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Wrong text display : Qt 5.14 only

Scheduled Pinned Locked Moved Solved General and Desktop
qmlqt 5.14text corruptioncharacter encod
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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

    1 Reply Last reply
    0
    • C Online
      C Online
      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();
          ...
          1 Reply Last reply
          0
          • S Offline
            S 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
            • S 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 :)

              1 Reply Last reply
              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 Offline
                  Pl45m4P Offline
                  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

                    1 Reply Last reply
                    0
                    • 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.

                      1 Reply Last reply
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