evaluateClipAtLocalTime: prevent negative indices for keyframes lookup

Pick-to: 5.15
Pick-to: 5.12
Change-Id: I811c1a7334674d670f42eb46195e2e0e23b690f3
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/animation/backend/animationutils.cpp b/src/animation/backend/animationutils.cpp
index 2c0c5cb6d..b44b467de 100644
--- a/src/animation/backend/animationutils.cpp
+++ b/src/animation/backend/animationutils.cpp
@@ -270,7 +270,7 @@ 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);