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These events fire for other things, such as pressing a barrel button while the pen is hovering. The correct thing to do is check IS_POINTER_INCONTACT_WPARAM in the event. If the pen is already touching or not, SDL_SendPenTouch() will do the right thing, so it's safe to call it even if we're already in the right state.
Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.
You can find the latest release and additional information at: https://www.libsdl.org/
Installation instructions and a quick introduction is available in INSTALL.md
This library is distributed under the terms of the zlib license, available in LICENSE.txt.
Enjoy!
Sam Lantinga (slouken@libsdl.org)