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/* Copyright (c) 1991 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* RCSid $Id$ */ |
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/* |
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* color.h - header for routines using pixel color values. |
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* |
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* 12/31/85 |
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* Must be included after X11 headers, since they declare a BYTE type. |
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* |
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* Two color representations are used, one for calculation and |
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* another for storage. Calculation is done with three floats |
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* for speed. Stored color values use 4 bytes which contain |
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* three single byte mantissas and a common exponent. |
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*/ |
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#ifndef _RAD_COLOR_H_ |
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#define _RAD_COLOR_H_ |
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#include <stdlib.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define RED 0 |
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#define GRN 1 |
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#define BLU 2 |
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#define COLXS 128 /* excess used for exponent */ |
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#define WHT 3 /* used for RGBPRIMS type */ |
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typedef unsigned char BYTE; /* 8-bit unsigned integer */ |
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#undef BYTE |
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#define BYTE unsigned char /* 8-bit unsigned integer */ |
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typedef BYTE COLR[4]; /* red, green, blue (or X,Y,Z), exponent */ |
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typedef float COLOR[3]; /* red, green, blue (or X,Y,Z) */ |
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typedef float COLORV; |
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typedef COLORV COLOR[3]; /* red, green, blue (or X,Y,Z) */ |
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typedef float RGBPRIMS[4][2]; /* (x,y) chromaticities for RGBW */ |
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typedef float (*RGBPRIMP)[2]; /* pointer to RGBPRIMS array */ |
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#define CIE_y_w 0.3333 |
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#endif |
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#define STDPRIMS {CIE_x_r,CIE_y_r,CIE_x_g,CIE_y_g, \ |
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CIE_x_b,CIE_y_b,CIE_x_w,CIE_y_w} |
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#define STDPRIMS {{CIE_x_r,CIE_y_r},{CIE_x_g,CIE_y_g}, \ |
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{CIE_x_b,CIE_y_b},{CIE_x_w,CIE_y_w}} |
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#define CIE_D ( CIE_x_r*(CIE_y_g - CIE_y_b) + \ |
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CIE_x_g*(CIE_y_b - CIE_y_r) + \ |
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#define D65EFFICACY 203. /* standard illuminant D65 */ |
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#define INCEFFICACY 160. /* illuminant A (incand.) */ |
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#define SUNEFFICACY 208. /* illuminant B (solar dir.) */ |
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#define SKYEFFICACY D65EFFICACY /* skylight */ |
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#define SKYEFFICACY D65EFFICACY /* skylight (should be 110) */ |
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#define DAYEFFICACY D65EFFICACY /* combined sky and solar */ |
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#define luminance(col) (WHTEFFICACY * bright(col)) |
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#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \ |
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(cc)[RED],(cc)[GRN],(cc)[BLU]) |
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#ifdef DCL_ATOF |
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extern double atof(), ldexp(), frexp(); |
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#endif |
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/* |
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* Conversions to and from XYZ space generally don't apply WHTEFFICACY. |
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* If you need Y to be luminance (cd/m^2), this must be applied when |
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* converting from radiance (watts/sr/m^2). |
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*/ |
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extern RGBPRIMS stdprims; /* standard primary chromaticities */ |
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extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */ |
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extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */ |
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extern RGBPRIMS stdprims; /* standard primary chromaticities */ |
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extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */ |
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extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */ |
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extern COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */ |
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#define cie_rgb(rgb,xyz) colortrans(rgb,xyz2rgbmat,xyz) |
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#define CGAMUT_LOWER 01 |
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#define CGAMUT_UPPER 02 |
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#define CGAMUT (CGAMUT_LOWER|CGAMUT_UPPER) |
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#define rgb_cie(xyz,rgb) colortrans(xyz,rgb2xyzmat,rgb) |
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#ifdef BSD |
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#define cpcolormat(md,ms) bcopy((char *)ms,(char *)md,sizeof(COLORMAT)) |
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#else |
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extern char *memcpy(); |
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#define cpcolormat(md,ms) (void)memcpy((char *)md,(char *)ms,sizeof(COLORMAT)) |
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#define cpcolormat(md,ms) memcpy((void *)md,(void *)ms,sizeof(COLORMAT)) |
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/* defined in color.c */ |
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extern char *tempbuffer(unsigned int len); |
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extern int fwritecolrs(COLR *scanline, int len, FILE *fp); |
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extern int freadcolrs(COLR *scanline, int len, FILE *fp); |
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extern int fwritescan(COLOR *scanline, int len, FILE *fp); |
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extern int freadscan(COLOR *scanline, int len, FILE *fp); |
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extern void setcolr(COLR clr, double r, double g, double b); |
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extern void colr_color(COLOR col, COLR clr); |
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extern int bigdiff(COLOR c1, COLOR c2, double md); |
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/* defined in spec_rgb.c */ |
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extern void spec_rgb(COLOR col, int s, int e); |
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extern void spec_cie(COLOR col, int s, int e); |
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extern void cie_rgb(COLOR rgb, COLOR xyz); |
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extern int clipgamut(COLOR col, double brt, int gamut, |
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COLOR lower, COLOR upper); |
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extern void colortrans(COLOR c2, COLORMAT mat, COLOR c1); |
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extern void multcolormat(COLORMAT m3, COLORMAT m2, |
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COLORMAT m1); |
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extern void compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr); |
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extern void comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr); |
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extern void comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
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extern void compxyzWBmat(COLORMAT mat, float wht1[2], |
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float wht2[2]); |
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extern void compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr); |
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extern void comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr); |
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extern void comprgb2rgbWBmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
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/* defined in colrops.c */ |
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extern int setcolrcor(double (*f)(double, double), double a2); |
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extern int setcolrinv(double (*f)(double, double), double a2); |
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extern int setcolrgam(double g); |
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extern int colrs_gambs(COLR *scan, int len); |
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extern int gambs_colrs(COLR *scan, int len); |
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extern void shiftcolrs(COLR *scan, int len, int adjust); |
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extern void normcolrs(COLR *scan, int len, int adjust); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _RAD_COLOR_H_ */ |
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