This prevents ABBA deadlocks caused by taking a hardware resource lock then delivering events at the same time another thread is taking a hardware resource lock from an event watch callback.
Fixes https://github.com/libsdl-org/SDL/issues/15709
This also delays pen proximity out events to make sure that the pen is really gone before delivering them. On Android, you get a HOVER_EXIT event when the pen contacts the surface, which we don't want to treat as the pen leaving proximity.
Otherwise, the quit event can be sent prematurely. The topmost status must be queried and cached before sending the close request event, as the window may be destroyed in an event handler.
Windows may be destroyed in event handlers, so check the window validity after pushing window events onto the queue to ensure that the window and its properties are still valid.
At best, this is a no-op.
At worst, it might:
- Clobber a signal handler someone registered after us
- Overwrite the signal mask or flags
- Cause unregistration to fail (sigaction() isn't guaranteed to return the exact pointer passed to signal())
If video is initialized, the main thread is the one that initialized video, otherwise if events are initialized, the main thread is the thread that initialized events, otherwise the main thread is the one that called the main function.
Fixes https://github.com/libsdl-org/SDL/issues/14511
Now everything will attempt to track pens through proximity changes (instead
of removing the pen entirely). testpen.c has been updated to reflect this.
Some platforms and devices are better at this than others, but this seems like
a significant usability improvement across the board.
Fixes#12992.
DBus does not require a video backend, and DBus messages still need to be processed even when a video backend is not initialized. Move the DBus pump call to the main event message pump function so that DBus events are still dispatched, even when a video backend has not been initialized.
Adds support for animated cursors on Cocoa, Wayland, Win32, and X11.
testcursor can take a semicolon separated list of filenames and load an animated cursor from them.
Tray events on *nix platforms usually run over DBus, and the events subsequently aren't delivered via the window event queue. As a result, SDL_WaitEvent() won't unblock when tray events arrive, particularly if there is no currently active window.
Wake up periodically to poll when tray items are active to avoid blocking the delivery and processing of tray events.
If the application is waiting in SDL_WaitEvent(), we still need to run event loop maintenance in between calls to Android_PumpEvents().
Fixes the testautomation events_mainThreadCallbacks() test on Android.
