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Currently, the SDL_Tray* structs in the unix backend are subclassed for each implementation (only dbus so far). This means that the DBus-specific members are in their own structs (SDL_Tray*DBus), which all are required to have the corresponding 'parent' struct as their first member, so that they can be cast easily and used in the more generic code. However, other SDL systems which have pluggable backends work the other way around: the 'generic' struct has an 'internal' member, which individual drivers can use to store a pointer to any internal state. This is a bit simpler to wrap one's head around -- particularly because it's consistent -- but does typically involve more memory allocations. Change the unix/DBus tray implementations to use an 'internal' pointer to match other subsystems.
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)