issue-221 add FEATURE_LV_FOCUS_BOX_AUTOHIDE to features list in 6D2

[evgeniimv]

This is my first interaction/contribution to the project. So I had to configure my environment to have files to compile and to build a working ZIP.
The motivation to contribute to the project was the fact that Im the owner of 6D Mark II, and I want to have my LiveView with AF w/o unnecessary overlays on the screen.

I created an issue to track activity on a development #221 It basically explains that it would be nice to have a feature to hide a Focus Box while using a LiveView mode.
This will essentially help to achieve a Clean HDMI since the rest can be removed/cleared with INFO button (basic functionality).

Testing.
After compilation/packaging with make -j6 (actually I had to use a bit updated command because Im not allowed to modify /usr/bin on a corp laptop)

make -j6 CC=/opt/homebrew/bin/arm-none-eabi-gcc AS=/opt/homebrew/bin/arm-none-eabi-as AR=/opt/homebrew/bin/arm-none-eabi-ar OBJCOPY=/opt/homebrew/bin/arm-none-eabi-objcopy LD=/opt/homebrew/bin/arm-none-eabi-ld READELF=arm-none-eabi-readelf STRIP=/opt/homebrew/bin/arm-none-eabi-strip

With slight modifications for python3 and gstat I managed to have it packaged w/o errors.

Then with files generated in build/zip I reinstalled build on Canon 6D2 and verified the functionality.

IMG_2694.mov

On the top header I see the error message EFLensComTask: stack warning: free=232 used=792 which seems to be flaky appearing from time to time.
I guess there could be a potential thread(s) optimisation needed. I will give more updates if it causes issues on longer use.

[evgeniimv]

Update, atually Focus Box remains on the screen, when used with HDMI output. This feature, only clears Focus Box from the Canon display.
Basically means we need full fledged Clear HDMI feature.
Sorry for a confusion. I will continue looking into this

[reticulatedpines]

Yup, the newer cams draw in a different way, and it means our old code doesn't work.

If you trace what FEATURE_LV_FOCUS_BOX_AUTOHIDE enables, the work is done in clear_lv_afframe(), tweaks.c

You may want to join our discord, to ask questions about the differing graphics layers. It's a lot to go into on here.

[reticulatedpines]

For the stack warning, that's our code, see tskmon.c. We have a few exceptions already, where stock tasks are very close to the max stack limit. I don't see the one you mention, so I'd like to understand what triggers it before adding another exception.

195         #if defined(CONFIG_200D) || defined(CONFIG_6D2)
196         // this might be CONFIG_DIGIC_VII
197         if (streq(task_name, "RTCMgr") && free > 128)
198             return; // RTCMgr uses 796 of 1024, 228 free
199         if (streq(task_name, "idle") && free > 64)
200             return; // in Play mode, uses 128 of 256, 128 free
201         #endif