[Interest] Quick2 OpenGL inefficiency?

[Jani Tykka]

Hi,

We are rendering QImages on QQuickItem as following:

QSGNode * DisplayItem::updatePaintNode( QSGNode * node,
UpdatePaintNodeData * /*data*/ )

{

	QSGSimpleTextureNode * n = static_cast< QSGSimpleTextureNode* >( node );

	if ( !n )

		n = new QSGSimpleTextureNode;


	n->setRect( 0, 0, width(), height() );


	delete m_Texture;


	m_Texture = window()->createTextureFromImage( m_Renderer->getImage() );

	n->setTexture( m_Texture );


	return n;

}



It seems that computers with separate GPU there is a decent amount of
CPU utilised. We are running into problems if the machine lacks GPU,
then with large images the CPU usage grows drastically. Any
suggestions how to improve large image painting on QQuickItem? With
Quick1 and painting directly on HWND/CocoaWindow we didn't experience
this high CPU usage.

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