FreeType has font metrics for the underline position, but I can't seem to find any metrics for the strikethrough position. How do text engines usually compute this value? Should I just put it at 1/3*ascent or whatever looks good? I suppose that for Latin at least this should be 1/2*height of "m" but I'm looking for a more general solution.
How to get the height at which to draw a strikethrough from FreeType
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This information is not provided for all the various font formats supported by Freetype; so it is not exposed on the "main" interface.
In the (common but not universal) case of TrueType or OpenType fonts it can be retrieved in the TT_OS2 table, fields
yStrikeoutSizeandyStrikeoutPosition; you should be prepared for the table to be lacking, oryStrikeoutSizeto be null or negative thus unusable.I do not remember of an equivalent for plain Postscript fonts (
.pfb/.pfa, even in.afm.) The various bitmap formats might have the information available; an example isstrike_outin Windows FNT; notice this is the position, while the size defaults to be the same as underlining. Basically every format is alone here.