Drawing Images in Widget PaintEvent using existing buffer

SilverSurfer

Hi,
I need to draw Image on a widget without performing any copy operation.
Please refer code below

//supposed to be called 30 times a second.
BaseWidget::getImageData(uchar* buf, size_t size)
{
   //copy happening here.
    m_pQPixmap->loadFromData(buf,size,"BMP");
    this->update();

} 
BaseWidget::paintEvent()
{
...
        painter.drawPixmap(rect,*m_pQPixmap,
                      m_pQImage->rect());
  
...
}

Related To: https://forum.qt.io/topic/87175/qwidget-flickering-for-frame-by-frame-streaming-of-video/11

SGaist

Hi,

See my answer one the other thread.