| 1 |
/* RCSid $Id: tonemap.h,v 3.14 2003/06/27 06:53:22 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 |
#ifdef __cplusplus |
| 10 |
extern "C" { |
| 11 |
#endif |
| 12 |
|
| 13 |
#include "tifftypes.h" |
| 14 |
|
| 15 |
/**** Argument Macros ****/ |
| 16 |
/* Flags of what to do */ |
| 17 |
#define TM_F_HCONTR 01 /* human contrast sensitivity */ |
| 18 |
#define TM_F_MESOPIC 02 /* mesopic color sensitivity */ |
| 19 |
#define TM_F_LINEAR 04 /* linear brightness mapping */ |
| 20 |
#define TM_F_ACUITY 010 /* acuity adjustment */ |
| 21 |
#define TM_F_VEIL 020 /* veiling glare */ |
| 22 |
#define TM_F_CWEIGHT 040 /* center weighting */ |
| 23 |
#define TM_F_FOVEAL 0100 /* use foveal sample size */ |
| 24 |
#define TM_F_BW 0200 /* luminance only */ |
| 25 |
#define TM_F_NOSTDERR 0400 /* don't report errors to stderr */ |
| 26 |
/* combined modes */ |
| 27 |
#define TM_F_CAMERA 0 |
| 28 |
#define TM_F_HUMAN (TM_F_HCONTR|TM_F_MESOPIC|TM_F_VEIL|\ |
| 29 |
TM_F_ACUITY|TM_F_FOVEAL) |
| 30 |
#define TM_F_UNIMPL (TM_F_CWEIGHT|TM_F_VEIL|TM_F_ACUITY|TM_F_FOVEAL) |
| 31 |
|
| 32 |
/* special pointer values */ |
| 33 |
#define TM_XYZPRIM (RGBPRIMP)NULL /* indicate XYZ primaries (Note 1) */ |
| 34 |
#define TM_NOCHROM (BYTE *)NULL /* indicate no chrominance */ |
| 35 |
#define TM_NOCHROMP (BYTE **)NULL /* indicate no chrominances */ |
| 36 |
#define TM_GETFILE (FILE *)NULL /* indicate file must be opened */ |
| 37 |
|
| 38 |
|
| 39 |
/**** Error Return Values ****/ |
| 40 |
|
| 41 |
#define TM_E_OK 0 /* normal return status */ |
| 42 |
#define TM_E_NOMEM 1 /* out of memory */ |
| 43 |
#define TM_E_ILLEGAL 2 /* illegal argument value */ |
| 44 |
#define TM_E_TMINVAL 3 /* no valid tone mapping */ |
| 45 |
#define TM_E_TMFAIL 4 /* cannot compute tone mapping */ |
| 46 |
#define TM_E_BADFILE 5 /* cannot open or understand file */ |
| 47 |
#define TM_E_CODERR1 6 /* code consistency error 1 */ |
| 48 |
#define TM_E_CODERR2 7 /* code consistency error 2 */ |
| 49 |
|
| 50 |
|
| 51 |
/**** Conversion Constants and Table Sizes ****/ |
| 52 |
|
| 53 |
#define TM_BRTSCALE 128 /* brightness scale factor (integer) */ |
| 54 |
|
| 55 |
#define TM_NOBRT (-1<<15) /* bogus brightness value */ |
| 56 |
#define TM_NOLUM (1e-17) /* ridiculously small luminance */ |
| 57 |
|
| 58 |
#define TM_MAXPKG 8 /* maximum number of color formats */ |
| 59 |
|
| 60 |
|
| 61 |
/**** Global Data Types and Structures ****/ |
| 62 |
|
| 63 |
#ifndef MEM_PTR |
| 64 |
#define MEM_PTR void * |
| 65 |
#endif |
| 66 |
|
| 67 |
extern char *tmErrorMessage[]; /* error messages */ |
| 68 |
extern int tmLastError; /* last error incurred by library */ |
| 69 |
extern char *tmLastFunction; /* error-generating function name */ |
| 70 |
|
| 71 |
typedef short TMbright; /* encoded luminance type */ |
| 72 |
|
| 73 |
/* basic tone mapping data structure */ |
| 74 |
extern struct tmStruct { |
| 75 |
int flags; /* flags of what to do */ |
| 76 |
RGBPRIMP monpri; /* monitor RGB primaries */ |
| 77 |
double mongam; /* monitor gamma value (approx.) */ |
| 78 |
COLOR clf; /* computed luminance coefficients */ |
| 79 |
int cdiv[3]; /* computed color divisors */ |
| 80 |
RGBPRIMP inppri; /* current input primaries */ |
| 81 |
double inpsf; /* current input scalefactor */ |
| 82 |
COLORMAT cmat; /* color conversion matrix */ |
| 83 |
TMbright hbrmin, hbrmax; /* histogram brightness limits */ |
| 84 |
int *histo; /* input histogram */ |
| 85 |
TMbright mbrmin, mbrmax; /* mapped brightness limits */ |
| 86 |
unsigned short *lumap; /* computed luminance map */ |
| 87 |
struct tmStruct *tmprev; /* previous tone mapping */ |
| 88 |
MEM_PTR pd[TM_MAXPKG]; /* pointers to private data */ |
| 89 |
} *tmTop; /* current tone mapping stack */ |
| 90 |
|
| 91 |
/* conversion package functions */ |
| 92 |
struct tmPackage { |
| 93 |
MEM_PTR (*Init)(struct tmStruct *tms); |
| 94 |
void (*NewSpace)(struct tmStruct *tms); |
| 95 |
void (*Free)(MEM_PTR pp); |
| 96 |
}; |
| 97 |
/* our list of conversion packages */ |
| 98 |
extern struct tmPackage *tmPkg[TM_MAXPKG]; |
| 99 |
extern int tmNumPkgs; /* number of registered packages */ |
| 100 |
|
| 101 |
|
| 102 |
/**** Useful Macros ****/ |
| 103 |
|
| 104 |
/* compute luminance from encoded value */ |
| 105 |
#define tmLuminance(li) exp((li)*(1./TM_BRTSCALE)) |
| 106 |
|
| 107 |
/* does tone mapping need color matrix? */ |
| 108 |
#define tmNeedMatrix(t) ((t)->monpri != (t)->inppri) |
| 109 |
|
| 110 |
/* register a conversion package */ |
| 111 |
#define tmRegPkg(pf) ( tmNumPkgs >= TM_MAXPKG ? -1 : \ |
| 112 |
(tmPkg[tmNumPkgs] = (pf), tmNumPkgs++) ) |
| 113 |
|
| 114 |
/* get the specific package's data */ |
| 115 |
#define tmPkgData(t,i) ((t)->pd[i]!=NULL ? (t)->pd[i] : (*tmPkg[i]->Init)(t)) |
| 116 |
|
| 117 |
|
| 118 |
/**** Library Function Calls ****/ |
| 119 |
|
| 120 |
|
| 121 |
extern struct tmStruct * |
| 122 |
tmInit(int flags, RGBPRIMP monpri, double gamval); |
| 123 |
/* |
| 124 |
Initialize new tone mapping and push it onto stack. |
| 125 |
|
| 126 |
flags - TM_F_* flags indicating what is to be done. |
| 127 |
monpri - display monitor primaries (Note 1). |
| 128 |
gamval - display gamma response (can be approximate). |
| 129 |
|
| 130 |
returns - new tmTop, or NULL if insufficient memory. |
| 131 |
*/ |
| 132 |
|
| 133 |
extern int |
| 134 |
tmSetSpace(RGBPRIMP pri, double sf); |
| 135 |
/* |
| 136 |
Set color primaries and scale factor for incoming scanlines. |
| 137 |
|
| 138 |
pri - RGB color input primaries (Note 1). |
| 139 |
sf - scale factor to get to luminance in cd/m^2. |
| 140 |
|
| 141 |
returns - 0 on success, TM_E_* code on failure. |
| 142 |
*/ |
| 143 |
|
| 144 |
extern void |
| 145 |
tmClearHisto(void); |
| 146 |
/* |
| 147 |
Clear histogram for current tone mapping. |
| 148 |
*/ |
| 149 |
|
| 150 |
extern int |
| 151 |
tmAddHisto(TMbright *ls, int len, int wt); |
| 152 |
/* |
| 153 |
Add brightness values to current histogram. |
| 154 |
|
| 155 |
ls - encoded luminance values. |
| 156 |
len - number of luminance values. |
| 157 |
wt - integer weight to use for each value (usually 1 or -1). |
| 158 |
|
| 159 |
returns - 0 on success, TM_E_* on error. |
| 160 |
*/ |
| 161 |
|
| 162 |
extern int |
| 163 |
tmFixedMapping(double expmult, double gamval); |
| 164 |
/* |
| 165 |
Assign a fixed, linear tone-mapping using the given multiplier, |
| 166 |
which is the ratio of maximum output to uncalibrated input. |
| 167 |
This mapping will be used in subsequent calls to tmMapPixels() |
| 168 |
until a new tone mapping is computed. |
| 169 |
Only the min. and max. values are used from the histogram. |
| 170 |
|
| 171 |
expmult - the fixed exposure multiplier to use. |
| 172 |
gamval - display gamma response (0. for default). |
| 173 |
returns - 0 on success, TM_E_* on error. |
| 174 |
*/ |
| 175 |
|
| 176 |
extern int |
| 177 |
tmComputeMapping(double gamval, double Lddyn, double Ldmax); |
| 178 |
/* |
| 179 |
Compute tone mapping function from the current histogram. |
| 180 |
This mapping will be used in subsequent calls to tmMapPixels() |
| 181 |
until a new tone mapping is computed. |
| 182 |
I.e., calls to tmAddHisto() have no immediate effect. |
| 183 |
|
| 184 |
gamval - display gamma response (0. for default). |
| 185 |
Lddyn - the display's dynamic range (0. for default). |
| 186 |
Ldmax - maximum display luminance in cd/m^2 (0. for default). |
| 187 |
|
| 188 |
returns - 0 on success, TM_E_* on failure. |
| 189 |
*/ |
| 190 |
|
| 191 |
extern int |
| 192 |
tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len); |
| 193 |
/* |
| 194 |
Apply tone mapping function to pixel values. |
| 195 |
|
| 196 |
ps - returned pixel values (Note 2). |
| 197 |
ls - encoded luminance values. |
| 198 |
cs - encoded chrominance values (Note 2). |
| 199 |
len - number of pixels. |
| 200 |
|
| 201 |
returns - 0 on success, TM_E_* on failure. |
| 202 |
*/ |
| 203 |
|
| 204 |
extern struct tmStruct * |
| 205 |
tmPop(void); |
| 206 |
/* |
| 207 |
Pops current tone mapping from stack. |
| 208 |
|
| 209 |
returns - pointer to tone mapping structure, or NULL if none. |
| 210 |
*/ |
| 211 |
|
| 212 |
extern int |
| 213 |
tmPull(struct tmStruct *tms); |
| 214 |
/* |
| 215 |
Pull tone mapping from anywhere in stack. |
| 216 |
|
| 217 |
tms - tone mapping structure to find. |
| 218 |
|
| 219 |
returns - 1 if found in stack, 0 otherwise. |
| 220 |
*/ |
| 221 |
|
| 222 |
extern int |
| 223 |
tmPush(struct tmStruct *tms); |
| 224 |
/* |
| 225 |
Make tone mapping active by (pulling it and) pushing it to the top. |
| 226 |
|
| 227 |
tms - initialized tone mapping structure. |
| 228 |
|
| 229 |
returns - 0 on success, TM_E_* if tms is invalid. |
| 230 |
*/ |
| 231 |
|
| 232 |
extern struct tmStruct * |
| 233 |
tmDup(void); |
| 234 |
/* |
| 235 |
Duplicate the current tone mapping into a new structure on the stack. |
| 236 |
|
| 237 |
returns - pointer to new top, or NULL on error. |
| 238 |
*/ |
| 239 |
|
| 240 |
extern void |
| 241 |
tmDone(struct tmStruct *tms); |
| 242 |
/* |
| 243 |
Free data associated with the given tone mapping structure. |
| 244 |
Calls tmPull() first to remove it from the stack if present. |
| 245 |
The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL) |
| 246 |
all have the same effect, which is to remove and free |
| 247 |
the current tone mapping. |
| 248 |
|
| 249 |
tms - tone mapping structure to free. |
| 250 |
*/ |
| 251 |
|
| 252 |
extern int |
| 253 |
tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len); |
| 254 |
/* |
| 255 |
Convert RGB/XYZ float scanline to encoded luminance and chrominance. |
| 256 |
|
| 257 |
ls - returned encoded luminance values. |
| 258 |
cs - returned encoded chrominance values (Note 2). |
| 259 |
scan - input scanline. |
| 260 |
len - scanline length. |
| 261 |
|
| 262 |
returns - 0 on success, TM_E_* on error. |
| 263 |
*/ |
| 264 |
|
| 265 |
extern int |
| 266 |
tmCvGrays(TMbright *ls, float *scan, int len); |
| 267 |
/* |
| 268 |
Convert gray float scanline to encoded luminance. |
| 269 |
|
| 270 |
ls - returned encoded luminance values. |
| 271 |
scan - input scanline. |
| 272 |
len - scanline length. |
| 273 |
|
| 274 |
returns - 0 on success, TM_E_* on error. |
| 275 |
*/ |
| 276 |
|
| 277 |
extern int |
| 278 |
tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len); |
| 279 |
/* |
| 280 |
Convert RGBE/XYZE scanline to encoded luminance and chrominance. |
| 281 |
|
| 282 |
ls - returned encoded luminance values. |
| 283 |
cs - returned encoded chrominance values (Note 2). |
| 284 |
scan - input scanline. |
| 285 |
len - scanline length. |
| 286 |
|
| 287 |
returns - 0 on success, TM_E_* on error. |
| 288 |
*/ |
| 289 |
|
| 290 |
extern int |
| 291 |
tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp, |
| 292 |
char *fname, FILE *fp); |
| 293 |
/* |
| 294 |
Load Radiance picture and convert to tone mapping representation. |
| 295 |
Memory for the luminance and chroma arrays is allocated using |
| 296 |
malloc(3), and should be freed with free(3) when no longer needed. |
| 297 |
Calls tmSetSpace() to calibrate input color space. |
| 298 |
|
| 299 |
lpp - returned array of encoded luminances, picture ordering. |
| 300 |
cpp - returned array of encoded chrominances (Note 2). |
| 301 |
xp, yp - returned picture dimensions. |
| 302 |
fname - picture file name. |
| 303 |
fp - pointer to open file (Note 3). |
| 304 |
|
| 305 |
returns - 0 on success, TM_E_* on failure. |
| 306 |
*/ |
| 307 |
|
| 308 |
extern int |
| 309 |
tmMapPicture(BYTE **psp, int *xp, int *yp, int flags, |
| 310 |
RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax, |
| 311 |
char *fname, FILE *fp); |
| 312 |
/* |
| 313 |
Load and apply tone mapping to Radiance picture. |
| 314 |
Stack is restored to its original state upon return. |
| 315 |
If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture() |
| 316 |
calls pcond to perform the actual conversion, which takes |
| 317 |
longer but gives access to all the TM_F_* features. |
| 318 |
Memory for the final pixel array is allocated using malloc(3), |
| 319 |
and should be freed with free(3) when it is no longer needed. |
| 320 |
|
| 321 |
psp - returned array of tone mapped pixels, picture ordering. |
| 322 |
xp, yp - returned picture dimensions. |
| 323 |
flags - TM_F_* flags indicating what is to be done. |
| 324 |
monpri - display monitor primaries (Note 1). |
| 325 |
gamval - display gamma response. |
| 326 |
Lddyn - the display's dynamic range (0. for default). |
| 327 |
Ldmax - maximum display luminance in cd/m^2 (0. for default). |
| 328 |
fname - picture file name. |
| 329 |
fp - pointer to open file (Note 3). |
| 330 |
|
| 331 |
returns - 0 on success, TM_E_* on failure. |
| 332 |
*/ |
| 333 |
|
| 334 |
extern int |
| 335 |
tmCvRGB48(TMbright *ls, BYTE *cs, uint16 (*scan)[3], int len, double gv); |
| 336 |
/* |
| 337 |
Convert 48-bit RGB scanline to encoded luminance and chrominance. |
| 338 |
|
| 339 |
ls - returned encoded luminance values. |
| 340 |
cs - returned encoded chrominance values (Note 2). |
| 341 |
scan - input scanline. |
| 342 |
len - scanline length. |
| 343 |
gv - input gamma value. |
| 344 |
|
| 345 |
returns - 0 on success, TM_E_* on error. |
| 346 |
*/ |
| 347 |
|
| 348 |
extern int |
| 349 |
tmCvGray16(TMbright *ls, uint16 *scan, int len, double gv); |
| 350 |
/* |
| 351 |
Convert 16-bit gray scanline to encoded luminance. |
| 352 |
|
| 353 |
ls - returned encoded luminance values. |
| 354 |
scan - input scanline. |
| 355 |
len - scanline length. |
| 356 |
gv - input gamma value. |
| 357 |
|
| 358 |
returns - 0 on success, TM_E_* on error. |
| 359 |
*/ |
| 360 |
|
| 361 |
/**** Notes ****/ |
| 362 |
/* |
| 363 |
General: |
| 364 |
|
| 365 |
The usual sequence after calling tmInit() is to convert some |
| 366 |
pixel values to chroma and luminance encodings, which can |
| 367 |
be passed to tmAddHisto() to put into the tone mapping histogram. |
| 368 |
This histogram is then used along with the display parameters |
| 369 |
by tmComputeMapping() to compute the luminance mapping function. |
| 370 |
(Colors are tone-mapped as they are converted if TM_F_MESOPIC |
| 371 |
is set.) The encoded chroma and luminance values may then be |
| 372 |
passed to tmMapPixels() to apply the computed tone mapping in |
| 373 |
a second pass. |
| 374 |
|
| 375 |
Especially for RGBE colors in the same color space as the |
| 376 |
target display, the conversion to chroma and luminance values |
| 377 |
is fast enough that it may be recomputed on the second pass |
| 378 |
if memory is at a premium. (Since the chroma values are only |
| 379 |
used during final mapping, setting the cs parameter to TM_NOCHROM |
| 380 |
on the first pass will save time.) Another memory saving option |
| 381 |
if third and subsequent passes are not needed is to use the |
| 382 |
same array to store the mapped pixels as used to store |
| 383 |
the encoded chroma values. This way, only two extra bytes |
| 384 |
for storing encoded luminances are required per pixel. This |
| 385 |
is the method employed by tmMapPicture(), for example. |
| 386 |
*/ |
| 387 |
/* |
| 388 |
Note 1: |
| 389 |
|
| 390 |
All RGBPRIMP values should be pointers to static structures. |
| 391 |
I.e., the same pointer should be used for the same primaries, |
| 392 |
and those primaries should not change from one call to the next. |
| 393 |
This is because the routines use the pointer value to identify |
| 394 |
computed conversion matrices, so the matrices do not have to be |
| 395 |
rebuilt each time. If you are using the standard primaries, |
| 396 |
use the standard primary pointer, stdprims. |
| 397 |
|
| 398 |
To indicate a set of input primaries are actually CIE XYZ, |
| 399 |
the TM_XYZPRIM macro may be passed. If the input primaries |
| 400 |
are unknown, it is wisest to pass tmTop->monpri to tmSetSpace(). |
| 401 |
By default, the input primaries equal the monitor primaries |
| 402 |
and the scalefactor is set to WHTEFFICACY in tmInit(). |
| 403 |
*/ |
| 404 |
/* |
| 405 |
Note 2: |
| 406 |
|
| 407 |
Chrominance is optional in most of these routines, whether |
| 408 |
TM_F_BW is set or not. Passing a value of TM_NOCHROM (or |
| 409 |
TM_NOCHROMP for picture reading) indicates that returned |
| 410 |
color values are not desired. |
| 411 |
|
| 412 |
If TM_NOCHROM is passed to a mapping routine expecting chroma |
| 413 |
input, it will do without it and return luminance channel |
| 414 |
rather than RGB pixel values. Otherwise, the array for |
| 415 |
returned pixel values may be the same array used to pass |
| 416 |
encoded chrominances if no other mappings are desired. |
| 417 |
*/ |
| 418 |
/* |
| 419 |
Note 3: |
| 420 |
|
| 421 |
Picture files may either be opened by the calling routine or by |
| 422 |
the library function. If opened by the calling routine, the |
| 423 |
pointer to the stream is passed, which may be a pipe or other |
| 424 |
non-seekable input as it is only read once. It must be |
| 425 |
positioned at the beginning when the function is called, and it |
| 426 |
will be positioned at the end on return. It will not be closed. |
| 427 |
If the passed stream pointer is TM_GETFILE, then the library |
| 428 |
function will open the file, read its contents and close it |
| 429 |
before returning, whether or not an error was encountered. |
| 430 |
*/ |
| 431 |
|
| 432 |
#ifdef __cplusplus |
| 433 |
} |
| 434 |
#endif |
| 435 |
#endif /* _RAD_TONEMAP_H_ */ |
| 436 |
|
