From 22a594d46567d3589605d5fee3a31faa8dc10438 Mon Sep 17 00:00:00 2001
From: Paul Lemire <paul.lemire@kdab.com>
Date: Thu, 17 Sep 2020 10:08:34 +0200
Subject: evaluateClipAtLocalTime: prevent negative indices for keyframes
 lookup

Change-Id: I811c1a7334674d670f42eb46195e2e0e23b690f3
Reviewed-by: Mike Krus <mike.krus@kdab.com>
(cherry picked from commit 0731f8b336a6792e344dfefad8b7e9c79afac2d2)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/animation/backend/animationutils.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/animation/backend/animationutils.cpp b/src/animation/backend/animationutils.cpp
index a5656e230..7e21cba3a 100644
--- a/src/animation/backend/animationutils.cpp
+++ b/src/animation/backend/animationutils.cpp
@@ -277,7 +277,7 @@ ClipResults evaluateClipAtLocalTime(AnimationClip *clip, float localTime)
                         return quat;
                     };
 
-                    const int lowerKeyframeBound = channel.channelComponents[0].fcurve.lowerKeyframeBound(localTime);
+                    const int lowerKeyframeBound = std::max(0, channel.channelComponents[0].fcurve.lowerKeyframeBound(localTime));
                     const auto lowerQuat = quaternionFromChannel(lowerKeyframeBound);
                     const auto higherQuat = quaternionFromChannel(lowerKeyframeBound + 1);
                     auto cosHalfTheta = QQuaternion::dotProduct(lowerQuat, higherQuat);
-- 
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