245 lines
8.5 KiB
C
245 lines
8.5 KiB
C
/* RCSid $Id: color.h,v 2.29 2006/09/05 21:54:32 greg Exp $ */
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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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* 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 CIEX 0 /* or, if input is XYZ... */
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#define CIEY 1
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#define CIEZ 2
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#define EXP 3 /* exponent same for either format */
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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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#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 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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typedef float COLORMAT[3][3]; /* color coordinate conversion matrix */
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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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#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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#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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#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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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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/* As of 9-94, CIE_rf=.265074126, CIE_gf=.670114631 and CIE_bf=.064811243 */
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/***** The following definitions are valid for RGB colors only... *****/
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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 (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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/***** ...end of stuff specific to RGB colors *****/
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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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#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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#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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/* picture format identifier */
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#define COLRFMT "32-bit_rle_rgbe"
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#define CIEFMT "32-bit_rle_xyze"
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#define PICFMT "32-bit_rle_???e" /* matches either */
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#define LPICFMT 15 /* max format id len */
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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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/* 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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/* macros for primary specifications */
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#define PRIMARYSTR "PRIMARIES="
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#define LPRIMARYSTR 10
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#define isprims(hl) (!strncmp(hl,PRIMARYSTR,LPRIMARYSTR))
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#define primsval(p,hl) sscanf(hl+LPRIMARYSTR, \
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"%f %f %f %f %f %f %f %f", \
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&(p)[RED][CIEX],&(p)[RED][CIEY], \
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&(p)[GRN][CIEX],&(p)[GRN][CIEY], \
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&(p)[BLU][CIEX],&(p)[BLU][CIEY], \
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&(p)[WHT][CIEX],&(p)[WHT][CIEY])
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#define fputprims(p,fp) fprintf(fp, \
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"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",\
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PRIMARYSTR, \
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(p)[RED][CIEX],(p)[RED][CIEY], \
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(p)[GRN][CIEX],(p)[GRN][CIEY], \
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(p)[BLU][CIEX],(p)[BLU][CIEY], \
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(p)[WHT][CIEX],(p)[WHT][CIEY])
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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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* 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 COLOR cblack, cwhite; /* black (0,0,0) and white (1,1,1) */
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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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#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 int colorprimsOK(RGBPRIMS pr);
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extern int compxyz2rgbmat(COLORMAT mat, RGBPRIMS pr);
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extern int comprgb2xyzmat(COLORMAT mat, RGBPRIMS pr);
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extern int comprgb2rgbmat(COLORMAT mat, RGBPRIMS pr1, RGBPRIMS pr2);
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extern int compxyzWBmat(COLORMAT mat, float wht1[2],
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float wht2[2]);
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extern int compxyz2rgbWBmat(COLORMAT mat, RGBPRIMS pr);
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extern int comprgb2xyzWBmat(COLORMAT mat, RGBPRIMS pr);
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extern int 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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