Add compatibility with lvgl9

[etag4048]

This PR adds compatibility with LVGL9.x

[etag4048]

@kisvegabor We've added compatibility with lvgl9, currently finding a solution to handle color depths 8 and 1, because not all compositors support 8bit and 1bit colors format natively.. So conversion might be necessary.

[etag4048]

Tried to add support for 8bit and 1bit color formats, lv_drivers used to support RGB332 when using a color depth of 8bits up to version release/v8.4. Since version 9.0 however, LV_COLOR_FORMAT_NATIVE is set to L8 when the color depth is set to 8 bits.

However, Wayland compositors/DRMs on the desktop don't support index based color formats, If I am not mistaken RGB565A8 and L8 are for destined for embedded targets, converting from an index-based color format to ARGB8888 is not the job of the wayland driver.

So this last commit aligns the Wayland driver to feature the same behavior as the Windows and SDL drivers. The next task would be to use RENDERING_MODE_DIRECT and flip the buffers as @WallaceIT suggested in issue #287

[kisvegabor]

Hi Erik,

Thank you! I know for sure that this update was waited by many people!

Especially at the first pass it's ok support only the common color formats. Namely

• RGB565
• RGB888
• XRGB888
• ARGB888

We won't update this repo to v9. Could you add this driver to the lvgl repo targeting this folder?

[nicusorcitu]

@anagrad

[sukesh-ak]

@kisvegabor

We won't update this repo to v9. Could you add this driver to the lvgl repo targeting this folder?

Can you suggest how to get lvgl 9.x working? I am working on nVidia Jetson Orin NX 16GB which uses Ubuntu 22 so wanted to get lvgl 9.x running on it.

[kisvegabor]

@sukesh-ak You can use e.g. this repo. It uses the builtin SDL driver of LVGL.

[vvn-git]

@etag4048 please format the code style to LVGL alike style, like "if(0) {", instead of "if(0) \n {"... I have some changes/fixes waiting to be committed to it . thanks.

[etag4048]

@vvn-git Will do during the weekend or at the beginning of next week, the documentation needs to be converted to RST, and it needs to be properly integrated with the existing build system.

[OhtokaniPinzon]

Hi @etag4048 I was working some weeks ago on lv_drivers repo to run with lvgl9. Here are my changes so far https://github.com/OhtokaniPinzon/lv_drivers/tree/lvgl9-porting-master, this fix still has some visual artiffacts when testing some demos from lvgl repo, but besides that it seems to work. Maybe both works can be combined, or maybe you can find the bugs on my fix.

[etag4048]

@OhtokaniPinzon Thank you, I will check it out soon, the day job is quite demanding lately :)