gdk: Use RawFd for DmabufTextureBuilder fd setter and mark function unsafe

The fd must be valid for as long as the texture stays around, which
can't be statically guaranteed and is job of the user, e.g. by using the
release function.

And use Borrowed fd for getter.

Author: sdroege

gdk4/Gir.toml

@@ -453,6 +453,10 @@ status = "generate"
     # Take by value and return self
     manual = true
     [[object.function]]
+    pattern = "get_fd"
+    # Use BorrowedFd
+    manual = true
+    [[object.function]]
     name = "build"
     manual = true # Can't be auto-generated
     [[object.property]]

gdk4/src/auto/dmabuf_texture_builder.rs

@@ -47,12 +47,6 @@ impl DmabufTextureBuilder {
         }
     }
 
-    #[doc(alias = "gdk_dmabuf_texture_builder_get_fd")]
-    #[doc(alias = "get_fd")]
-    pub fn fd(&self, plane: u32) -> i32 {
-        unsafe { ffi::gdk_dmabuf_texture_builder_get_fd(self.to_glib_none().0, plane) }
-    }
-
     #[doc(alias = "gdk_dmabuf_texture_builder_get_fourcc")]
     #[doc(alias = "get_fourcc")]
     pub fn fourcc(&self) -> u32 {

gdk4/src/dmabuf_texture_builder.rs

@@ -35,15 +35,34 @@ impl DmabufTextureBuilder {
         self
     }
 
+    // rustdoc-stripper-ignore-next
+    /// # Safety
+    ///
+    /// The caller must ensure that `fd` says valid for at least as long as the texture, e.g. by
+    /// using `build_with_release_func()` to get notified when `fd` is not used anymore.
     #[doc(alias = "gdk_dmabuf_texture_builder_set_fd")]
-    pub fn set_fd(self, plane: u32, fd: i32) -> Self {
+    pub unsafe fn set_fd(self, plane: u32, fd: std::os::fd::RawFd) -> Self {
         unsafe {
             ffi::gdk_dmabuf_texture_builder_set_fd(self.to_glib_none().0, plane, fd);
         }
 
         self
     }
 
+    #[doc(alias = "gdk_dmabuf_texture_builder_get_fd")]
+    #[doc(alias = "get_fd")]
+    pub fn fd(&self, plane: u32) -> Option<std::os::fd::BorrowedFd<'_>> {
+        unsafe {
+            let fd = ffi::gdk_dmabuf_texture_builder_get_fd(self.to_glib_none().0, plane);
+
+            if fd == -1 {
+                None
+            } else {
+                Some(std::os::fd::BorrowedFd::borrow_raw(fd))
+            }
+        }
+    }
+
     #[doc(alias = "gdk_dmabuf_texture_builder_set_fourcc")]
     #[doc(alias = "fourcc")]
     pub fn set_fourcc(self, fourcc: u32) -> Self {