29     EventDeviceKind, GpuDisplayError, GpuDisplayFramebuffer,
554     pub fn open_display(display: Option<&str>) -> Result<DisplayX, GpuDisplayError> {  in open_display()  argument
555         let wait_ctx = WaitContext::new().map_err(|_| GpuDisplayError::Allocate)?;  in open_display()
559             Some(Err(_)) => return Err(GpuDisplayError::InvalidPath),  in open_display()
572                 None => return Err(GpuDisplayError::Connect),  in open_display()
577                 .map_err(|_| GpuDisplayError::Allocate)?;  in open_display()
581                 return Err(GpuDisplayError::RequiredFeature("xshm extension"));  in open_display()
586                 .ok_or(GpuDisplayError::Connect)  in open_display()
614                 return Err(GpuDisplayError::RequiredFeature("no matching visual"));  in open_display()
722     ) -> Result<u32, GpuDisplayError> {  in create_surface()  argument
724             return Err(GpuDisplayError::Unsupported);  in create_surface()
781     ) -> Result<u32, GpuDisplayError> {  in import_dmabuf()  argument
782         Err(GpuDisplayError::Unsupported)  in import_dmabuf()
801     fn import_event_device(&mut self, event_device: EventDevice) -> Result<u32, GpuDisplayError> {  in import_event_device()  argument
811             .map_err(|_| GpuDisplayError::Allocate)?;  in import_event_device()