Andreas Kling 794c81626e WindowServer: Cache the last two backing stores to make flipping faster. ...

Instead of reattaching to the shared buffer on every flip, keep a reference
to the last seen backing store GraphicsBitmap. This way we can simply
swap the two last buffers when a flip happens.

This does increase memory consumption in apps that disable double-buffering
but I'll address that issue separately.

2019-03-18 20:52:23 +01:00

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