pub trait GdkContextExt {
fn create_from_window<W: IsA<Window>>(window: &W) -> Context;
unsafe fn draw_from_gl<W: IsA<Window>>(
&self,
window: &W,
source: i32,
source_type: i32,
buffer_scale: i32,
x: i32,
y: i32,
width: i32,
height: i32
);
fn clip_rectangle(&self) -> Option<Rectangle>;
fn set_source_rgba(&self, rgba: &RGBA);
fn set_source_pixbuf(&self, pixbuf: &Pixbuf, x: f64, y: f64);
fn set_source_window<W: IsA<Window>>(&self, window: &W, x: f64, y: f64);
fn rectangle(&self, rectangle: &Rectangle);
fn add_region(&self, region: &Region);
}