xwininfo/xdpyinfo seems to confirm the red and blue channels are
reversed for GLX windows:

  visual:
    visual id:    0xb4
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits

versus non-GLX windows:

  visual:
    visual id:    0x28
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff, 0xff00, 0xff0000
    significant bits in color specification:    8 bits

However the problem is not as simple as changing a pixel format. Xmir is
running in rooted mode, so we only get to choose one visual for the
whole display at start-up. So we need to find a way to force GLX to use
the correct visual, or to force XComposite to mix the colours correctly.
Because it's really out of Mir's control...

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https://bugs.launchpad.net/bugs/1573470

Title:
  BQ M10 tablet. Libreoffice Impress display wrong colors

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