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Custom Fonts From The File Pool

Hi all,

I need to use a custom font for my experiment which I want to place in the File Pool so the experiment is portable and I don't need to ask the IT Department to get involved! However OpenSesame won't use any font I place in the File Pool.

I have made sure the font is TTF and have used the syntax from here, namely:

draw textline 0.0 0.0 "This will be inconsolata" font_family="inconsolata"

But still no joy. The font works fine when I install it and select it from the Font Selection Dialogue, so I know the font itself is fine, so it must be OpenSesame or my code! I have tried the same thing on both Windows and Mac, and have installed the latest version of OS to no avail.

The code in question is below, with a screenshot attached showing the File Pool contents.

draw textline center=1 color=Black font_bold=no font_family="Open" font_italic=no font_size=50 html=yes show_if=always text="Test using file pool font" x=0 y=-128 z_index=0

Any assistance would be really appreciated, I need to start running my experiment ASAP and this is the last thing in the way! 😥

Thanks all, Rich


  • Hi Rich,

    Thanks for bringing this to our attention. It's a bug that was introduced with the new text-rendering system in OpenSesame 3.2. We'll fix this in an upcoming maintenance release. But for now, you can register your font (from the file pool) with a script like the one below. This script needs to be put in the prepare phase of an inline_script item at the start of the experiment.

    from qtpy.QtGui import QFontDatabase
    from openexp._canvas._richtext import richtext
    font = 'test' # The name of the font in the pool, without .ttf
    # Register the font with OpenSesame
    fdb = QFontDatabase()
    font_id = fdb.addApplicationFont(pool[font + '.ttf'])
    print('font_id = {}'.format(font_id))
    font_families = fdb.applicationFontFamilies(font_id)
    print('font_families = {}'.format(font_families))
    richtext.font_substitutions.append((font_families[0], font))

    Hope this helps!


  • Hi Sebastian, thank you for your help.

    I put that code in but the experiment crashes now, throwing a python error.

    If I comment out all lines from "fdb = ..." downwards then the experiment runs. But as soon as "fdb = ..." is allowed to run, python crashes.

    It's the same on Windows and Mac. Any idea how to get round this?

    Many thanks,


  • I would also be interested in solving this issue.

    Thank you,


  • Hi @Emma and @Richie ,

    If this crashes, then I suggest to, as a temporary workaround, either install the fonts on the systems that you will use, or render the text as bitmaps. That's not ideal, but it should be doable. And, as I said above, for the next maintenance release this issue should be fixed!



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