205 pub enum GrallocBackend {  enum
215     grallocs: Map<GrallocBackend, Box<dyn Gralloc>>,
222         let mut grallocs: Map<GrallocBackend, Box<dyn Gralloc>> = Default::default();  in new()
225         grallocs.insert(GrallocBackend::System, system);  in new()
235                 grallocs.insert(GrallocBackend::Minigbm, gbm_device);  in new()
242             grallocs.insert(GrallocBackend::Vulkano, vulkano);  in new()
271     fn determine_optimal_backend(&self, _info: ImageAllocationInfo) -> GrallocBackend {  in determine_optimal_backend()  argument
278         let mut _backend = GrallocBackend::System;  in determine_optimal_backend()
283             if self.grallocs.contains_key(&GrallocBackend::Minigbm) {  in determine_optimal_backend()
284                 _backend = GrallocBackend::Minigbm;  in determine_optimal_backend()
290             _backend = GrallocBackend::Vulkano;  in determine_optimal_backend()
338             .get_mut(&GrallocBackend::Vulkano)  in import_and_map()