gdk: improve GLTextureBuilder build

Signed-off-by: Marc-André Lureau <[email protected]>

Author: elmarco

gdk4/src/gl_texture_builder.rs

@@ -5,7 +5,8 @@ use glib::{prelude::*, translate::*};
 
 impl GLTextureBuilder {
     #[doc(alias = "gdk_gl_texture_builder_build")]
-    pub unsafe fn build(&self) -> Texture {
+    #[must_use = "The builder must be built to be used"]
+    pub unsafe fn build(self) -> Texture {
         from_glib_full(ffi::gdk_gl_texture_builder_build(
             self.to_glib_none().0,
             None,
@@ -14,10 +15,8 @@ impl GLTextureBuilder {
     }
 
     #[doc(alias = "gdk_gl_texture_builder_build")]
-    pub unsafe fn build_with_release_func<F: FnOnce() + 'static>(
-        &self,
-        release_func: F,
-    ) -> Texture {
+    #[must_use = "The builder must be built to be used"]
+    pub unsafe fn build_with_release_func<F: FnOnce() + 'static>(self, release_func: F) -> Texture {
         unsafe extern "C" fn destroy_closure<F: FnOnce() + 'static>(func: glib::ffi::gpointer) {
             let released_func = Box::<F>::from_raw(func as *mut _);
             released_func();