imgui-rs/imgui-examples/examples/multiple_fonts.rs

use imgui::*;

mod support;

fn main() {
    let mut system = support::init(file!());
    let dokdo = system.imgui.fonts().add_font(&[FontSource::TtfData {
        data: include_bytes!("../../resources/Dokdo-Regular.ttf"),
        size_pixels: system.font_size,
        config: None,
    }]);
    let roboto = system.imgui.fonts().add_font(&[FontSource::TtfData {
        data: include_bytes!("../../resources/Roboto-Regular.ttf"),
        size_pixels: system.font_size,
        config: None,
    }]);
    system
        .renderer
        .reload_font_texture(&mut system.imgui)
        .expect("Failed to reload fonts");
    system.main_loop(|run, ui| {
        Window::new(im_str!("Hello world"))
            .opened(run)
            .build(ui, || {
                ui.text("Hello, I'm the default font!");
                let _roboto = ui.push_font(roboto);
                ui.text("Hello, I'm Roboto Regular!");
                let _dokdo = ui.push_font(dokdo);
                ui.text("Hello, I'm Dokdo Regular!");
                drop(_dokdo);
                ui.text("Hello, I'm Roboto Regular again!");
                drop(_roboto);
                ui.text("Hello, I'm the default font again!");
            });
    });
}