NAME

font − format of font files for Amiga Unix screens

SYNOPSIS

getscr −ffilename ... 
sioc setfont filename
sioc setdeffont filename
sioc getfont

DESCRIPTION

The text facility present in the Amiga Unix console driver uses a font description format described by the following structures from <sys/amiga/screen.h>:

struct charent {
    unsigned char ce_height;/∗ Height of bitmap ∗/
    unsigned char ce_width;/∗ Width of bitmap ∗/
    unsigned char ce_basel;/∗ # pixels above baseline ∗/
    unsigned char ce_move;/∗ Horiz. cursor increment ∗/
    unsigned char ce_bpl;/∗ Bytes per line ∗/
    unsigned char ce_pad;
    unsigned short ce_data;/∗ Offset of bitmap data ∗/
};
 struct font {
    unsigned short f_magic;/∗ Font file magic number ∗/
    unsigned short f_flags;
    unsigned short f_count;/∗ Number of references ∗/
    unsigned short f_pad0;
    unsigned long f_length;/∗ Total # bytes ∗/
    unsigned char f_height, f_width; /∗ "Typical" character size ∗/
    unsigned char f_baseline;/∗ # pixels above baseline ∗/
    unsigned char f_pad1;
    struct charent f_ctable[256]; /∗ Character table ∗/
};
 /∗ font.f_magic ∗/
#define F_MAGIC 0x2a46

In memory, the struct font is followed by a variable number of bytes which contain the actual character bitmap data referenced by the elements of f_ctable[]. The ce_data fields are offsets in bytes relative to the address of the struct font itself. 

A font file is an exact image of the in-memory font information.  The f_length field is available to know how many bytes need to be written to create such a file. 

SEE ALSO

screen(7A), console(7A), sioc(1A), getscr(1A)

FILES

/usr/amiga/lib/font/ - directory where font files are stored

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