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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 3.15 by greg, Mon Jul 14 04:56:54 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 > #ifdef __cplusplus
10 > extern "C" {
11 > #endif
12  
13 + #include        "tifftypes.h"
14  
15   /****    Argument Macros    ****/
16                                  /* Flags of what to do */
# Line 32 | Line 35
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 */
# Line 48 | Line 52
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  
# Line 58 | Line 65
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  
# Line 71 | Line 80 | extern struct tmStruct {
80          RGBPRIMP        inppri;         /* current input primaries */
81          double          inpsf;          /* current input scalefactor */
82          COLORMAT        cmat;           /* color conversion matrix */
83 <        TMbright        brmin, brmax;   /* input brightness limits */  
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 */
82 – #ifdef  NOPROTO
92   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 {
93          MEM_PTR         (*Init)(struct tmStruct *tms);
94 <        int             (*NewSpace)(struct tmStruct *tms);
94 >        void            (*NewSpace)(struct tmStruct *tms);
95          void            (*Free)(MEM_PTR pp);
96   };
94 – #endif
97                                  /* our list of conversion packages */
98   extern struct tmPackage *tmPkg[TM_MAXPKG];
99   extern int      tmNumPkgs;      /* number of registered packages */
# Line 100 | Line 102 | extern int     tmNumPkgs;      /* number of registered packages
102   /****    Useful Macros    ****/
103  
104                                  /* compute luminance from encoded value */
105 < #define tmLuminance(li) exp((li)/(double)TM_BRTSCALE)
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)
# Line 115 | Line 117 | extern int     tmNumPkgs;      /* number of registered packages
117  
118   /****    Library Function Calls    ****/
119  
118 – #ifdef  NOPROTO
120  
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 –
121   extern struct tmStruct *
122   tmInit(int flags, RGBPRIMP monpri, double gamval);
123   /*
# Line 155 | Line 148 | tmClearHisto(void);
148   */
149  
150   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
151   tmAddHisto(TMbright *ls, int len, int wt);
152   /*
153          Add brightness values to current histogram.
# Line 193 | Line 160 | tmAddHisto(TMbright *ls, int len, int wt);
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.
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).
# Line 217 | Line 201 | tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len)
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   /*
# Line 226 | Line 296 | tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int
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, English ordering.
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.
# Line 248 | Line 318 | tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
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, English ordering.
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).
# Line 261 | Line 331 | tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
331          returns -       0 on success, TM_E_* on failure.
332   */
333  
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 –
334   extern int
335 < tmPull(struct tmStruct *tms);
335 > tmCvRGB48(TMbright *ls, BYTE *cs, uint16 (*scan)[3], int len, double gv);
336   /*
337 <        Pull tone mapping from anywhere in stack.
337 >        Convert 48-bit RGB scanline to encoded luminance and chrominance.
338  
339 <        tms     -       tone mapping structure to find.
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 -       1 if found in stack, 0 otherwise.
345 >        returns -       0 on success, TM_E_* on error.
346   */
347  
348   extern int
349 < tmPush(struct tmStruct *tms);
349 > tmCvGray16(TMbright *ls, uint16 *scan, int len, double gv);
350   /*
351 <        Make tone mapping active by (pulling it and) pushing it to the top.
351 >        Convert 16-bit gray scanline to encoded luminance.
352  
353 <        tms     -       initialized tone mapping structure.
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_* if tms is invalid.
358 >        returns -       0 on success, TM_E_* on error.
359   */
360  
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 –
361   /****    Notes    ****/
362   /*
363          General:
# Line 382 | Line 428 | tmDone(struct tmStruct *tms);
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 +

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