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// Take a look at the license at the top of the repository in the LICENSE file.

use crate::Surface;
use glib::object::IsA;
use glib::translate::*;

pub trait SurfaceExtManual: 'static {
    /// Create a new Cairo surface that is as compatible as possible with the
    /// given `self`.
    ///
    /// For example the new surface will have the same fallback resolution
    /// and font options as `self`. Generally, the new surface will also
    /// use the same backend as `self`, unless that is not possible for
    /// some reason. The type of the returned surface may be examined with
    /// `cairo_surface_get_type()`.
    ///
    /// Initially the surface contents are all 0 (transparent if contents
    /// have transparency, black otherwise.)
    ///
    /// This function always returns a valid pointer, but it will return a
    /// pointer to a “nil” surface if `other` is already in an error state
    /// or any other error occurs.
    /// ## `content`
    /// the content for the new surface
    /// ## `width`
    /// width of the new surface
    /// ## `height`
    /// height of the new surface
    ///
    /// # Returns
    ///
    /// a pointer to the newly allocated surface. The caller
    ///  owns the surface and should call `cairo_surface_destroy()` when done
    ///  with it.
    #[doc(alias = "gdk_surface_create_similar_surface")]
    fn create_similar_surface(
        &self,
        content: cairo::Content,
        width: i32,
        height: i32,
    ) -> Option<cairo::Surface>;

    /// Translates coordinates between two surfaces.
    ///
    /// Note that this only works if `to` and `self` are popups or
    /// transient-for to the same toplevel (directly or indirectly).
    /// ## `to`
    /// the target surface
    /// ## `x`
    /// coordinates to translate
    /// ## `y`
    /// coordinates to translate
    ///
    /// # Returns
    ///
    /// [`true`] if the coordinates were successfully translated
    #[doc(alias = "gdk_surface_translate_coordinates")]
    fn translate_coordinates(&self, to: &Surface, x: f64, y: f64) -> bool;
}

impl<O: IsA<Surface>> SurfaceExtManual for O {
    fn create_similar_surface(
        &self,
        content: cairo::Content,
        width: i32,
        height: i32,
    ) -> Option<cairo::Surface> {
        unsafe {
            from_glib_full(ffi::gdk_surface_create_similar_surface(
                self.as_ref().to_glib_none().0,
                content.into(),
                width,
                height,
            ))
        }
    }

    fn translate_coordinates(&self, to: &Surface, mut x: f64, mut y: f64) -> bool {
        unsafe {
            from_glib(ffi::gdk_surface_translate_coordinates(
                self.as_ref().to_glib_none().0,
                to.to_glib_none().0,
                &mut x,
                &mut y,
            ))
        }
    }
}