Good news! Alpha blending on Linux has been enabled in the newest version of REAPER!
(Somewhat unexpectedly, JS_Composite now seems to work better on Linux and macOS than on Windows.)
Also, v0.981 of the ReaScriptAPI extension has also been uploaded, with a few improvements in JS_Composite. For example, if the destination width or height is set to -1, the image will be stretched to fill the target window if the window is resized.
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