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Old 01-07-2020, 04:34 AM   #1
juliansader
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Default macOS: StretchBlt with SRCCOPY_USEALPHACHAN does not apply alpha

On my OSX High Sierra system, StretchBlt with SRCCOPY_USEALPHACHAN works fine, and transparent graphics can be drawn on top of REAPER's windows, such as:




On some users' OSX El Capitan systems, however, the graphics are drawn fully opaque.


Last edited by juliansader; 01-10-2020 at 07:48 AM.
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Old 01-10-2020, 02:39 AM   #2
juliansader
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It doesn't seem to be limited to El Capitan or 32bit systems, since at least one user with Sierra has encountered the same problem.
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