--- ray/src/common/color.h 1989/10/20 20:35:21 1.4 +++ ray/src/common/color.h 2003/07/30 10:11:06 2.26 @@ -1,33 +1,48 @@ -/* Copyright (c) 1986 Regents of the University of California */ - -/* SCCSid "$SunId$ LBL" */ - +/* RCSid $Id: color.h,v 2.26 2003/07/30 10:11:06 schorsch Exp $ */ /* * color.h - header for routines using pixel color values. * - * 12/31/85 + * 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. */ +#ifndef _RAD_COLOR_H_ +#define _RAD_COLOR_H_ +#include + +#ifdef __cplusplus +extern "C" { +#endif + #define RED 0 #define GRN 1 #define BLU 2 -#define EXP 3 +#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 */ -typedef unsigned char BYTE; /* 8-bit unsigned integer */ +#undef BYTE +#define BYTE unsigned char /* 8-bit unsigned integer */ -typedef BYTE COLR[4]; /* red, green, blue, exponent */ +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]) -typedef float COLOR[3]; /* red, green, blue */ - #define colval(col,pri) ((col)[pri]) #define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b)) @@ -40,8 +55,71 @@ typedef float COLOR[3]; /* red, green, blue */ #define multcolor(c1,c2) ((c1)[0]*=(c2)[0],(c1)[1]*=(c2)[1],(c1)[2]*=(c2)[2]) -#define bright(col) (.30*(col)[RED]+.59*(col)[GRN]+.11*(col)[BLU]) +#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] ) @@ -50,16 +128,115 @@ typedef float COLOR[3]; /* red, green, blue */ ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \ 0. ) -#define normbright(c) (int)((77L*(c)[RED]+151L*(c)[GRN]+28L*(c)[BLU])/256) - #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} - /* definitions for resolution header */ -#define XDECR 1 -#define YDECR 2 -#define YMAJOR 4 + /* 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 */ -extern double ldexp(); + /* 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) + +#define cpcolormat(md,ms) memcpy((void *)md,(void *)ms,sizeof(COLORMAT)) + + /* 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, double), double a2); +extern int setcolrinv(double (*f)(double, double), 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); + + +#ifdef __cplusplus +} +#endif +#endif /* _RAD_COLOR_H_ */ +