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  1. Qt
  2. QTBUG-92930

QRawFont::advancesForGlyphIndexes seems to ignore KernedAdvances

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P3: Somewhat important P3: Somewhat important
    • None
    • 5.14.2
    • GUI: Font handling
    • None
    • Kubuntu 20.20, qt installed from system packages.
    • Linux/X11

      I've been trying to render text using QRawFont but it seems it doesn't actually handle kerning correctly.

       

      I'm calling

      advancesForGlyphIndexes(glyphs, QRawFont::UseDesignMetrics|QRawFont::KernedAdvances)

      The QRawFont being created from a QFont with family "Noto Sans", style "Bold", and point size 36.

      Attached some screenshots comparing to how a QTextDocument renders it (outline) vs the result from QRawFont (filled).

      The QRawFont result is kept the same but the QTextDocument is shown with kerning enabled and disabled.

      The one where kerning is disable matches perfectly, while the one with kerning enable is off.

       

        1. QTBUG-92930_Droid_Sans.png
          QTBUG-92930_Droid_Sans.png
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        2. QTBUG-92930_Noto_Sans.png
          QTBUG-92930_Noto_Sans.png
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        3. Screenshot_20210419_101930.png
          Screenshot_20210419_101930.png
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        4. Screenshot_20210419_102716.png
          Screenshot_20210419_102716.png
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        5. Screenshot_20210422_094600.png
          Screenshot_20210422_094600.png
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            esabraha Eskil Abrahamsen Blomfeldt
            glax Mattia Basaglia
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              Created:
              Updated:

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