Function rasterizes_on_cpu 

pub fn rasterizes_on_cpu(adapter: &AdapterInfo) -> bool

Whether a host on this adapter rasterizes its frames on the CPU (crate::cpu_raster) and uploads the pixels, instead of running vello’s compute pipelines on an emulated GPU: a SwiftShader page draws its first frame this way before any pipeline compiles. Vello then draws only backdrop blurs.