QImage.scaled: Crash when using QCoreApplication

Steps:

• Instantiate a Q(Gui)Application
• Delete it
• Instantiate a QCoreApplication
• Create a QImage
• call scaled() on that image
• run the application

Expected:

• No crash

Reality:

• Crash

 

reproducible with this code:

#include <QApplication>
#include <QImage>

#include <memory>

namespace
{
// Copied from the QT Doc examples.
// https://doc.qt.io/qt-5/qimage.html
QImage createImage()

{ QImage image(3, 3, QImage::Format_RGB32); QRgb value; value = qRgb(189, 149, 39); // 0xffbd9527 image.setPixel(1, 1, value); value = qRgb(122, 163, 39); // 0xff7aa327 image.setPixel(0, 1, value); image.setPixel(1, 0, value); value = qRgb(237, 187, 51); // 0xffedba31 image.setPixel(2, 1, value); return image; }

}

int main(int argc, char *argv[])

{ auto app = std::make_unique<QApplication>(argc, argv); app.reset(); auto core_app = std::make_unique<QCoreApplication>(argc, argv); auto image = createImage(); auto scaled_image = image.scaled(5,5,Qt::KeepAspectRatio); return app->exec(); }