From 3d05dea965dac69f9ee040a8ac0930b89a883593 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 29 Sep 2025 18:35:49 +0200
Subject: [PATCH] Stopgap solution for pianoroll zoom FPE

It should be impossible to zoom to < 1 sample/pixel,
but apparently some users manage this using elaborate scroll+zoom
tricks to be tracked down.
---
 gtk2_ardour/pianoroll.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gtk2_ardour/pianoroll.cc b/gtk2_ardour/pianoroll.cc
index 0ac2161f18..008f7e4881 100644
--- a/gtk2_ardour/pianoroll.cc
+++ b/gtk2_ardour/pianoroll.cc
@@ -698,6 +698,13 @@ Pianoroll::set_samples_per_pixel (samplecnt_t spp)
 {
 	EC_LOCAL_TEMPO_SCOPE;
 
+	assert (spp > 0);
+#ifndef NDEBUG
+	if (spp < 1) {
+		spp = 1;
+	}
+#endif
+
 	CueEditor::set_samples_per_pixel (spp);
 
 	if (view) {