dmabuf: cache is_disjoint property

src/cli/screenshot.rs

@@ -69,6 +69,7 @@ async fn run(screenshot: Rc<Screenshot>) {
             format: XRGB8888,
             modifier: ev.modifier,
             planes,
+            is_disjoint: Default::default(),
         };
         res.push(Ok((buf, Some(ev.drm_dev))));
     });
@@ -96,6 +97,7 @@ async fn run(screenshot: Rc<Screenshot>) {
                 format: XRGB8888,
                 modifier: ev.modifier,
                 planes: planes.take(),
+                is_disjoint: Default::default(),
             };
             res.push(Ok((buf, dev.take())))
         },

src/gfx_apis/vulkan/bo_allocator.rs

@@ -230,6 +230,7 @@ impl VulkanBoAllocator {
             format: format.format,
             modifier: modifier.modifier,
             planes,
+            is_disjoint: Default::default(),
         };
         unsafe {
             let cmd = data.command_buffer.buffer;

src/ifs/wl_drm.rs

@@ -142,6 +142,7 @@ impl WlDrmRequestHandler for WlDrm {
             format,
             modifier: INVALID_MODIFIER,
             planes: PlaneVec::new(),
+            is_disjoint: Default::default(),
         };
         if req.stride0 > 0 {
             dmabuf.planes.push(DmaBufPlane {

src/ifs/zwp_linux_buffer_params_v1.rs

@@ -93,6 +93,7 @@ impl ZwpLinuxBufferParamsV1 {
             format: format.format,
             modifier,
             planes: PlaneVec::new(),
+            is_disjoint: Default::default(),
         };
         let mut planes: Vec<_> = self.planes.borrow_mut().drain_values().collect();
         planes.sort_by_key(|a| a.plane_idx);

src/it/test_ifs/test_screenshot.rs

@@ -38,6 +38,7 @@ impl TestJayScreenshot {
             format: XRGB8888,
             modifier: ev.modifier,
             planes,
+            is_disjoint: Default::default(),
         })));
         Ok(())
     }
@@ -73,6 +74,7 @@ impl TestJayScreenshot {
             format: XRGB8888,
             modifier: ev.modifier,
             planes: self.planes.take(),
+            is_disjoint: Default::default(),
         })));
         Ok(())
     }

src/udmabuf.rs

@@ -162,6 +162,7 @@ impl Allocator for Udmabuf {
             format,
             modifier: LINEAR_MODIFIER,
             planes,
+            is_disjoint: Default::default(),
         };
         Ok(Rc::new(UdmabufBo {
             buf: dmabuf,

src/video/dmabuf.rs

@@ -5,7 +5,7 @@ use {
         video::{LINEAR_MODIFIER, Modifier},
     },
     arrayvec::ArrayVec,
-    std::{rc::Rc, sync::OnceLock},
+    std::{cell::OnceCell, rc::Rc, sync::OnceLock},
     uapi::{
         _IOW, _IOWR, OwnedFd,
         c::{self, dev_t, ioctl},
@@ -30,6 +30,7 @@ pub struct DmaBuf {
     pub format: &'static Format,
     pub modifier: Modifier,
     pub planes: PlaneVec<DmaBufPlane>,
+    pub is_disjoint: OnceCell<bool>,
 }
 
 pub const MAX_PLANES: usize = 4;
@@ -38,23 +39,25 @@ pub type PlaneVec<T> = ArrayVec<T, MAX_PLANES>;
 
 impl DmaBuf {
     pub fn is_disjoint(&self) -> bool {
-        if self.planes.len() <= 1 {
-            return false;
-        }
-        let stat = match uapi::fstat(self.planes[0].fd.raw()) {
-            Ok(s) => s,
-            _ => return true,
-        };
-        for plane in &self.planes[1..] {
-            let stat2 = match uapi::fstat(plane.fd.raw()) {
+        *self.is_disjoint.get_or_init(|| {
+            if self.planes.len() <= 1 {
+                return false;
+            }
+            let stat = match uapi::fstat(self.planes[0].fd.raw()) {
                 Ok(s) => s,
                 _ => return true,
             };
-            if stat2.st_ino != stat.st_ino {
-                return true;
+            for plane in &self.planes[1..] {
+                let stat2 = match uapi::fstat(plane.fd.raw()) {
+                    Ok(s) => s,
+                    _ => return true,
+                };
+                if stat2.st_ino != stat.st_ino {
+                    return true;
+                }
             }
-        }
-        false
+            false
+        })
     }
 
     pub fn udmabuf_size(&self) -> Option<usize> {

src/video/gbm.rs

@@ -202,6 +202,7 @@ unsafe fn export_bo(dmabuf_ids: &DmaBufIds, bo: *mut Bo) -> Result<DmaBuf, GbmEr
                 }
                 planes
             },
+            is_disjoint: Default::default(),
         })
     }
 }

src/wl_usr/usr_ifs/usr_jay_screencast.rs

@@ -155,6 +155,7 @@ impl JayScreencastEventHandler for UsrJayScreencast {
             format,
             modifier: ev.modifier,
             planes: mem::take(self.pending_planes.borrow_mut().deref_mut()),
+            is_disjoint: Default::default(),
         });
         Ok(())
     }