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output/cursor: deferred cursor move

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This feature is meant to be used with VRR / Adaptive Sync.
Currently cursor move drives the display at the poll rate of the mouse.
This adds a deferred delay for a variety situations:
To save power on battery
To maintain smooth video playback (i.e. render video 30fps at 60 or 120fps)
To maintain smooth gaming experience (i.e. only enforce redraw at VRR minimum Hz)

I've tried to make it as unopinionated as possible, while also reducing
complexity for downstream developers.

The design should be backwards compatible, as long as
wlr_set_cursor_max_latency() is never called wlr_cursor_move() should act as
normal

I considered using wl_signals, but I'm not familiar with the interface, and it
felt somewhat overkill.

There's a reference implementation in branch deferred-cursor-move:
github:YellowOnion/sway
This commit is contained in:
Daniel Hill 2023-08-28 17:08:10 +12:00
parent d98a3eb492
commit 47f8cefad8
6 changed files with 103 additions and 7 deletions
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4
include/util/time.h
View file

@ -4,6 +4,8 @@
#include <stdint.h>
#include <time.h>
static const long NSEC_PER_SEC = 1000000000;
/**
* Get the current time, in milliseconds.
*/
@ -30,4 +32,6 @@ void timespec_from_nsec(struct timespec *r, int64_t nsec);
void timespec_sub(struct timespec *r, const struct timespec *a,
const struct timespec *b);
int32_t mhz_to_nsec(int32_t mhz);
#endif