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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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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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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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|
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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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|
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|
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/**** Error Return Values ****/ |
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|
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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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|
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|
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/**** Conversion Constants and Table Sizes ****/ |
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|
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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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|
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#define TM_MAXPKG 8 /* maximum number of color formats */ |
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|
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|
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/**** Global Data Types and Structures ****/ |
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|
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#ifndef MEM_PTR |
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#define MEM_PTR void * |
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#endif |
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|
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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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|
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typedef short TMbright; /* encoded luminance type */ |
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|
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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 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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|
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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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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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|
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|
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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)*(1./TM_BRTSCALE)) |
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|
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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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|
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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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|
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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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|
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|
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/**** Library Function Calls ****/ |
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|
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#ifdef NOPROTO |
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|
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extern struct tmStruct *tmInit(), *tmPop(), *tmDup(); |
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extern int tmSetSpace(), tmPull(), tmPush(); |
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extern void tmClearHisto(), tmDone(); |
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extern int tmAddHisto(); |
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extern int tmFixedMapping(), tmComputeMapping(), tmMapPixels(); |
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extern int tmCvColors(), tmCvGrays(), tmCvColrs(); |
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extern int tmLoadPicture(), tmMapPicture(); |
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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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Initialize new tone mapping and push it onto stack. |
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|
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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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|
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returns - new tmTop, or NULL if insufficient memory. |
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*/ |
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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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|
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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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|
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returns - 0 on success, TM_E_* code on failure. |
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*/ |
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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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|
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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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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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|
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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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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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|
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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 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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|
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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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|
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returns - 0 on success, TM_E_* on failure. |
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*/ |
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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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|
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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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|
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returns - 0 on success, TM_E_* on failure. |
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*/ |
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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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|
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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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|
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tms - tone mapping structure to find. |
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|
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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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|
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tms - initialized tone mapping structure. |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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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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|
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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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fp - pointer to open file (Note 3). |
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|
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returns - 0 on success, TM_E_* on failure. |
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*/ |
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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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|
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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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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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|
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returns - 0 on success, TM_E_* on failure. |
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*/ |
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|
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#endif |
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|
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|
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/**** Notes ****/ |
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/* |
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General: |
| 413 |
|
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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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|
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Especially for RGBE colors in the same color space as the |
| 425 |
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 |
| 427 |
if memory is at a premium. (Since the chroma values are only |
| 428 |
used during final mapping, setting the cs parameter to TM_NOCHROM |
| 429 |
on the first pass will save time.) Another memory saving option |
| 430 |
if third and subsequent passes are not needed is to use the |
| 431 |
same array to store the mapped pixels as used to store |
| 432 |
the encoded chroma values. This way, only two extra bytes |
| 433 |
for storing encoded luminances are required per pixel. This |
| 434 |
is the method employed by tmMapPicture(), for example. |
| 435 |
*/ |
| 436 |
/* |
| 437 |
Note 1: |
| 438 |
|
| 439 |
All RGBPRIMP values should be pointers to static structures. |
| 440 |
I.e., the same pointer should be used for the same primaries, |
| 441 |
and those primaries should not change from one call to the next. |
| 442 |
This is because the routines use the pointer value to identify |
| 443 |
computed conversion matrices, so the matrices do not have to be |
| 444 |
rebuilt each time. If you are using the standard primaries, |
| 445 |
use the standard primary pointer, stdprims. |
| 446 |
|
| 447 |
To indicate a set of input primaries are actually CIE XYZ, |
| 448 |
the TM_XYZPRIM macro may be passed. If the input primaries |
| 449 |
are unknown, it is wisest to pass tmTop->monpri to tmSetSpace(). |
| 450 |
By default, the input primaries equal the monitor primaries |
| 451 |
and the scalefactor is set to WHTEFFICACY in tmInit(). |
| 452 |
*/ |
| 453 |
/* |
| 454 |
Note 2: |
| 455 |
|
| 456 |
Chrominance is optional in most of these routines, whether |
| 457 |
TM_F_BW is set or not. Passing a value of TM_NOCHROM (or |
| 458 |
TM_NOCHROMP for picture reading) indicates that returned |
| 459 |
color values are not desired. |
| 460 |
|
| 461 |
If TM_NOCHROM is passed to a mapping routine expecting chroma |
| 462 |
input, it will do without it and return luminance channel |
| 463 |
rather than RGB pixel values. Otherwise, the array for |
| 464 |
returned pixel values may be the same array used to pass |
| 465 |
encoded chrominances if no other mappings are desired. |
| 466 |
*/ |
| 467 |
/* |
| 468 |
Note 3: |
| 469 |
|
| 470 |
Picture files may either be opened by the calling routine or by |
| 471 |
the library function. If opened by the calling routine, the |
| 472 |
pointer to the stream is passed, which may be a pipe or other |
| 473 |
non-seekable input as it is only read once. It must be |
| 474 |
positioned at the beginning when the function is called, and it |
| 475 |
will be positioned at the end on return. It will not be closed. |
| 476 |
If the passed stream pointer is TM_GETFILE, then the library |
| 477 |
function will open the file, read its contents and close it |
| 478 |
before returning, whether or not an error was encountered. |
| 479 |
*/ |
| 480 |
|
| 481 |
#ifdef __cplusplus |
| 482 |
} |
| 483 |
#endif |
