pub fn evaluate_width<'a>(
context: &'a impl CharstringContext,
blend_state: Option<BlendState<'a>>,
charstring_data: &[u8],
) -> Result<Option<Fixed>, Error>Expand description
Returns the advance width the charstring states, without drawing it.
A charstring states its width before it draws anything: Type 1 in the
hsbw or sbw that must open it, Type 2 as an optional extra argument
on the first operator that clears the stack. Evaluation therefore stops
as soon as that operator has been seen, which for most glyphs is a
handful of bytes out of hundreds.
None where the charstring states no width of its own. For Type 2 that
is the common case and means the font’s default width applies; the
caller supplies it, since the charstring does not know it.