Flickering/Glitching when hardware layers are enabled

A customer observed flickering in their project when enabling hardware layers. The attached example attempts to make the flickering as obvious as possible.

Test Parameters

Steps to reproduce

1. Run the attached project (Test 1 parameters are in the code)
2. Modify the parameters in Layers_Flicker_Demo.qml to match the Test 2 parameters
3. Re-run the project

Outcomes

• Test 1: No flicker on screen is observed (Expected)
• Test 2: Flickering/glitching is observed (Not expected)

The attached video shows the flickering/glitching, which is quite noticeable in the bottom (green) layer.

Notes

• This test must be done on a real board that supports hardware layers. Running it on the desktop kit will produce a very unpleasant strobing effect.
• The customer noted that generally, some layers when split between VRAM and external RAM seem to flicker.