QML can't see font ascender on Embedded device

carols

Hi All,

I have some problems to correctly visualize the font Helvetica Neue LT Std Font on an embedded device. The problem is that i 'cant see the part of the characters that are in the ascender area of the font, for example i can't see the accent of the char "À". But also for example the symbol ^ above the char "ê" is cutten. Checking the font with fontdrop.info i can confirm that the part of the characters that are cutten is the part in the ascender area.

If i run the application on PC, it works fine.
My embedded device is based on a iMx6 ULL processor. The screen resolution is 800x480.

Below the test code I am using. I'm using Qt5.8.0 both for embedded and PC.

main.cpp

{
    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);

    QtQuick2ApplicationViewer viewer;
    viewer.setSurfaceType(QSurface::OpenGLSurface);
    // Force orientation to see Maliit in landscape orientation
    QFont font("HelveticaNeueLTStd");
    font.setStretch(QFont::Condensed);
    app.setFont(font);
    viewer.setMainQmlFile(QStringLiteral("main.qml"));

    QObject::connect((QObject*)viewer.engine(), SIGNAL(quit()), &app, SLOT(quit()));
    viewer.showExpanded();
    return app.exec();
}

main.qml

import QtQuick 2.6
import QtQuick.Window 2.2

Window {
    visible: true
    width: 800
    height: 480


    Text {
        id: textEdit
        text: qsTr("ÀÀÀ")
        font.pointSize: 24
        verticalAlignment: Text.AlignVCenter
        anchors.top: parent.top
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.topMargin: 20
    }
}

Thanks!
Caro

Pablo J. Rogina

@carols is it possible that you run any other non-Qt application in that device to see what happens with the font in that case?

carols

@Pablo J. Rogina thanks for your reply! Unfortunately is not easy for me in this moment to try with a no Qt Application. Do you think it could be related to the configuration of fonts on my embedded platform?

Pablo J. Rogina

@carols said in QML can't see font ascender on Embedded device:

Do you think it could be related to the configuration of fonts on my embedded platform?

I cannot tell for sure, but I do remember some issues in the forum due to the actual font file in the device not the exact same file in the PC although having the same name...

SGaist

Hi,

Did you check that you are actually getting the font you are requesting on your device ?

carols

@SGaist thanks for the reply! Yes the font is the one that i'm requesting. I made this test: i changed the font with a font editor, i moved the letter "À" in way that the symbol above the A is under the line "ascender". In this way i can see the letter correctly. So it is a confirm that the font that i'm using is the correct one and that the problem is in the visualization of the symbol or of the part of a character that are above the "ascender" line. Please help!

carols

After other tests i verified that this issue is related to some problem in the rendering of the font.
So in the end i chose a simpler solution: i edited the font moving the "ascender" line upper in a way that now all the symbols are under this line. And now i can see alle the symbols correctly!

SGaist

Glad you found a solution and thanks for sharing !

That's a nice trick !