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Details

Type: Bug
Resolution: Out of scope
Priority: Not Evaluated
Fix Version/s: None
Affects Version/s: 4.8.6
Component/s: Widgets: GraphicsView
Labels:
None
Environment:
Mac OS 10.9

Description

On a high-DPI screen, widgets proxied by a QGraphicsProxy are rendered at a low DPI. The example below draws a widget and a proxy widget; the proxy looks much worse.

This has been fixed in Qt 5.2.12 – would it be possible to backport the fix to Qt 4.8.x?

main.cpp

#include <QWidget>
#include <QPainter>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QApplication>

class Circle : public QWidget
{
public:
    Circle(QWidget* parent=NULL)
        : QWidget(parent)
    {
        this->setFixedSize(60, 60);
    }

    void paintEvent(QPaintEvent* event)
    {
        QPainter painter(this);
        painter.setBrush(QBrush(Qt::red));
        painter.drawEllipse(10, 10, 40, 40);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QGraphicsScene scene;
    QGraphicsView view(&scene);
    Circle c1(&view);
    Circle c2;
    scene.addWidget(&c2);
    view.show();
    view.raise();
    return a.exec();
}