From 61b53ae9378f8cc688ca2617f8cdf081ed14b0ac Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Date: Fri, 16 Feb 2024 09:15:22 +0100
Subject: [PATCH] Improve error message when using wrong pixels_per_point in
 tessellate

Closes https://github.com/emilk/egui/issues/4048
---
 crates/egui/src/context.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crates/egui/src/context.rs b/crates/egui/src/context.rs
index ea51532a..67bcb48f 100644
--- a/crates/egui/src/context.rs
+++ b/crates/egui/src/context.rs
@@ -2115,7 +2115,8 @@ impl Context {
             let texture_atlas = ctx
                 .fonts
                 .get(&pixels_per_point.into())
-                .expect("tessellate called before first call to Context::run()")
+                .expect("tessellate called with a different pixels_per_point than the font atlas was created with. \
+                         You should use egui::FullOutput::pixels_per_point when tessellating.")
                 .texture_atlas();
             let (font_tex_size, prepared_discs) = {
                 let atlas = texture_atlas.lock();