) */ |
| 85 |
COLOR clf; /* computed luminance coefficients */ |
| 86 |
int cdiv[3]; /* computed color divisors */ |
| 87 |
RGBPRIMP inppri; /* current input primaries */ |
| 88 |
double inpsf; /* current input scalefactor */ |
| 89 |
MEM_PTR inpdat; /* current input client data */ |
| 90 |
COLORMAT cmat; /* color conversion matrix */ |
| 91 |
TMbright hbrmin, hbrmax; /* histogram brightness limits */ |
| 92 |
HIST_TYP *histo; /* input histogram */ |
| 93 |
TMbright mbrmin, mbrmax; /* mapped brightness limits */ |
| 94 |
TMAP_TYP *lumap; /* computed luminance map */ |
| 95 |
MEM_PTR pd[TM_MAXPKG]; /* pointers to private data */ |
| 96 |
int lastError; /* last error incurred */ |
| 97 |
const char *lastFunc; /* error-generating function name */ |
| 98 |
} TMstruct; |
| 99 |
|
| 100 |
/* conversion package functions */ |
| 101 |
struct tmPackage { |
| 102 |
MEM_PTR (*Init)(TMstruct *tms); |
| 103 |
void (*NewSpace)(TMstruct *tms); |
| 104 |
void (*Free)(MEM_PTR pp); |
| 105 |
}; |
| 106 |
/* our list of conversion packages */ |
| 107 |
extern struct tmPackage *tmPkg[TM_MAXPKG]; |
| 108 |
extern int tmNumPkgs; /* number of registered packages */ |
| 109 |
|
| 110 |
|
| 111 |
/**** Useful Macros ****/ |
| 112 |
|
| 113 |
/* compute luminance from encoded value */ |
| 114 |
#define tmLuminance(li) exp((li)*(1./TM_BRTSCALE)) |
| 115 |
|
| 116 |
/* does tone mapping need color matrix? */ |
| 117 |
#define tmNeedMatrix(t) ((t)->monpri != (t)->inppri) |
| 118 |
|
| 119 |
/* register a conversion package */ |
| 120 |
#define tmRegPkg(pf) ( tmNumPkgs >= TM_MAXPKG ? -1 : \ |
| 121 |
(tmPkg[tmNumPkgs] = (pf), tmNumPkgs++) ) |
| 122 |
|
| 123 |
/* get the specific package's data */ |
| 124 |
#define tmPkgData(t,i) ((t)->pd[i]!=NULL ? (t)->pd[i] : (*tmPkg[i]->Init)(t)) |
| 125 |
|
| 126 |
|
| 127 |
/**** Library Function Calls ****/ |
| 128 |
|
| 129 |
extern TMbright |
| 130 |
tmCvLuminance(double lum); |
| 131 |
/* |
| 132 |
Convert a single luminance value to an encoded brightness value. |
| 133 |
*/ |
| 134 |
|
| 135 |
extern int |
| 136 |
tmCvLums(TMbright *ls, float *scan, int len); |
| 137 |
/* |
| 138 |
Convert luminance values to encoded brightness values using lookup. |
| 139 |
|
| 140 |
ls - returned encoded luminance values. |
| 141 |
scan - input scanline. |
| 142 |
len - scanline length. |
| 143 |
|
| 144 |
returns - 0 on success, TM_E_* on error. |
| 145 |
*/ |
| 146 |
|
| 147 |
extern TMstruct * |
| 148 |
tmInit(int flags, RGBPRIMP monpri, double gamval); |
| 149 |
/* |
| 150 |
Allocate and initialize new tone mapping. |
| 151 |
|
| 152 |
flags - TM_F_* flags indicating what is to be done. |
| 153 |
monpri - display monitor primaries (Note 1). |
| 154 |
gamval - display gamma response (can be approximate). |
| 155 |
|
| 156 |
returns - new tone-mapping pointer, or NULL if no memory. |
| 157 |
*/ |
| 158 |
|
| 159 |
extern int |
| 160 |
tmSetSpace(TMstruct *tms, RGBPRIMP pri, double sf, MEM_PTR dat); |
| 161 |
/* |
| 162 |
Set color primaries and scale factor for incoming scanlines. |
| 163 |
|
| 164 |
tms - tone mapping structure pointer. |
| 165 |
pri - RGB color input primaries (Note 1). |
| 166 |
sf - scale factor to get to luminance in cd/m^2. |
| 167 |
dat - application-specific data (NULL if not needed) |
| 168 |
|
| 169 |
returns - 0 on success, TM_E_* code on failure. |
| 170 |
*/ |
| 171 |
|
| 172 |
extern void |
| 173 |
tmClearHisto(TMstruct *tms); |
| 174 |
/* |
| 175 |
Clear histogram for current tone mapping. |
| 176 |
|
| 177 |
tms - tone mapping structure pointer. |
| 178 |
*/ |
| 179 |
|
| 180 |
extern int |
| 181 |
tmAddHisto(TMstruct *tms, TMbright *ls, int len, int wt); |
| 182 |
/* |
| 183 |
Add brightness values to current histogram. |
| 184 |
|
| 185 |
tms - tone mapping structure pointer. |
| 186 |
ls - encoded luminance values. |
| 187 |
len - number of luminance values. |
| 188 |
wt - integer weight to use for each value (usually 1 or -1). |
| 189 |
|
| 190 |
returns - 0 on success, TM_E_* on error. |
| 191 |
*/ |
| 192 |
|
| 193 |
extern int |
| 194 |
tmFixedMapping(TMstruct *tms, double expmult, double gamval, double Lddyn); |
| 195 |
/* |
| 196 |
Assign a fixed, linear tone-mapping using the given multiplier, |
| 197 |
which is the ratio of maximum output to uncalibrated input. |
| 198 |
This mapping will be used in subsequent calls to tmMapPixels() |
| 199 |
until a new tone mapping is computed. |
| 200 |
Only the min. and max. values are used from the histogram. |
| 201 |
|
| 202 |
tms - tone mapping structure pointer. |
| 203 |
expmult - the fixed exposure multiplier to use. |
| 204 |
gamval - display gamma response (0. for default). |
| 205 |
Lddyn - the display's dynamic range (0. for default). |
| 206 |
|
| 207 |
returns - 0 on success, TM_E_* on error. |
| 208 |
*/ |
| 209 |
|
| 210 |
extern int |
| 211 |
tmComputeMapping(TMstruct *tms, double gamval, double Lddyn, double Ldmax); |
| 212 |
/* |
| 213 |
Compute tone mapping function from the current histogram. |
| 214 |
This mapping will be used in subsequent calls to tmMapPixels() |
| 215 |
until a new tone mapping is computed. |
| 216 |
I.e., calls to tmAddHisto() have no immediate effect. |
| 217 |
|
| 218 |
tms - tone mapping structure pointer. |
| 219 |
gamval - display gamma response (0. for default). |
| 220 |
Lddyn - the display's dynamic range (0. for default). |
| 221 |
Ldmax - maximum display luminance in cd/m^2 (0. for default). |
| 222 |
|
| 223 |
returns - 0 on success, TM_E_* on failure. |
| 224 |
*/ |
| 225 |
|
| 226 |
extern int |
| 227 |
tmMapPixels(TMstruct *tms, uby8 *ps, TMbright *ls, uby8 *cs, int len); |
| 228 |
/* |
| 229 |
Apply tone mapping function to pixel values. |
| 230 |
|
| 231 |
tms - tone mapping structure pointer. |
| 232 |
ps - returned pixel values (Note 2). |
| 233 |
ls - encoded luminance values. |
| 234 |
cs - encoded chrominance values (Note 2). |
| 235 |
len - number of pixels. |
| 236 |
|
| 237 |
returns - 0 on success, TM_E_* on failure. |
| 238 |
*/ |
| 239 |
|
| 240 |
extern TMstruct * |
| 241 |
tmDup(TMstruct *orig); |
| 242 |
/* |
| 243 |
Duplicate the given tone mapping into a new struct. |
| 244 |
|
| 245 |
orig - tone mapping structure to duplicate. |
| 246 |
|
| 247 |
returns - pointer to new struct, or NULL on error. |
| 248 |
*/ |
| 249 |
|
| 250 |
extern void |
| 251 |
tmDone(TMstruct *tms); |
| 252 |
/* |
| 253 |
Free data associated with the given tone mapping structure. |
| 254 |
|
| 255 |
tms - tone mapping structure to free. |
| 256 |
*/ |
| 257 |
|
| 258 |
extern int |
| 259 |
tmCvGrays(TMstruct *tms, TMbright *ls, float *scan, int len); |
| 260 |
/* |
| 261 |
Convert gray float scanline to encoded luminance. |
| 262 |
|
| 263 |
tms - tone mapping structure pointer. |
| 264 |
ls - returned encoded luminance values. |
| 265 |
scan - input scanline. |
| 266 |
len - scanline length. |
| 267 |
|
| 268 |
returns - 0 on success, TM_E_* on error. |
| 269 |
*/ |
| 270 |
|
| 271 |
extern int |
| 272 |
tmCvColors(TMstruct *tms, TMbright *ls, uby8 *cs, COLOR *scan, int len); |
| 273 |
/* |
| 274 |
Convert RGB/XYZ float scanline to encoded luminance and chrominance. |
| 275 |
|
| 276 |
tms - tone mapping structure pointer. |
| 277 |
ls - returned encoded luminance values. |
| 278 |
cs - returned encoded chrominance values (Note 2). |
| 279 |
scan - input scanline. |
| 280 |
len - scanline length. |
| 281 |
|
| 282 |
returns - 0 on success, TM_E_* on error. |
| 283 |
*/ |
| 284 |
|
| 285 |
extern int |
| 286 |
tmCvColrs(TMstruct *tms, TMbright *ls, uby8 *cs, COLR *scan, int len); |
| 287 |
/* |
| 288 |
Convert RGBE/XYZE scanline to encoded luminance and chrominance. |
| 289 |
|
| 290 |
tms - tone mapping structure pointer. |
| 291 |
ls - returned encoded luminance values. |
| 292 |
cs - returned encoded chrominance values (Note 2). |
| 293 |
scan - input scanline. |
| 294 |
len - scanline length. |
| 295 |
|
| 296 |
returns - 0 on success, TM_E_* on error. |
| 297 |
*/ |
| 298 |
|
| 299 |
extern int |
| 300 |
tmLoadPicture(TMstruct *tms, TMbright **lpp, uby8 **cpp, int *xp, int *yp, |
| 301 |
char *fname, FILE *fp); |
| 302 |
/* |
| 303 |
Load Radiance picture and convert to tone mapping representation. |
| 304 |
Memory for the luminance and chroma arrays is allocated using |
| 305 |
malloc(3), and should be freed with free(3) when no longer needed. |
| 306 |
Calls tmSetSpace() to calibrate input color space. |
| 307 |
|
| 308 |
tms - tone mapping structure pointer. |
| 309 |
lpp - returned array of encoded luminances, picture ordering. |
| 310 |
cpp - returned array of encoded chrominances (Note 2). |
| 311 |
xp, yp - returned picture dimensions. |
| 312 |
fname - picture file name. |
| 313 |
fp - pointer to open file (Note 3). |
| 314 |
|
| 315 |
returns - 0 on success, TM_E_* on failure. |
| 316 |
*/ |
| 317 |
|
| 318 |
extern int |
| 319 |
tmMapPicture(uby8 **psp, int *xp, int *yp, int flags, |
| 320 |
RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax, |
| 321 |
char *fname, FILE *fp); |
| 322 |
/* |
| 323 |
Load and apply tone mapping to Radiance picture. |
| 324 |
If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture() |
| 325 |
calls pcond to perform the actual conversion, which takes |
| 326 |
longer but gives access to all the TM_F_* features. |
| 327 |
Memory for the final pixel array is allocated using malloc(3), |
| 328 |
and should be freed with free(3) when it is no longer needed. |
| 329 |
|
| 330 |
psp - returned array of tone mapped pixels, picture ordering. |
| 331 |
xp, yp - returned picture dimensions. |
| 332 |
flags - TM_F_* flags indicating what is to be done. |
| 333 |
monpri - display monitor primaries (Note 1). |
| 334 |
gamval - display gamma response. |
| 335 |
Lddyn - the display's dynamic range (0. for default). |
| 336 |
Ldmax - maximum display luminance in cd/m^2 (0. for default). |
| 337 |
fname - picture file name. |
| 338 |
fp - pointer to open file (Note 3). |
| 339 |
|
| 340 |
returns - 0 on success, TM_E_* on failure. |
| 341 |
*/ |
| 342 |
|
| 343 |
extern int |
| 344 |
tmCvRGB48(TMstruct *tms, TMbright *ls, uby8 *cs, uint16 (*scan)[3], |
| 345 |
int len, double gv); |
| 346 |
/* |
| 347 |
Convert 48-bit RGB scanline to encoded luminance and chrominance. |
| 348 |
|
| 349 |
tms - tone mapping structure pointer. |
| 350 |
ls - returned encoded luminance values. |
| 351 |
cs - returned encoded chrominance values (Note 2). |
| 352 |
scan - input scanline. |
| 353 |
len - scanline length. |
| 354 |
gv - input gamma value. |
| 355 |
|
| 356 |
returns - 0 on success, TM_E_* on error. |
| 357 |
*/ |
| 358 |
|
| 359 |
extern int |
| 360 |
tmCvGray16(TMstruct *tms, TMbright *ls, uint16 *scan, int len, double gv); |
| 361 |
/* |
| 362 |
Convert 16-bit gray scanline to encoded luminance. |
| 363 |
|
| 364 |
tms - tone mapping structure pointer. |
| 365 |
ls - returned encoded luminance values. |
| 366 |
scan - input scanline. |
| 367 |
len - scanline length. |
| 368 |
gv - input gamma value. |
| 369 |
|
| 370 |
returns - 0 on success, TM_E_* on error. |
| 371 |
*/ |
| 372 |
|
| 373 |
/**** Notes ****/ |
| 374 |
/* |
| 375 |
General: |
| 376 |
|
| 377 |
The usual sequence after calling tmInit() is to convert some |
| 378 |
pixel values to chroma and luminance encodings, which can |
| 379 |
be passed to tmAddHisto() to put into the tone mapping histogram. |
| 380 |
This histogram is then used along with the display parameters |
| 381 |
by tmComputeMapping() to compute the luminance mapping function. |
| 382 |
(Colors are tone-mapped as they are converted if TM_F_MESOPIC |
| 383 |
is set.) The encoded chroma and luminance values may then be |
| 384 |
passed to tmMapPixels() to apply the computed tone mapping in |
| 385 |
a second pass. |
| 386 |
|
| 387 |
Especially for RGBE colors in the same color space as the |
| 388 |
target display, the conversion to chroma and luminance values |
| 389 |
is fast enough that it may be recomputed on the second pass |
| 390 |
if memory is at a premium. (Since the chroma values are only |
| 391 |
used during final mapping, setting the cs parameter to TM_NOCHROM |
| 392 |
on the first pass will save time.) Another memory saving option |
| 393 |
if third and subsequent passes are not needed is to use the |
| 394 |
same array to store the mapped pixels as used to store |
| 395 |
the encoded chroma values. This way, only two extra bytes |
| 396 |
for storing encoded luminances are required per pixel. This |
| 397 |
is the method employed by tmMapPicture(), for example. |
| 398 |
*/ |
| 399 |
/* |
| 400 |
Note 1: |
| 401 |
|
| 402 |
All RGBPRIMP values should be pointers to static structures. |
| 403 |
I.e., the same pointer should be used for the same primaries, |
| 404 |
and those primaries should not change from one call to the next. |
| 405 |
This is because the routines use the pointer value to identify |
| 406 |
computed conversion matrices, so the matrices do not have to be |
| 407 |
rebuilt each time. If you are using the standard primaries, |
| 408 |
use the standard primary pointer, stdprims. |
| 409 |
|
| 410 |
To indicate a set of input primaries are actually CIE XYZ, |
| 411 |
the TM_XYZPRIM macro may be passed. If the input primaries |
| 412 |
are unknown, it is wisest to pass tmTop->monpri to tmSetSpace(). |
| 413 |
By default, the input primaries equal the monitor primaries |
| 414 |
and the scalefactor is set to WHTEFFICACY in tmInit(). |
| 415 |
*/ |
| 416 |
/* |
| 417 |
Note 2: |
| 418 |
|
| 419 |
Chrominance is optional in most of these routines, whether |
| 420 |
TM_F_BW is set or not. Passing a value of TM_NOCHROM (or |
| 421 |
TM_NOCHROMP for picture reading) indicates that returned |
| 422 |
color values are not desired. |
| 423 |
|
| 424 |
If TM_NOCHROM is passed to a mapping routine expecting chroma |
| 425 |
input, it will do without it and return luminance channel |
| 426 |
rather than RGB pixel values. Otherwise, the array for |
| 427 |
returned pixel values may be the same array used to pass |
| 428 |
encoded chrominances if no other mappings are desired. |
| 429 |
*/ |
| 430 |
/* |
| 431 |
Note 3: |
| 432 |
|
| 433 |
Picture files may either be opened by the calling routine or by |
| 434 |
the library function. If opened by the calling routine, the |
| 435 |
pointer to the stream is passed, which may be a pipe or other |
| 436 |
non-seekable input as it is only read once. It must be |
| 437 |
positioned at the beginning when the function is called, and it |
| 438 |
will be positioned at the end on return. It will not be closed. |
| 439 |
If the passed stream pointer is TM_GETFILE, then the library |
| 440 |
function will open the file, read its contents and close it |
| 441 |
before returning, whether or not an error was encountered. |
| 442 |
*/ |
| 443 |
|
| 444 |
#ifdef __cplusplus |
| 445 |
} |
| 446 |
#endif |
| 447 |
#endif /* _RAD_TONEMAP_H_ */ |
| 448 |
|
