[QTBUG-66682] Unicode Characters Rendering Issues - Qt Bug Tracker

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Details

Type: Bug
Status: Reported
Priority: P2: Important
Resolution: Unresolved
Affects Version/s: 5.10.1
Fix Version/s: None
Component/s: QPA: WebGL
Labels:
None

Description

I just noticed that some Unicode characters are not being rendered properly in Qt 5.10.1 during WebGL streaming, using the following font:

https://github.com/wweir/source-han-sans-sc/blob/master/SourceHanSansSC-Light.otf

Here’s an example QML to reproduce the issue:

import QtQuick 2.10
import QtQuick.Window 2.10

Window {
    visible: true
    width: 1920
    height: 1080
    title: qsTr("Test Unicode Characters")

    FontLoader {
        id:sourceHanSancSCFontLoader
        source: "file:///opt/fonts/SourceHanSansSC-Light.otf"
    }

    function allCharacters() {
        var string = "";
        for(var i=19968;i<25343;++i) {
            string += String.fromCharCode(i)
        }
        return string
    }

    Text {
        text: allCharacters()
        anchors.centerIn: parent
        font.family: sourceHanSancSCFontLoader.name
        font.pointSize: 12
        font.weight: Font.Normal
        wrapMode: Text.Wrap
        color: "black"
        width: parent.width
        height: parent.height
    }
}