QQuickParticleSystem: Use QVector instead of QList.

This is more efficient, for the use we're seeing. In addition, reserve the size
in advance, to avoid reallocations.

Change-Id: I987ee7cea1aa32c4b1aad1246b6e22b87efd9cc6
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/particles/qquickparticlesystem.cpp b/src/particles/qquickparticlesystem.cpp
index a1367cfe9d..f751b0f447 100644
--- a/src/particles/qquickparticlesystem.cpp
+++ b/src/particles/qquickparticlesystem.cpp
@@ -911,8 +911,10 @@ void QQuickParticleSystem::emittersChanged()
     if (!m_componentComplete)
         return;
 
-    QList<int> previousSizes;
-    QList<int> newSizes;
+    QVector<int> previousSizes;
+    QVector<int> newSizes;
+    previousSizes.reserve(m_nextGroupId);
+    newSizes.reserve(m_nextGroupId);
     for (int i=0; i<m_nextGroupId; i++) {
         previousSizes << groupData[i]->size();
         newSizes << 0;