Tips for MacBooks and other HiDPI displays

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The text of the GRC canvas can be changed by editing your $HOME/.gnuradio/config.conf file. Find the [grc] section and add a canvas_font_size setting: 

[grc]
canvas_font_size = 14

GNU Radio 3.7

GRC in GNU Radio 3.7 uses GTK 2.0. The UI font size (all the text that's not part of the canvas) can be changed by editing your $HOME/.gtkrc-2.0 file like so: 

gtk-font-name="Sans 14"

GNU Radio 3.8

The forthcoming GNU Radio 3.8 release has been updated to use GTK 3.0, which has native HiDPI support. To enable HiDPI support you can launch GRC like so: 

$ GDK_SCALE=2 gnuradio-companion

You may find that you want to reduce the UI font size if it becomes too large in native HiDPI mode, you can do so following the instructions for 3.7 and specifying a smaller number.

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