Yes, the image is always changed when the update is invoked.
On Mon, Mar 7, 2016 at 4:43 PM, Filip Piechocki <fpiecho...@gmail.com>
wrote:
> Hi,
>
> Why are you re-creating the texture on every node update? Does the
> m_Renderer->getImage() really changes? My first guess would be that the
> texture creation from image is the most costly part here (uploading the
> texture to GPU?) and I would do this only if necessary (the image really
> changes).
>
> BR,
> Filip
>
> On Mon, Mar 7, 2016 at 3:04 PM, Jani Tykka <jty...@broadsoft.com> wrote:
>
>> 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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>
--
*Jani Tykkä*
Development Manager | BroadSoft, Inc. | +358 44 596 0587 |
jty...@broadsoft.com
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