forked from len0rd/rockbox
93b231c693
propfont and loadable font code. New font file format. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2269 a1c6a512-1295-4272-9138-f99709370657
35 lines
No EOL
1.5 KiB
Text
35 lines
No EOL
1.5 KiB
Text
Description of the binary AJF font file format (version 2)
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Index Descripton
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00 MAGIC1 (0xBD)
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01 MAGIC2 (0xFC) used to make sure this is an ajf font
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02 Unused, planned use: "code page"
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03 - 22 ASCII text holding the font name
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23 - 24 "bound width" (high 8 bits, low 8 bits)
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25 - 26 "bound height" (high 8 bits, low 8 bits)
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26 - 28 first character in the font
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29 - 2a number of characters in the font (alwasys 0x00ff now)
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2b - map offset table starts here. Each offset entry is two bytes:
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offset highbyte, offset lowbyte
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The offset is number of bytes from the start of this file, to where
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in the font data this particular char's font data starts.
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There is one offset entry for each character in this font, starting
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with 'first character' (set above) and ending when all the 'number
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of characters' have been stored.
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?? - Font data. First four bytes width, height, dispx and dispy and then
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the glyph in Rockbox-internal image-format. That means column-wise
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left-to-right for the full width, the first 8 pixels of height. Then
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follows the next 8 pixels of height left-to-right.
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We don't currently support fonts larger than 16 pixels. (This font
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file format would have no problem with bigger sizes, but the internal
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bitmap function has.)
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References
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The BDF file format
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http://partners.adobe.com/asn/developer/pdfs/tn/5005.BDF_Spec.pdf |