odilia-app/atspi-rs

Gnome's at-spi (Assistive Technology Service Provider Interface) bindings for Rust.

atspi-rs's Issues

How to get the inner AtspiRect in Rect?

In components.rs:

atspi-rs/src/auto/component.rs

Lines 103 to 109 in 83c96bc

	fn extents(&self, ctype: CoordType) -> Result<Rect, glib::Error> {
	unsafe {
	let mut error = ptr::null_mut();
	let ret = ffi::atspi_component_get_extents(self.as_ref().to_glib_none().0, ctype.into_glib(), &mut error);
	if error.is_null() { Ok(from_glib_full(ret)) } else { Err(from_glib_full(error)) }
	}
	}

ret has type AtspiRect, which is defined in sys/lib.rs:

atspi-rs/sys/src/lib.rs

Lines 669 to 674 in 83c96bc

	pub struct AtspiRect {
	pub x: c_int,
	pub y: c_int,
	pub width: c_int,
	pub height: c_int,
	}

I want to get the fields and they're public, which is good. But ret is wrapped into type Rect, which is returned instead. Rect is defined in rect.rs:

atspi-rs/src/auto/rect.rs

Lines 7 to 16 in 83c96bc

	glib::wrapper! {
	#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
	pub struct Rect(Boxed<ffi::AtspiRect>);
	match fn {
	copy => |ptr| glib::gobject_ffi::g_boxed_copy(ffi::atspi_rect_get_type(), ptr as *mut _) as *mut ffi::AtspiRect,
	free => |ptr| glib::gobject_ffi::g_boxed_free(ffi::atspi_rect_get_type(), ptr as *mut _),
	type_ => || ffi::atspi_rect_get_type(),
	}
	}

The only field is private, and there are no methods to interact with the inner AtspiRect, according to https://gtk-rs.org/gtk-rs-core/stable/latest/docs/glib/macro.wrapper.html. cargo expand also shows that the copy method takes *const ffi::AtspiRect (but how do I get it?), and it is private anyway.

If the extents method directly returned ret, I could dereference it and then get the fields. Dereferencing a raw pointer is unsafe, because IIRC gtk is ref-counted so there is definitely a potential for memory safety issues. But how I am supposed to work with Rect, which seems to be a completely opaque type?