How do I calculate the space in between two glyphs in a TTF font? -

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this graph definition of few terms horizontal glyph metrics fonts.

glyph metrics

let's have sentence,

foo bar baz.

how spacing size, in pixels, between words "foo" , "bar"? suppose sum,

  • the whitespace right-padding in grapheme 'o' in "foo": subtract advance bearingx + width
  • the advance of space character.
  • the whitespace left-padding of letter 'b' in "bar": bearingx.

is correct? table has bearingx?

how spacing size, in pixels, between words "foo" , "bar"?

you need know horizontal advance of space character , kerning between "o" , " ", , between " " , b". don't think need bearingx spacing. result in font "units", defined unitsperem of head tag. convert result * font size / unitsperem, , spacing in "points". need known, how many pixels there in 1 point: depends on application, monitor dpi or postscript's 72 dpi.

what table has bearingx?

bearingx in in hmtx, under "lsb" (left-side bearing) of longhormetric (and leftsidebearing, obviously).


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