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  1. Qt
  2. QTBUG-97645

QWindowsFontEngineDirectWrite ignores QFont::NoAntialias flag

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Details

    • Windows
    • 421e7621f (dev), b62b6094d (6.7), e88c2a3b3 (tqtc/lts-6.5)

    Description

      When HiDPI is on, Qt forces to draw text using QWindowsFontEngineDirectWrite. If the text can be drawn using the glyph cache, QWindowsFontEngineDirectWrite::imageForGlyph() is called to render the glyph. But NoAntialias flag is ignored.

      When using GDI font engine (HiDPI is off), NONANTIALIASED_QUALITY is set: https://github.com/qt/qtbase/blob/5.15.2/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase.cpp#L1800-L1801

      When using DirectWrite font engine (HiDPI is on), there is no code to turn off antialiasing (DWRITE_RENDERING_MODE_ALIASED?): https://github.com/qt/qtbase/blob/5.15.2/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite.cpp#L196-L203

      This only happens when drawing small texts with the glyph cache.

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-112503 Disabling font antialiasing does not work.

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
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              esabraha Eskil Abrahamsen Blomfeldt
              mingxiang Mingxiang Xu
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                Created:
                Updated:
                Resolved:

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