No text displayed in GUI

[Anu Jayan]

Hello

1. I cross compiled the source code path which contains the .pro file.

[linux-devkit]:~/ti-processor-sdk-linux-am62xx-evm-08.03.00.19/example-applications/Peristaltic/src> /home/zumi/ti-processor-sdk-linux-am62xx-evm-08.03.00.19/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/qmake Peristaltic.pro
[linux-devkit]:~/ti-processor-sdk-linux-am62xx-evm-08.03.00.19/example-applications/Peristaltic/src> make

2. I was successfully able to create the executable file Peristaltic which can be run on the AM62x EVM board.

3. After the target board is booted, I have passed the following commands in the console.
   root@am62xx-evm:~# export QT_QPA_PLATFORM=eglfs
   root@am62xx-evm:~# export QT_QPA_EGLFS_NO_LIBINPUT=1

4. When I run the executable file, I get the below log. And the GUI is not displaying any text other than blocks.
   root@am62xx-evm:/Peristaltic/src# ./Peristaltic
   chmod: /dev/ttyUSB0: No such file or directory
   Cannot open device /dev/video0, exiting.
   QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.
   QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.
   QMetaObject::connectSlotsByName: No matching signal for on_pushButton_clicked()
   QMetaObject::connectSlotsByName: No matching signal for on_path_pushButton_clicked()

5. I have attached the image of the GUI, which is getting displayed. Kindly help me to resolve the issue.
   

Thanks in advance
Regards
Anu Jayan

[SGaist]

Hi,

Might be a sill question but: do you have fonts deployed on your device ?

[Anu Jayan]

Yes @SGaist

[SGaist]

Did you check the presence of the one you use with QFontDatabase ?

[Anu Jayan]

@SGaist said in No text displayed in GUI:

Did you check the presence of the one you use with QFontDatabase ?

I am not sure.

1. But I already have the "libfont" libraries added in "usr/lib/".

root@am62xx-evm:/usr/lib# ls font
libfontconfig.so libfontconfig.so.1 libfontconfig.so.1.12.0

2. Also followed the below forum link, to add the "dejavu-fonts-ttf-2.37" fonts in the same "usr/lib/".
   https://forum.qt.io/topic/99825/qfontdatabase-cannot-find-font-directory-usr-local-qt5pi-lib-fonts

root@am62xx-evm:~# cd /usr/lib/fonts/
dejavu-fonts-ttf-2.37/ ttf/
root@am62xx-evm:/usr/lib/fonts/dejavu-fonts-ttf-2.37# ls
AUTHORS BUGS LICENSE NEWS README.md fontconfig langcover.txt status.txt ttf unicover.txt

3. Still the fonts are not getting displayed in GUI & I am getting the following log.
   root@am62xx-evm:/Peristaltic/src# ./Peristaltic
   [ 50.599094] PVR_K: 865: RGX Firmware image 'rgx.fw.33.15.11.3' loaded
   [ 50.626721] PVR_K: 865: Shader binary image 'rgx.sh.33.15.11.3' loaded
   chmod: /dev/ttyUSB0: No such file or directory
   Cannot open device /dev/video0, exiting.
   QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.
   QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.
   QMetaObject::connectSlotsByName: No matching signal for on_pushButton_clicked()
   QMetaObject::connectSlotsByName: No matching signal for on_path_pushButton_clicked()

Regards
Anu Jayan

[SGaist]

Then let's start small. Write a dummy application that just contains a QLabel with some text it in and run it.

If no text is shown, print the fonts available using QFontDatabase.

[Anu Jayan]

@SGaist said in No text displayed in GUI:

Then let's start small. Write a dummy application that just contains a QLabel with some text it in and run it.

If no text is shown, print the fonts available using QFontDatabase.

Hi

1. I have created a .cpp file with the below code & cross compiled for Ti AM62x-sk EVM board.

#include <QApplication>
#include <QWidget>
#include <QLabel>
#include <QVBoxLayout>
#include <QFontDatabase>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget window;
    QVBoxLayout layout;

    QLabel label("Hello, Qt!");
    layout.addWidget(&label);

    window.setLayout(&layout);

    // Create an instance of QFontDatabase
    QFontDatabase fontDatabase;

    // Print available fonts using QFontDatabase
    QStringList availableFonts = fontDatabase.families();
    if (availableFonts.isEmpty()) {
        qDebug() << "No fonts available.";
    } else {
        qDebug() << "Available Fonts:";
        foreach (const QString &font, availableFonts) {
            qDebug() << font;
        }
    }

    window.show();

    return app.exec();
}

2. I run the executable file in target board. But I got the following print and the available fonts are not getting displayed.
   root@am62xx-evm:/TestApp# ls
   Makefile yourapp yourapp.cpp yourapp.o yourapp.pro
   root@am62xx-evm:/TestApp# ./yourapp
   No fonts available.

3. Am I missing any libraries dependencies in yocto build (or) while cross compiling with the .pro file. Can you suggest me a solution.

Regards,
Anu Jayan