forked from 0ad/0ad
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
Fonts consist of
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fontname.fnt
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fontname.png
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and you load fonts by just specifying the "path/fontname" part.
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The .png is an 8-bit greyscale image, used for alpha-blending the text.
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(DXTC allows 0.5 bytes/pixel at best, which isn't much better than
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PNG's 1 byte/pixel, and DXTC's lossiness is almost noticeable,
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so we stick with lossless formats.)
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Or it's a 32-bit RGBA image, to allow more complex text styles.
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The .fnt file is something like:
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101
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512 256
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a
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3
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16
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12
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32 0 0 10 10 12
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33 10 0 6 10 7
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3300 16 0 6 10 7
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First line = version number of file, for slightly better error
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detection if people leave old ones hanging around.
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Second line = size of texture (width/height).
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Third line = texture format: "a" or "rgba".
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Fourth line = number of glyphs in the font.
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Fifth line = line spacing (pixels between each baseline)
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Sixth line = text 'height' (height of the "I" glyph, possibly manually
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adjusted so that vertical centering works)
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Each subsequent line is
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<code point> <x> <y> <width> <height> <x offset> <y offset> <advance>
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0 <= Code point < 2^16.
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x, y, width, height are in pixels on the texture.
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x/y offset are the position of the texture relative to the glyph's origin.
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advance is the number of pixels to move along for the next character.
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