Replace remaining QLinkedLists with QVector

In both cases, the container holds pointers, so stability of
references can be ruled out as a cause for using linked lists. Both
containers are also only ever appended to and then consumed, so there
are no insertions in the middle that a linked list may speed up. Last,
it also cannot be the sheer size of the container, as QLinkedList has
3x the memory consumption of a vector.

We conclude that none of the things that make QLinkedList a container
of choice apply here, so we can use a QVector instead.

In QSGAbstractSoftwareRenderer, there was an accessor for the linked
list member, but it appears unused, so was removed.

Change-Id: I273f89c0d1267444019088371a5eb0b3b32a763c
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
 
 

2 files changed, 1 insertions, 8 deletions

diff --git a/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer.cpp b/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer.cpp
index 2e5fdbbe6b..d715d900ba 100644
--- a/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer.cpp
+++ b/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer.cpp
@@ -77,11 +77,6 @@ QSGSoftwareRenderableNode *QSGAbstractSoftwareRenderer::renderableNode(QSGNode *
     return m_nodes.value(node, nullptr);
 }
 
-const QLinkedList<QSGSoftwareRenderableNode*> &QSGAbstractSoftwareRenderer::renderableNodes() const
-{
-    return m_renderableNodes;
-}
-
 void QSGAbstractSoftwareRenderer::addNodeMapping(QSGNode *node, QSGSoftwareRenderableNode *renderableNode)
 {
     m_nodes.insert(node, renderableNode);
diff --git a/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h b/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h
index 99204ef25e..6780aac17e 100644
--- a/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h
+++ b/src/quick/scenegraph/adaptations/software/qsgabstractsoftwarerenderer_p.h
@@ -54,7 +54,6 @@
 #include <private/qsgrenderer_p.h>
 
 #include <QtCore/QHash>
-#include <QtCore/QLinkedList>
 
 QT_BEGIN_NAMESPACE
 
@@ -88,7 +87,6 @@ protected:
     QRect backgroundRect();
     // only known after calling optimizeRenderList()
     bool isOpaque() const { return m_isOpaque; }
-    const QLinkedList<QSGSoftwareRenderableNode*> &renderableNodes() const;
 
 private:
     void nodeAdded(QSGNode *node);
@@ -99,7 +97,7 @@ private:
     void nodeOpacityUpdated(QSGNode *node);
 
     QHash<QSGNode*, QSGSoftwareRenderableNode*> m_nodes;
-    QLinkedList<QSGSoftwareRenderableNode*> m_renderableNodes;
+    QVector<QSGSoftwareRenderableNode*> m_renderableNodes;
 
     QSGSimpleRectNode *m_background;