From 98c12219089d9c171aa3d5269733cafb54467073 Mon Sep 17 00:00:00 2001
From: heckflosse <heckflosse67@gmx.de>
Date: Tue, 1 Sep 2015 18:09:46 +0200
Subject: [PATCH] crash when first two curve points are at x=0, fixes #2888

---
 rtengine/diagonalcurves.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rtengine/diagonalcurves.cc b/rtengine/diagonalcurves.cc
index 5ef4eefca..f46cdb8cb 100644
--- a/rtengine/diagonalcurves.cc
+++ b/rtengine/diagonalcurves.cc
@@ -70,6 +70,10 @@ DiagonalCurve::DiagonalCurve (const std::vector<double>& p, int poly_pn)
                 identity = false;
             }
 
+            if(x[0] == 0.f && x[1] == 0.f)
+                // Avoid crash when first two points are at x = 0 (git Issue 2888)
+                x[1] = 0.5f;
+
             if (!identity) {
                 if (kind == DCT_Spline && N > 2) {
                     spline_cubic_set ();