QPainter declared inside a run function creates artifact.
- by yan bellavance
I am rendering a QPixmap inside of a QThread. the code to paint is inside a function. If I declare the painter inside the drawChart function everything seems ok but if I declare the painter inside the run function the image is wrong in the sense that at the edge of a black and white area, the pixels at the interface are overlapped to give a grey. Does anyone know why this is so? Could it be because of the nature of the run function itself?
//This is ok
void RenderThread::run()
{
QImage image(resultSize, QImage::Format_RGB32);
drawChart(&image);
emit renderedImage(image, scaleFactor);
}
drawChart(&image){
QPainter painter(image);
painter.doStuff()(;
...
}
//This gives a image that seems to have artifacts
void RenderThread::run()
{
QImage image(resultSize, QImage::Format_RGB32);
QPainter painter(image);
drawChart(painter);
emit renderedImage(image, scaleFactor);
}
drawChart(&painter){
painter.doStuff()(;
...
}
