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A comment on Dramatically reduced power usage in Firefox 70 on macOS with Core Animation. Parent comment

Re:Dramatically reduced power usage in Firefox 70 on macOS w... by pcwalton on Tuesday October 22, 2019 @11:32AM (#21324798)
It's "documented" as in "tweeted out by an Apple engineer": https://twitter.com/bciechanowski/status/874345241666437120?...

One thing that is not documented is that the IOSurface must have been created with the 'BGRA' pixel format, or it will silently render as black instead.

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Re:Dramatically reduced power usage in Firefox 70 on macOS w... by eyegor on Tuesday October 22, 2019 @03:00PM (#21327330)
I hope that 'bgra' was at least a typo of 'rgba'
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Re:Dramatically reduced power usage in Firefox 70 on macOS w... by kornholi on Tuesday October 22, 2019 @03:34PM (#21327677)
BGRA is a "weird" convention in the graphics world that goes back to at least OS/2 bitmaps, when there was no wrong answer, and has stuck since then. Since early GPUs targeted Windows (where BGRA is the native format for GDI/D2D), it makes sense that it made it this far :)
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