Merge integration refs/builds/qtci/dev/1618381531

examples/corelib/threads/mandelbrot/main.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -52,11 +52,43 @@
 
 #include <QApplication>
 
+#include <QScreen>
+
+#include <QCommandLineParser>
+#include <QCommandLineOption>
+#include <QDebug>
+#include <QRect>
+
 //! [0]
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription("Qt Mandelbrot Example");
+    parser.addHelpOption();
+    parser.addVersionOption();
+    QCommandLineOption passesOption("passes", "Number of passes (1-8)", "passes");
+    parser.addOption(passesOption);
+    parser.process(app);
+
+    if (parser.isSet(passesOption)) {
+        const auto passesStr = parser.value(passesOption);
+        bool ok;
+        const int passes = passesStr.toInt(&ok);
+        if (!ok || passes < 1 || passes > 8) {
+            qWarning() << "Invalid value:" << passesStr;
+            return -1;
+        }
+        RenderThread::setNumPasses(passes);
+    }
+
     MandelbrotWidget widget;
+    const auto geometry = widget.screen()->availableGeometry();
+    widget.resize((2 * geometry.size()) / 3);
+    const auto pos = (geometry.size() - widget.size()) / 2;
+    widget.move(geometry.topLeft() + QPoint(pos.width(), pos.height()));
+
     widget.show();
     return app.exec();
 }

examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -73,6 +73,8 @@ MandelbrotWidget::MandelbrotWidget(QWidget *parent) :
     pixmapScale(DefaultScale),
     curScale(DefaultScale)
 {
+    help = tr("Use mouse wheel or the '+' and '-' keys to zoom. "
+              "Press and hold left mouse button to scroll.");
     connect(&thread, &RenderThread::renderedImage,
             this, &MandelbrotWidget::updatePixmap);
 
@@ -80,8 +82,6 @@ MandelbrotWidget::MandelbrotWidget(QWidget *parent) :
 #if QT_CONFIG(cursor)
     setCursor(Qt::CrossCursor);
 #endif
-    resize(550, 400);
-
 }
 //! [1]
 
@@ -127,8 +127,9 @@ void MandelbrotWidget::paintEvent(QPaintEvent * /* event */)
     }
 //! [8] //! [9]
 
-    QString text = tr("Use mouse wheel or the '+' and '-' keys to zoom. "
+    QString text = help;
-                      "Press and hold left mouse button to scroll.");
+    if (!info.isEmpty())
+        text += ' ' + info;
     QFontMetrics metrics = painter.fontMetrics();
     int textWidth = metrics.horizontalAdvance(text);
 
@@ -169,6 +170,9 @@ void MandelbrotWidget::keyPressEvent(QKeyEvent *event)
     case Qt::Key_Up:
         scroll(0, +ScrollStep);
         break;
+    case Qt::Key_Q:
+        close();
+        break;
     default:
         QWidget::keyPressEvent(event);
     }
@@ -226,6 +230,8 @@ void MandelbrotWidget::updatePixmap(const QImage &image, double scaleFactor)
     if (!lastDragPos.isNull())
         return;
 
+    info = image.text(RenderThread::infoKey());
+
     pixmap = QPixmap::fromImage(image);
     pixmapOffset = QPoint();
     lastDragPos = QPoint();

examples/corelib/threads/mandelbrot/mandelbrotwidget.h

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -86,6 +86,8 @@ private:
     QPixmap pixmap;
     QPoint pixmapOffset;
     QPoint lastDragPos;
+    QString help;
+    QString info;
     double centerX;
     double centerY;
     double pixmapScale;

examples/corelib/threads/mandelbrot/renderthread.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -51,8 +51,14 @@
 #include "renderthread.h"
 
 #include <QImage>
+
+#include <QElapsedTimer>
+#include <QTextStream>
+
 #include <cmath>
 
+int RenderThread::numPasses = 8;
+
 //! [0]
 RenderThread::RenderThread(QObject *parent)
     : QThread(parent)
@@ -98,6 +104,7 @@ void RenderThread::render(double centerX, double centerY, double scaleFactor,
 //! [3]
 void RenderThread::run()
 {
+    QElapsedTimer timer;
     forever {
         mutex.lock();
         const double devicePixelRatio = this->devicePixelRatio;
@@ -116,13 +123,14 @@ void RenderThread::run()
         QImage image(resultSize, QImage::Format_RGB32);
         image.setDevicePixelRatio(devicePixelRatio);
 
-        const int NumPasses = 8;
         int pass = 0;
-        while (pass < NumPasses) {
+        while (pass < numPasses) {
             const int MaxIterations = (1 << (2 * pass + 6)) + 32;
             const int Limit = 4;
             bool allBlack = true;
 
+            timer.restart();
+
             for (int y = -halfHeight; y < halfHeight; ++y) {
                 if (restart)
                     break;
@@ -165,8 +173,20 @@ void RenderThread::run()
             if (allBlack && pass == 0) {
                 pass = 4;
             } else {
-                if (!restart)
+                if (!restart) {
+                    QString message;
+                    QTextStream str(&message);
+                    str << " Pass " << (pass + 1) << '/' << numPasses
+                        << ", max iterations: " << MaxIterations << ", time: ";
+                    const auto elapsed = timer.elapsed();
+                    if (elapsed > 2000)
+                        str << (elapsed / 1000) << 's';
+                    else
+                        str << elapsed << "ms";
+                    image.setText(infoKey(), message);
+
                     emit renderedImage(image, requestedScaleFactor);
+                }
 //! [5] //! [6]
                 ++pass;
             }

examples/corelib/threads/mandelbrot/renderthread.h

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -72,6 +72,10 @@ public:
     void render(double centerX, double centerY, double scaleFactor, QSize resultSize,
                 double devicePixelRatio);
 
+    static void setNumPasses(int n) { numPasses = n; }
+
+    static QString infoKey() { return QStringLiteral("info"); }
+
 signals:
     void renderedImage(const QImage &image, double scaleFactor);
 
@@ -88,6 +92,7 @@ private:
     double scaleFactor;
     double devicePixelRatio;
     QSize resultSize;
+    static int numPasses;
     bool restart = false;
     bool abort = false;