| 1 |
greg |
3.11 |
/* RCSid: $Id$ */
|
| 2 |
greg |
3.1 |
/*
|
| 3 |
|
|
* Header file for tone mapping functions.
|
| 4 |
gwlarson |
3.8 |
*
|
| 5 |
|
|
* Include after "color.h"
|
| 6 |
greg |
3.1 |
*/
|
| 7 |
|
|
|
| 8 |
greg |
3.11 |
/* ====================================================================
|
| 9 |
|
|
* The Radiance Software License, Version 1.0
|
| 10 |
|
|
*
|
| 11 |
|
|
* Copyright (c) 1990 - 2002 The Regents of the University of California,
|
| 12 |
|
|
* through Lawrence Berkeley National Laboratory. All rights reserved.
|
| 13 |
|
|
*
|
| 14 |
|
|
* Redistribution and use in source and binary forms, with or without
|
| 15 |
|
|
* modification, are permitted provided that the following conditions
|
| 16 |
|
|
* are met:
|
| 17 |
|
|
*
|
| 18 |
|
|
* 1. Redistributions of source code must retain the above copyright
|
| 19 |
|
|
* notice, this list of conditions and the following disclaimer.
|
| 20 |
|
|
*
|
| 21 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
| 22 |
|
|
* notice, this list of conditions and the following disclaimer in
|
| 23 |
|
|
* the documentation and/or other materials provided with the
|
| 24 |
|
|
* distribution.
|
| 25 |
|
|
*
|
| 26 |
|
|
* 3. The end-user documentation included with the redistribution,
|
| 27 |
|
|
* if any, must include the following acknowledgment:
|
| 28 |
|
|
* "This product includes Radiance software
|
| 29 |
|
|
* (http://radsite.lbl.gov/)
|
| 30 |
|
|
* developed by the Lawrence Berkeley National Laboratory
|
| 31 |
|
|
* (http://www.lbl.gov/)."
|
| 32 |
|
|
* Alternately, this acknowledgment may appear in the software itself,
|
| 33 |
|
|
* if and wherever such third-party acknowledgments normally appear.
|
| 34 |
|
|
*
|
| 35 |
|
|
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
|
| 36 |
|
|
* and "The Regents of the University of California" must
|
| 37 |
|
|
* not be used to endorse or promote products derived from this
|
| 38 |
|
|
* software without prior written permission. For written
|
| 39 |
|
|
* permission, please contact [email protected].
|
| 40 |
|
|
*
|
| 41 |
|
|
* 5. Products derived from this software may not be called "Radiance",
|
| 42 |
|
|
* nor may "Radiance" appear in their name, without prior written
|
| 43 |
|
|
* permission of Lawrence Berkeley National Laboratory.
|
| 44 |
|
|
*
|
| 45 |
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
|
| 46 |
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
| 47 |
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
| 48 |
|
|
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
|
| 49 |
|
|
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
| 50 |
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
| 51 |
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
| 52 |
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
| 53 |
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
| 54 |
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
| 55 |
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
| 56 |
|
|
* SUCH DAMAGE.
|
| 57 |
|
|
* ====================================================================
|
| 58 |
|
|
*
|
| 59 |
|
|
* This software consists of voluntary contributions made by many
|
| 60 |
|
|
* individuals on behalf of Lawrence Berkeley National Laboratory. For more
|
| 61 |
|
|
* information on Lawrence Berkeley National Laboratory, please see
|
| 62 |
|
|
* <http://www.lbl.gov/>.
|
| 63 |
|
|
*/
|
| 64 |
|
|
|
| 65 |
|
|
#ifdef __cplusplus
|
| 66 |
|
|
extern "C" {
|
| 67 |
|
|
#endif
|
| 68 |
greg |
3.4 |
|
| 69 |
greg |
3.1 |
/**** Argument Macros ****/
|
| 70 |
|
|
/* Flags of what to do */
|
| 71 |
|
|
#define TM_F_HCONTR 01 /* human contrast sensitivity */
|
| 72 |
|
|
#define TM_F_MESOPIC 02 /* mesopic color sensitivity */
|
| 73 |
|
|
#define TM_F_LINEAR 04 /* linear brightness mapping */
|
| 74 |
|
|
#define TM_F_ACUITY 010 /* acuity adjustment */
|
| 75 |
|
|
#define TM_F_VEIL 020 /* veiling glare */
|
| 76 |
|
|
#define TM_F_CWEIGHT 040 /* center weighting */
|
| 77 |
|
|
#define TM_F_FOVEAL 0100 /* use foveal sample size */
|
| 78 |
|
|
#define TM_F_BW 0200 /* luminance only */
|
| 79 |
greg |
3.2 |
#define TM_F_NOSTDERR 0400 /* don't report errors to stderr */
|
| 80 |
greg |
3.1 |
/* combined modes */
|
| 81 |
|
|
#define TM_F_CAMERA 0
|
| 82 |
|
|
#define TM_F_HUMAN (TM_F_HCONTR|TM_F_MESOPIC|TM_F_VEIL|\
|
| 83 |
|
|
TM_F_ACUITY|TM_F_FOVEAL)
|
| 84 |
|
|
#define TM_F_UNIMPL (TM_F_CWEIGHT|TM_F_VEIL|TM_F_ACUITY|TM_F_FOVEAL)
|
| 85 |
|
|
|
| 86 |
|
|
/* special pointer values */
|
| 87 |
|
|
#define TM_XYZPRIM (RGBPRIMP)NULL /* indicate XYZ primaries (Note 1) */
|
| 88 |
|
|
#define TM_NOCHROM (BYTE *)NULL /* indicate no chrominance */
|
| 89 |
|
|
#define TM_NOCHROMP (BYTE **)NULL /* indicate no chrominances */
|
| 90 |
|
|
#define TM_GETFILE (FILE *)NULL /* indicate file must be opened */
|
| 91 |
gwlarson |
3.8 |
|
| 92 |
greg |
3.1 |
|
| 93 |
|
|
/**** Error Return Values ****/
|
| 94 |
|
|
|
| 95 |
|
|
#define TM_E_OK 0 /* normal return status */
|
| 96 |
|
|
#define TM_E_NOMEM 1 /* out of memory */
|
| 97 |
|
|
#define TM_E_ILLEGAL 2 /* illegal argument value */
|
| 98 |
|
|
#define TM_E_TMINVAL 3 /* no valid tone mapping */
|
| 99 |
|
|
#define TM_E_TMFAIL 4 /* cannot compute tone mapping */
|
| 100 |
|
|
#define TM_E_BADFILE 5 /* cannot open or understand file */
|
| 101 |
greg |
3.4 |
#define TM_E_CODERR1 6 /* code consistency error 1 */
|
| 102 |
|
|
#define TM_E_CODERR2 7 /* code consistency error 2 */
|
| 103 |
greg |
3.1 |
|
| 104 |
greg |
3.4 |
|
| 105 |
greg |
3.1 |
/**** Conversion Constants and Table Sizes ****/
|
| 106 |
|
|
|
| 107 |
|
|
#define TM_BRTSCALE 128 /* brightness scale factor (integer) */
|
| 108 |
|
|
|
| 109 |
gwlarson |
3.10 |
#define TM_NOBRT (-1<<15) /* bogus brightness value */
|
| 110 |
greg |
3.11 |
#define TM_NOLUM (1e-17) /* ridiculously small luminance */
|
| 111 |
gwlarson |
3.10 |
|
| 112 |
greg |
3.4 |
#define TM_MAXPKG 8 /* maximum number of color formats */
|
| 113 |
greg |
3.1 |
|
| 114 |
|
|
|
| 115 |
greg |
3.4 |
/**** Global Data Types and Structures ****/
|
| 116 |
|
|
|
| 117 |
|
|
#ifndef MEM_PTR
|
| 118 |
|
|
#define MEM_PTR void *
|
| 119 |
|
|
#endif
|
| 120 |
|
|
|
| 121 |
greg |
3.1 |
extern char *tmErrorMessage[]; /* error messages */
|
| 122 |
gregl |
3.6 |
extern int tmLastError; /* last error incurred by library */
|
| 123 |
|
|
extern char *tmLastFunction; /* error-generating function name */
|
| 124 |
greg |
3.1 |
|
| 125 |
|
|
typedef short TMbright; /* encoded luminance type */
|
| 126 |
|
|
|
| 127 |
|
|
/* basic tone mapping data structure */
|
| 128 |
|
|
extern struct tmStruct {
|
| 129 |
|
|
int flags; /* flags of what to do */
|
| 130 |
|
|
RGBPRIMP monpri; /* monitor RGB primaries */
|
| 131 |
|
|
double mongam; /* monitor gamma value (approx.) */
|
| 132 |
|
|
COLOR clf; /* computed luminance coefficients */
|
| 133 |
greg |
3.4 |
int cdiv[3]; /* computed color divisors */
|
| 134 |
greg |
3.1 |
RGBPRIMP inppri; /* current input primaries */
|
| 135 |
|
|
double inpsf; /* current input scalefactor */
|
| 136 |
|
|
COLORMAT cmat; /* color conversion matrix */
|
| 137 |
gregl |
3.7 |
TMbright hbrmin, hbrmax; /* histogram brightness limits */
|
| 138 |
greg |
3.1 |
int *histo; /* input histogram */
|
| 139 |
gregl |
3.7 |
TMbright mbrmin, mbrmax; /* mapped brightness limits */
|
| 140 |
greg |
3.1 |
unsigned short *lumap; /* computed luminance map */
|
| 141 |
|
|
struct tmStruct *tmprev; /* previous tone mapping */
|
| 142 |
greg |
3.4 |
MEM_PTR pd[TM_MAXPKG]; /* pointers to private data */
|
| 143 |
greg |
3.1 |
} *tmTop; /* current tone mapping stack */
|
| 144 |
greg |
3.4 |
|
| 145 |
|
|
/* conversion package functions */
|
| 146 |
|
|
#ifdef NOPROTO
|
| 147 |
|
|
struct tmPackage {
|
| 148 |
|
|
MEM_PTR (*Init)(); /* initialize private data */
|
| 149 |
|
|
void (*NewSpace)(); /* new input color space (optional) */
|
| 150 |
|
|
void (*Free)(); /* free private data */
|
| 151 |
|
|
};
|
| 152 |
|
|
#else
|
| 153 |
|
|
struct tmPackage {
|
| 154 |
|
|
MEM_PTR (*Init)(struct tmStruct *tms);
|
| 155 |
greg |
3.11 |
void (*NewSpace)(struct tmStruct *tms);
|
| 156 |
greg |
3.4 |
void (*Free)(MEM_PTR pp);
|
| 157 |
|
|
};
|
| 158 |
|
|
#endif
|
| 159 |
|
|
/* our list of conversion packages */
|
| 160 |
|
|
extern struct tmPackage *tmPkg[TM_MAXPKG];
|
| 161 |
|
|
extern int tmNumPkgs; /* number of registered packages */
|
| 162 |
|
|
|
| 163 |
|
|
|
| 164 |
greg |
3.1 |
/**** Useful Macros ****/
|
| 165 |
|
|
|
| 166 |
greg |
3.4 |
/* compute luminance from encoded value */
|
| 167 |
greg |
3.11 |
#define tmLuminance(li) exp((li)*(1./TM_BRTSCALE))
|
| 168 |
greg |
3.1 |
|
| 169 |
greg |
3.4 |
/* does tone mapping need color matrix? */
|
| 170 |
|
|
#define tmNeedMatrix(t) ((t)->monpri != (t)->inppri)
|
| 171 |
|
|
|
| 172 |
|
|
/* register a conversion package */
|
| 173 |
|
|
#define tmRegPkg(pf) ( tmNumPkgs >= TM_MAXPKG ? -1 : \
|
| 174 |
|
|
(tmPkg[tmNumPkgs] = (pf), tmNumPkgs++) )
|
| 175 |
|
|
|
| 176 |
|
|
/* get the specific package's data */
|
| 177 |
|
|
#define tmPkgData(t,i) ((t)->pd[i]!=NULL ? (t)->pd[i] : (*tmPkg[i]->Init)(t))
|
| 178 |
|
|
|
| 179 |
|
|
|
| 180 |
greg |
3.1 |
/**** Library Function Calls ****/
|
| 181 |
|
|
|
| 182 |
greg |
3.4 |
#ifdef NOPROTO
|
| 183 |
greg |
3.1 |
|
| 184 |
greg |
3.3 |
extern struct tmStruct *tmInit(), *tmPop(), *tmDup();
|
| 185 |
greg |
3.11 |
extern int tmSetSpace(), tmPull(), tmPush();
|
| 186 |
greg |
3.1 |
extern void tmClearHisto(), tmDone();
|
| 187 |
greg |
3.11 |
extern int tmAddHisto();
|
| 188 |
|
|
extern int tmFixedMapping(), tmComputeMapping(), tmMapPixels();
|
| 189 |
|
|
extern int tmCvColors(), tmCvGrays(), tmCvColrs();
|
| 190 |
|
|
extern int tmLoadPicture(), tmMapPicture();
|
| 191 |
greg |
3.1 |
|
| 192 |
|
|
#else
|
| 193 |
|
|
|
| 194 |
|
|
extern struct tmStruct *
|
| 195 |
|
|
tmInit(int flags, RGBPRIMP monpri, double gamval);
|
| 196 |
|
|
/*
|
| 197 |
|
|
Initialize new tone mapping and push it onto stack.
|
| 198 |
|
|
|
| 199 |
|
|
flags - TM_F_* flags indicating what is to be done.
|
| 200 |
|
|
monpri - display monitor primaries (Note 1).
|
| 201 |
|
|
gamval - display gamma response (can be approximate).
|
| 202 |
|
|
|
| 203 |
|
|
returns - new tmTop, or NULL if insufficient memory.
|
| 204 |
|
|
*/
|
| 205 |
|
|
|
| 206 |
|
|
extern int
|
| 207 |
|
|
tmSetSpace(RGBPRIMP pri, double sf);
|
| 208 |
|
|
/*
|
| 209 |
|
|
Set color primaries and scale factor for incoming scanlines.
|
| 210 |
|
|
|
| 211 |
|
|
pri - RGB color input primaries (Note 1).
|
| 212 |
|
|
sf - scale factor to get to luminance in cd/m^2.
|
| 213 |
|
|
|
| 214 |
|
|
returns - 0 on success, TM_E_* code on failure.
|
| 215 |
|
|
*/
|
| 216 |
|
|
|
| 217 |
|
|
extern void
|
| 218 |
|
|
tmClearHisto(void);
|
| 219 |
|
|
/*
|
| 220 |
|
|
Clear histogram for current tone mapping.
|
| 221 |
|
|
*/
|
| 222 |
|
|
|
| 223 |
|
|
extern int
|
| 224 |
|
|
tmAddHisto(TMbright *ls, int len, int wt);
|
| 225 |
|
|
/*
|
| 226 |
|
|
Add brightness values to current histogram.
|
| 227 |
|
|
|
| 228 |
|
|
ls - encoded luminance values.
|
| 229 |
|
|
len - number of luminance values.
|
| 230 |
|
|
wt - integer weight to use for each value (usually 1 or -1).
|
| 231 |
|
|
|
| 232 |
|
|
returns - 0 on success, TM_E_* on error.
|
| 233 |
|
|
*/
|
| 234 |
|
|
|
| 235 |
|
|
extern int
|
| 236 |
greg |
3.11 |
tmFixedMapping(double expmult, double gamval);
|
| 237 |
|
|
/*
|
| 238 |
|
|
Assign a fixed, linear tone-mapping using the given multiplier,
|
| 239 |
|
|
which is the ratio of maximum output to uncalibrated input.
|
| 240 |
|
|
This mapping will be used in subsequent calls to tmMapPixels()
|
| 241 |
|
|
until a new tone mapping is computed.
|
| 242 |
|
|
Only the min. and max. values are used from the histogram.
|
| 243 |
|
|
|
| 244 |
|
|
expmult - the fixed exposure multiplier to use.
|
| 245 |
|
|
gamval - display gamma response (0. for default).
|
| 246 |
|
|
returns - 0 on success, TM_E_* on error.
|
| 247 |
|
|
*/
|
| 248 |
|
|
|
| 249 |
|
|
extern int
|
| 250 |
greg |
3.1 |
tmComputeMapping(double gamval, double Lddyn, double Ldmax);
|
| 251 |
|
|
/*
|
| 252 |
greg |
3.11 |
Compute tone mapping function from the current histogram.
|
| 253 |
|
|
This mapping will be used in subsequent calls to tmMapPixels()
|
| 254 |
|
|
until a new tone mapping is computed.
|
| 255 |
|
|
I.e., calls to tmAddHisto() have no immediate effect.
|
| 256 |
greg |
3.1 |
|
| 257 |
|
|
gamval - display gamma response (0. for default).
|
| 258 |
|
|
Lddyn - the display's dynamic range (0. for default).
|
| 259 |
|
|
Ldmax - maximum display luminance in cd/m^2 (0. for default).
|
| 260 |
|
|
|
| 261 |
|
|
returns - 0 on success, TM_E_* on failure.
|
| 262 |
|
|
*/
|
| 263 |
|
|
|
| 264 |
|
|
extern int
|
| 265 |
|
|
tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len);
|
| 266 |
|
|
/*
|
| 267 |
|
|
Apply tone mapping function to pixel values.
|
| 268 |
|
|
|
| 269 |
|
|
ps - returned pixel values (Note 2).
|
| 270 |
|
|
ls - encoded luminance values.
|
| 271 |
|
|
cs - encoded chrominance values (Note 2).
|
| 272 |
|
|
len - number of pixels.
|
| 273 |
|
|
|
| 274 |
|
|
returns - 0 on success, TM_E_* on failure.
|
| 275 |
|
|
*/
|
| 276 |
|
|
|
| 277 |
|
|
extern struct tmStruct *
|
| 278 |
|
|
tmPop(void);
|
| 279 |
|
|
/*
|
| 280 |
|
|
Pops current tone mapping from stack.
|
| 281 |
|
|
|
| 282 |
|
|
returns - pointer to tone mapping structure, or NULL if none.
|
| 283 |
|
|
*/
|
| 284 |
|
|
|
| 285 |
|
|
extern int
|
| 286 |
|
|
tmPull(struct tmStruct *tms);
|
| 287 |
|
|
/*
|
| 288 |
|
|
Pull tone mapping from anywhere in stack.
|
| 289 |
|
|
|
| 290 |
|
|
tms - tone mapping structure to find.
|
| 291 |
|
|
|
| 292 |
|
|
returns - 1 if found in stack, 0 otherwise.
|
| 293 |
|
|
*/
|
| 294 |
|
|
|
| 295 |
|
|
extern int
|
| 296 |
|
|
tmPush(struct tmStruct *tms);
|
| 297 |
|
|
/*
|
| 298 |
|
|
Make tone mapping active by (pulling it and) pushing it to the top.
|
| 299 |
|
|
|
| 300 |
|
|
tms - initialized tone mapping structure.
|
| 301 |
|
|
|
| 302 |
|
|
returns - 0 on success, TM_E_* if tms is invalid.
|
| 303 |
|
|
*/
|
| 304 |
|
|
|
| 305 |
greg |
3.3 |
extern struct tmStruct *
|
| 306 |
|
|
tmDup(void);
|
| 307 |
|
|
/*
|
| 308 |
|
|
Duplicate the current tone mapping into a new structure on the stack.
|
| 309 |
|
|
|
| 310 |
|
|
returns - pointer to new top, or NULL on error.
|
| 311 |
|
|
*/
|
| 312 |
|
|
|
| 313 |
greg |
3.1 |
extern void
|
| 314 |
|
|
tmDone(struct tmStruct *tms);
|
| 315 |
|
|
/*
|
| 316 |
|
|
Free data associated with the given tone mapping structure.
|
| 317 |
|
|
Calls tmPull() first to remove it from the stack if present.
|
| 318 |
|
|
The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL)
|
| 319 |
|
|
all have the same effect, which is to remove and free
|
| 320 |
|
|
the current tone mapping.
|
| 321 |
|
|
|
| 322 |
|
|
tms - tone mapping structure to free.
|
| 323 |
|
|
*/
|
| 324 |
|
|
|
| 325 |
greg |
3.11 |
extern int
|
| 326 |
|
|
tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len);
|
| 327 |
|
|
/*
|
| 328 |
|
|
Convert RGB/XYZ float scanline to encoded luminance and chrominance.
|
| 329 |
|
|
|
| 330 |
|
|
ls - returned encoded luminance values.
|
| 331 |
|
|
cs - returned encoded chrominance values (Note 2).
|
| 332 |
|
|
scan - input scanline.
|
| 333 |
|
|
len - scanline length.
|
| 334 |
|
|
|
| 335 |
|
|
returns - 0 on success, TM_E_* on error.
|
| 336 |
|
|
*/
|
| 337 |
|
|
|
| 338 |
|
|
extern int
|
| 339 |
|
|
tmCvGrays(TMbright *ls, float *scan, int len);
|
| 340 |
|
|
/*
|
| 341 |
|
|
Convert gray float scanline to encoded luminance.
|
| 342 |
|
|
|
| 343 |
|
|
ls - returned encoded luminance values.
|
| 344 |
|
|
scan - input scanline.
|
| 345 |
|
|
len - scanline length.
|
| 346 |
|
|
|
| 347 |
|
|
returns - 0 on success, TM_E_* on error.
|
| 348 |
|
|
*/
|
| 349 |
|
|
|
| 350 |
|
|
extern int
|
| 351 |
|
|
tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len);
|
| 352 |
|
|
/*
|
| 353 |
|
|
Convert RGBE/XYZE scanline to encoded luminance and chrominance.
|
| 354 |
|
|
|
| 355 |
|
|
ls - returned encoded luminance values.
|
| 356 |
|
|
cs - returned encoded chrominance values (Note 2).
|
| 357 |
|
|
scan - input scanline.
|
| 358 |
|
|
len - scanline length.
|
| 359 |
|
|
|
| 360 |
|
|
returns - 0 on success, TM_E_* on error.
|
| 361 |
|
|
*/
|
| 362 |
|
|
|
| 363 |
|
|
extern int
|
| 364 |
|
|
tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp,
|
| 365 |
|
|
char *fname, FILE *fp);
|
| 366 |
|
|
/*
|
| 367 |
|
|
Load Radiance picture and convert to tone mapping representation.
|
| 368 |
|
|
Memory for the luminance and chroma arrays is allocated using
|
| 369 |
|
|
malloc(3), and should be freed with free(3) when no longer needed.
|
| 370 |
|
|
Calls tmSetSpace() to calibrate input color space.
|
| 371 |
|
|
|
| 372 |
|
|
lpp - returned array of encoded luminances, picture ordering.
|
| 373 |
|
|
cpp - returned array of encoded chrominances (Note 2).
|
| 374 |
|
|
xp, yp - returned picture dimensions.
|
| 375 |
|
|
fname - picture file name.
|
| 376 |
|
|
fp - pointer to open file (Note 3).
|
| 377 |
|
|
|
| 378 |
|
|
returns - 0 on success, TM_E_* on failure.
|
| 379 |
|
|
*/
|
| 380 |
|
|
|
| 381 |
|
|
extern int
|
| 382 |
|
|
tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
|
| 383 |
|
|
RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax,
|
| 384 |
|
|
char *fname, FILE *fp);
|
| 385 |
|
|
/*
|
| 386 |
|
|
Load and apply tone mapping to Radiance picture.
|
| 387 |
|
|
Stack is restored to its original state upon return.
|
| 388 |
|
|
If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture()
|
| 389 |
|
|
calls pcond to perform the actual conversion, which takes
|
| 390 |
|
|
longer but gives access to all the TM_F_* features.
|
| 391 |
|
|
Memory for the final pixel array is allocated using malloc(3),
|
| 392 |
|
|
and should be freed with free(3) when it is no longer needed.
|
| 393 |
|
|
|
| 394 |
|
|
psp - returned array of tone mapped pixels, picture ordering.
|
| 395 |
|
|
xp, yp - returned picture dimensions.
|
| 396 |
|
|
flags - TM_F_* flags indicating what is to be done.
|
| 397 |
|
|
monpri - display monitor primaries (Note 1).
|
| 398 |
|
|
gamval - display gamma response.
|
| 399 |
|
|
Lddyn - the display's dynamic range (0. for default).
|
| 400 |
|
|
Ldmax - maximum display luminance in cd/m^2 (0. for default).
|
| 401 |
|
|
fname - picture file name.
|
| 402 |
|
|
fp - pointer to open file (Note 3).
|
| 403 |
|
|
|
| 404 |
|
|
returns - 0 on success, TM_E_* on failure.
|
| 405 |
|
|
*/
|
| 406 |
|
|
|
| 407 |
greg |
3.1 |
#endif
|
| 408 |
greg |
3.4 |
|
| 409 |
|
|
|
| 410 |
greg |
3.1 |
/**** Notes ****/
|
| 411 |
|
|
/*
|
| 412 |
|
|
General:
|
| 413 |
|
|
|
| 414 |
|
|
The usual sequence after calling tmInit() is to convert some
|
| 415 |
|
|
pixel values to chroma and luminance encodings, which can
|
| 416 |
|
|
be passed to tmAddHisto() to put into the tone mapping histogram.
|
| 417 |
|
|
This histogram is then used along with the display parameters
|
| 418 |
greg |
3.5 |
by tmComputeMapping() to compute the luminance mapping function.
|
| 419 |
greg |
3.1 |
(Colors are tone-mapped as they are converted if TM_F_MESOPIC
|
| 420 |
|
|
is set.) The encoded chroma and luminance values may then be
|
| 421 |
|
|
passed to tmMapPixels() to apply the computed tone mapping in
|
| 422 |
|
|
a second pass.
|
| 423 |
|
|
|
| 424 |
|
|
Especially for RGBE colors in the same color space as the
|
| 425 |
|
|
target display, the conversion to chroma and luminance values
|
| 426 |
|
|
is fast enough that it may be recomputed on the second pass
|
| 427 |
|
|
if memory is at a premium. (Since the chroma values are only
|
| 428 |
|
|
used during final mapping, setting the cs parameter to TM_NOCHROM
|
| 429 |
|
|
on the first pass will save time.) Another memory saving option
|
| 430 |
|
|
if third and subsequent passes are not needed is to use the
|
| 431 |
greg |
3.3 |
same array to store the mapped pixels as used to store
|
| 432 |
greg |
3.1 |
the encoded chroma values. This way, only two extra bytes
|
| 433 |
|
|
for storing encoded luminances are required per pixel. This
|
| 434 |
|
|
is the method employed by tmMapPicture(), for example.
|
| 435 |
|
|
*/
|
| 436 |
|
|
/*
|
| 437 |
|
|
Note 1:
|
| 438 |
|
|
|
| 439 |
|
|
All RGBPRIMP values should be pointers to static structures.
|
| 440 |
|
|
I.e., the same pointer should be used for the same primaries,
|
| 441 |
|
|
and those primaries should not change from one call to the next.
|
| 442 |
|
|
This is because the routines use the pointer value to identify
|
| 443 |
|
|
computed conversion matrices, so the matrices do not have to be
|
| 444 |
|
|
rebuilt each time. If you are using the standard primaries,
|
| 445 |
|
|
use the standard primary pointer, stdprims.
|
| 446 |
|
|
|
| 447 |
|
|
To indicate a set of input primaries are actually CIE XYZ,
|
| 448 |
|
|
the TM_XYZPRIM macro may be passed. If the input primaries
|
| 449 |
|
|
are unknown, it is wisest to pass tmTop->monpri to tmSetSpace().
|
| 450 |
|
|
By default, the input primaries equal the monitor primaries
|
| 451 |
|
|
and the scalefactor is set to WHTEFFICACY in tmInit().
|
| 452 |
|
|
*/
|
| 453 |
|
|
/*
|
| 454 |
|
|
Note 2:
|
| 455 |
|
|
|
| 456 |
|
|
Chrominance is optional in most of these routines, whether
|
| 457 |
|
|
TM_F_BW is set or not. Passing a value of TM_NOCHROM (or
|
| 458 |
|
|
TM_NOCHROMP for picture reading) indicates that returned
|
| 459 |
|
|
color values are not desired.
|
| 460 |
|
|
|
| 461 |
|
|
If TM_NOCHROM is passed to a mapping routine expecting chroma
|
| 462 |
|
|
input, it will do without it and return luminance channel
|
| 463 |
|
|
rather than RGB pixel values. Otherwise, the array for
|
| 464 |
|
|
returned pixel values may be the same array used to pass
|
| 465 |
|
|
encoded chrominances if no other mappings are desired.
|
| 466 |
|
|
*/
|
| 467 |
|
|
/*
|
| 468 |
|
|
Note 3:
|
| 469 |
|
|
|
| 470 |
|
|
Picture files may either be opened by the calling routine or by
|
| 471 |
|
|
the library function. If opened by the calling routine, the
|
| 472 |
|
|
pointer to the stream is passed, which may be a pipe or other
|
| 473 |
|
|
non-seekable input as it is only read once. It must be
|
| 474 |
|
|
positioned at the beginning when the function is called, and it
|
| 475 |
|
|
will be positioned at the end on return. It will not be closed.
|
| 476 |
|
|
If the passed stream pointer is TM_GETFILE, then the library
|
| 477 |
|
|
function will open the file, read its contents and close it
|
| 478 |
|
|
before returning, whether or not an error was encountered.
|
| 479 |
|
|
*/
|
| 480 |
greg |
3.11 |
|
| 481 |
|
|
#ifdef __cplusplus
|
| 482 |
|
|
}
|
| 483 |
|
|
#endif
|
