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Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.9.2, 6.10.0 Beta2, 6.11.0 FF
Affects Version/s: 6.9.1
Component/s: GUI: Painting
Labels:
- regression
Environment:
Arch Linux
Qt 6.9.1

Platform/s:

All
Commits:
46e7060ee (dev), 0cff18f1a (6.10), 1f9319ea9 (6.9), 29c3b512d (dev), b0adf2dcb (6.10), f4bce5b40 (6.9)

Creating a pixmap from a QIcon will sometimes choose the wrong icon file depending on the theme and scale. In this example with the Adwaita theme it chose the 16x16 png instead of the svg, which is much worse for the requested size and scale.

#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QIcon::setThemeName("Adwaita");
    QIcon icon = QIcon::fromTheme(QStringLiteral("folder-documents"));
    qDebug() << icon.availableSizes(); // QList(QSize(16, 16), QSize(128, 128))
    QPixmap pixmapRegular = icon.pixmap(QSize(128, 128), 1.0);
    qDebug() << pixmapRegular.size(); // QSize(128, 128): OK
    QPixmap pixmapScaled = icon.pixmap(QSize(128, 128), 2.0);
    qDebug() << pixmapScaled.size(); //  QSize(16, 16): wrong
}