When pressing `i` create a screenshot of the current InfiniTime screen
by dumping it to a timestamped png or bmp file like
`InfiniSim_2022-03-08_203421.png`.
Add a new configure option `WITH_PNG` with default `ON`. When switched
to `OFF` the screenshots will be created in `bmp` format.
Fixes: https://github.com/InfiniTimeOrg/InfiniSim/issues/5
If the Alarm is set, then switch away from the Alarm Screen and turn off
display to get the "Screen is OFF" overlay. When the alarm rings the
Screen is switched to the Alarm Screen, which triggers the current
screen (for example the Clock/WatchFace) to issue an `lv_obj_clean()`
call. This call removes the `screen_off_bg` object, before the main
`refresh_sceen()` of the simulator can do it. Later the simulator tries
to remove the `screen_off_bg` object again, which is a double-free of
memory resulting in a segfault.
To prevent this segfault add a callback to the `screen_off_bg` callback
which informs the simulator, that the object has already been removed.
Fixes: https://github.com/InfiniTimeOrg/InfiniSim/issues/8
Both InfiniSim/main.cpp and SystemTask.cpp periodically called
`lv_task_handler()`. This introduces a race condition, which leads to a
segmentation fault in either the main or the SystemTasks call of
`lv_task_handler()`.
Now `main` only calls the `lv_task_handler()` if the `SystemTask` does
not (while the screen is turned off). We need this for the Simulator,
otherwise the "Screen is OFF" message won't appear, and the right mouse
button won't be recognized to wake up the simulated screen.
Fixes: https://github.com/InfiniTimeOrg/InfiniSim/issues/3
Notifications store the title and the message in the same array,
separated by a `\0`. Add the notification category as title to the
notifications.
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