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greg |
1.15 |
/* Copyright (c) 1991 Regents of the University of California */
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greg |
1.1 |
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/* SCCSid "$SunId$ LBL" */
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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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*
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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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#define RED 0
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#define GRN 1
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#define BLU 2
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#define EXP 3
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#define COLXS 128 /* excess used for exponent */
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typedef unsigned char BYTE; /* 8-bit unsigned integer */
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typedef BYTE COLR[4]; /* red, green, blue, exponent */
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#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \
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c1[2]=c2[2],c1[3]=c2[3])
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typedef float COLOR[3]; /* red, green, blue */
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#define colval(col,pri) ((col)[pri])
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#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b))
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#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2])
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#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf))
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#define addcolor(c1,c2) ((c1)[0]+=(c2)[0],(c1)[1]+=(c2)[1],(c1)[2]+=(c2)[2])
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#define multcolor(c1,c2) ((c1)[0]*=(c2)[0],(c1)[1]*=(c2)[1],(c1)[2]*=(c2)[2])
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greg |
1.7 |
#ifdef NTSC
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greg |
2.7 |
#define CIE_x_r 0.670 /* standard NTSC primaries */
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#define CIE_y_r 0.330
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#define CIE_x_g 0.210
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#define CIE_y_g 0.710
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#define CIE_x_b 0.140
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#define CIE_y_b 0.080
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greg |
2.8 |
#define CIE_x_w 0.3333 /* use true white */
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#define CIE_y_w 0.3333
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greg |
1.7 |
#else
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greg |
2.7 |
#define CIE_x_r 0.640 /* nominal CRT primaries */
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#define CIE_y_r 0.330
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#define CIE_x_g 0.290
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#define CIE_y_g 0.600
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#define CIE_x_b 0.150
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#define CIE_y_b 0.060
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greg |
2.8 |
#define CIE_x_w 0.3333 /* use true white */
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#define CIE_y_w 0.3333
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greg |
1.7 |
#endif
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greg |
2.7 |
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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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CIE_x_b*(CIE_y_r - CIE_y_g) )
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#define CIE_C_rD ( (1./CIE_y_w) * \
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( CIE_x_w*(CIE_y_g - CIE_y_b) - \
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CIE_y_w*(CIE_x_g - CIE_x_b) + \
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CIE_x_g*CIE_y_b - CIE_x_b*CIE_y_g ) )
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#define CIE_C_gD ( (1./CIE_y_w) * \
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( CIE_x_w*(CIE_y_b - CIE_y_r) - \
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CIE_y_w*(CIE_x_b - CIE_x_r) - \
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CIE_x_r*CIE_y_b + CIE_x_b*CIE_y_r ) )
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#define CIE_C_bD ( (1./CIE_y_w) * \
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( CIE_x_w*(CIE_y_r - CIE_y_g) - \
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CIE_y_w*(CIE_x_r - CIE_x_g) + \
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CIE_x_r*CIE_y_g - CIE_x_g*CIE_y_r ) )
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#define CIE_rf (CIE_y_r*CIE_C_rD/CIE_D)
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#define CIE_gf (CIE_y_g*CIE_C_gD/CIE_D)
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#define CIE_bf (CIE_y_b*CIE_C_bD/CIE_D)
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#define bright(col) (CIE_rf*(col)[RED]+CIE_gf*(col)[GRN]+CIE_bf*(col)[BLU])
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#define normbright(c) ( ( (long)(CIE_rf*256.+.5)*(c)[RED] + \
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(long)(CIE_gf*256.+.5)*(c)[GRN] + \
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(long)(CIE_bf*256.+.5)*(c)[BLU] ) >> 8 )
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greg |
1.1 |
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greg |
1.14 |
/* luminous efficacies over visible spectrum */
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#define MAXEFFICACY 683. /* defined maximum at 550 nm */
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#define WHTEFFICACY 179. /* uniform white light */
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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 DAYEFFICACY D65EFFICACY /* combined sky and solar */
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#define luminance(col) (WHTEFFICACY * bright(col))
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greg |
1.9 |
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greg |
1.1 |
#define intens(col) ( (col)[0] > (col)[1] \
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? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \
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: (col)[1] > (col)[2] ? (col)[1] : (col)[2] )
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greg |
1.3 |
#define colrval(c,p) ( (c)[EXP] ? \
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ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \
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0. )
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greg |
1.1 |
#define WHTCOLOR {1.0,1.0,1.0}
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#define BLKCOLOR {0.0,0.0,0.0}
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#define WHTCOLR {128,128,128,COLXS+1}
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#define BLKCOLR {0,0,0,0}
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greg |
1.3 |
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greg |
1.11 |
/* picture format identifier */
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#define COLRFMT "32-bit_rle_rgbe"
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greg |
1.6 |
/* macros for exposures */
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greg |
1.5 |
#define EXPOSSTR "EXPOSURE="
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greg |
1.12 |
#define LEXPOSSTR 9
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#define isexpos(hl) (!strncmp(hl,EXPOSSTR,LEXPOSSTR))
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#define exposval(hl) atof((hl)+LEXPOSSTR)
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greg |
1.5 |
#define fputexpos(ex,fp) fprintf(fp,"%s%e\n",EXPOSSTR,ex)
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greg |
1.6 |
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/* macros for pixel aspect ratios */
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#define ASPECTSTR "PIXASPECT="
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greg |
1.12 |
#define LASPECTSTR 10
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#define isaspect(hl) (!strncmp(hl,ASPECTSTR,LASPECTSTR))
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#define aspectval(hl) atof((hl)+LASPECTSTR)
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greg |
1.6 |
#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa)
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greg |
1.5 |
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greg |
1.8 |
/* macros for color correction */
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#define COLCORSTR "COLORCORR="
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greg |
1.12 |
#define LCOLCORSTR 10
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#define iscolcor(hl) (!strncmp(hl,COLCORSTR,LCOLCORSTR))
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#define colcorval(cc,hl) sscanf(hl+LCOLCORSTR,"%f %f %f", \
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greg |
1.8 |
&(cc)[RED],&(cc)[GRN],&(cc)[BLU])
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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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greg |
2.6 |
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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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