Extract headless context from api/win32 to platform/windows

src/platform/windows/mod.rs

@@ -1,3 +1,33 @@
 #![cfg(target_os = "windows")]
 
 pub use api::win32::*;
+
+use Api;
+use BuilderAttribs;
+use CreationError;
+
+///
+pub struct HeadlessContext(Window);
+
+impl HeadlessContext {
+    pub fn new(mut builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
+        builder.visible = false;
+        Window::new(builder).map(|w| HeadlessContext(w))
+    }
+
+    pub unsafe fn make_current(&self) {
+        self.0.make_current()
+    }
+
+    pub fn is_current(&self) -> bool {
+        self.0.is_current()
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        self.0.get_proc_address(addr)
+    }
+
+    pub fn get_api(&self) -> Api {
+        self.0.get_api()
+    }
+}