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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* RCSid $Id$ */ |
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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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#ifndef _RAD_TONEMAP_H_ |
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#define _RAD_TONEMAP_H_ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#include "tifftypes.h" |
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/**** Argument Macros ****/ |
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/* Flags of what to do */ |
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#define TM_BRTSCALE 128 /* brightness scale factor (integer) */ |
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|
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#define TM_NOBRT (-1<<15) /* bogus brightness value */ |
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#define TM_NOLUM (1e-17) /* ridiculously small luminance */ |
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#define TM_MAXPKG 8 /* maximum number of color formats */ |
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|
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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 (*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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|
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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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#define tmLuminance(li) exp((li)*(1./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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/**** 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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|
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#else |
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|
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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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*/ |
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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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|
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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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|
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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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|
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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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*/ |
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extern int |
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tmFixedMapping(double expmult, double gamval); |
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/* |
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Assign a fixed, linear tone-mapping using the given multiplier, |
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which is the ratio of maximum output to uncalibrated input. |
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This mapping will be used in subsequent calls to tmMapPixels() |
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until a new tone mapping is computed. |
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Only the min. and max. values are used from the histogram. |
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expmult - the fixed exposure multiplier to use. |
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gamval - display gamma response (0. for default). |
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returns - 0 on success, TM_E_* on error. |
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*/ |
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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. 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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Compute tone mapping function from the current histogram. |
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This mapping will be used in subsequent calls to tmMapPixels() |
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until a new tone mapping is computed. |
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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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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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extern int |
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tmCvGrays(TMbright *ls, float *scan, int len); |
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/* |
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Convert gray float scanline to encoded luminance. |
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ls - returned encoded luminance values. |
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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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|
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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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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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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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tmCvRGB48(TMbright *ls, BYTE *cs, uint16 (*scan)[3], int len, double gv); |
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/* |
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Pull tone mapping from anywhere in stack. |
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Convert 48-bit RGB scanline to encoded luminance and chrominance. |
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tms - tone mapping structure to find. |
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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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gv - input gamma value. |
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returns - 1 if found in stack, 0 otherwise. |
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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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tmPush(struct tmStruct *tms); |
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tmCvGray16(TMbright *ls, uint16 *scan, int len, double gv); |
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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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Convert 16-bit gray scanline to encoded luminance. |
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tms - initialized tone mapping structure. |
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ls - returned encoded luminance values. |
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scan - input scanline. |
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len - scanline length. |
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gv - input gamma value. |
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returns - 0 on success, TM_E_* if tms is invalid. |
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returns - 0 on success, TM_E_* on error. |
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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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|
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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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|
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tms - tone mapping structure to free. |
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*/ |
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#endif |
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|
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/**** Notes ****/ |
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/* |
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General: |
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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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|
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _RAD_TONEMAP_H_ */ |
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