| 1 |
greg |
1.15 |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
greg |
1.1 |
|
| 3 |
|
|
/* SCCSid "$SunId$ LBL" */ |
| 4 |
|
|
|
| 5 |
|
|
/* |
| 6 |
|
|
* color.h - header for routines using pixel color values. |
| 7 |
|
|
* |
| 8 |
|
|
* 12/31/85 |
| 9 |
|
|
* |
| 10 |
|
|
* Two color representations are used, one for calculation and |
| 11 |
|
|
* another for storage. Calculation is done with three floats |
| 12 |
|
|
* for speed. Stored color values use 4 bytes which contain |
| 13 |
|
|
* three single byte mantissas and a common exponent. |
| 14 |
|
|
*/ |
| 15 |
|
|
|
| 16 |
|
|
#define RED 0 |
| 17 |
|
|
#define GRN 1 |
| 18 |
|
|
#define BLU 2 |
| 19 |
|
|
#define EXP 3 |
| 20 |
|
|
#define COLXS 128 /* excess used for exponent */ |
| 21 |
|
|
|
| 22 |
|
|
typedef unsigned char BYTE; /* 8-bit unsigned integer */ |
| 23 |
|
|
|
| 24 |
|
|
typedef BYTE COLR[4]; /* red, green, blue, exponent */ |
| 25 |
|
|
|
| 26 |
|
|
#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \ |
| 27 |
|
|
c1[2]=c2[2],c1[3]=c2[3]) |
| 28 |
|
|
|
| 29 |
|
|
typedef float COLOR[3]; /* red, green, blue */ |
| 30 |
|
|
|
| 31 |
|
|
#define colval(col,pri) ((col)[pri]) |
| 32 |
|
|
|
| 33 |
|
|
#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b)) |
| 34 |
|
|
|
| 35 |
|
|
#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2]) |
| 36 |
|
|
|
| 37 |
|
|
#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf)) |
| 38 |
|
|
|
| 39 |
|
|
#define addcolor(c1,c2) ((c1)[0]+=(c2)[0],(c1)[1]+=(c2)[1],(c1)[2]+=(c2)[2]) |
| 40 |
|
|
|
| 41 |
|
|
#define multcolor(c1,c2) ((c1)[0]*=(c2)[0],(c1)[1]*=(c2)[1],(c1)[2]*=(c2)[2]) |
| 42 |
|
|
|
| 43 |
greg |
1.7 |
#ifdef NTSC |
| 44 |
|
|
#define bright(col) (.295*(col)[RED]+.636*(col)[GRN]+.070*(col)[BLU]) |
| 45 |
greg |
2.3 |
#define normbright(c) (int)((74L*(c)[RED]+164L*(c)[GRN]+18L*(c)[BLU])>>8) |
| 46 |
greg |
1.7 |
#else |
| 47 |
|
|
#define bright(col) (.263*(col)[RED]+.655*(col)[GRN]+.082*(col)[BLU]) |
| 48 |
greg |
2.3 |
#define normbright(c) (int)((67L*(c)[RED]+168L*(c)[GRN]+21L*(c)[BLU])>>8) |
| 49 |
greg |
1.7 |
#endif |
| 50 |
greg |
1.1 |
|
| 51 |
greg |
1.14 |
/* luminous efficacies over visible spectrum */ |
| 52 |
|
|
#define MAXEFFICACY 683. /* defined maximum at 550 nm */ |
| 53 |
|
|
#define WHTEFFICACY 179. /* uniform white light */ |
| 54 |
|
|
#define D65EFFICACY 203. /* standard illuminant D65 */ |
| 55 |
|
|
#define INCEFFICACY 160. /* illuminant A (incand.) */ |
| 56 |
|
|
#define SUNEFFICACY 208. /* illuminant B (solar dir.) */ |
| 57 |
|
|
#define SKYEFFICACY D65EFFICACY /* skylight */ |
| 58 |
|
|
#define DAYEFFICACY D65EFFICACY /* combined sky and solar */ |
| 59 |
|
|
|
| 60 |
|
|
#define luminance(col) (WHTEFFICACY * bright(col)) |
| 61 |
greg |
1.9 |
|
| 62 |
greg |
1.1 |
#define intens(col) ( (col)[0] > (col)[1] \ |
| 63 |
|
|
? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \ |
| 64 |
|
|
: (col)[1] > (col)[2] ? (col)[1] : (col)[2] ) |
| 65 |
|
|
|
| 66 |
greg |
1.3 |
#define colrval(c,p) ( (c)[EXP] ? \ |
| 67 |
|
|
ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \ |
| 68 |
|
|
0. ) |
| 69 |
|
|
|
| 70 |
greg |
1.1 |
#define WHTCOLOR {1.0,1.0,1.0} |
| 71 |
|
|
#define BLKCOLOR {0.0,0.0,0.0} |
| 72 |
|
|
#define WHTCOLR {128,128,128,COLXS+1} |
| 73 |
|
|
#define BLKCOLR {0,0,0,0} |
| 74 |
greg |
1.3 |
|
| 75 |
greg |
1.11 |
/* picture format identifier */ |
| 76 |
|
|
#define COLRFMT "32-bit_rle_rgbe" |
| 77 |
|
|
|
| 78 |
greg |
1.6 |
/* macros for exposures */ |
| 79 |
greg |
1.5 |
#define EXPOSSTR "EXPOSURE=" |
| 80 |
greg |
1.12 |
#define LEXPOSSTR 9 |
| 81 |
|
|
#define isexpos(hl) (!strncmp(hl,EXPOSSTR,LEXPOSSTR)) |
| 82 |
|
|
#define exposval(hl) atof((hl)+LEXPOSSTR) |
| 83 |
greg |
1.5 |
#define fputexpos(ex,fp) fprintf(fp,"%s%e\n",EXPOSSTR,ex) |
| 84 |
greg |
1.6 |
|
| 85 |
|
|
/* macros for pixel aspect ratios */ |
| 86 |
|
|
#define ASPECTSTR "PIXASPECT=" |
| 87 |
greg |
1.12 |
#define LASPECTSTR 10 |
| 88 |
|
|
#define isaspect(hl) (!strncmp(hl,ASPECTSTR,LASPECTSTR)) |
| 89 |
|
|
#define aspectval(hl) atof((hl)+LASPECTSTR) |
| 90 |
greg |
1.6 |
#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa) |
| 91 |
greg |
1.5 |
|
| 92 |
greg |
1.8 |
/* macros for color correction */ |
| 93 |
|
|
#define COLCORSTR "COLORCORR=" |
| 94 |
greg |
1.12 |
#define LCOLCORSTR 10 |
| 95 |
|
|
#define iscolcor(hl) (!strncmp(hl,COLCORSTR,LCOLCORSTR)) |
| 96 |
|
|
#define colcorval(cc,hl) sscanf(hl+LCOLCORSTR,"%f %f %f", \ |
| 97 |
greg |
1.8 |
&(cc)[RED],&(cc)[GRN],&(cc)[BLU]) |
| 98 |
|
|
#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \ |
| 99 |
|
|
(cc)[RED],(cc)[GRN],(cc)[BLU]) |
| 100 |
|
|
|
| 101 |
greg |
2.2 |
extern double ldexp(); |
| 102 |
|
|
#ifndef atof /* atof's a macro on some systems! */ |
| 103 |
|
|
extern double atof(); |
| 104 |
|
|
#endif |
