Using hardware acceleration(GPU) for QWidget::paintEvent()

[SilverSurfer]

How would I convert below code to use hardware rendering ?

1. My BaseWidget class has to be a custom QWidget.
2. Do I have to perform hardware checks before writing any GPU related code?
3. Will OpenGLWidget help ?

BaseWidget::BaseWidget()
{
  ...
m_pCanvas = new QWidget;
m_pQVBoxLayout->addWidget(m_pCanvas);
this->setLayout(m_pQVBoxLayout); 
    ...
}

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

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

[SGaist]

Hi,

1. Why ?
2. Depends on your target
3. Might be. QWidget doesn't use hardware acceleration.

[SilverSurfer]

@SGaist

Thanks for the reply

1. Has to be a QWidget because the host software API takes Qwidget object as an argument.
2. I guess OpenGL should relieve me of that checks.

[SGaist]

2. If you are sure that the target has a GPU.

[SilverSurfer]

@SGaist
Yes it does have a GPU.

What does Qt use for drawing on Windows? GDI ?

[SGaist]

It uses the raster engine. See here for historical informations.