gstreamer/plugin_feature: Make load downcast to Self

The loaded plugin feature is always of the same type as the unloaded
one. Move `fn load` to PluginFeatureExtManual to implement this.

gstreamer/Gir.toml

@@ -1240,8 +1240,7 @@ manual_traits = ["PluginFeatureExtManual"]
 
     [[object.function]]
     name = "load"
-        [object.function.return]
+    manual = true
-        nullable_return_is_error = "Failed to load plugin feature"
 
 [[object]]
 name = "Gst.Registry"

gstreamer/src/auto/plugin_feature.rs

@@ -29,9 +29,6 @@ pub trait PluginFeatureExt: 'static {
 
     #[doc(alias = "gst_plugin_feature_get_plugin_name")]
     fn get_plugin_name(&self) -> Option<glib::GString>;
-
-    #[doc(alias = "gst_plugin_feature_load")]
-    fn load(&self) -> Result<PluginFeature, glib::BoolError>;
 }
 
 impl<O: IsA<PluginFeature>> PluginFeatureExt for O {
@@ -61,13 +58,4 @@ impl<O: IsA<PluginFeature>> PluginFeatureExt for O {
             ))
         }
     }
-
-    fn load(&self) -> Result<PluginFeature, glib::BoolError> {
-        unsafe {
-            Option::<_>::from_glib_full(ffi::gst_plugin_feature_load(
-                self.as_ref().to_glib_none().0,
-            ))
-            .ok_or_else(|| glib::bool_error!("Failed to load plugin feature"))
-        }
-    }
 }

gstreamer/src/auto/versions.txt

@@ -1,2 +1,2 @@
-Generated by gir (https://github.com/gtk-rs/gir @ 1c7b41a)
+Generated by gir (https://github.com/gtk-rs/gir @ d8408d8)
-from gir-files (https://github.com/gtk-rs/gir-files @ 3c0281db)
+from gir-files (https://github.com/gtk-rs/gir-files @ 5f5218e1)

gstreamer/src/plugin_feature.rs

@@ -3,12 +3,13 @@
 use crate::PluginFeature;
 use crate::Rank;
 
-use glib::object::IsA;
+use glib::object::{Cast, IsA};
-use glib::translate::{from_glib, ToGlib, ToGlibPtr};
+use glib::translate::{from_glib, FromGlibPtrFull, ToGlib, ToGlibPtr};
 
-pub trait PluginFeatureExtManual: 'static {
+pub trait PluginFeatureExtManual: Sized + 'static {
     fn get_rank(&self) -> Rank;
     fn set_rank(&self, rank: Rank);
+    fn load(&self) -> Result<Self, glib::BoolError>;
 }
 
 impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {
@@ -24,4 +25,30 @@ impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {
             ffi::gst_plugin_feature_set_rank(self.as_ref().to_glib_none().0, rank.to_glib() as u32);
         }
     }
+
+    fn load(&self) -> Result<Self, glib::BoolError> {
+        unsafe {
+            let loaded = Option::<PluginFeature>::from_glib_full(ffi::gst_plugin_feature_load(
+                self.as_ref().to_glib_none().0,
+            ))
+            .ok_or_else(|| glib::bool_error!("Failed to load plugin feature"))?;
+            Ok(loaded.unsafe_cast())
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::prelude::*;
+
+    #[test]
+    fn test_load() {
+        crate::init().unwrap();
+
+        let factory = crate::ElementFactory::find("identity").unwrap();
+        let loaded = factory.load().unwrap();
+        assert_eq!(factory.get_type(), loaded.get_type());
+        let _element = loaded.create(None).unwrap();
+    }
 }

gstreamer/sys/build.rs

@@ -1,5 +1,5 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 1c7b41a)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ d8408d8)
-// from gir-files (https://github.com/gtk-rs/gir-files @ 3c0281db)
+// from gir-files (https://github.com/gtk-rs/gir-files @ 5f5218e1)
 // DO NOT EDIT
 
 #[cfg(not(feature = "dox"))]

gstreamer/sys/src/lib.rs

@@ -1,5 +1,5 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 1c7b41a)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ d8408d8)
-// from gir-files (https://github.com/gtk-rs/gir-files @ 3c0281db)
+// from gir-files (https://github.com/gtk-rs/gir-files @ 5f5218e1)
 // DO NOT EDIT
 
 #![allow(non_camel_case_types, non_upper_case_globals, non_snake_case)]

gstreamer/sys/tests/abi.rs

@@ -1,5 +1,5 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 1c7b41a)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ d8408d8)
-// from gir-files (https://github.com/gtk-rs/gir-files @ 3c0281db)
+// from gir-files (https://github.com/gtk-rs/gir-files @ 5f5218e1)
 // DO NOT EDIT
 
 use gstreamer_sys::*;

gstreamer/sys/tests/constant.c

@@ -1,5 +1,5 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 1c7b41a)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ d8408d8)
-// from gir-files (https://github.com/gtk-rs/gir-files @ 3c0281db)
+// from gir-files (https://github.com/gtk-rs/gir-files @ 5f5218e1)
 // DO NOT EDIT
 
 #include "manual.h"

gstreamer/sys/tests/layout.c

@@ -1,5 +1,5 @@
-// This file was generated by gir (https://github.com/gtk-rs/gir @ 1c7b41a)
+// This file was generated by gir (https://github.com/gtk-rs/gir @ d8408d8)
-// from gir-files (https://github.com/gtk-rs/gir-files @ 3c0281db)
+// from gir-files (https://github.com/gtk-rs/gir-files @ 5f5218e1)
 // DO NOT EDIT
 
 #include "manual.h"