Extract win32 HeadlessContext to a "headless" module

src/win32/headless.rs

@@ -0,0 +1,35 @@
+use super::Window;
+use super::init;
+
+use Api;
+use BuilderAttribs;
+use CreationError;
+
+///
+pub struct HeadlessContext(Window);
+
+impl HeadlessContext {
+    /// See the docs in the crate root file.
+    pub fn new(builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
+        let (builder, _) = builder.extract_non_static();
+        init::new_window(builder, None).map(|w| HeadlessContext(w))
+    }
+
+    /// See the docs in the crate root file.
+    pub unsafe fn make_current(&self) {
+        self.0.make_current()
+    }
+
+    /// See the docs in the crate root file.
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        self.0.get_proc_address(addr)
+    }
+
+    /// See the docs in the crate root file.
+    pub fn get_api(&self) -> Api {
+        Api::OpenGl
+    }
+
+    pub fn set_window_resize_callback(&mut self, _: Option<fn(u32, u32)>) {
+    }
+}