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/* Copyright (c) 1997 Regents of the University of California */ |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* |
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* Header file for tone mapping functions. |
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* |
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* Include after "color.h" |
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*/ |
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/* required non-system header files */ |
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#include "color.h" |
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/**** Argument Macros ****/ |
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/* Flags of what to do */ |
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#define TM_F_HCONTR 01 /* human contrast sensitivity */ |
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#define TM_NOCHROMP (BYTE **)NULL /* indicate no chrominances */ |
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#define TM_GETFILE (FILE *)NULL /* indicate file must be opened */ |
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/**** Error Return Values ****/ |
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#define TM_E_OK 0 /* normal return status */ |
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#define TM_E_TMINVAL 3 /* no valid tone mapping */ |
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#define TM_E_TMFAIL 4 /* cannot compute tone mapping */ |
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#define TM_E_BADFILE 5 /* cannot open or understand file */ |
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#define TM_E_CODERR1 6 /* code consistency error 1 */ |
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#define TM_E_CODERR2 7 /* code consistency error 2 */ |
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/**** Conversion Constants and Table Sizes ****/ |
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#define TM_BRTSCALE 128 /* brightness scale factor (integer) */ |
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#define TM_GAMTSZ 1024 /* gamma lookup table size */ |
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#define TM_MAXPKG 8 /* maximum number of color formats */ |
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/**** Global Data Structures ****/ |
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/**** Global Data Types and Structures ****/ |
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#ifndef MEM_PTR |
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#define MEM_PTR void * |
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#endif |
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extern char *tmErrorMessage[]; /* error messages */ |
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extern int tmLastError; /* last error incurred by library */ |
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extern char *tmLastFunction; /* error-generating function name */ |
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typedef short TMbright; /* encoded luminance type */ |
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int flags; /* flags of what to do */ |
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RGBPRIMP monpri; /* monitor RGB primaries */ |
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double mongam; /* monitor gamma value (approx.) */ |
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BYTE gamb[TM_GAMTSZ];/* gamma lookup table from mongam */ |
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COLOR clf; /* computed luminance coefficients */ |
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COLR clfb; /* normalized version of clf */ |
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int cdiv[3]; /* computed color divisors */ |
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RGBPRIMP inppri; /* current input primaries */ |
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double inpsf; /* current input scalefactor */ |
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TMbright inpsfb; /* encoded version of inpsf */ |
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COLORMAT cmat; /* color conversion matrix */ |
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TMbright brmin, brmax; /* input brightness limits */ |
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TMbright hbrmin, hbrmax; /* histogram brightness limits */ |
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int *histo; /* input histogram */ |
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TMbright mbrmin, mbrmax; /* mapped brightness limits */ |
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unsigned short *lumap; /* computed luminance map */ |
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struct tmStruct *tmprev; /* previous tone mapping */ |
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MEM_PTR pd[TM_MAXPKG]; /* pointers to private data */ |
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} *tmTop; /* current tone mapping stack */ |
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/* conversion package functions */ |
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#ifdef NOPROTO |
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struct tmPackage { |
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MEM_PTR (*Init)(); /* initialize private data */ |
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void (*NewSpace)(); /* new input color space (optional) */ |
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void (*Free)(); /* free private data */ |
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}; |
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#else |
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struct tmPackage { |
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MEM_PTR (*Init)(struct tmStruct *tms); |
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int (*NewSpace)(struct tmStruct *tms); |
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void (*Free)(MEM_PTR pp); |
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}; |
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#endif |
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/* our list of conversion packages */ |
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extern struct tmPackage *tmPkg[TM_MAXPKG]; |
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extern int tmNumPkgs; /* number of registered packages */ |
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/**** Useful Macros ****/ |
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/* compute luminance from encoded value */ |
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#define tmLuminance(li) exp((li)/(double)TM_BRTSCALE) |
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/* does tone mapping need color matrix? */ |
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#define tmNeedMatrix(t) ((t)->monpri != (t)->inppri) |
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/* register a conversion package */ |
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#define tmRegPkg(pf) ( tmNumPkgs >= TM_MAXPKG ? -1 : \ |
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(tmPkg[tmNumPkgs] = (pf), tmNumPkgs++) ) |
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/* get the specific package's data */ |
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#define tmPkgData(t,i) ((t)->pd[i]!=NULL ? (t)->pd[i] : (*tmPkg[i]->Init)(t)) |
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/**** Library Function Calls ****/ |
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#ifdef NOPROTO |
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#ifdef NOPROTO |
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extern struct tmStruct *tmInit(), *tmPop(); |
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extern struct tmStruct *tmInit(), *tmPop(), *tmDup(); |
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extern void tmClearHisto(), tmDone(); |
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extern int tmSetSpace(), tmCvColors(), tmCvColrs(); |
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extern int tmAddHisto(), tmComputeMapping(), tmMapPixels(); |
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extern int |
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tmComputeMapping(double gamval, double Lddyn, double Ldmax); |
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/* |
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Compute tone mapping function. |
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Compute tone mapping function. This mapping will be used |
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in subsequent calls to tmMapPixels() until a new tone mapping |
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is computed. I.e., calls to tmAddHisto() have no immediate effect. |
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gamval - display gamma response (0. for default). |
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Lddyn - the display's dynamic range (0. for default). |
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char *fname, FILE *fp); |
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/* |
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Load Radiance picture and convert to tone mapping representation. |
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Memory for the luminance and chroma arrays is allocated using |
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malloc(3), and should be freed with free(3) when no longer needed. |
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Calls tmSetSpace() to calibrate input color space. |
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lpp - returned array of encoded luminances, English ordering. |
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lpp - returned array of encoded luminances, picture ordering. |
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cpp - returned array of encoded chrominances (Note 2). |
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xp, yp - returned picture dimensions. |
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fname - picture file name. |
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If fp is TM_GETFILE and (flags&TM_F_UNIMPL)!=0, tmMapPicture() |
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calls pcond to perform the actual conversion, which takes |
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longer but gives access to all the TM_F_* features. |
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Memory for the final pixel array is allocated using malloc(3), |
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and should be freed with free(3) when it is no longer needed. |
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psp - returned array of tone mapped pixels, English ordering. |
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psp - returned array of tone mapped pixels, picture ordering. |
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xp, yp - returned picture dimensions. |
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flags - TM_F_* flags indicating what is to be done. |
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monpri - display monitor primaries (Note 1). |
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returns - 0 on success, TM_E_* if tms is invalid. |
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*/ |
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extern struct tmStruct * |
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tmDup(void); |
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/* |
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Duplicate the current tone mapping into a new structure on the stack. |
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returns - pointer to new top, or NULL on error. |
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*/ |
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extern void |
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tmDone(struct tmStruct *tms); |
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/* |
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*/ |
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#endif |
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/**** Notes ****/ |
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/* |
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General: |
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pixel values to chroma and luminance encodings, which can |
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be passed to tmAddHisto() to put into the tone mapping histogram. |
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This histogram is then used along with the display parameters |
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by tmComputMapping() to compute the luminance mapping function. |
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by tmComputeMapping() to compute the luminance mapping function. |
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(Colors are tone-mapped as they are converted if TM_F_MESOPIC |
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is set.) The encoded chroma and luminance values may then be |
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passed to tmMapPixels() to apply the computed tone mapping in |
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used during final mapping, setting the cs parameter to TM_NOCHROM |
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on the first pass will save time.) Another memory saving option |
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if third and subsequent passes are not needed is to use the |
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same array to store the mapped pixels as is used to store |
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same array to store the mapped pixels as used to store |
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the encoded chroma values. This way, only two extra bytes |
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for storing encoded luminances are required per pixel. This |
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is the method employed by tmMapPicture(), for example. |