From b0438d27a40789e9806bba00e6ab6214e5b9485d Mon Sep 17 00:00:00 2001
From: brentfpage <brentfpage@gmail.com>
Date: Sun, 11 Oct 2026 10:33:14 -0700
Subject: [PATCH] add guard against div-by-0 when processing SDL pinch events

---
 imgui.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/imgui.cpp b/imgui.cpp
index c152e821d..2e6a12b19 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -2086,6 +2086,8 @@ void ImGuiIO::AddPinchUpdateEvent(float scale, float span_x, float span_y, float
     e.Source = ImGuiInputSource_Mouse;
     e.EventId = g.InputEventsNextEventId++;
     float norm = ImSqrt(ImPow(span_x,2) + ImPow(span_y,2));
+    if(norm == 0)
+        return;
     e.MouseWheel.WheelX = (1-scale)*100*span_x/norm;
     e.MouseWheel.WheelY = (1-scale)*100*span_y/norm;
     e.MouseWheel.MouseSource = g.InputEventsNextMouseSource;