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Wrong text display : Qt 5.14 only

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qmlqt 5.14text corruptioncharacter encod
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  • U Ulysse
    20 Mar 2020, 15:21

    @Christian-Ehrlicher I am afraid you cannot do that when you have a 250'000 lines application.
    One has to narrow his search scope in order to solve bugs
    Thus my question : what should i look for ?
    And my that i mean particular functions calls, context, options.. anything

    Maybe you don't have any idea and that is fine, others will (even myself maybe?) and we will be able to locate the cause of the behavior
    But i won't be dismantling my whole application for obvious reasons

    Regards

    C Offline
    C Offline
    Christian Ehrlicher
    Lifetime Qt Champion
    wrote on 20 Mar 2020, 15:32 last edited by
    #8

    @Ulysse said in Wrong text display : Qt 5.14 only:

    Thus my question : what should i look for ?

    If you want to reproduce a bug, start, as already said, with a simple reproducer. If you then can't reproduce the issue - try to isolate the problem. Since it's a simple widget I'm pretty sure you don't need to touch every 250k lines...

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    • U Offline
      U Offline
      Ulysse
      wrote on 20 Mar 2020, 16:20 last edited by Ulysse
      #9

      We use the "roboto" TrueType font.
      Commenting the QFontDatabase::addApplicationFont(":/police/roboto.ttf"); line in the main removes the problem
      Has there been any changes between Qt 5.6 and Qt 5.14 that concerns TrueType fonts, or fonts in general ?

      I can upload the font file if you need me to

      Regards

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      • C Offline
        C Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on 20 Mar 2020, 16:26 last edited by
        #10

        So now that you've a point where to start - why not creating a simple reproducer??

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        U 1 Reply Last reply 20 Mar 2020, 16:57
        0
        • C Christian Ehrlicher
          20 Mar 2020, 16:26

          So now that you've a point where to start - why not creating a simple reproducer??

          U Offline
          U Offline
          Ulysse
          wrote on 20 Mar 2020, 16:57 last edited by Ulysse
          #11

          @Christian-Ehrlicher Because that is what i was doing of course
          I was not able to reproduce it though
          I verified and roboto is correctly used

          #include <QMainWindow>
          
          QT_BEGIN_NAMESPACE
          namespace Ui { class MainWindow; }
          QT_END_NAMESPACE
          
          class MainWindow : public QMainWindow
          {
              Q_OBJECT
          
          public:
              MainWindow(QWidget *parent = nullptr);
              ~MainWindow();
          
          private:
              Ui::MainWindow *ui;
          };
          
          MainWindow::MainWindow(QWidget *parent)
              : QMainWindow(parent)
              , ui(new Ui::MainWindow)
          {
              ui->setupUi(this);
          }
          
          MainWindow::~MainWindow()
          {
              delete ui;
          }
          
          #include <QApplication>
          #include <QFontDatabase>
          
          int main(int argc, char *argv[])
          {
              QApplication a(argc, argv);
              MainWindow w;
              QFontDatabase::addApplicationFont(":/police/roboto.ttf");
              w.show();
              return a.exec();
          }
          

          mainwindow.ui :

          <?xml version="1.0" encoding="UTF-8"?>
          <ui version="4.0">
           <class>MainWindow</class>
           <widget class="QMainWindow" name="MainWindow">
            <property name="geometry">
             <rect>
              <x>0</x>
              <y>0</y>
              <width>465</width>
              <height>262</height>
             </rect>
            </property>
            <property name="windowTitle">
             <string>MainWindow</string>
            </property>
            <property name="styleSheet">
             <string notr="true">QComboBox, QLabel, QAbstractSpinBox, QLineEdit, QTextBrowser, QRadioButton, QCheckBox
          {
          	font-family: &quot;Roboto Light&quot;;
          	font-size: 40px;
          	qproperty-alignment: AlignCenter;
          	color: black;
          	qproperty-contextMenuPolicy: NoContextMenu;
          }</string>
            </property>
            <widget class="QWidget" name="centralwidget">
             <layout class="QHBoxLayout" name="horizontalLayout">
              <item>
               <widget class="QLabel" name="label">
                <property name="text">
                 <string>Hello World</string>
                </property>
               </widget>
              </item>
             </layout>
            </widget>
            <widget class="QMenuBar" name="menubar">
             <property name="geometry">
              <rect>
               <x>0</x>
               <y>0</y>
               <width>465</width>
               <height>25</height>
              </rect>
             </property>
            </widget>
            <widget class="QStatusBar" name="statusbar"/>
           </widget>
           <resources/>
           <connections/>
          </ui>
          
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          • H Offline
            H Offline
            hskoglund
            wrote on 20 Mar 2020, 20:09 last edited by
            #12

            Hi, just guessing but do you get the same error if you add the font from a disk file instead of an embedded resource, say like:

            ...
            MainWindow w;
            QFontDatabase::addApplicationFont("roboto.ttf");
            w.show();
            ...
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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on 20 Mar 2020, 20:32 last edited by
              #13

              Silly idea: what if you load the font before creating your MainWindow object ?

              Instinctively, I would setup all external resources like this one before creating objects that will use them.

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              U 1 Reply Last reply 21 Mar 2020, 09:55
              4
              • SGaistS SGaist
                20 Mar 2020, 20:32

                Silly idea: what if you load the font before creating your MainWindow object ?

                Instinctively, I would setup all external resources like this one before creating objects that will use them.

                U Offline
                U Offline
                Ulysse
                wrote on 21 Mar 2020, 09:55 last edited by
                #14

                @SGaist And we have a winner ! That was the issue, thank you :)

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                0
                • E Offline
                  E Offline
                  es-w
                  wrote on 10 May 2020, 07:55 last edited by es-w 5 Oct 2020, 07:58
                  #15

                  Hi,
                  I have also had the same problem as OP but my GUI is QML and platform is Android It has a problem when I move my application from Qt 5.13.2 to Qt 5.14.2.
                  So now I just strict with Qt 5.13.2 (Even I would like to use a new feature for app bundle ) but I just curious why no one has the problem with display the wrong text after the move to Qt 5.14.2.

                  I try all method as OP and also load the font in QML and set the font to all display text but some text still displays wrong text i.e. under

                  Menu {
                     title: "Languages"
                    font: Fonts.fontDefault
                  }
                  

                  from above in GUI it's show "Languages " as below
                  de144dd8-413f-4731-a67f-7ecfd99d5a26-image.png

                  Pl45m4P 1 Reply Last reply 10 May 2020, 09:39
                  0
                  • E es-w
                    10 May 2020, 07:55

                    Hi,
                    I have also had the same problem as OP but my GUI is QML and platform is Android It has a problem when I move my application from Qt 5.13.2 to Qt 5.14.2.
                    So now I just strict with Qt 5.13.2 (Even I would like to use a new feature for app bundle ) but I just curious why no one has the problem with display the wrong text after the move to Qt 5.14.2.

                    I try all method as OP and also load the font in QML and set the font to all display text but some text still displays wrong text i.e. under

                    Menu {
                       title: "Languages"
                      font: Fonts.fontDefault
                    }
                    

                    from above in GUI it's show "Languages " as below
                    de144dd8-413f-4731-a67f-7ecfd99d5a26-image.png

                    Pl45m4P Online
                    Pl45m4P Online
                    Pl45m4
                    wrote on 10 May 2020, 09:39 last edited by
                    #16

                    @es-w

                    Did you try what @SGaist suggested?


                    If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                    ~E. W. Dijkstra

                    E 1 Reply Last reply 10 May 2020, 10:19
                    0
                    • Pl45m4P Pl45m4
                      10 May 2020, 09:39

                      @es-w

                      Did you try what @SGaist suggested?

                      E Offline
                      E Offline
                      es-w
                      wrote on 10 May 2020, 10:19 last edited by
                      #17

                      @Pl45m4 Already try it work on Windows but not for android

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                      • A Offline
                        A Offline
                        aludwig
                        wrote on 2 Aug 2024, 11:02 last edited by
                        #18

                        @es-w Did you ever figure anything out on this? I'm having the same issue with QML in Qt 5.15.8 where some text is incorrect on the same screen as some correct text. I also explicitly set the font to Roboto prior to displaying any QML. The weird part is, is the same build works on one Red Hat VM, but does not work on a slightly different RH VM.

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