From c4ee3ba64e9b9da71d3b224446795d3bb81d65a0 Mon Sep 17 00:00:00 2001
From: notgull <jtnunley01@gmail.com>
Date: Sat, 18 Feb 2023 17:59:30 -0800
Subject: [PATCH 1/2] Early panic on divide by zero

---
 src/buffer.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/buffer.rs b/src/buffer.rs
index 9b243d3..ad3bde1 100644
--- a/src/buffer.rs
+++ b/src/buffer.rs
@@ -306,6 +306,8 @@ pub struct Buffer<'a> {
 impl<'a> Buffer<'a> {
     /// Create a new [`Buffer`] with the provided [`FontSystem`] and [`Metrics`]
     pub fn new(font_system: &'a FontSystem, metrics: Metrics) -> Self {
+        assert_ne!(metrics.line_height, 0, "line height cannot be 0");
+
         let mut buffer = Self {
             font_system,
             lines: Vec::new(),

From 86d7ba959ed77212807048f844b502954d5acc38 Mon Sep 17 00:00:00 2001
From: notgull <jtnunley01@gmail.com>
Date: Sat, 18 Feb 2023 18:00:57 -0800
Subject: [PATCH 2/2] Forgot about set_metrics

---
 src/buffer.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/buffer.rs b/src/buffer.rs
index ad3bde1..7bd6554 100644
--- a/src/buffer.rs
+++ b/src/buffer.rs
@@ -493,6 +493,7 @@ impl<'a> Buffer<'a> {
     /// Set the current [`Metrics`]
     pub fn set_metrics(&mut self, metrics: Metrics) {
         if metrics != self.metrics {
+            assert_ne!(metrics.font_size, 0, "font size cannot be 0");
             self.metrics = metrics;
             self.relayout();
             self.shape_until_scroll();