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  1. Qt
  2. QTBUG-100112

Default font engine: same font and text rendered very differently on secondary display

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Details

    • Windows
    • 2e29a427ca2127ff7aff23049c65881d3c55bb40

    Description

      On Windows text seem quite different on different displays if the displays have different scale factors. For example if main display has the scale factor 150% and secondary display has the scale factor 100%, font will look off on the secondary display.

      The problem seems to be solved by:

      • Using the same scale factor for both displays
      • Using freetype font engine

      The difference is clearer with some fonts than others. For example with https://fonts.google.com/specimen/M+PLUS+Rounded+1c the difference is very easy to spot. Especially the upper part of some letters stand out a lot when compared to the same text on the main display and even more so with freetype font engine.

      Steps to reproduce the problem:

      • Ensure the displays have different scale factors
      • open designer
      • load the attached .ui in the designer
      • move designer window (or preview window) from one screen to another while comparing the text

      Attachments

        1. default_main_display.png
          default_main_display.png
          11 kB
        2. default_secondary_display.png
          default_secondary_display.png
          7 kB
        3. freetype_main_display.png
          freetype_main_display.png
          14 kB
        4. freetype_secondary_display.png
          freetype_secondary_display.png
          10 kB
        5. AntialiasTest.ui
          1 kB
        6. bad.png
          bad.png
          6 kB
        7. good.png
          good.png
          10 kB
        8. notepad zoom.png
          notepad zoom.png
          33 kB
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            manordheim Mårten Nordheim
            miikapernu Miika Pernu
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            Dates

              Created:
              Updated:
              Resolved:

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