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Old 01-10-2020, 09:09 AM   #894
Human being with feelings
Join Date: Jul 2009
Posts: 3,219

Warning re OSX: Users of my MIDI scripts have discovered a bug in REAPER's functions for blitting transparent images on OSX. If the Metal graphics API is enabled (mostly Mojave and later, but also some older systems), alpha blending is not performed, so the blitted images are fully opaque.

Unfortunately, Justin warned that it may be difficult to implement, so I'm not sure when it will be fixed. Anyone interested may track the progress in the bug report thread: WDL/swell on OSX: BitBlt and StretchBlt: SRCCOPY_USEALPHACHAN not working.
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