[v9] backport 10915 (memory leak) #10927
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Prior to this change, the bitmap data was copied into Go first (via C.GoBytes), converted to RGBA, and then copied a second time into the RBGA image that we pass to the PNG encoder. Instead, use unsafe.Slice to get a slice backed by the Rust-managed memory. Perform the RGBA conversion in-place here, and then perform one copy from the Rust-managed memory into the Go RBGA image.
Pass Go a pointer to the CGOBitmap, otherwise Rust assumes ownership is passing through the FFI and will not free the memory when we're finished with it.
russjones
approved these changes
Mar 8, 2022
gabrielcorado
approved these changes
Mar 8, 2022
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Backports #10915