FONTX2 is one of the Japanese font driver to implement Japanese
display envilonment to plane IBM PC with VGA system without any
special display card. FONTX2 format is its font file format.

The FONTX2 font file has two or three data fields as follows:

<File header>   [Table 1]
<Code map>      *This field exists in only DBCS font file.
<Font data>     [Table 2]



Table 1: Format of file header (17bytes)
Offset  Size    Description
 00h    6bytes  Signature "FONTX2"
 06h    8bytes  Font name
 0Eh    BYTE    Font width (dot) 4..24
 0Fh    BYTE    Font height (dot) 4..24
 10h    BYTE    Code set (0:Single byte code, 1:Double byte code)



Table 2: Format of font image field
This field contains 256 font faces of each character.
Data size of each font face becomes:

(<font width> + 7) >> 3 * <font height> bytes

So that the field size becomes:

(<font width> + 7) >> 3 * <font height> * 256 bytes



Example of font face mapping of a 16x16 dot font

     1st byte          2nd byte
+----------------------------------+
|b7            b0|b7             b0|
|                |                 |
|                                  |
=                =                 =
|                                  |
|                |                 |
|b7            b0|b7             b0|
+----------------------------------+
                      32th byte



Example of font face mapping of a 24x24 dot font

     1st byte          2nd byte          3rd byte
+----------------------------------------------------+
|b7            b0|b7             b0|b7             b0|
|                |                 |                 |
|                                                    |
=                =                 =                 =
|                                                    |
|                |                 |                 |
|b7            b0|b7             b0|b7             b0|
+----------------------------------------------------+
                                        72th byte