example of `ggez::graphics::Font::new` leaking memory

02_hello_world.rs

//! Basic hello world example.

extern crate cgmath;
extern crate ggez;

use ggez::event;
use ggez::graphics;
use ggez::{Context, GameResult};
use std::env;
use std::path;
use ggez::graphics::DrawParam;

struct MainState {
    font: graphics::Font
}

impl MainState {
    fn new(ctx: &mut Context) -> GameResult<MainState> {
        let font = graphics::Font::new(ctx, "/DejaVuSerif.ttf")?;
        let s = MainState { font };
        Ok(s)
    }
}

impl event::EventHandler for MainState {
    fn update(&mut self, _ctx: &mut Context) -> GameResult {
        Ok(())
    }

    fn draw(&mut self, ctx: &mut Context) -> GameResult {
        graphics::clear(ctx, [0.1, 0.2, 0.3, 1.0].into());

        let text = graphics::Text::new(
            (
                "Sample text",
                // If the line belong will be replaced with `self.font,` the memory leaks will be gone
                graphics::Font::new(ctx, "/DejaVuSerif.ttf")?,
                48.0
            )
        );
        graphics::draw(ctx, &text, DrawParam::default().dest(cgmath::Point2::new(10.0, 10.0)))?;
        graphics::present(ctx)?;

        Ok(())
    }
}

pub fn main() -> GameResult {
    let resource_dir = if let Ok(manifest_dir) = env::var("CARGO_MANIFEST_DIR") {
        let mut path = path::PathBuf::from(manifest_dir);
        path.push("resources");
        path
    } else {
        path::PathBuf::from("./resources")
    };

    let cb = ggez::ContextBuilder::new("helloworld", "ggez").add_resource_path(resource_dir);
    let (ctx, event_loop) = &mut cb.build()?;

    let state = &mut MainState::new(ctx)?;
    event::run(ctx, event_loop, state)
}