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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 5.15
Affects Version/s: 5.5.1, 5.12
Component/s: GUI: High-DPI, QPA
Labels:
None
Environment:
OSX 10.11.2 multiple monitors mixed retina and non-retina

Platform/s:

macOS

Description

When multiple monitors present and one of them is retina and second is non retina:

What I expect
When I move application between displays icons change accordingly
What I have
On retina it looks ok, but when I move to non-retina display, icons looks terribly, because it only downscale from retina icons

Code works fine, when only one monitor is present. On retina it chooses high dpi icons on non-retina low dpi icons. Problem is only mixed multiple monitors.

#include <QtGui>
#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.setAttribute(Qt::AA_UseHighDpiPixmaps, true);

    QTreeView treeView;
    QFileSystemModel model;
    treeView.setModel(&model);
    QModelIndex index = model.setRootPath("/");
    treeView.setRootIndex(index);

    treeView.show();
    return a.exec();
}

#include "main.moc"

I also have tried to change it manually, but devicePixelRatio always gave me bad result. Maybe not prepared for mixed screens.
I expected
devicePixelRatio 2 for retina screen
and 1 for non retina screen
I got
Always 2 for all displays when retina monitor was present

void Window::moveEvent(QMoveEvent *event)
{
 int number = QApplication::desktop()->screenNumber(this);
 auto screen = QApplication::desktop()->screen(number);
 qDebug() << screen->devicePixelRatio();
 qDebug() << "screen number: " << number;
 qDebug() << "screen->devicePixelRatio();" << screen->devicePixelRatio();
 qDebug() << "screen->logicalDpiY();" << screen->logicalDpiY();
 }