QPixmap and SVG

Question

How would you suggest to handle svg with QPixmap?

The construct QPixmap(":/myfile.svg"); then call of scaled() does not work. The QPixmap gets pixelised.

Thx.

Poinsettia

Answer 1

You should use SVGRenderer to render it onto a QImage. From there you can convert to a QPixmap with QPixmap::convertFromImage.

Vicariate

Thx, I did like suggested here : #8552190 – Poinsettia

It is possible to create QPainter over QPixmap and render SVG directly to the QPixmap. – Cyclist

Answer 2

Now there is much simpler way without needing of SVG module

QIcon("filepath.svg").pixmap(QSize())

So simple and works fine. Atleast in my case it worked.

Springing

At least with respect to the limited use case of icons, this should now be the accepted answer. Note that the QIcon::addFile() method also implicitly accepts SVG files now, permitting each icon mode and state to be associated with its own SVG file. – Irreligion

This does not scale the SVG up, if it was smaller than this size, it stays the same. – Deepdyed

This is great. But how do you achieve the same thing by creating a scalable icon from an bytearray containing SVG? – Taxi

Answer 3

Something like that:

QSvgRenderer renderer(svg_file_name);
QPixmap pm(width, height);
pm.fill(fill_color);
QPainter painter(&pm);
renderer.render(&painter, pm.rect());

Cyclist

Answer 4

On Qt5.12 i managed to display SVG icons without pixellisation in a QLabel:

QPixmap logoPixmap(":my-logo.svg"); // set your logo here
auto logoLabel = new QLabel(this);
logoLabel->setPixmap(logoPixmap);
logoLabel->setScaledContents(true);
logoLabel->setFixedSize(176, 61); // set your size here

Glassware