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  1. Qt
  2. QTBUG-66617

QML application crash when using FontLoader with some ttf fonts

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Details

    Description

      The following code works for a lot of TTF fonts, but with some the application crashes with a SIGSEGV.

       

      import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Font test")

    FontLoader{
        id: floader
        source: "file:///opt/fonts/danielbk.ttf"
    }
    Text{
        anchors.centerIn: parent
        text: floader.name
        font.family: floader.name
    }
}

      With GDB:

      1   ??                                                                       0x7fffef0b42f3
2   ??                                                                       0x7fffef087fec
3   ??                                                                       0x7fffef08962f
4   ??                                                                       0x7fffef08f644
5   FT_Load_Glyph                                                            0x7fffef07883b
6   ??                                                                       0x7fffef0bdd81
7   FT_Load_Glyph                                                            0x7fffef078a45
8   ??                                                                       0x7fffef62b78c
9   ??                                                                       0x7fffef62e27a
10  ??                                                                       0x7fffef630080
11  ??                                                                       0x7fffef6282ee
12  QFontEngine::alphaMapForGlyph(unsigned int, QFixed, QTransform const&)   0x7ffff77cda8f
13  ??                                                                       0x7fffef6301f8
14  ??                                                                       0x7fffef6282ee
15  QFontEngine::alphaMapForGlyph(unsigned int, QFixed, QTransform const&)   0x7ffff77cda8f
16  ??                                                                       0x7fffef6301f8
17  ??                                                                       0x7fffef6282ee
18  QFontEngine::alphaMapForGlyph(unsigned int, QFixed, QTransform const&)   0x7ffff77cda8f
19  ??                                                                       0x7fffef6301f8
20  ??                                                                       0x7fffef6282ee
... <plus>  (repeat this lines more than 5000 times)                                                                                

      This font works normally using QFontDatabase and QLabel.

      Attachments

        For Gerrit Dashboard: QTBUG-66617
        # Subject Branch Project Status CR V
        223774,2 Fix infinite recursion on stack trying load empty glyhs 5.11 qt/qtbase Status: MERGED +2 0

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            laknoll Lars Knoll
            lbaudouin Leo Baudouin
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            Dates

              Created:
              Updated:
              Resolved:

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