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Details

Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.3, 6.4
Affects Version/s: 6.2.2
Component/s: Qt RHI
Labels:
None
Environment:
Windows 10.0.19041, Microsoft Visual Studio Professional 2019 (Version 16.11.7)

Platform/s:

Windows

Description

Below is an example that paints three rectangles with fixed sizes & positions in a QQuickWindow.

When I resize the window I expect the rectangles not to change.

Instead, the rectangles seem to change their size & position as I resize the window.

Note: this artefact does not appear if the graphics API is set to OpenGL.

Example:

#include <QGuiApplication>
#include <QQuickPaintedItem>
#include <QQuickWindow>
#include <QPainter>


class Paintable final : public QQuickPaintedItem
{
public:
    explicit Paintable(QQuickItem* parent = nullptr)
    : QQuickPaintedItem(parent)
    {
        setOpaquePainting(true);
    }

    void paint(QPainter* painter) override
    {
        QColor highlight{255, 0, 0, 50};

        painter->fillRect(QRect{QPoint{10, 0},    QSize{100, 100}}, highlight);
        painter->fillRect(QRect{QPoint{20, 20},   QSize{100, 100}}, highlight);
        painter->fillRect(QRect{QPoint{100, 100}, QSize{100, 100}}, highlight);
    }
};

int main(int argc, char* argv[])
{
    QGuiApplication app(argc, argv);

    // QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);
    auto* qquickWindow = new QQuickWindow();

    auto* paintable = new Paintable(qquickWindow->contentItem());
    paintable->setSize(QSize{1000, 1000});
    paintable->setVisible(true);
    qquickWindow->show();


    return app.exec();
}