From 7a918fa373af0392f6dde1eee79f2377f0c9f4cf Mon Sep 17 00:00:00 2001
From: Alberto Griggio <agriggio@users.noreply.github.com>
Date: Mon, 10 Dec 2018 17:26:22 +0100
Subject: [PATCH] Fixed bug in evaluating catmull-rom curves with straight
 segments at 0 or 1

Fixes #5072
---
 rtengine/diagonalcurves.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rtengine/diagonalcurves.cc b/rtengine/diagonalcurves.cc
index c81d48f16..b4c88fd68 100644
--- a/rtengine/diagonalcurves.cc
+++ b/rtengine/diagonalcurves.cc
@@ -326,6 +326,9 @@ inline void catmull_rom_spline(int n_points,
     if (p1_y == p2_y && (p1_y == 0 || p1_y == 1)) {
         for (i = 1; i < n_points-1; ++i) {
             t = p1_x + space * i;
+            if (t >= p2_x) {
+                break;
+            }
             res_x.push_back(t);
             res_y.push_back(p1_y);
         }