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The wayland protocol, as X, uses timestamps to match up certain requests with input events. The problem is that sometimes we need to send out an event that doesn't have a corresponding timestamped input event. For example, the pointer focus surface goes away and new surface needs to receive a pointer enter event. These events are normally timestamped with the evdev event timestamp, but in this case, we don't have a evdev timestamp. So we have to go to gettimeofday (or clock_gettime()) and then we don't know if it's coming from the same time source etc. However for all these cases we don't need a real time timestamp, we just need a serial number that encodes the order of events inside the server. So we introduce a serial number mechanism that we can use to order events. We still need real-time timestamps for actual input device events (motion, buttons, keys, touch), to be able to reason about double-click speed and movement speed so events that correspond to user input carry both a serial number and a timestamp. The serial number also give us a mechanism to key together events that are "logically the same" such as a unicode event and a keycode event, or a motion event and a relative event from a raw device. |
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