Fix sprites leaking textures in SW and OpenVG backends

When a QSGSpriteNode is initialized with a texture, it is supposed to
take ownership of the texture and delete it when the node gets
deleted. In the default backend, this happens automatically: The
texture gets assigned to the node's QSGMaterial object, and the node
has set the OwnsMaterial flag, and so the inherited QSGGeometry
destructor takes care of deleting the material, which deletes the
texture.

However, the Software and OpenVG backends do not have material
objects, so the above mechanism does not apply, and so the texture
objects are leaked. Fix by deleting the texture object directly from
the SoftwareSpriteNode and OpenVGSpriteNode destructors.

Fixes: QTBUG-77019
Change-Id: I503d704f66593ba6a36c969db80f74f715382b6b
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

2 files changed, 7 insertions, 1 deletions

diff --git a/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode.cpp b/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode.cpp
index d4e5e98d68..17e8bdc2f9 100644
--- a/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode.cpp
+++ b/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode.cpp
@@ -49,6 +49,11 @@ QSGSoftwareSpriteNode::QSGSoftwareSpriteNode()
     setGeometry((QSGGeometry*)1);
 }
 
+QSGSoftwareSpriteNode::~QSGSoftwareSpriteNode()
+{
+    delete m_texture;
+}
+
 void QSGSoftwareSpriteNode::setTexture(QSGTexture *texture)
 {
     m_texture = qobject_cast<QSGSoftwarePixmapTexture*>(texture);
diff --git a/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode_p.h b/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode_p.h
index 577a30c051..4015537395 100644
--- a/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode_p.h
+++ b/src/quick/scenegraph/adaptations/software/qsgsoftwarespritenode_p.h
@@ -64,6 +64,7 @@ class QSGSoftwareSpriteNode : public QSGSpriteNode
 {
 public:
     QSGSoftwareSpriteNode();
+    ~QSGSoftwareSpriteNode() override;
 
     void setTexture(QSGTexture *texture) override;
     void setTime(float time) override;
@@ -81,7 +82,7 @@ public:
 
 private:
 
-    QSGSoftwarePixmapTexture *m_texture;
+    QSGSoftwarePixmapTexture *m_texture = nullptr;
     float m_time;
     QPoint m_sourceA;
     QPoint m_sourceB;