GRASS Programmer's Manual  6.4.2(2012)
rgbpack.h
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00001 #ifndef _RGBPACK_H
00002 #define _RGBPACK_H
00003 
00004 #define RED_MASK 0x000000FF
00005 #define GRN_MASK 0x0000FF00
00006 #define BLU_MASK 0x00FF0000
00007 
00008 #define INT_TO_RED(i, r)    (r = (i & RED_MASK))
00009 #define INT_TO_GRN(i, g)    (g = (i & GRN_MASK) >> 8)
00010 #define INT_TO_BLU(i, b)    (b = (i & BLU_MASK) >> 16)
00011 
00012 #define RGB_TO_INT(r,g,b,i) (i = (((r) & RED_MASK) +                \
00013                             ((int)((g) << 8) & GRN_MASK) +     \
00014                             ((int)((b) << 16) & BLU_MASK)))
00015 
00016 #define CONST_COLS 45
00017 #define COLUMNS     9
00018 
00019 #endif /* _RGBPACK_H */
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