ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/common/tonemap.h
(Generate patch)

Comparing ray/src/common/tonemap.h (file contents):
Revision 3.4 by greg, Fri Apr 18 13:59:48 1997 UTC vs.
Revision 3.12 by greg, Tue Feb 25 02:47:22 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   */
8 –                                /* required non-system header files */
9 – #include        "color.h"
7  
8 + #include "copyright.h"
9  
10 + #ifdef __cplusplus
11 + extern "C" {
12 + #endif
13 +
14   /****    Argument Macros    ****/
15                                  /* Flags of what to do */
16   #define TM_F_HCONTR     01              /* human contrast sensitivity */
# Line 32 | Line 34
34   #define TM_NOCHROMP     (BYTE **)NULL   /* indicate no chrominances */
35   #define TM_GETFILE      (FILE *)NULL    /* indicate file must be opened */
36  
37 +
38   /****    Error Return Values    ****/
39  
40   #define TM_E_OK         0               /* normal return status */
# Line 48 | Line 51
51  
52   #define TM_BRTSCALE     128             /* brightness scale factor (integer) */
53  
54 + #define TM_NOBRT        (-1<<15)        /* bogus brightness value */
55 + #define TM_NOLUM        (1e-17)         /* ridiculously small luminance */
56 +
57   #define TM_MAXPKG       8               /* maximum number of color formats */
58  
59  
# Line 58 | Line 64
64   #endif
65  
66   extern char     *tmErrorMessage[];      /* error messages */
67 + extern int      tmLastError;            /* last error incurred by library */
68 + extern char     *tmLastFunction;        /* error-generating function name */
69  
70   typedef short   TMbright;               /* encoded luminance type */
71  
# Line 71 | Line 79 | extern struct tmStruct {
79          RGBPRIMP        inppri;         /* current input primaries */
80          double          inpsf;          /* current input scalefactor */
81          COLORMAT        cmat;           /* color conversion matrix */
82 <        TMbright        brmin, brmax;   /* input brightness limits */  
82 >        TMbright        hbrmin, hbrmax; /* histogram brightness limits */      
83          int             *histo;         /* input histogram */
84 +        TMbright        mbrmin, mbrmax; /* mapped brightness limits */
85          unsigned short  *lumap;         /* computed luminance map */
86          struct tmStruct *tmprev;        /* previous tone mapping */
87          MEM_PTR         pd[TM_MAXPKG];  /* pointers to private data */
# Line 88 | Line 97 | struct tmPackage {
97   #else
98   struct tmPackage {
99          MEM_PTR         (*Init)(struct tmStruct *tms);
100 <        int             (*NewSpace)(struct tmStruct *tms);
100 >        void            (*NewSpace)(struct tmStruct *tms);
101          void            (*Free)(MEM_PTR pp);
102   };
103   #endif
# Line 100 | Line 109 | extern int     tmNumPkgs;      /* number of registered packages
109   /****    Useful Macros    ****/
110  
111                                  /* compute luminance from encoded value */
112 < #define tmLuminance(li) exp((li)/(double)TM_BRTSCALE)
112 > #define tmLuminance(li) exp((li)*(1./TM_BRTSCALE))
113  
114                                  /* does tone mapping need color matrix? */
115   #define tmNeedMatrix(t) ((t)->monpri != (t)->inppri)
# Line 118 | Line 127 | extern int     tmNumPkgs;      /* number of registered packages
127   #ifdef  NOPROTO
128  
129   extern struct tmStruct  *tmInit(), *tmPop(), *tmDup();
130 + extern int      tmSetSpace(), tmPull(), tmPush();
131   extern void     tmClearHisto(), tmDone();
132 < extern int      tmSetSpace(), tmCvColors(), tmCvColrs();
133 < extern int      tmAddHisto(), tmComputeMapping(), tmMapPixels();
134 < extern int      tmLoadPicture(), tmMapPicture(), tmPull(), tmPush();
132 > extern int      tmAddHisto();
133 > extern int      tmFixedMapping(), tmComputeMapping(), tmMapPixels();
134 > extern int      tmCvColors(), tmCvGrays(), tmCvColrs();
135 > extern int      tmLoadPicture(), tmMapPicture();
136  
137   #else
138  
# Line 155 | Line 166 | tmClearHisto(void);
166   */
167  
168   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
169   tmAddHisto(TMbright *ls, int len, int wt);
170   /*
171          Add brightness values to current histogram.
# Line 193 | Line 178 | tmAddHisto(TMbright *ls, int len, int wt);
178   */
179  
180   extern int
181 + tmFixedMapping(double expmult, double gamval);
182 + /*
183 +        Assign a fixed, linear tone-mapping using the given multiplier,
184 +        which is the ratio of maximum output to uncalibrated input.
185 +        This mapping will be used in subsequent calls to tmMapPixels()
186 +        until a new tone mapping is computed.
187 +        Only the min. and max. values are used from the histogram.
188 +        
189 +        expmult -       the fixed exposure multiplier to use.
190 +        gamval  -       display gamma response (0. for default).
191 +        returns -       0 on success, TM_E_* on error.
192 + */
193 +
194 + extern int
195   tmComputeMapping(double gamval, double Lddyn, double Ldmax);
196   /*
197 <        Compute tone mapping function.
197 >        Compute tone mapping function from the current histogram.
198 >        This mapping will be used in subsequent calls to tmMapPixels()
199 >        until a new tone mapping is computed.
200 >        I.e., calls to tmAddHisto() have no immediate effect.
201  
202          gamval  -       display gamma response (0. for default).
203          Lddyn   -       the display's dynamic range (0. for default).
# Line 217 | Line 219 | tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len)
219          returns -       0 on success, TM_E_* on failure.
220   */
221  
220 – extern int
221 – tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp,
222 –                char *fname, FILE *fp);
223 – /*
224 –        Load Radiance picture and convert to tone mapping representation.
225 –        Calls tmSetSpace() to calibrate input color space.
226 –
227 –        lpp     -       returned array of encoded luminances, English ordering.
228 –        cpp     -       returned array of encoded chrominances (Note 2).
229 –        xp, yp  -       returned picture dimensions.
230 –        fname   -       picture file name.
231 –        fp      -       pointer to open file (Note 3).
232 –
233 –        returns -       0 on success, TM_E_* on failure.
234 – */
235 –
236 – extern int
237 – tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
238 –                RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax,
239 –                char *fname, FILE *fp);
240 – /*
241 –        Load and apply tone mapping to Radiance picture.
242 –        Stack is restored to its original state upon return.
243 –        If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture()
244 –        calls pcond to perform the actual conversion, which takes
245 –        longer but gives access to all the TM_F_* features.
246 –
247 –        psp     -       returned array of tone mapped pixels, English ordering.
248 –        xp, yp  -       returned picture dimensions.
249 –        flags   -       TM_F_* flags indicating what is to be done.
250 –        monpri  -       display monitor primaries (Note 1).
251 –        gamval  -       display gamma response.
252 –        Lddyn   -       the display's dynamic range (0. for default).
253 –        Ldmax   -       maximum display luminance in cd/m^2 (0. for default).
254 –        fname   -       picture file name.
255 –        fp      -       pointer to open file (Note 3).
256 –
257 –        returns -       0 on success, TM_E_* on failure.
258 – */
259 –
222   extern struct tmStruct *
223   tmPop(void);
224   /*
# Line 305 | Line 267 | tmDone(struct tmStruct *tms);
267          tms     -       tone mapping structure to free.
268   */
269  
270 + extern int
271 + tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len);
272 + /*
273 +        Convert RGB/XYZ float scanline to encoded luminance and chrominance.
274 +
275 +        ls      -       returned encoded luminance values.
276 +        cs      -       returned encoded chrominance values (Note 2).
277 +        scan    -       input scanline.
278 +        len     -       scanline length.
279 +
280 +        returns -       0 on success, TM_E_* on error.
281 + */
282 +
283 + extern int
284 + tmCvGrays(TMbright *ls, float *scan, int len);
285 + /*
286 +        Convert gray float scanline to encoded luminance.
287 +
288 +        ls      -       returned encoded luminance values.
289 +        scan    -       input scanline.
290 +        len     -       scanline length.
291 +
292 +        returns -       0 on success, TM_E_* on error.
293 + */
294 +
295 + extern int
296 + tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len);
297 + /*
298 +        Convert RGBE/XYZE scanline to encoded luminance and chrominance.
299 +
300 +        ls      -       returned encoded luminance values.
301 +        cs      -       returned encoded chrominance values (Note 2).
302 +        scan    -       input scanline.
303 +        len     -       scanline length.
304 +
305 +        returns -       0 on success, TM_E_* on error.
306 + */
307 +
308 + extern int
309 + tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp,
310 +                char *fname, FILE *fp);
311 + /*
312 +        Load Radiance picture and convert to tone mapping representation.
313 +        Memory for the luminance and chroma arrays is allocated using
314 +        malloc(3), and should be freed with free(3) when no longer needed.
315 +        Calls tmSetSpace() to calibrate input color space.
316 +
317 +        lpp     -       returned array of encoded luminances, picture ordering.
318 +        cpp     -       returned array of encoded chrominances (Note 2).
319 +        xp, yp  -       returned picture dimensions.
320 +        fname   -       picture file name.
321 +        fp      -       pointer to open file (Note 3).
322 +
323 +        returns -       0 on success, TM_E_* on failure.
324 + */
325 +
326 + extern int
327 + tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
328 +                RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax,
329 +                char *fname, FILE *fp);
330 + /*
331 +        Load and apply tone mapping to Radiance picture.
332 +        Stack is restored to its original state upon return.
333 +        If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture()
334 +        calls pcond to perform the actual conversion, which takes
335 +        longer but gives access to all the TM_F_* features.
336 +        Memory for the final pixel array is allocated using malloc(3),
337 +        and should be freed with free(3) when it is no longer needed.
338 +
339 +        psp     -       returned array of tone mapped pixels, picture ordering.
340 +        xp, yp  -       returned picture dimensions.
341 +        flags   -       TM_F_* flags indicating what is to be done.
342 +        monpri  -       display monitor primaries (Note 1).
343 +        gamval  -       display gamma response.
344 +        Lddyn   -       the display's dynamic range (0. for default).
345 +        Ldmax   -       maximum display luminance in cd/m^2 (0. for default).
346 +        fname   -       picture file name.
347 +        fp      -       pointer to open file (Note 3).
348 +
349 +        returns -       0 on success, TM_E_* on failure.
350 + */
351 +
352   #endif
353  
354  
# Line 316 | Line 360 | tmDone(struct tmStruct *tms);
360          pixel values to chroma and luminance encodings, which can
361          be passed to tmAddHisto() to put into the tone mapping histogram.
362          This histogram is then used along with the display parameters
363 <        by tmComputMapping() to compute the luminance mapping function.
363 >        by tmComputeMapping() to compute the luminance mapping function.
364          (Colors are tone-mapped as they are converted if TM_F_MESOPIC
365          is set.)  The encoded chroma and luminance values may then be
366          passed to tmMapPixels() to apply the computed tone mapping in
# Line 378 | Line 422 | tmDone(struct tmStruct *tms);
422          function will open the file, read its contents and close it
423          before returning, whether or not an error was encountered.
424   */
425 +
426 + #ifdef __cplusplus
427 + }
428 + #endif

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines