fix(arc): handle indicator padding for knob position and arc invalidation area

[liamHowatt]

Fixes #9001

Notes

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[github-actions]

Hi 👋, thank you for your PR!

We've run benchmarks in an emulated environment. Here are the results:

ARM Emulated 32b - lv_conf_perf32b

Scene Name	Avg CPU (%)	Avg FPS	Avg Time (ms)	Render Time (ms)	Flush Time (ms)
All scenes avg.	28	38	7	7	0

Detailed Results Per Scene

Scene Name	Avg CPU (%)	Avg FPS	Avg Time (ms)	Render Time (ms)	Flush Time (ms)
Empty screen	11	33	0	0	0
Moving wallpaper	2	33	1	1	0
Single rectangle	0	50	0	0	0
Multiple rectangles	0	40 (+1)	0	0	0
Multiple RGB images	0	39	0	0	0
Multiple ARGB images	10 (-2)	41	0	0	0
Rotated ARGB images	55 (+1)	44	15 (+1)	15 (+1)	0
Multiple labels	6	33	0	0	0
Screen sized text	95	47	20	20	0
Multiple arcs	40	33	7 (+1)	7 (+1)	0
Containers	4	38 (+1)	0	0	0
Containers with overlay	97 (+10)	21	44	44	0
Containers with opa	12 (+2)	36 (-2)	1 (+1)	1 (+1)	0
Containers with opa_layer	18 (-2)	34	5	5	0
Containers with scrolling	45 (-2)	47 (+1)	12	12	0
Widgets demo	67	40	16	16	0
All scenes avg.	28	38	7	7	0

ARM Emulated 64b - lv_conf_perf64b

Scene Name	Avg CPU (%)	Avg FPS	Avg Time (ms)	Render Time (ms)	Flush Time (ms)
All scenes avg.	24	38	6	6	0

Detailed Results Per Scene

Scene Name	Avg CPU (%)	Avg FPS	Avg Time (ms)	Render Time (ms)	Flush Time (ms)
Empty screen	11	33	0	0	0
Moving wallpaper	1	33	0	0	0
Single rectangle	0	50	0	0	0
Multiple rectangles	0	46	0	0	0
Multiple RGB images	0	39	0	0	0
Multiple ARGB images	1	38 (+1)	0	0	0
Rotated ARGB images	29	34	9	9	0
Multiple labels	3	39 (-2)	0	0	0
Screen sized text	81 (-1)	45	17	17	0
Multiple arcs	33 (-1)	34 (+1)	6	6	0
Containers	5 (+1)	39 (+1)	0	0	0
Containers with overlay	87 (-2)	23	41	41	0
Containers with opa	16 (+2)	38	0 (-1)	0 (-1)	0
Containers with opa_layer	8	37 (+1)	1 (-1)	1 (-1)	0
Containers with scrolling	45	46	11 (-1)	11 (-1)	0
Widgets demo	66	42	15	15	0
All scenes avg.	24	38	6	6	0

Disclaimer: These benchmarks were run in an emulated environment using QEMU with instruction counting mode.
The timing values represent relative performance metrics within this specific virtualized setup and should
not be interpreted as absolute real-world performance measurements. Values are deterministic and useful for
comparing different LVGL features and configurations, but may not correlate directly with performance on
physical hardware. The measurements are intended for comparative analysis only.

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[cubic-dev-ai]

No issues found across 1 file

[AndreCostaaa]

Please add a test case when you get the chance

[uLipe]

Except for the test case, LGTM.

[kisvegabor]

Thank you! I also wanted to ask for a test.