From ea55a33b6026af293830bcb806c0724d04ca7c26 Mon Sep 17 00:00:00 2001
From: Gary Talent <gary@drinkingtea.net>
Date: Sat, 24 Sep 2022 20:38:49 -0500
Subject: [PATCH] [nostalgia/core] Fix possible div by zero in idxToPt

---
 src/nostalgia/core/ptidxconv.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/nostalgia/core/ptidxconv.hpp b/src/nostalgia/core/ptidxconv.hpp
index 6b5ec7f9..9c78b965 100644
--- a/src/nostalgia/core/ptidxconv.hpp
+++ b/src/nostalgia/core/ptidxconv.hpp
@@ -28,6 +28,10 @@ constexpr std::size_t ptToIdx(const geo::Point &pt, int c) noexcept {
 
 [[nodiscard]]
 constexpr geo::Point idxToPt(int i, int c) noexcept {
+	// prevent divide by zeros
+	if (!c) {
+		++c;
+	}
 	const auto t = i / PixelsPerTile; // tile number
 	const auto iti = i % PixelsPerTile; // in tile index
 	const auto tc = t % c; // tile column