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/// The implementation of an actual font implementation
///
/// This exists since for the image rendering task, we want to use
/// the system font. But in wasm application, we want the browser
/// to handle all the font issue.
///
/// Thus we need different mechanism for the font implementation
#[cfg(all(
not(all(target_arch = "wasm32", not(target_os = "wasi"))),
feature = "ttf"
))]
mod ttf;
#[cfg(all(
not(all(target_arch = "wasm32", not(target_os = "wasi"))),
feature = "ttf"
))]
use ttf::FontDataInternal;
#[cfg(all(
not(all(target_arch = "wasm32", not(target_os = "wasi"))),
not(feature = "ttf")
))]
mod naive;
#[cfg(all(
not(all(target_arch = "wasm32", not(target_os = "wasi"))),
not(feature = "ttf")
))]
use naive::FontDataInternal;
#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
mod web;
#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))]
use web::FontDataInternal;
mod font_desc;
pub use font_desc::*;
/// Represents a box where a text label can be fit
pub type LayoutBox = ((i32, i32), (i32, i32));
pub trait FontData: Clone {
type ErrorType: Sized + std::error::Error + Clone;
fn new(family: FontFamily, style: FontStyle) -> Result<Self, Self::ErrorType>;
fn estimate_layout(&self, size: f64, text: &str) -> Result<LayoutBox, Self::ErrorType>;
fn draw<E, DrawFunc: FnMut(i32, i32, f32) -> Result<(), E>>(
&self,
_pos: (i32, i32),
_size: f64,
_text: &str,
_draw: DrawFunc,
) -> Result<Result<(), E>, Self::ErrorType> {
panic!("The font implementation is unable to draw text");
}
}
|
