Function cgimage_render_bgra_into 

pub unsafe extern "C" fn cgimage_render_bgra_into(
    image: *const c_void,
    dest: *mut u8,
    dest_capacity: usize,
) -> usize

Render the CGImage directly as BGRA (the source pixel layout for every ScreenCaptureKit-produced CGImage). Saves the per-pixel channel-swap that cgimage_render_rgba_into forces — measured at ~20 ms per 4K screenshot. Use when the consumer (Metal, wgpu, ffmpeg) accepts BGRA natively.