File indexing completed on 2024-05-12 04:19:59

 #include <QBuffer>
 #include <QCoreApplication>
 #include <QDebug>
 #include <QElapsedTimer>
 #include <QFile>
 #include <QImage>
 #include <QImageReader>
 
 const int ITERATIONS = 2;
 const QSize SCALED_SIZE(1280, 800);
 
 static void bench(QIODevice *device, const QString &outputName)
 {
     QElapsedTimer chrono;
     chrono.start();
     for (int iteration = 0; iteration < ITERATIONS; ++iteration) {
         qDebug() << "Iteration:" << iteration;
 
         device->open(QIODevice::ReadOnly);
         QImageReader reader(device);
         QSize size = reader.size();
         size.scale(SCALED_SIZE, Qt::KeepAspectRatio);
         reader.setScaledSize(size);
         QImage img = reader.read();
         device->close();
 
         if (iteration == ITERATIONS - 1) {
             qDebug() << "time:" << chrono.elapsed();
             img.save(outputName, "png");
         }
     }
 }
 
 int main(int argc, char **argv)
 {
     QCoreApplication app(argc, argv);
     if (argc != 2) {
         qDebug() << "Usage: imageloadbench <file.jpg>";
         return 1;
     }
 
     const QString fileName = QString::fromUtf8(argv[1]);
 
     QFile file(fileName);
     if (!file.open(QIODevice::ReadOnly)) {
         qDebug() << QStringLiteral("Could not open '%1'").arg(fileName);
         return 2;
     }
     QByteArray data = file.readAll();
     QBuffer buffer(&data);
 
     qDebug() << "Using Qt loader";
     bench(&buffer, "qt.png");
 
     return 0;
 }