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Re:.NET Core Image Processing by ygra on Friday January 20, 2017 @03:39AM (#13442434)
Mono shipped a reimplementation of the types in the System.Drawing namespace which uses GDI+ (note the +) on Windows. This reimplementation is also what CoreCompat.System.Drawing is based on. To my knowledge Mono did shim a few Windows APIs, mostly related to window messages so WndProc can be overridden in a useful manner, but not actually GDI, as far as I know.
Re:.NET Core Image Processing by kodfodrasz on Friday January 20, 2017 @07:31AM (#13443317)
And the implementation was buggy as hell. When I needed to resize pictures on mono + Linux I finally had to resort to manually building libgb, writing a simple wrapper for the resizing part, and use that, as back then every other alternative as either incomplete, or pain to use and/or buggy.

Note: libgd is a well designed native library with design emphasis on simple interop wrappability.