| 1 |
/* RCSid $Id$ */ |
| 2 |
/* |
| 3 |
* color.h - header for routines using pixel color values. |
| 4 |
* |
| 5 |
* Must be included after X11 headers, since they declare a BYTE type. |
| 6 |
* |
| 7 |
* Two color representations are used, one for calculation and |
| 8 |
* another for storage. Calculation is done with three floats |
| 9 |
* for speed. Stored color values use 4 bytes which contain |
| 10 |
* three single byte mantissas and a common exponent. |
| 11 |
*/ |
| 12 |
|
| 13 |
#include "copyright.h" |
| 14 |
|
| 15 |
#include <stdio.h> |
| 16 |
#include <stdlib.h> |
| 17 |
|
| 18 |
#ifdef __cplusplus |
| 19 |
extern "C" { |
| 20 |
#endif |
| 21 |
|
| 22 |
#define RED 0 |
| 23 |
#define GRN 1 |
| 24 |
#define BLU 2 |
| 25 |
#define CIEX 0 /* or, if input is XYZ... */ |
| 26 |
#define CIEY 1 |
| 27 |
#define CIEZ 2 |
| 28 |
#define EXP 3 /* exponent same for either format */ |
| 29 |
#define COLXS 128 /* excess used for exponent */ |
| 30 |
#define WHT 3 /* used for RGBPRIMS type */ |
| 31 |
|
| 32 |
#undef BYTE |
| 33 |
#define BYTE unsigned char /* 8-bit unsigned integer */ |
| 34 |
|
| 35 |
typedef BYTE COLR[4]; /* red, green, blue (or X,Y,Z), exponent */ |
| 36 |
|
| 37 |
typedef float COLOR[3]; /* red, green, blue (or X,Y,Z) */ |
| 38 |
|
| 39 |
typedef float RGBPRIMS[4][2]; /* (x,y) chromaticities for RGBW */ |
| 40 |
typedef float (*RGBPRIMP)[2]; /* pointer to RGBPRIMS array */ |
| 41 |
|
| 42 |
typedef float COLORMAT[3][3]; /* color coordinate conversion matrix */ |
| 43 |
|
| 44 |
#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \ |
| 45 |
c1[2]=c2[2],c1[3]=c2[3]) |
| 46 |
|
| 47 |
#define colval(col,pri) ((col)[pri]) |
| 48 |
|
| 49 |
#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b)) |
| 50 |
|
| 51 |
#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2]) |
| 52 |
|
| 53 |
#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf)) |
| 54 |
|
| 55 |
#define addcolor(c1,c2) ((c1)[0]+=(c2)[0],(c1)[1]+=(c2)[1],(c1)[2]+=(c2)[2]) |
| 56 |
|
| 57 |
#define multcolor(c1,c2) ((c1)[0]*=(c2)[0],(c1)[1]*=(c2)[1],(c1)[2]*=(c2)[2]) |
| 58 |
|
| 59 |
#ifdef NTSC |
| 60 |
#define CIE_x_r 0.670 /* standard NTSC primaries */ |
| 61 |
#define CIE_y_r 0.330 |
| 62 |
#define CIE_x_g 0.210 |
| 63 |
#define CIE_y_g 0.710 |
| 64 |
#define CIE_x_b 0.140 |
| 65 |
#define CIE_y_b 0.080 |
| 66 |
#define CIE_x_w 0.3333 /* use true white */ |
| 67 |
#define CIE_y_w 0.3333 |
| 68 |
#else |
| 69 |
#define CIE_x_r 0.640 /* nominal CRT primaries */ |
| 70 |
#define CIE_y_r 0.330 |
| 71 |
#define CIE_x_g 0.290 |
| 72 |
#define CIE_y_g 0.600 |
| 73 |
#define CIE_x_b 0.150 |
| 74 |
#define CIE_y_b 0.060 |
| 75 |
#define CIE_x_w 0.3333 /* use true white */ |
| 76 |
#define CIE_y_w 0.3333 |
| 77 |
#endif |
| 78 |
|
| 79 |
#define STDPRIMS {{CIE_x_r,CIE_y_r},{CIE_x_g,CIE_y_g}, \ |
| 80 |
{CIE_x_b,CIE_y_b},{CIE_x_w,CIE_y_w}} |
| 81 |
|
| 82 |
#define CIE_D ( CIE_x_r*(CIE_y_g - CIE_y_b) + \ |
| 83 |
CIE_x_g*(CIE_y_b - CIE_y_r) + \ |
| 84 |
CIE_x_b*(CIE_y_r - CIE_y_g) ) |
| 85 |
#define CIE_C_rD ( (1./CIE_y_w) * \ |
| 86 |
( CIE_x_w*(CIE_y_g - CIE_y_b) - \ |
| 87 |
CIE_y_w*(CIE_x_g - CIE_x_b) + \ |
| 88 |
CIE_x_g*CIE_y_b - CIE_x_b*CIE_y_g ) ) |
| 89 |
#define CIE_C_gD ( (1./CIE_y_w) * \ |
| 90 |
( CIE_x_w*(CIE_y_b - CIE_y_r) - \ |
| 91 |
CIE_y_w*(CIE_x_b - CIE_x_r) - \ |
| 92 |
CIE_x_r*CIE_y_b + CIE_x_b*CIE_y_r ) ) |
| 93 |
#define CIE_C_bD ( (1./CIE_y_w) * \ |
| 94 |
( CIE_x_w*(CIE_y_r - CIE_y_g) - \ |
| 95 |
CIE_y_w*(CIE_x_r - CIE_x_g) + \ |
| 96 |
CIE_x_r*CIE_y_g - CIE_x_g*CIE_y_r ) ) |
| 97 |
|
| 98 |
#define CIE_rf (CIE_y_r*CIE_C_rD/CIE_D) |
| 99 |
#define CIE_gf (CIE_y_g*CIE_C_gD/CIE_D) |
| 100 |
#define CIE_bf (CIE_y_b*CIE_C_bD/CIE_D) |
| 101 |
|
| 102 |
/* As of 9-94, CIE_rf=.265074126, CIE_gf=.670114631 and CIE_bf=.064811243 */ |
| 103 |
|
| 104 |
/***** The following definitions are valid for RGB colors only... *****/ |
| 105 |
|
| 106 |
#define bright(col) (CIE_rf*(col)[RED]+CIE_gf*(col)[GRN]+CIE_bf*(col)[BLU]) |
| 107 |
#define normbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[RED] + \ |
| 108 |
(long)(CIE_gf*256.+.5)*(c)[GRN] + \ |
| 109 |
(long)(CIE_bf*256.+.5)*(c)[BLU] ) >> 8 ) |
| 110 |
|
| 111 |
/* luminous efficacies over visible spectrum */ |
| 112 |
#define MAXEFFICACY 683. /* defined maximum at 550 nm */ |
| 113 |
#define WHTEFFICACY 179. /* uniform white light */ |
| 114 |
#define D65EFFICACY 203. /* standard illuminant D65 */ |
| 115 |
#define INCEFFICACY 160. /* illuminant A (incand.) */ |
| 116 |
#define SUNEFFICACY 208. /* illuminant B (solar dir.) */ |
| 117 |
#define SKYEFFICACY D65EFFICACY /* skylight */ |
| 118 |
#define DAYEFFICACY D65EFFICACY /* combined sky and solar */ |
| 119 |
|
| 120 |
#define luminance(col) (WHTEFFICACY * bright(col)) |
| 121 |
|
| 122 |
/***** ...end of stuff specific to RGB colors *****/ |
| 123 |
|
| 124 |
#define intens(col) ( (col)[0] > (col)[1] \ |
| 125 |
? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \ |
| 126 |
: (col)[1] > (col)[2] ? (col)[1] : (col)[2] ) |
| 127 |
|
| 128 |
#define colrval(c,p) ( (c)[EXP] ? \ |
| 129 |
ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \ |
| 130 |
0. ) |
| 131 |
|
| 132 |
#define WHTCOLOR {1.0,1.0,1.0} |
| 133 |
#define BLKCOLOR {0.0,0.0,0.0} |
| 134 |
#define WHTCOLR {128,128,128,COLXS+1} |
| 135 |
#define BLKCOLR {0,0,0,0} |
| 136 |
|
| 137 |
/* picture format identifier */ |
| 138 |
#define COLRFMT "32-bit_rle_rgbe" |
| 139 |
#define CIEFMT "32-bit_rle_xyze" |
| 140 |
#define PICFMT "32-bit_rle_???e" /* matches either */ |
| 141 |
#define LPICFMT 15 /* max format id len */ |
| 142 |
|
| 143 |
/* macros for exposures */ |
| 144 |
#define EXPOSSTR "EXPOSURE=" |
| 145 |
#define LEXPOSSTR 9 |
| 146 |
#define isexpos(hl) (!strncmp(hl,EXPOSSTR,LEXPOSSTR)) |
| 147 |
#define exposval(hl) atof((hl)+LEXPOSSTR) |
| 148 |
#define fputexpos(ex,fp) fprintf(fp,"%s%e\n",EXPOSSTR,ex) |
| 149 |
|
| 150 |
/* macros for pixel aspect ratios */ |
| 151 |
#define ASPECTSTR "PIXASPECT=" |
| 152 |
#define LASPECTSTR 10 |
| 153 |
#define isaspect(hl) (!strncmp(hl,ASPECTSTR,LASPECTSTR)) |
| 154 |
#define aspectval(hl) atof((hl)+LASPECTSTR) |
| 155 |
#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa) |
| 156 |
|
| 157 |
/* macros for primary specifications */ |
| 158 |
#define PRIMARYSTR "PRIMARIES=" |
| 159 |
#define LPRIMARYSTR 10 |
| 160 |
#define isprims(hl) (!strncmp(hl,PRIMARYSTR,LPRIMARYSTR)) |
| 161 |
#define primsval(p,hl) sscanf(hl+LPRIMARYSTR, \ |
| 162 |
"%f %f %f %f %f %f %f %f", \ |
| 163 |
&(p)[RED][CIEX],&(p)[RED][CIEY], \ |
| 164 |
&(p)[GRN][CIEX],&(p)[GRN][CIEY], \ |
| 165 |
&(p)[BLU][CIEX],&(p)[BLU][CIEY], \ |
| 166 |
&(p)[WHT][CIEX],&(p)[WHT][CIEY]) |
| 167 |
#define fputprims(p,fp) fprintf(fp, \ |
| 168 |
"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",\ |
| 169 |
PRIMARYSTR, \ |
| 170 |
(p)[RED][CIEX],(p)[RED][CIEY], \ |
| 171 |
(p)[GRN][CIEX],(p)[GRN][CIEY], \ |
| 172 |
(p)[BLU][CIEX],(p)[BLU][CIEY], \ |
| 173 |
(p)[WHT][CIEX],(p)[WHT][CIEY]) |
| 174 |
|
| 175 |
/* macros for color correction */ |
| 176 |
#define COLCORSTR "COLORCORR=" |
| 177 |
#define LCOLCORSTR 10 |
| 178 |
#define iscolcor(hl) (!strncmp(hl,COLCORSTR,LCOLCORSTR)) |
| 179 |
#define colcorval(cc,hl) sscanf(hl+LCOLCORSTR,"%f %f %f", \ |
| 180 |
&(cc)[RED],&(cc)[GRN],&(cc)[BLU]) |
| 181 |
#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \ |
| 182 |
(cc)[RED],(cc)[GRN],(cc)[BLU]) |
| 183 |
|
| 184 |
/* |
| 185 |
* Conversions to and from XYZ space generally don't apply WHTEFFICACY. |
| 186 |
* If you need Y to be luminance (cd/m^2), this must be applied when |
| 187 |
* converting from radiance (watts/sr/m^2). |
| 188 |
*/ |
| 189 |
|
| 190 |
extern RGBPRIMS stdprims; /* standard primary chromaticities */ |
| 191 |
extern COLORMAT rgb2xyzmat; /* RGB to XYZ conversion matrix */ |
| 192 |
extern COLORMAT xyz2rgbmat; /* XYZ to RGB conversion matrix */ |
| 193 |
extern COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */ |
| 194 |
|
| 195 |
#define CGAMUT_LOWER 01 |
| 196 |
#define CGAMUT_UPPER 02 |
| 197 |
#define CGAMUT (CGAMUT_LOWER|CGAMUT_UPPER) |
| 198 |
|
| 199 |
#define rgb_cie(xyz,rgb) colortrans(xyz,rgb2xyzmat,rgb) |
| 200 |
|
| 201 |
#ifdef BSD |
| 202 |
#define cpcolormat(md,ms) bcopy((char *)ms,(char *)md,sizeof(COLORMAT)) |
| 203 |
#else |
| 204 |
#define cpcolormat(md,ms) memcpy((char *)md,(char *)ms,sizeof(COLORMAT)) |
| 205 |
#endif |
| 206 |
|
| 207 |
#ifdef NOPROTO |
| 208 |
/* defined in color.c */ |
| 209 |
extern char *tempbuffer(); |
| 210 |
extern int fwritecolrs(); |
| 211 |
extern int freadcolrs(); |
| 212 |
extern int fwritescan(); |
| 213 |
extern int freadscan(); |
| 214 |
extern void setcolr(); |
| 215 |
extern void colr_color(); |
| 216 |
extern int bigdiff(); |
| 217 |
/* defined in spec_rgb.c */ |
| 218 |
extern void spec_rgb(); |
| 219 |
extern void spec_cie(); |
| 220 |
extern void cie_rgb(); |
| 221 |
extern int clipgamut(); |
| 222 |
extern void colortrans(); |
| 223 |
extern void multcolormat(); |
| 224 |
extern void compxyz2rgbmat(); |
| 225 |
extern void comprgb2xyzmat(); |
| 226 |
extern void comprgb2rgbmat(); |
| 227 |
extern void compxyzWBmat(); |
| 228 |
extern void compxyz2rgbWBmat(); |
| 229 |
extern void comprgb2xyzWBmat(); |
| 230 |
extern void comprgb2rgbWBmat(); |
| 231 |
/* defined in colrops.c */ |
| 232 |
extern int setcolrcor(); |
| 233 |
extern int setcolrinv(); |
| 234 |
extern int setcolrgam(); |
| 235 |
extern int colrs_gambs(); |
| 236 |
extern int gambs_colrs(); |
| 237 |
extern void shiftcolrs(); |
| 238 |
extern void normcolrs(); |
| 239 |
|
| 240 |
#else |
| 241 |
/* defined in color.c */ |
| 242 |
extern char *tempbuffer(unsigned int len); |
| 243 |
extern int fwritecolrs(COLR *scanline, int len, FILE *fp); |
| 244 |
extern int freadcolrs(COLR *scanline, int len, FILE *fp); |
| 245 |
extern int fwritescan(COLOR *scanline, int len, FILE *fp); |
| 246 |
extern int freadscan(COLOR *scanline, int len, FILE *fp); |
| 247 |
extern void setcolr(COLR clr, double r, double g, double b); |
| 248 |
extern void colr_color(COLOR col, COLR clr); |
| 249 |
extern int bigdiff(COLOR c1, COLOR c2, double md); |
| 250 |
/* defined in spec_rgb.c */ |
| 251 |
extern void spec_rgb(COLOR col, int s, int e); |
| 252 |
extern void spec_cie(COLOR col, int s, int e); |
| 253 |
extern void cie_rgb(COLOR rgb, COLOR xyz); |
| 254 |
extern int clipgamut(COLOR col, double brt, int gamut, |
| 255 |
COLOR lower, COLOR upper); |
| 256 |
extern void colortrans(COLOR c2, COLORMAT mat, COLOR c1); |
| 257 |
extern void multcolormat(COLORMAT m3, COLORMAT m2, |
| 258 |
COLORMAT m1); |
| 259 |
extern void compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr); |
| 260 |
extern void comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr); |
| 261 |
extern void comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
| 262 |
extern void compxyzWBmat(COLORMAT mat, float wht1[2], |
| 263 |
float wht2[2]); |
| 264 |
extern void compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr); |
| 265 |
extern void comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr); |
| 266 |
extern void comprgb2rgbWBmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2); |
| 267 |
/* defined in colrops.c */ |
| 268 |
extern int setcolrcor(double (*f)(), double a2); |
| 269 |
extern int setcolrinv(double (*f)(), double a2); |
| 270 |
extern int setcolrgam(double g); |
| 271 |
extern int colrs_gambs(COLR *scan, int len); |
| 272 |
extern int gambs_colrs(COLR *scan, int len); |
| 273 |
extern void shiftcolrs(COLR *scan, int len, int adjust); |
| 274 |
extern void normcolrs(COLR *scan, int len, int adjust); |
| 275 |
|
| 276 |
#endif |
| 277 |
|
| 278 |
#ifdef __cplusplus |
| 279 |
} |
| 280 |
#endif |
