1 |
/* Copyright (c) 1997 Regents of the University of California */ |
2 |
|
3 |
/* SCCSid "$SunId$ LBL" */ |
4 |
|
5 |
/* |
6 |
* Header file for tone mapping functions. |
7 |
*/ |
8 |
/* required non-system header files */ |
9 |
#include "color.h" |
10 |
|
11 |
|
12 |
/**** Argument Macros ****/ |
13 |
/* Flags of what to do */ |
14 |
#define TM_F_HCONTR 01 /* human contrast sensitivity */ |
15 |
#define TM_F_MESOPIC 02 /* mesopic color sensitivity */ |
16 |
#define TM_F_LINEAR 04 /* linear brightness mapping */ |
17 |
#define TM_F_ACUITY 010 /* acuity adjustment */ |
18 |
#define TM_F_VEIL 020 /* veiling glare */ |
19 |
#define TM_F_CWEIGHT 040 /* center weighting */ |
20 |
#define TM_F_FOVEAL 0100 /* use foveal sample size */ |
21 |
#define TM_F_BW 0200 /* luminance only */ |
22 |
#define TM_F_NOSTDERR 0400 /* don't report errors to stderr */ |
23 |
/* combined modes */ |
24 |
#define TM_F_CAMERA 0 |
25 |
#define TM_F_HUMAN (TM_F_HCONTR|TM_F_MESOPIC|TM_F_VEIL|\ |
26 |
TM_F_ACUITY|TM_F_FOVEAL) |
27 |
#define TM_F_UNIMPL (TM_F_CWEIGHT|TM_F_VEIL|TM_F_ACUITY|TM_F_FOVEAL) |
28 |
|
29 |
/* special pointer values */ |
30 |
#define TM_XYZPRIM (RGBPRIMP)NULL /* indicate XYZ primaries (Note 1) */ |
31 |
#define TM_NOCHROM (BYTE *)NULL /* indicate no chrominance */ |
32 |
#define TM_NOCHROMP (BYTE **)NULL /* indicate no chrominances */ |
33 |
#define TM_GETFILE (FILE *)NULL /* indicate file must be opened */ |
34 |
|
35 |
/**** Error Return Values ****/ |
36 |
|
37 |
#define TM_E_OK 0 /* normal return status */ |
38 |
#define TM_E_NOMEM 1 /* out of memory */ |
39 |
#define TM_E_ILLEGAL 2 /* illegal argument value */ |
40 |
#define TM_E_TMINVAL 3 /* no valid tone mapping */ |
41 |
#define TM_E_TMFAIL 4 /* cannot compute tone mapping */ |
42 |
#define TM_E_BADFILE 5 /* cannot open or understand file */ |
43 |
#define TM_E_CODERR1 6 /* code consistency error 1 */ |
44 |
#define TM_E_CODERR2 7 /* code consistency error 2 */ |
45 |
|
46 |
|
47 |
/**** Conversion Constants and Table Sizes ****/ |
48 |
|
49 |
#define TM_BRTSCALE 128 /* brightness scale factor (integer) */ |
50 |
|
51 |
#define TM_MAXPKG 8 /* maximum number of color formats */ |
52 |
|
53 |
|
54 |
/**** Global Data Types and Structures ****/ |
55 |
|
56 |
#ifndef MEM_PTR |
57 |
#define MEM_PTR void * |
58 |
#endif |
59 |
|
60 |
extern char *tmErrorMessage[]; /* error messages */ |
61 |
extern int tmLastError; /* last error incurred by library */ |
62 |
extern char *tmLastFunction; /* error-generating function name */ |
63 |
|
64 |
typedef short TMbright; /* encoded luminance type */ |
65 |
|
66 |
/* basic tone mapping data structure */ |
67 |
extern struct tmStruct { |
68 |
int flags; /* flags of what to do */ |
69 |
RGBPRIMP monpri; /* monitor RGB primaries */ |
70 |
double mongam; /* monitor gamma value (approx.) */ |
71 |
COLOR clf; /* computed luminance coefficients */ |
72 |
int cdiv[3]; /* computed color divisors */ |
73 |
RGBPRIMP inppri; /* current input primaries */ |
74 |
double inpsf; /* current input scalefactor */ |
75 |
COLORMAT cmat; /* color conversion matrix */ |
76 |
TMbright hbrmin, hbrmax; /* histogram brightness limits */ |
77 |
int *histo; /* input histogram */ |
78 |
TMbright mbrmin, mbrmax; /* mapped brightness limits */ |
79 |
unsigned short *lumap; /* computed luminance map */ |
80 |
struct tmStruct *tmprev; /* previous tone mapping */ |
81 |
MEM_PTR pd[TM_MAXPKG]; /* pointers to private data */ |
82 |
} *tmTop; /* current tone mapping stack */ |
83 |
|
84 |
/* conversion package functions */ |
85 |
#ifdef NOPROTO |
86 |
struct tmPackage { |
87 |
MEM_PTR (*Init)(); /* initialize private data */ |
88 |
void (*NewSpace)(); /* new input color space (optional) */ |
89 |
void (*Free)(); /* free private data */ |
90 |
}; |
91 |
#else |
92 |
struct tmPackage { |
93 |
MEM_PTR (*Init)(struct tmStruct *tms); |
94 |
int (*NewSpace)(struct tmStruct *tms); |
95 |
void (*Free)(MEM_PTR pp); |
96 |
}; |
97 |
#endif |
98 |
/* our list of conversion packages */ |
99 |
extern struct tmPackage *tmPkg[TM_MAXPKG]; |
100 |
extern int tmNumPkgs; /* number of registered packages */ |
101 |
|
102 |
|
103 |
/**** Useful Macros ****/ |
104 |
|
105 |
/* compute luminance from encoded value */ |
106 |
#define tmLuminance(li) exp((li)/(double)TM_BRTSCALE) |
107 |
|
108 |
/* does tone mapping need color matrix? */ |
109 |
#define tmNeedMatrix(t) ((t)->monpri != (t)->inppri) |
110 |
|
111 |
/* register a conversion package */ |
112 |
#define tmRegPkg(pf) ( tmNumPkgs >= TM_MAXPKG ? -1 : \ |
113 |
(tmPkg[tmNumPkgs] = (pf), tmNumPkgs++) ) |
114 |
|
115 |
/* get the specific package's data */ |
116 |
#define tmPkgData(t,i) ((t)->pd[i]!=NULL ? (t)->pd[i] : (*tmPkg[i]->Init)(t)) |
117 |
|
118 |
|
119 |
/**** Library Function Calls ****/ |
120 |
|
121 |
#ifdef NOPROTO |
122 |
|
123 |
extern struct tmStruct *tmInit(), *tmPop(), *tmDup(); |
124 |
extern void tmClearHisto(), tmDone(); |
125 |
extern int tmSetSpace(), tmCvColors(), tmCvColrs(); |
126 |
extern int tmAddHisto(), tmComputeMapping(), tmMapPixels(); |
127 |
extern int tmLoadPicture(), tmMapPicture(), tmPull(), tmPush(); |
128 |
|
129 |
#else |
130 |
|
131 |
extern struct tmStruct * |
132 |
tmInit(int flags, RGBPRIMP monpri, double gamval); |
133 |
/* |
134 |
Initialize new tone mapping and push it onto stack. |
135 |
|
136 |
flags - TM_F_* flags indicating what is to be done. |
137 |
monpri - display monitor primaries (Note 1). |
138 |
gamval - display gamma response (can be approximate). |
139 |
|
140 |
returns - new tmTop, or NULL if insufficient memory. |
141 |
*/ |
142 |
|
143 |
extern int |
144 |
tmSetSpace(RGBPRIMP pri, double sf); |
145 |
/* |
146 |
Set color primaries and scale factor for incoming scanlines. |
147 |
|
148 |
pri - RGB color input primaries (Note 1). |
149 |
sf - scale factor to get to luminance in cd/m^2. |
150 |
|
151 |
returns - 0 on success, TM_E_* code on failure. |
152 |
*/ |
153 |
|
154 |
extern void |
155 |
tmClearHisto(void); |
156 |
/* |
157 |
Clear histogram for current tone mapping. |
158 |
*/ |
159 |
|
160 |
extern int |
161 |
tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len); |
162 |
/* |
163 |
Convert RGB/XYZ float scanline to encoded luminance and chrominance. |
164 |
|
165 |
ls - returned encoded luminance values. |
166 |
cs - returned encoded chrominance values (Note 2). |
167 |
scan - input scanline. |
168 |
len - scanline length. |
169 |
|
170 |
returns - 0 on success, TM_E_* on error. |
171 |
*/ |
172 |
|
173 |
extern int |
174 |
tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len); |
175 |
/* |
176 |
Convert RGBE/XYZE scanline to encoded luminance and chrominance. |
177 |
|
178 |
ls - returned encoded luminance values. |
179 |
cs - returned encoded chrominance values (Note 2). |
180 |
scan - input scanline. |
181 |
len - scanline length. |
182 |
|
183 |
returns - 0 on success, TM_E_* on error. |
184 |
*/ |
185 |
|
186 |
extern int |
187 |
tmAddHisto(TMbright *ls, int len, int wt); |
188 |
/* |
189 |
Add brightness values to current histogram. |
190 |
|
191 |
ls - encoded luminance values. |
192 |
len - number of luminance values. |
193 |
wt - integer weight to use for each value (usually 1 or -1). |
194 |
|
195 |
returns - 0 on success, TM_E_* on error. |
196 |
*/ |
197 |
|
198 |
extern int |
199 |
tmComputeMapping(double gamval, double Lddyn, double Ldmax); |
200 |
/* |
201 |
Compute tone mapping function. This mapping will be used |
202 |
in subsequent calls to tmMapPixels() until a new tone mapping |
203 |
is computed. I.e., calls to tmAddHisto() have no immediate effect. |
204 |
|
205 |
gamval - display gamma response (0. for default). |
206 |
Lddyn - the display's dynamic range (0. for default). |
207 |
Ldmax - maximum display luminance in cd/m^2 (0. for default). |
208 |
|
209 |
returns - 0 on success, TM_E_* on failure. |
210 |
*/ |
211 |
|
212 |
extern int |
213 |
tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len); |
214 |
/* |
215 |
Apply tone mapping function to pixel values. |
216 |
|
217 |
ps - returned pixel values (Note 2). |
218 |
ls - encoded luminance values. |
219 |
cs - encoded chrominance values (Note 2). |
220 |
len - number of pixels. |
221 |
|
222 |
returns - 0 on success, TM_E_* on failure. |
223 |
*/ |
224 |
|
225 |
extern int |
226 |
tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp, |
227 |
char *fname, FILE *fp); |
228 |
/* |
229 |
Load Radiance picture and convert to tone mapping representation. |
230 |
Memory for the luminance and chroma arrays is allocated using |
231 |
malloc(3), and should be freed with free(3) when no longer needed. |
232 |
Calls tmSetSpace() to calibrate input color space. |
233 |
|
234 |
lpp - returned array of encoded luminances, English ordering. |
235 |
cpp - returned array of encoded chrominances (Note 2). |
236 |
xp, yp - returned picture dimensions. |
237 |
fname - picture file name. |
238 |
fp - pointer to open file (Note 3). |
239 |
|
240 |
returns - 0 on success, TM_E_* on failure. |
241 |
*/ |
242 |
|
243 |
extern int |
244 |
tmMapPicture(BYTE **psp, int *xp, int *yp, int flags, |
245 |
RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax, |
246 |
char *fname, FILE *fp); |
247 |
/* |
248 |
Load and apply tone mapping to Radiance picture. |
249 |
Stack is restored to its original state upon return. |
250 |
If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture() |
251 |
calls pcond to perform the actual conversion, which takes |
252 |
longer but gives access to all the TM_F_* features. |
253 |
Memory for the final pixel array is allocated using malloc(3), |
254 |
and should be freed with free(3) when it is no longer needed. |
255 |
|
256 |
psp - returned array of tone mapped pixels, English ordering. |
257 |
xp, yp - returned picture dimensions. |
258 |
flags - TM_F_* flags indicating what is to be done. |
259 |
monpri - display monitor primaries (Note 1). |
260 |
gamval - display gamma response. |
261 |
Lddyn - the display's dynamic range (0. for default). |
262 |
Ldmax - maximum display luminance in cd/m^2 (0. for default). |
263 |
fname - picture file name. |
264 |
fp - pointer to open file (Note 3). |
265 |
|
266 |
returns - 0 on success, TM_E_* on failure. |
267 |
*/ |
268 |
|
269 |
extern struct tmStruct * |
270 |
tmPop(void); |
271 |
/* |
272 |
Pops current tone mapping from stack. |
273 |
|
274 |
returns - pointer to tone mapping structure, or NULL if none. |
275 |
*/ |
276 |
|
277 |
extern int |
278 |
tmPull(struct tmStruct *tms); |
279 |
/* |
280 |
Pull tone mapping from anywhere in stack. |
281 |
|
282 |
tms - tone mapping structure to find. |
283 |
|
284 |
returns - 1 if found in stack, 0 otherwise. |
285 |
*/ |
286 |
|
287 |
extern int |
288 |
tmPush(struct tmStruct *tms); |
289 |
/* |
290 |
Make tone mapping active by (pulling it and) pushing it to the top. |
291 |
|
292 |
tms - initialized tone mapping structure. |
293 |
|
294 |
returns - 0 on success, TM_E_* if tms is invalid. |
295 |
*/ |
296 |
|
297 |
extern struct tmStruct * |
298 |
tmDup(void); |
299 |
/* |
300 |
Duplicate the current tone mapping into a new structure on the stack. |
301 |
|
302 |
returns - pointer to new top, or NULL on error. |
303 |
*/ |
304 |
|
305 |
extern void |
306 |
tmDone(struct tmStruct *tms); |
307 |
/* |
308 |
Free data associated with the given tone mapping structure. |
309 |
Calls tmPull() first to remove it from the stack if present. |
310 |
The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL) |
311 |
all have the same effect, which is to remove and free |
312 |
the current tone mapping. |
313 |
|
314 |
tms - tone mapping structure to free. |
315 |
*/ |
316 |
|
317 |
#endif |
318 |
|
319 |
|
320 |
/**** Notes ****/ |
321 |
/* |
322 |
General: |
323 |
|
324 |
The usual sequence after calling tmInit() is to convert some |
325 |
pixel values to chroma and luminance encodings, which can |
326 |
be passed to tmAddHisto() to put into the tone mapping histogram. |
327 |
This histogram is then used along with the display parameters |
328 |
by tmComputeMapping() to compute the luminance mapping function. |
329 |
(Colors are tone-mapped as they are converted if TM_F_MESOPIC |
330 |
is set.) The encoded chroma and luminance values may then be |
331 |
passed to tmMapPixels() to apply the computed tone mapping in |
332 |
a second pass. |
333 |
|
334 |
Especially for RGBE colors in the same color space as the |
335 |
target display, the conversion to chroma and luminance values |
336 |
is fast enough that it may be recomputed on the second pass |
337 |
if memory is at a premium. (Since the chroma values are only |
338 |
used during final mapping, setting the cs parameter to TM_NOCHROM |
339 |
on the first pass will save time.) Another memory saving option |
340 |
if third and subsequent passes are not needed is to use the |
341 |
same array to store the mapped pixels as used to store |
342 |
the encoded chroma values. This way, only two extra bytes |
343 |
for storing encoded luminances are required per pixel. This |
344 |
is the method employed by tmMapPicture(), for example. |
345 |
*/ |
346 |
/* |
347 |
Note 1: |
348 |
|
349 |
All RGBPRIMP values should be pointers to static structures. |
350 |
I.e., the same pointer should be used for the same primaries, |
351 |
and those primaries should not change from one call to the next. |
352 |
This is because the routines use the pointer value to identify |
353 |
computed conversion matrices, so the matrices do not have to be |
354 |
rebuilt each time. If you are using the standard primaries, |
355 |
use the standard primary pointer, stdprims. |
356 |
|
357 |
To indicate a set of input primaries are actually CIE XYZ, |
358 |
the TM_XYZPRIM macro may be passed. If the input primaries |
359 |
are unknown, it is wisest to pass tmTop->monpri to tmSetSpace(). |
360 |
By default, the input primaries equal the monitor primaries |
361 |
and the scalefactor is set to WHTEFFICACY in tmInit(). |
362 |
*/ |
363 |
/* |
364 |
Note 2: |
365 |
|
366 |
Chrominance is optional in most of these routines, whether |
367 |
TM_F_BW is set or not. Passing a value of TM_NOCHROM (or |
368 |
TM_NOCHROMP for picture reading) indicates that returned |
369 |
color values are not desired. |
370 |
|
371 |
If TM_NOCHROM is passed to a mapping routine expecting chroma |
372 |
input, it will do without it and return luminance channel |
373 |
rather than RGB pixel values. Otherwise, the array for |
374 |
returned pixel values may be the same array used to pass |
375 |
encoded chrominances if no other mappings are desired. |
376 |
*/ |
377 |
/* |
378 |
Note 3: |
379 |
|
380 |
Picture files may either be opened by the calling routine or by |
381 |
the library function. If opened by the calling routine, the |
382 |
pointer to the stream is passed, which may be a pipe or other |
383 |
non-seekable input as it is only read once. It must be |
384 |
positioned at the beginning when the function is called, and it |
385 |
will be positioned at the end on return. It will not be closed. |
386 |
If the passed stream pointer is TM_GETFILE, then the library |
387 |
function will open the file, read its contents and close it |
388 |
before returning, whether or not an error was encountered. |
389 |
*/ |