util.h - ff2txt - farbfeld image to plain text visualization
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       util.h (290B)
       ---
            1 #define MAX_WIDTH        (1 << 12)
            2 #define BRAILLE_START        10240
            3 #define COLORS                4
            4 
            5 #define LEN(X)                (sizeof(X) / sizeof(*X))
            6 
            7 struct col {
            8         uint16_t        red;
            9         uint16_t        green;
           10         uint16_t        blue;
           11         uint16_t        alpha;
           12 };
           13 
           14 void        err(char *);
           15 void        read_header(uint32_t *, uint32_t *);
           16 int        col_is_bright(struct col);