iced-rs/iced · error

Read font system

Error message

Read font system

What it means

Error "Read font system" thrown in iced-rs/iced.

Source

Thrown at graphics/src/text/paragraph.rs:228

        let mut font_system = text::font_system().write().expect("Write font system");

        paragraph.buffer.set_size(
            Some(new_bounds.width * paragraph.hint_factor),
            Some(new_bounds.height * paragraph.hint_factor),
        );
        paragraph
            .buffer
            .shape_until_scroll(font_system.raw(), false);

        let min_bounds = text::align(&mut paragraph.buffer, font_system.raw(), paragraph.align_x)
            / paragraph.hint_factor;

        paragraph.bounds = new_bounds;
        paragraph.min_bounds = min_bounds;
    }

    fn compare(&self, text: Text<()>) -> core::text::Difference {
        let font_system = text::font_system().read().expect("Read font system");
        let paragraph = self.internal();
        let metrics = paragraph.buffer.metrics();

        if paragraph.version != font_system.version
            || metrics.font_size != text.size.0 * paragraph.hint_factor
            || metrics.line_height
                != text.line_height.to_absolute(text.size).0 * paragraph.hint_factor
            || paragraph.font != text.font
            || paragraph.shaping != text.shaping
            || paragraph.wrapping != text.wrapping
            || paragraph.ellipsis != text.ellipsis
            || paragraph.align_x != text.align_x
            || paragraph.align_y != text.align_y
            || paragraph.hint.then_some(paragraph.hint_factor)
                != text::hint_factor(text.size, text.hint_factor)
        {
            core::text::Difference::Shape
        } else if paragraph.bounds != text.bounds {

View on GitHub (pinned to 2cffa99b39)

When it happens

Trigger: Thrown at graphics/src/text/paragraph.rs:228 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of iced-rs/iced@2cffa99b39 (2026-08-16). Data as JSON: /api/errors/9e74aab4355d5ebc. Report an issue: GitHub.