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root/radiance/ray/src/common/tonemap.h
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Comparing ray/src/common/tonemap.h (file contents):
Revision 3.5 by greg, Mon Apr 21 15:23:42 1997 UTC vs.
Revision 3.16 by schorsch, Mon Jul 14 22:23:59 2003 UTC

# Line 1 | Line 1
1 < /* Copyright (c) 1997 Regents of the University of California */
2 <
3 < /* SCCSid "$SunId$ LBL" */
4 <
1 > /* RCSid $Id$ */
2   /*
3   * Header file for tone mapping functions.
4 + *
5 + * Include after "color.h"
6   */
7 <                                /* required non-system header files */
8 < #include        "color.h"
7 > #ifndef _RAD_TONEMAP_H_
8 > #define _RAD_TONEMAP_H_
9  
10 + #include        "tifftypes.h"
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 */
# Line 32 | Line 36
36   #define TM_NOCHROMP     (BYTE **)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 */
# Line 48 | Line 53
53  
54   #define TM_BRTSCALE     128             /* brightness scale factor (integer) */
55  
56 + #define TM_NOBRT        (-1<<15)        /* bogus brightness value */
57 + #define TM_NOLUM        (1e-17)         /* ridiculously small luminance */
58 +
59   #define TM_MAXPKG       8               /* maximum number of color formats */
60  
61  
# Line 58 | Line 66
66   #endif
67  
68   extern char     *tmErrorMessage[];      /* error messages */
69 + extern int      tmLastError;            /* last error incurred by library */
70 + extern char     *tmLastFunction;        /* error-generating function name */
71  
72   typedef short   TMbright;               /* encoded luminance type */
73  
# Line 71 | Line 81 | extern struct tmStruct {
81          RGBPRIMP        inppri;         /* current input primaries */
82          double          inpsf;          /* current input scalefactor */
83          COLORMAT        cmat;           /* color conversion matrix */
84 <        TMbright        brmin, brmax;   /* input brightness limits */  
84 >        TMbright        hbrmin, hbrmax; /* histogram brightness limits */      
85          int             *histo;         /* input histogram */
86 +        TMbright        mbrmin, mbrmax; /* mapped brightness limits */
87          unsigned short  *lumap;         /* computed luminance map */
88          struct tmStruct *tmprev;        /* previous tone mapping */
89          MEM_PTR         pd[TM_MAXPKG];  /* pointers to private data */
90   }       *tmTop;                 /* current tone mapping stack */
91  
92                                  /* conversion package functions */
82 – #ifdef  NOPROTO
93   struct tmPackage {
84 –        MEM_PTR         (*Init)();      /* initialize private data */
85 –        void            (*NewSpace)();  /* new input color space (optional) */
86 –        void            (*Free)();      /* free private data */
87 – };
88 – #else
89 – struct tmPackage {
94          MEM_PTR         (*Init)(struct tmStruct *tms);
95 <        int             (*NewSpace)(struct tmStruct *tms);
95 >        void            (*NewSpace)(struct tmStruct *tms);
96          void            (*Free)(MEM_PTR pp);
97   };
94 – #endif
98                                  /* our list of conversion packages */
99   extern struct tmPackage *tmPkg[TM_MAXPKG];
100   extern int      tmNumPkgs;      /* number of registered packages */
# Line 100 | Line 103 | extern int     tmNumPkgs;      /* number of registered packages
103   /****    Useful Macros    ****/
104  
105                                  /* compute luminance from encoded value */
106 < #define tmLuminance(li) exp((li)/(double)TM_BRTSCALE)
106 > #define tmLuminance(li) exp((li)*(1./TM_BRTSCALE))
107  
108                                  /* does tone mapping need color matrix? */
109   #define tmNeedMatrix(t) ((t)->monpri != (t)->inppri)
# Line 115 | Line 118 | extern int     tmNumPkgs;      /* number of registered packages
118  
119   /****    Library Function Calls    ****/
120  
118 – #ifdef  NOPROTO
121  
120 – extern struct tmStruct  *tmInit(), *tmPop(), *tmDup();
121 – extern void     tmClearHisto(), tmDone();
122 – extern int      tmSetSpace(), tmCvColors(), tmCvColrs();
123 – extern int      tmAddHisto(), tmComputeMapping(), tmMapPixels();
124 – extern int      tmLoadPicture(), tmMapPicture(), tmPull(), tmPush();
125 –
126 – #else
127 –
122   extern struct tmStruct *
123   tmInit(int flags, RGBPRIMP monpri, double gamval);
124   /*
# Line 155 | Line 149 | tmClearHisto(void);
149   */
150  
151   extern int
158 – tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len);
159 – /*
160 –        Convert RGB/XYZ float scanline to encoded luminance and chrominance.
161 –
162 –        ls      -       returned encoded luminance values.
163 –        cs      -       returned encoded chrominance values (Note 2).
164 –        scan    -       input scanline.
165 –        len     -       scanline length.
166 –
167 –        returns -       0 on success, TM_E_* on error.
168 – */
169 –
170 – extern int
171 – tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len);
172 – /*
173 –        Convert RGBE/XYZE scanline to encoded luminance and chrominance.
174 –
175 –        ls      -       returned encoded luminance values.
176 –        cs      -       returned encoded chrominance values (Note 2).
177 –        scan    -       input scanline.
178 –        len     -       scanline length.
179 –
180 –        returns -       0 on success, TM_E_* on error.
181 – */
182 –
183 – extern int
152   tmAddHisto(TMbright *ls, int len, int wt);
153   /*
154          Add brightness values to current histogram.
# Line 193 | Line 161 | tmAddHisto(TMbright *ls, int len, int wt);
161   */
162  
163   extern int
164 + tmFixedMapping(double expmult, double gamval);
165 + /*
166 +        Assign a fixed, linear tone-mapping using the given multiplier,
167 +        which is the ratio of maximum output to uncalibrated input.
168 +        This mapping will be used in subsequent calls to tmMapPixels()
169 +        until a new tone mapping is computed.
170 +        Only the min. and max. values are used from the histogram.
171 +        
172 +        expmult -       the fixed exposure multiplier to use.
173 +        gamval  -       display gamma response (0. for default).
174 +        returns -       0 on success, TM_E_* on error.
175 + */
176 +
177 + extern int
178   tmComputeMapping(double gamval, double Lddyn, double Ldmax);
179   /*
180 <        Compute tone mapping function.
180 >        Compute tone mapping function from the current histogram.
181 >        This mapping will be used in subsequent calls to tmMapPixels()
182 >        until a new tone mapping is computed.
183 >        I.e., calls to tmAddHisto() have no immediate effect.
184  
185          gamval  -       display gamma response (0. for default).
186          Lddyn   -       the display's dynamic range (0. for default).
# Line 217 | Line 202 | tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len)
202          returns -       0 on success, TM_E_* on failure.
203   */
204  
205 + extern struct tmStruct *
206 + tmPop(void);
207 + /*
208 +        Pops current tone mapping from stack.
209 +
210 +        returns -       pointer to tone mapping structure, or NULL if none.
211 + */
212 +
213   extern int
214 + tmPull(struct tmStruct *tms);
215 + /*
216 +        Pull tone mapping from anywhere in stack.
217 +
218 +        tms     -       tone mapping structure to find.
219 +
220 +        returns -       1 if found in stack, 0 otherwise.
221 + */
222 +
223 + extern int
224 + tmPush(struct tmStruct *tms);
225 + /*
226 +        Make tone mapping active by (pulling it and) pushing it to the top.
227 +
228 +        tms     -       initialized tone mapping structure.
229 +
230 +        returns -       0 on success, TM_E_* if tms is invalid.
231 + */
232 +
233 + extern struct tmStruct *
234 + tmDup(void);
235 + /*
236 +        Duplicate the current tone mapping into a new structure on the stack.
237 +
238 +        returns -       pointer to new top, or NULL on error.
239 + */
240 +
241 + extern void
242 + tmDone(struct tmStruct *tms);
243 + /*
244 +        Free data associated with the given tone mapping structure.
245 +        Calls tmPull() first to remove it from the stack if present.
246 +        The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL)
247 +        all have the same effect, which is to remove and free
248 +        the current tone mapping.
249 +
250 +        tms     -       tone mapping structure to free.
251 + */
252 +
253 + extern int
254 + tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len);
255 + /*
256 +        Convert RGB/XYZ float scanline to encoded luminance and chrominance.
257 +
258 +        ls      -       returned encoded luminance values.
259 +        cs      -       returned encoded chrominance values (Note 2).
260 +        scan    -       input scanline.
261 +        len     -       scanline length.
262 +
263 +        returns -       0 on success, TM_E_* on error.
264 + */
265 +
266 + extern int
267 + tmCvGrays(TMbright *ls, float *scan, int len);
268 + /*
269 +        Convert gray float scanline to encoded luminance.
270 +
271 +        ls      -       returned encoded luminance values.
272 +        scan    -       input scanline.
273 +        len     -       scanline length.
274 +
275 +        returns -       0 on success, TM_E_* on error.
276 + */
277 +
278 + extern int
279 + tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len);
280 + /*
281 +        Convert RGBE/XYZE scanline to encoded luminance and chrominance.
282 +
283 +        ls      -       returned encoded luminance values.
284 +        cs      -       returned encoded chrominance values (Note 2).
285 +        scan    -       input scanline.
286 +        len     -       scanline length.
287 +
288 +        returns -       0 on success, TM_E_* on error.
289 + */
290 +
291 + extern int
292   tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp,
293                  char *fname, FILE *fp);
294   /*
# Line 226 | Line 297 | tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int
297          malloc(3), and should be freed with free(3) when no longer needed.
298          Calls tmSetSpace() to calibrate input color space.
299  
300 <        lpp     -       returned array of encoded luminances, English ordering.
300 >        lpp     -       returned array of encoded luminances, picture ordering.
301          cpp     -       returned array of encoded chrominances (Note 2).
302          xp, yp  -       returned picture dimensions.
303          fname   -       picture file name.
# Line 248 | Line 319 | tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
319          Memory for the final pixel array is allocated using malloc(3),
320          and should be freed with free(3) when it is no longer needed.
321  
322 <        psp     -       returned array of tone mapped pixels, English ordering.
322 >        psp     -       returned array of tone mapped pixels, picture ordering.
323          xp, yp  -       returned picture dimensions.
324          flags   -       TM_F_* flags indicating what is to be done.
325          monpri  -       display monitor primaries (Note 1).
# Line 261 | Line 332 | tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
332          returns -       0 on success, TM_E_* on failure.
333   */
334  
264 – extern struct tmStruct *
265 – tmPop(void);
266 – /*
267 –        Pops current tone mapping from stack.
268 –
269 –        returns -       pointer to tone mapping structure, or NULL if none.
270 – */
271 –
335   extern int
336 < tmPull(struct tmStruct *tms);
336 > tmCvRGB48(TMbright *ls, BYTE *cs, uint16 (*scan)[3], int len, double gv);
337   /*
338 <        Pull tone mapping from anywhere in stack.
338 >        Convert 48-bit RGB scanline to encoded luminance and chrominance.
339  
340 <        tms     -       tone mapping structure to find.
340 >        ls      -       returned encoded luminance values.
341 >        cs      -       returned encoded chrominance values (Note 2).
342 >        scan    -       input scanline.
343 >        len     -       scanline length.
344 >        gv      -       input gamma value.
345  
346 <        returns -       1 if found in stack, 0 otherwise.
346 >        returns -       0 on success, TM_E_* on error.
347   */
348  
349   extern int
350 < tmPush(struct tmStruct *tms);
350 > tmCvGray16(TMbright *ls, uint16 *scan, int len, double gv);
351   /*
352 <        Make tone mapping active by (pulling it and) pushing it to the top.
352 >        Convert 16-bit gray scanline to encoded luminance.
353  
354 <        tms     -       initialized tone mapping structure.
354 >        ls      -       returned encoded luminance values.
355 >        scan    -       input scanline.
356 >        len     -       scanline length.
357 >        gv      -       input gamma value.
358  
359 <        returns -       0 on success, TM_E_* if tms is invalid.
359 >        returns -       0 on success, TM_E_* on error.
360   */
361  
292 – extern struct tmStruct *
293 – tmDup(void);
294 – /*
295 –        Duplicate the current tone mapping into a new structure on the stack.
296 –
297 –        returns -       pointer to new top, or NULL on error.
298 – */
299 –
300 – extern void
301 – tmDone(struct tmStruct *tms);
302 – /*
303 –        Free data associated with the given tone mapping structure.
304 –        Calls tmPull() first to remove it from the stack if present.
305 –        The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL)
306 –        all have the same effect, which is to remove and free
307 –        the current tone mapping.
308 –
309 –        tms     -       tone mapping structure to free.
310 – */
311 –
312 – #endif
313 –
314 –
362   /****    Notes    ****/
363   /*
364          General:
# Line 382 | Line 429 | tmDone(struct tmStruct *tms);
429          function will open the file, read its contents and close it
430          before returning, whether or not an error was encountered.
431   */
432 +
433 + #ifdef __cplusplus
434 + }
435 + #endif
436 + #endif /* _RAD_TONEMAP_H_ */
437 +

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