/* RCSid: $Id: color.h,v 2.18 2003/02/22 02:07:22 greg Exp $ */
/*
* color.h - header for routines using pixel color values.
*
* Must be included after X11 headers, since they declare a BYTE type.
*
* Two color representations are used, one for calculation and
* another for storage. Calculation is done with three floats
* for speed. Stored color values use 4 bytes which contain
* three single byte mantissas and a common exponent.
*/
/* ====================================================================
* The Radiance Software License, Version 1.0
*
* Copyright (c) 1990 - 2002 The Regents of the University of California,
* through Lawrence Berkeley National Laboratory. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes Radiance software
* (http://radsite.lbl.gov/)
* developed by the Lawrence Berkeley National Laboratory
* (http://www.lbl.gov/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
* and "The Regents of the University of California" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact radiance@radsite.lbl.gov.
*
* 5. Products derived from this software may not be called "Radiance",
* nor may "Radiance" appear in their name, without prior written
* permission of Lawrence Berkeley National Laboratory.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of Lawrence Berkeley National Laboratory. For more
* information on Lawrence Berkeley National Laboratory, please see
* .
*/
#include
#include
#ifdef __cplusplus
extern "C" {
#endif
#define RED 0
#define GRN 1
#define BLU 2
#define CIEX 0 /* or, if input is XYZ... */
#define CIEY 1
#define CIEZ 2
#define EXP 3 /* exponent same for either format */
#define COLXS 128 /* excess used for exponent */
#define WHT 3 /* used for RGBPRIMS type */
#undef BYTE
#define BYTE unsigned char /* 8-bit unsigned integer */
typedef BYTE COLR[4]; /* red, green, blue (or X,Y,Z), exponent */
typedef float COLOR[3]; /* red, green, blue (or X,Y,Z) */
typedef float RGBPRIMS[4][2]; /* (x,y) chromaticities for RGBW */
typedef float (*RGBPRIMP)[2]; /* pointer to RGBPRIMS array */
typedef float COLORMAT[3][3]; /* color coordinate conversion matrix */
#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \
c1[2]=c2[2],c1[3]=c2[3])
#define colval(col,pri) ((col)[pri])
#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b))
#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2])
#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf))
#define addcolor(c1,c2) ((c1)[0]+=(c2)[0],(c1)[1]+=(c2)[1],(c1)[2]+=(c2)[2])
#define multcolor(c1,c2) ((c1)[0]*=(c2)[0],(c1)[1]*=(c2)[1],(c1)[2]*=(c2)[2])
#ifdef NTSC
#define CIE_x_r 0.670 /* standard NTSC primaries */
#define CIE_y_r 0.330
#define CIE_x_g 0.210
#define CIE_y_g 0.710
#define CIE_x_b 0.140
#define CIE_y_b 0.080
#define CIE_x_w 0.3333 /* use true white */
#define CIE_y_w 0.3333
#else
#define CIE_x_r 0.640 /* nominal CRT primaries */
#define CIE_y_r 0.330
#define CIE_x_g 0.290
#define CIE_y_g 0.600
#define CIE_x_b 0.150
#define CIE_y_b 0.060
#define CIE_x_w 0.3333 /* use true white */
#define CIE_y_w 0.3333
#endif
#define STDPRIMS {{CIE_x_r,CIE_y_r},{CIE_x_g,CIE_y_g}, \
{CIE_x_b,CIE_y_b},{CIE_x_w,CIE_y_w}}
#define CIE_D ( CIE_x_r*(CIE_y_g - CIE_y_b) + \
CIE_x_g*(CIE_y_b - CIE_y_r) + \
CIE_x_b*(CIE_y_r - CIE_y_g) )
#define CIE_C_rD ( (1./CIE_y_w) * \
( CIE_x_w*(CIE_y_g - CIE_y_b) - \
CIE_y_w*(CIE_x_g - CIE_x_b) + \
CIE_x_g*CIE_y_b - CIE_x_b*CIE_y_g ) )
#define CIE_C_gD ( (1./CIE_y_w) * \
( CIE_x_w*(CIE_y_b - CIE_y_r) - \
CIE_y_w*(CIE_x_b - CIE_x_r) - \
CIE_x_r*CIE_y_b + CIE_x_b*CIE_y_r ) )
#define CIE_C_bD ( (1./CIE_y_w) * \
( CIE_x_w*(CIE_y_r - CIE_y_g) - \
CIE_y_w*(CIE_x_r - CIE_x_g) + \
CIE_x_r*CIE_y_g - CIE_x_g*CIE_y_r ) )
#define CIE_rf (CIE_y_r*CIE_C_rD/CIE_D)
#define CIE_gf (CIE_y_g*CIE_C_gD/CIE_D)
#define CIE_bf (CIE_y_b*CIE_C_bD/CIE_D)
/* As of 9-94, CIE_rf=.265074126, CIE_gf=.670114631 and CIE_bf=.064811243 */
/***** The following definitions are valid for RGB colors only... *****/
#define bright(col) (CIE_rf*(col)[RED]+CIE_gf*(col)[GRN]+CIE_bf*(col)[BLU])
#define normbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[RED] + \
(long)(CIE_gf*256.+.5)*(c)[GRN] + \
(long)(CIE_bf*256.+.5)*(c)[BLU] ) >> 8 )
/* luminous efficacies over visible spectrum */
#define MAXEFFICACY 683. /* defined maximum at 550 nm */
#define WHTEFFICACY 179. /* uniform white light */
#define D65EFFICACY 203. /* standard illuminant D65 */
#define INCEFFICACY 160. /* illuminant A (incand.) */
#define SUNEFFICACY 208. /* illuminant B (solar dir.) */
#define SKYEFFICACY D65EFFICACY /* skylight */
#define DAYEFFICACY D65EFFICACY /* combined sky and solar */
#define luminance(col) (WHTEFFICACY * bright(col))
/***** ...end of stuff specific to RGB colors *****/
#define intens(col) ( (col)[0] > (col)[1] \
? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \
: (col)[1] > (col)[2] ? (col)[1] : (col)[2] )
#define colrval(c,p) ( (c)[EXP] ? \
ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \
0. )
#define WHTCOLOR {1.0,1.0,1.0}
#define BLKCOLOR {0.0,0.0,0.0}
#define WHTCOLR {128,128,128,COLXS+1}
#define BLKCOLR {0,0,0,0}
/* picture format identifier */
#define COLRFMT "32-bit_rle_rgbe"
#define CIEFMT "32-bit_rle_xyze"
#define PICFMT "32-bit_rle_???e" /* matches either */
#define LPICFMT 15 /* max format id len */
/* macros for exposures */
#define EXPOSSTR "EXPOSURE="
#define LEXPOSSTR 9
#define isexpos(hl) (!strncmp(hl,EXPOSSTR,LEXPOSSTR))
#define exposval(hl) atof((hl)+LEXPOSSTR)
#define fputexpos(ex,fp) fprintf(fp,"%s%e\n",EXPOSSTR,ex)
/* macros for pixel aspect ratios */
#define ASPECTSTR "PIXASPECT="
#define LASPECTSTR 10
#define isaspect(hl) (!strncmp(hl,ASPECTSTR,LASPECTSTR))
#define aspectval(hl) atof((hl)+LASPECTSTR)
#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa)
/* macros for primary specifications */
#define PRIMARYSTR "PRIMARIES="
#define LPRIMARYSTR 10
#define isprims(hl) (!strncmp(hl,PRIMARYSTR,LPRIMARYSTR))
#define primsval(p,hl) sscanf(hl+LPRIMARYSTR, \
"%f %f %f %f %f %f %f %f", \
&(p)[RED][CIEX],&(p)[RED][CIEY], \
&(p)[GRN][CIEX],&(p)[GRN][CIEY], \
&(p)[BLU][CIEX],&(p)[BLU][CIEY], \
&(p)[WHT][CIEX],&(p)[WHT][CIEY])
#define fputprims(p,fp) fprintf(fp, \
"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",\
PRIMARYSTR, \
(p)[RED][CIEX],(p)[RED][CIEY], \
(p)[GRN][CIEX],(p)[GRN][CIEY], \
(p)[BLU][CIEX],(p)[BLU][CIEY], \
(p)[WHT][CIEX],(p)[WHT][CIEY])
/* macros for color correction */
#define COLCORSTR "COLORCORR="
#define LCOLCORSTR 10
#define iscolcor(hl) (!strncmp(hl,COLCORSTR,LCOLCORSTR))
#define colcorval(cc,hl) sscanf(hl+LCOLCORSTR,"%f %f %f", \
&(cc)[RED],&(cc)[GRN],&(cc)[BLU])
#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \
(cc)[RED],(cc)[GRN],(cc)[BLU])
/*
* Conversions to and from XYZ space generally don't apply WHTEFFICACY.
* If you need Y to be luminance (cd/m^2), this must be applied when
* converting from radiance (watts/sr/m^2).
*/
extern RGBPRIMS stdprims; /* standard primary chromaticities */
extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */
extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */
extern COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */
#define CGAMUT_LOWER 01
#define CGAMUT_UPPER 02
#define CGAMUT (CGAMUT_LOWER|CGAMUT_UPPER)
#define rgb_cie(xyz,rgb) colortrans(xyz,rgb2xyzmat,rgb)
#ifdef BSD
#define cpcolormat(md,ms) bcopy((char *)ms,(char *)md,sizeof(COLORMAT))
#else
#define cpcolormat(md,ms) memcpy((char *)md,(char *)ms,sizeof(COLORMAT))
#endif
#ifdef NOPROTO
/* defined in color.c */
extern char *tempbuffer();
extern int fwritecolrs();
extern int freadcolrs();
extern int fwritescan();
extern int freadscan();
extern void setcolr();
extern void colr_color();
extern int bigdiff();
/* defined in spec_rgb.c */
extern void spec_rgb();
extern void spec_cie();
extern void cie_rgb();
extern int clipgamut();
extern void colortrans();
extern void multcolormat();
extern void compxyz2rgbmat();
extern void comprgb2xyzmat();
extern void comprgb2rgbmat();
extern void compxyzWBmat();
extern void compxyz2rgbWBmat();
extern void comprgb2xyzWBmat();
extern void comprgb2rgbWBmat();
/* defined in colrops.c */
extern int setcolrcor();
extern int setcolrinv();
extern int setcolrgam();
extern int colrs_gambs();
extern int gambs_colrs();
extern void shiftcolrs();
extern void normcolrs();
#else
/* defined in color.c */
extern char *tempbuffer(unsigned int len);
extern int fwritecolrs(COLR *scanline, int len, FILE *fp);
extern int freadcolrs(COLR *scanline, int len, FILE *fp);
extern int fwritescan(COLOR *scanline, int len, FILE *fp);
extern int freadscan(COLOR *scanline, int len, FILE *fp);
extern void setcolr(COLR clr, double r, double g, double b);
extern void colr_color(COLOR col, COLR clr);
extern int bigdiff(COLOR c1, COLOR c2, double md);
/* defined in spec_rgb.c */
extern void spec_rgb(COLOR col, int s, int e);
extern void spec_cie(COLOR col, int s, int e);
extern void cie_rgb(COLOR rgb, COLOR xyz);
extern int clipgamut(COLOR col, double brt, int gamut,
COLOR lower, COLOR upper);
extern void colortrans(COLOR c2, COLORMAT mat, COLOR c1);
extern void multcolormat(COLORMAT m3, COLORMAT m2,
COLORMAT m1);
extern void compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr);
extern void comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr);
extern void comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2);
extern void compxyzWBmat(COLORMAT mat, float wht1[2],
float wht2[2]);
extern void compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr);
extern void comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr);
extern void comprgb2rgbWBmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2);
/* defined in colrops.c */
extern int setcolrcor(double (*f)(), double a2);
extern int setcolrinv(double (*f)(), double a2);
extern int setcolrgam(double g);
extern int colrs_gambs(COLR *scan, int len);
extern int gambs_colrs(COLR *scan, int len);
extern void shiftcolrs(COLR *scan, int len, int adjust);
extern void normcolrs(COLR *scan, int len, int adjust);
#endif
#ifdef __cplusplus
}
#endif