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use super::{FontData, FontFamily, FontStyle, LayoutBox};
#[derive(Debug, Clone)]
pub struct FontError;
impl std::fmt::Display for FontError {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
write!(fmt, "General Error")?;
Ok(())
}
}
impl std::error::Error for FontError {}
#[derive(Clone)]
pub struct FontDataInternal(String, String);
impl FontData for FontDataInternal {
type ErrorType = FontError;
fn new(family: FontFamily, style: FontStyle) -> Result<Self, FontError> {
Ok(FontDataInternal(
family.as_str().into(),
style.as_str().into(),
))
}
/// Note: This is only a crude estimatation, since for some backend such as SVG, we have no way to
/// know the real size of the text anyway. Thus using font-kit is an overkill and doesn't helps
/// the layout.
fn estimate_layout(&self, size: f64, text: &str) -> Result<LayoutBox, Self::ErrorType> {
let em = size / 1.24 / 1.24;
Ok((
(0, -em.round() as i32),
(
(em * 0.7 * text.len() as f64).round() as i32,
(em * 0.24).round() as i32,
),
))
}
}
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