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/* Copyright (c) 1991 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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|
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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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|
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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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|
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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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|
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#ifdef NTSC |
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#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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#define CIE_x_w 0.3333 /* use true white */ |
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#define CIE_y_w 0.3333 |
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#else |
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#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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#define CIE_x_w 0.3333 /* use true white */ |
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#define CIE_y_w 0.3333 |
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#endif |
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|
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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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|
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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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/* 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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#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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|
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#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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|
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#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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|
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/* picture format identifier */ |
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#define COLRFMT "32-bit_rle_rgbe" |
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/* macros for exposures */ |
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#define EXPOSSTR "EXPOSURE=" |
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#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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#define fputexpos(ex,fp) fprintf(fp,"%s%e\n",EXPOSSTR,ex) |
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|
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/* macros for pixel aspect ratios */ |
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#define ASPECTSTR "PIXASPECT=" |
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#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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#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa) |
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|
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/* macros for color correction */ |
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#define COLCORSTR "COLORCORR=" |
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#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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&(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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|
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#ifdef DCL_ATOF |
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extern double atof(), ldexp(), frexp(); |
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#endif |
