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greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */
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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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#define bright(col) (.30*(col)[RED]+.59*(col)[GRN]+.11*(col)[BLU])
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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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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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#define norm_bright(c) (int)((77L*(c)[RED]+151L*(c)[GRN]+28L*(c)[BLU])/256)
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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 |
1.2 |
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greg |
1.3 |
/* definitions for resolution header */
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greg |
1.2 |
#define XDECR 1
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#define YDECR 2
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#define YMAJOR 4
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greg |
1.3 |
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extern double ldexp();
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