Add failure if SwapBuffers returns an error

1 files changed, 4 insertions, 1 deletions

diff --git a/src/win32/mod.rs b/src/win32/mod.rs
index da94c70..e3920a8 100644
--- a/src/win32/mod.rs
+++ b/src/win32/mod.rs
@@ -191,7 +191,10 @@ impl Window {
     /// See the docs if the crate root file.
     pub fn swap_buffers(&self) {
         unsafe {
-            ffi::SwapBuffers(self.hdc);
+            if ffi::SwapBuffers(self.hdc) == 0 {
+                use std::os;
+                fail!("{}", os::error_string(os::errno()));
+            }
         }
     }
 }