Crash with display scaling not set to 100% in tessellate about egui HOT 6 CLOSED

How are you using egui and epaint? Via eframe? What is your reproduce for this?

What the error message is trying to say is that the pixels_per_point passed to tessellate must match the pixels_per_point of the Fonts used during the frame.

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At the very least that error message should be fixed. It's extremely unhelpful.

We do not use eframe, it's a custom integration on top of a Vulkan renderer using winit. The only workaround I found is to do this:

        let mut raw_input = self.egui_winit.take_egui_input(window);
        raw_input.viewports.iter_mut().for_each(|viewport| {
            // Hack around bug with scale factor causing egui to crash in fonts lookup
            viewport.1.native_pixels_per_point = Some(1.0);
        });
        let egui::FullOutput { platform_output, textures_delta, shapes, pixels_per_point: _, viewport_output: _ } =
            self.egui_winit.egui_ctx().run(raw_input, run_ui);

That doesn't seem very nice.

from egui.

You should be using pixels_per_point returned in FullOutput: https://docs.rs/egui/latest/egui/struct.FullOutput.html#structfield.pixels_per_point

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@emilk That would give me >1x scaling which is not what I want.

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If you don't want egui scaling, then call ctx.set_zoom_factor(1.0); and turn off the zoom_with_keyboard option.

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Doesn't work. egui_winit forces the scale from the OS.

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