Draft: winemac: Use IOSurface to update native window layers instead of CGImage.
This consolidates the two separate CGImage
s (colorImage
and shapeImage
) previously used in WineContentView
into a single IOSurface
that also holds the window mask information in its alpha channel now.
The alpha channel is now being updated in macdrv_surface_flush
, whenever the shape changes (and stores that change for the next update, to also keep the front buffer in sync).
This reduces the delay from setting a CGImage
to a layer from 50ms to about 1.5ms in the IOSurface
case (also accounting for vImageSelectChannels_ARGB8888
operation).
Based on a patch by @bshanks.
I am already putting it out for feedback, but I will so some more testing to see how the performance impact of this is and do more exhaustive testing with shaped windows.
Ideally the double buffer solution can be avoided as well... Also the HBITMAP
for the windows is currently backed by a CGDataProviderRef
and could also become an IOSurface
I believe.