Glyph Designer Binary Export Format
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As well as outputting the data as a text based file, there is also a binary based file format.
Header
The first three bytes of the header are the file identifier and are always set to 66, 77, 70 (BMF). The fourth byte is the version which is currently 3.
After the header are a number of blocks based on the tags described above.
Block type 1: info
Field Size Type Pos Comment fontsize 2 int 0 bitField 1 bits 2 bit 0:smooth bit 1:unicode bit 2:italic bit 3:bold bit 4:fixedHeight bits 5-7:reservered charSet 1 uint 3 stretchH 2 uint 4 aa 1 uint 6 paddingUp 2 uint 7 paddingRight 1 uint 8 paddingDown 1 uint 9 paddingLeft 1 uint 10 spacingHoriz 1 uint 11 spacingVert 1 uint 12 outline 1 uint 13 fontName n+1 string 14 null terminated string with length n Block type 2: common
Field Size Type Pos Comment lineHeight 2 uint 0 base 2 uint 2 scaleW 2 uint 4 scaleH 2 uint 6 pages 2 uint 8 bitField 1 bits 10 bits 0-6:reserved, bit 7:packed Block type 3: pages
Field Size Type Pos Comment pageNames p*(n+1) strings 0 null terminated strings, each with length n Block type 4: chars
Field Size Type Pos Comment id 4 uint 0+c*20 these fields are repeated until all characters have been described x 2 uint 4+c*20 y 2 uint 6+c*20 width 2 uint 8+c*20 height 2 uint 10+c*20 xoffset 2 uint 12+c*20 yoffset 2 uint 14+c*20 xadvance 2 uint 16+c*20 page 1 uint 18+c*20 chnl 1 uint 19+c*20 The number of characters in the file can be calculated by taking the size of the block and dividing it with the size of the charInfo structure, i.e. numChars = charsBlock.blockSize/20
