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Sign upSupport drawing subpixel text on to transparency on OS X #1544
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OS X supports this and we'll need it to support subpixel AA on vibrant backgrounds. OS X allows setting an approximate background color with the CGContextSetFontSmoothingBackgroundColor private API.
Here's the, still open, corresponding issue in QT https://bugreports.qt.io/browse/QTBUG-39463