问在非GUI线程中生成QPixmap

EN

#include <QtWidgets>

struct Chunk
{
    QImage blocks;
    QDateTime time;
};

Q_DECLARE_METATYPE(Chunk)

class Thread: public QThread{
    Q_OBJECT
public:
    using QThread::QThread;
    ~Thread() { quit(); wait();}
    Q_SIGNAL void sendChunk(const Chunk &);
protected:
    void run() override{

        while (true) {

            Chunk chunkResponse;
            QImage image(128, 128, QImage::Format_ARGB32_Premultiplied);
            image.fill(Qt::transparent);

            QPainter p(&image);

            for(int x=0; x<256; x+=2)
            {
                for(int z=0; z<256; z+=2)
                {
                    QColor color(qrand() % 256, qrand() % 256, qrand() % 256);
                    p.setPen(color);
                    p.drawPoint(x/2, z/2);
                }
            }

            p.end();
            chunkResponse.blocks = image;
            chunkResponse.time = QDateTime::currentDateTime();
            Q_EMIT sendChunk(chunkResponse);
            QThread::msleep(10);
        }
    }
};


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QLabel w;
    w.setFixedSize(128, 128);
    Thread thread;
    QObject::connect(&thread, &Thread::sendChunk, [&](const Chunk & chunk){
        w.setPixmap(QPixmap::fromImage(chunk.blocks));
        qDebug()<<chunk.time.toString();
    });
    thread.start();
    w.show();
    return a.exec();
}

#include "main.moc"