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/* Copyright (c) 1997 Regents of the University of California */
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/* SCCSid "$SunId$ LBL" */
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/*
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* Header file for tone mapping functions.
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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_F_MESOPIC 02 /* mesopic color sensitivity */
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#define TM_F_LINEAR 04 /* linear brightness mapping */
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#define TM_F_ACUITY 010 /* acuity adjustment */
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#define TM_F_VEIL 020 /* veiling glare */
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#define TM_F_CWEIGHT 040 /* center weighting */
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#define TM_F_FOVEAL 0100 /* use foveal sample size */
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#define TM_F_BW 0200 /* luminance only */
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#define TM_F_NOSTDERR 0400 /* don't report errors to stderr */
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/* combined modes */
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#define TM_F_CAMERA 0
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#define TM_F_HUMAN (TM_F_HCONTR|TM_F_MESOPIC|TM_F_VEIL|\
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TM_F_ACUITY|TM_F_FOVEAL)
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#define TM_F_UNIMPL (TM_F_CWEIGHT|TM_F_VEIL|TM_F_ACUITY|TM_F_FOVEAL)
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/* special pointer values */
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#define TM_XYZPRIM (RGBPRIMP)NULL /* indicate XYZ primaries (Note 1) */
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#define TM_NOCHROM (BYTE *)NULL /* indicate no chrominance */
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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_NOMEM 1 /* out of memory */
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#define TM_E_ILLEGAL 2 /* illegal argument value */
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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_MAXPKG 8 /* maximum number of color formats */
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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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/* basic tone mapping data structure */
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extern struct tmStruct {
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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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COLOR clf; /* computed luminance coefficients */
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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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COLORMAT cmat; /* color conversion matrix */
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TMbright brmin, brmax; /* input brightness limits */
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int *histo; /* input histogram */
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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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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 tmLoadPicture(), tmMapPicture(), tmPull(), tmPush();
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#else
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extern struct tmStruct *
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tmInit(int flags, RGBPRIMP monpri, double gamval);
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/*
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Initialize new tone mapping and push it onto stack.
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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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gamval - display gamma response (can be approximate).
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returns - new tmTop, or NULL if insufficient memory.
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*/
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extern int
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tmSetSpace(RGBPRIMP pri, double sf);
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/*
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Set color primaries and scale factor for incoming scanlines.
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pri - RGB color input primaries (Note 1).
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sf - scale factor to get to luminance in cd/m^2.
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returns - 0 on success, TM_E_* code on failure.
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*/
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extern void
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tmClearHisto(void);
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/*
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Clear histogram for current tone mapping.
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*/
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extern int
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tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len);
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/*
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Convert RGB/XYZ float scanline to encoded luminance and chrominance.
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ls - returned encoded luminance values.
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cs - returned encoded chrominance values (Note 2).
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scan - input scanline.
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len - scanline length.
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returns - 0 on success, TM_E_* on error.
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*/
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extern int
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tmCvColrs(TMbright *ls, BYTE *cs, COLR *scan, int len);
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/*
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Convert RGBE/XYZE scanline to encoded luminance and chrominance.
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ls - returned encoded luminance values.
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cs - returned encoded chrominance values (Note 2).
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scan - input scanline.
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len - scanline length.
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returns - 0 on success, TM_E_* on error.
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*/
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extern int
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tmAddHisto(TMbright *ls, int len, int wt);
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/*
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Add brightness values to current histogram.
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ls - encoded luminance values.
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len - number of luminance values.
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wt - integer weight to use for each value (usually 1 or -1).
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returns - 0 on success, TM_E_* on error.
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*/
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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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gamval - display gamma response (0. for default).
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Lddyn - the display's dynamic range (0. for default).
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Ldmax - maximum display luminance in cd/m^2 (0. for default).
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returns - 0 on success, TM_E_* on failure.
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*/
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extern int
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tmMapPixels(BYTE *ps, TMbright *ls, BYTE *cs, int len);
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/*
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Apply tone mapping function to pixel values.
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ps - returned pixel values (Note 2).
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ls - encoded luminance values.
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cs - encoded chrominance values (Note 2).
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len - number of pixels.
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returns - 0 on success, TM_E_* on failure.
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*/
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extern int
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tmLoadPicture(TMbright **lpp, BYTE **cpp, int *xp, int *yp,
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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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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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fp - pointer to open file (Note 3).
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returns - 0 on success, TM_E_* on failure.
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*/
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extern int
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tmMapPicture(BYTE **psp, int *xp, int *yp, int flags,
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RGBPRIMP monpri, double gamval, double Lddyn, double Ldmax,
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char *fname, FILE *fp);
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/*
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Load and apply tone mapping to Radiance picture.
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Stack is restored to its original state upon return.
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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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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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gamval - display gamma response.
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Lddyn - the display's dynamic range (0. for default).
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Ldmax - maximum display luminance in cd/m^2 (0. for default).
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fname - picture file name.
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fp - pointer to open file (Note 3).
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returns - 0 on success, TM_E_* on failure.
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*/
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extern struct tmStruct *
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tmPop(void);
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/*
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Pops current tone mapping from stack.
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returns - pointer to tone mapping structure, or NULL if none.
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*/
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extern int
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tmPull(struct tmStruct *tms);
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/*
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Pull tone mapping from anywhere in stack.
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tms - tone mapping structure to find.
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returns - 1 if found in stack, 0 otherwise.
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*/
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extern int
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tmPush(struct tmStruct *tms);
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/*
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Make tone mapping active by (pulling it and) pushing it to the top.
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tms - initialized tone mapping structure.
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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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Free data associated with the given tone mapping structure.
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Calls tmPull() first to remove it from the stack if present.
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The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL)
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all have the same effect, which is to remove and free
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the current tone mapping.
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tms - tone mapping structure to free.
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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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The usual sequence after calling tmInit() is to convert some
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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 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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a second pass.
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Especially for RGBE colors in the same color space as the
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target display, the conversion to chroma and luminance values
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is fast enough that it may be recomputed on the second pass
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if memory is at a premium. (Since the chroma values are only
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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 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.
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*/
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/*
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Note 1:
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All RGBPRIMP values should be pointers to static structures.
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I.e., the same pointer should be used for the same primaries,
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and those primaries should not change from one call to the next.
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This is because the routines use the pointer value to identify
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computed conversion matrices, so the matrices do not have to be
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rebuilt each time. If you are using the standard primaries,
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use the standard primary pointer, stdprims.
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To indicate a set of input primaries are actually CIE XYZ,
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the TM_XYZPRIM macro may be passed. If the input primaries
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are unknown, it is wisest to pass tmTop->monpri to tmSetSpace().
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By default, the input primaries equal the monitor primaries
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and the scalefactor is set to WHTEFFICACY in tmInit().
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*/
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/*
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Note 2:
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Chrominance is optional in most of these routines, whether
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TM_F_BW is set or not. Passing a value of TM_NOCHROM (or
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TM_NOCHROMP for picture reading) indicates that returned
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color values are not desired.
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If TM_NOCHROM is passed to a mapping routine expecting chroma
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input, it will do without it and return luminance channel
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rather than RGB pixel values. Otherwise, the array for
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returned pixel values may be the same array used to pass
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encoded chrominances if no other mappings are desired.
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*/
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/*
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Note 3:
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Picture files may either be opened by the calling routine or by
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the library function. If opened by the calling routine, the
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pointer to the stream is passed, which may be a pipe or other
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non-seekable input as it is only read once. It must be
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positioned at the beginning when the function is called, and it
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will be positioned at the end on return. It will not be closed.
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If the passed stream pointer is TM_GETFILE, then the library
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function will open the file, read its contents and close it
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before returning, whether or not an error was encountered.
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*/
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