1 |
gwlarson |
3.8 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
greg |
3.1 |
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3 |
gwlarson |
3.8 |
/* SCCSid "$SunId$ SGI" */ |
4 |
greg |
3.1 |
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/* |
6 |
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* Header file for tone mapping functions. |
7 |
gwlarson |
3.8 |
* |
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* Include after "color.h" |
9 |
greg |
3.1 |
*/ |
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greg |
3.4 |
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12 |
greg |
3.1 |
/**** 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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greg |
3.2 |
#define TM_F_NOSTDERR 0400 /* don't report errors to stderr */ |
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greg |
3.1 |
/* 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 */ |
34 |
gwlarson |
3.8 |
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greg |
3.1 |
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36 |
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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 */ |
44 |
greg |
3.4 |
#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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greg |
3.1 |
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greg |
3.4 |
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greg |
3.1 |
/**** Conversion Constants and Table Sizes ****/ |
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#define TM_BRTSCALE 128 /* brightness scale factor (integer) */ |
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greg |
3.4 |
#define TM_MAXPKG 8 /* maximum number of color formats */ |
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greg |
3.1 |
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greg |
3.4 |
/**** 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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61 |
greg |
3.1 |
extern char *tmErrorMessage[]; /* error messages */ |
62 |
gregl |
3.6 |
extern int tmLastError; /* last error incurred by library */ |
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extern char *tmLastFunction; /* error-generating function name */ |
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greg |
3.1 |
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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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greg |
3.4 |
int cdiv[3]; /* computed color divisors */ |
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greg |
3.1 |
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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gregl |
3.7 |
TMbright hbrmin, hbrmax; /* histogram brightness limits */ |
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greg |
3.1 |
int *histo; /* input histogram */ |
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gregl |
3.7 |
TMbright mbrmin, mbrmax; /* mapped brightness limits */ |
80 |
greg |
3.1 |
unsigned short *lumap; /* computed luminance map */ |
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struct tmStruct *tmprev; /* previous tone mapping */ |
82 |
greg |
3.4 |
MEM_PTR pd[TM_MAXPKG]; /* pointers to private data */ |
83 |
greg |
3.1 |
} *tmTop; /* current tone mapping stack */ |
84 |
greg |
3.4 |
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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); |
96 |
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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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greg |
3.1 |
/**** Useful Macros ****/ |
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greg |
3.4 |
/* compute luminance from encoded value */ |
107 |
greg |
3.1 |
#define tmLuminance(li) exp((li)/(double)TM_BRTSCALE) |
108 |
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109 |
greg |
3.4 |
/* does tone mapping need color matrix? */ |
110 |
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#define tmNeedMatrix(t) ((t)->monpri != (t)->inppri) |
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112 |
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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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greg |
3.1 |
/**** Library Function Calls ****/ |
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122 |
greg |
3.4 |
#ifdef NOPROTO |
123 |
greg |
3.1 |
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124 |
greg |
3.3 |
extern struct tmStruct *tmInit(), *tmPop(), *tmDup(); |
125 |
greg |
3.1 |
extern void tmClearHisto(), tmDone(); |
126 |
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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(); |
129 |
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#else |
131 |
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132 |
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extern struct tmStruct * |
133 |
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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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*/ |
143 |
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144 |
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extern int |
145 |
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tmSetSpace(RGBPRIMP pri, double sf); |
146 |
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/* |
147 |
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Set color primaries and scale factor for incoming scanlines. |
148 |
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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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152 |
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returns - 0 on success, TM_E_* code on failure. |
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*/ |
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extern void |
156 |
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tmClearHisto(void); |
157 |
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/* |
158 |
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Clear histogram for current tone mapping. |
159 |
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*/ |
160 |
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161 |
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extern int |
162 |
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tmCvColors(TMbright *ls, BYTE *cs, COLOR *scan, int len); |
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/* |
164 |
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Convert RGB/XYZ float scanline to encoded luminance and chrominance. |
165 |
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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. |
170 |
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returns - 0 on success, TM_E_* on error. |
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*/ |
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174 |
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extern int |
175 |
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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. |
182 |
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len - scanline length. |
183 |
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184 |
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returns - 0 on success, TM_E_* on error. |
185 |
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*/ |
186 |
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187 |
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extern int |
188 |
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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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/* |
202 |
gregl |
3.7 |
Compute tone mapping function. This mapping will be used |
203 |
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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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greg |
3.1 |
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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. |
224 |
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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. |
231 |
greg |
3.5 |
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. |
233 |
greg |
3.3 |
Calls tmSetSpace() to calibrate input color space. |
234 |
greg |
3.1 |
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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. |
242 |
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*/ |
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extern int |
245 |
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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. |
254 |
greg |
3.5 |
Memory for the final pixel array is allocated using malloc(3), |
255 |
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and should be freed with free(3) when it is no longer needed. |
256 |
greg |
3.1 |
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257 |
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psp - returned array of tone mapped pixels, English ordering. |
258 |
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xp, yp - returned picture dimensions. |
259 |
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flags - TM_F_* flags indicating what is to be done. |
260 |
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monpri - display monitor primaries (Note 1). |
261 |
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gamval - display gamma response. |
262 |
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Lddyn - the display's dynamic range (0. for default). |
263 |
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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). |
266 |
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returns - 0 on success, TM_E_* on failure. |
268 |
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*/ |
269 |
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270 |
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extern struct tmStruct * |
271 |
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tmPop(void); |
272 |
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/* |
273 |
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Pops current tone mapping from stack. |
274 |
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275 |
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returns - pointer to tone mapping structure, or NULL if none. |
276 |
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*/ |
277 |
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278 |
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extern int |
279 |
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tmPull(struct tmStruct *tms); |
280 |
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/* |
281 |
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Pull tone mapping from anywhere in stack. |
282 |
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283 |
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tms - tone mapping structure to find. |
284 |
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285 |
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returns - 1 if found in stack, 0 otherwise. |
286 |
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*/ |
287 |
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288 |
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extern int |
289 |
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tmPush(struct tmStruct *tms); |
290 |
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/* |
291 |
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Make tone mapping active by (pulling it and) pushing it to the top. |
292 |
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293 |
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tms - initialized tone mapping structure. |
294 |
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295 |
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returns - 0 on success, TM_E_* if tms is invalid. |
296 |
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*/ |
297 |
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298 |
greg |
3.3 |
extern struct tmStruct * |
299 |
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tmDup(void); |
300 |
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/* |
301 |
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Duplicate the current tone mapping into a new structure on the stack. |
302 |
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303 |
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returns - pointer to new top, or NULL on error. |
304 |
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*/ |
305 |
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306 |
greg |
3.1 |
extern void |
307 |
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tmDone(struct tmStruct *tms); |
308 |
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/* |
309 |
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Free data associated with the given tone mapping structure. |
310 |
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Calls tmPull() first to remove it from the stack if present. |
311 |
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The calls tmDone(tmPop()), tmDone(tmTop) and tmDone(NULL) |
312 |
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all have the same effect, which is to remove and free |
313 |
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the current tone mapping. |
314 |
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315 |
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tms - tone mapping structure to free. |
316 |
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*/ |
317 |
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#endif |
319 |
greg |
3.4 |
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320 |
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321 |
greg |
3.1 |
/**** Notes ****/ |
322 |
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/* |
323 |
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General: |
324 |
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325 |
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The usual sequence after calling tmInit() is to convert some |
326 |
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pixel values to chroma and luminance encodings, which can |
327 |
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be passed to tmAddHisto() to put into the tone mapping histogram. |
328 |
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This histogram is then used along with the display parameters |
329 |
greg |
3.5 |
by tmComputeMapping() to compute the luminance mapping function. |
330 |
greg |
3.1 |
(Colors are tone-mapped as they are converted if TM_F_MESOPIC |
331 |
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is set.) The encoded chroma and luminance values may then be |
332 |
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passed to tmMapPixels() to apply the computed tone mapping in |
333 |
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a second pass. |
334 |
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Especially for RGBE colors in the same color space as the |
336 |
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target display, the conversion to chroma and luminance values |
337 |
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is fast enough that it may be recomputed on the second pass |
338 |
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if memory is at a premium. (Since the chroma values are only |
339 |
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used during final mapping, setting the cs parameter to TM_NOCHROM |
340 |
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on the first pass will save time.) Another memory saving option |
341 |
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if third and subsequent passes are not needed is to use the |
342 |
greg |
3.3 |
same array to store the mapped pixels as used to store |
343 |
greg |
3.1 |
the encoded chroma values. This way, only two extra bytes |
344 |
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for storing encoded luminances are required per pixel. This |
345 |
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is the method employed by tmMapPicture(), for example. |
346 |
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*/ |
347 |
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/* |
348 |
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Note 1: |
349 |
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350 |
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All RGBPRIMP values should be pointers to static structures. |
351 |
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I.e., the same pointer should be used for the same primaries, |
352 |
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and those primaries should not change from one call to the next. |
353 |
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This is because the routines use the pointer value to identify |
354 |
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computed conversion matrices, so the matrices do not have to be |
355 |
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rebuilt each time. If you are using the standard primaries, |
356 |
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use the standard primary pointer, stdprims. |
357 |
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358 |
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To indicate a set of input primaries are actually CIE XYZ, |
359 |
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the TM_XYZPRIM macro may be passed. If the input primaries |
360 |
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are unknown, it is wisest to pass tmTop->monpri to tmSetSpace(). |
361 |
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By default, the input primaries equal the monitor primaries |
362 |
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and the scalefactor is set to WHTEFFICACY in tmInit(). |
363 |
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*/ |
364 |
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/* |
365 |
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Note 2: |
366 |
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367 |
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Chrominance is optional in most of these routines, whether |
368 |
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TM_F_BW is set or not. Passing a value of TM_NOCHROM (or |
369 |
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TM_NOCHROMP for picture reading) indicates that returned |
370 |
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color values are not desired. |
371 |
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372 |
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If TM_NOCHROM is passed to a mapping routine expecting chroma |
373 |
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input, it will do without it and return luminance channel |
374 |
|
|
rather than RGB pixel values. Otherwise, the array for |
375 |
|
|
returned pixel values may be the same array used to pass |
376 |
|
|
encoded chrominances if no other mappings are desired. |
377 |
|
|
*/ |
378 |
|
|
/* |
379 |
|
|
Note 3: |
380 |
|
|
|
381 |
|
|
Picture files may either be opened by the calling routine or by |
382 |
|
|
the library function. If opened by the calling routine, the |
383 |
|
|
pointer to the stream is passed, which may be a pipe or other |
384 |
|
|
non-seekable input as it is only read once. It must be |
385 |
|
|
positioned at the beginning when the function is called, and it |
386 |
|
|
will be positioned at the end on return. It will not be closed. |
387 |
|
|
If the passed stream pointer is TM_GETFILE, then the library |
388 |
|
|
function will open the file, read its contents and close it |
389 |
|
|
before returning, whether or not an error was encountered. |
390 |
|
|
*/ |