feature(wayland): add double buffering

[WallaceIT]

Add double buffering to Wayland driver: one buffer is updated while another one is being displayed.

This doubles the memory requirement, but lowers the possibility to encounter a busy buffer when LVGL core is ready to draw.

Signed-off-by: Francesco Valla [email protected]

[WallaceIT]

Please note that the MR is marked as draft because it is still, in fact, a draft: some of the logic for a proper double buffering is still lacking. Moreover, the entire work will probably be converted to a direct_mode implementation for better performance (no data copy).

[WallaceIT]

Added carry-over of previous buffer damages, proper double-buffering logic should be in place now.

[HR1025]

And the problem https://github.com/lvgl/lv_drivers/pull/242 still exist. (I haven't found the reason so far.)

you can use weston --use-pixman to test on you machine. Thanks @WallaceIT

[HR1025]

Recently, I was studying the implementation of weston-terminal. It need some time. I think we can find a good solution from it. The code is located in weston/clients/terminal.c in weston

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