Byte Map Font

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A Byte Map Font, or BMF, contains an arbitrary amount of paletted characters.

It is of this form:

Offset Length Name Content
0x0000 4*1 Identifier 0xE1E6D51A
0x0004 1 Version Normally 0x11
0x0005 1 Line height Unsigned value
0x0006 1 Size over the base line Signed value
0x0007 1 Size under the base line Signed value
0x0008 1 Space after each character, in addition to each character's own shift Signed value
0x0009 1 Inner size (?) Signed value
0x000A 1 Count of used colors (not the same as palette size) Unsigned value
0x000B 1 Highest used color index Unsigned value
0x000C 4 Reserved values Should be 0x00000000
0x0010 1 Number of RGB entries in the palette Unsigned value
0x0011 x*3 Palette A series of 6-bit RGB values, starting from palette index 1 (index 0 is transparent and not described).

After the palette comes an information string about the font:

Offset Length Name Content
0x0000 1 Size Unsigned value
0x0001 x Info ASCII characters

After the string comes a two-byte, little-endian unsigned value for the amount of characters. Then comes the character data:

Offset Length Name Content
0x0000 1 Which character ASCII character
0x0001 1 Width Unsigned value, size of the character image
0x0002 1 Height Unsigned value, size of the character image
0x0003 1 X-offset Signed value, offset of the character image relative to the cursor
0x0004 1 Y-offset Signed value, offset of the character image relative to the cursor
0x0005 1 Shift Horizontal cursor shift after drawing the character (used instead of width) in addition to the global font value of space added after each character
0x0001 x Info Character image as raw pixels in row-major format

Characters are listed one after the other until the end of the file. Note that some characters may have a null image (0 width and/or 0 height); spaces are likely to have no image and instead be defined only by the shift value.

External link

  • BMF Homepage - contains a couple of utilities and a large collection of fonts