Function set_capture_device_scale 

pub fn set_capture_device_scale(scale: u32)

Draw every following capture frame at scale device pixels per logical pixel, as a HiDPI display draws it: the frame is laid out at its logical size and drawn with the window scale transform the live host uses, so text is rasterised from the glyph outlines at that size rather than enlarged afterwards (crate::headless::FrameHarness). Clamped to 1..=MAX_CAPTURE_DEVICE_SCALE.