From bbaa129842d38d3182771da1d4baf399304a4f5f Mon Sep 17 00:00:00 2001
From: Felix Kaaman <trundmatu@gmail.com>
Date: Tue, 16 Jun 2015 11:29:17 +0200
Subject: Add transparency support for cocoa. Closes #472

---
 src/api/cocoa/mod.rs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'src/api/cocoa/mod.rs')

diff --git a/src/api/cocoa/mod.rs b/src/api/cocoa/mod.rs
index ba5710d..d080d06 100644
--- a/src/api/cocoa/mod.rs
+++ b/src/api/cocoa/mod.rs
@@ -357,6 +357,21 @@ impl Window {
         };
 
         unsafe {
+            if builder.transparent {
+                let clear_col = {
+                    let cls = Class::get("NSColor").unwrap();
+
+                    msg_send![cls, clearColor]
+                };
+                window.setOpaque_(NO);
+                window.setBackgroundColor_(clear_col);
+
+                let obj = context.CGLContextObj();
+
+                let mut opacity = 0;
+                CGLSetParameter(obj, kCGLCPSurfaceOpacity, &mut opacity);
+            }
+            
             app.activateIgnoringOtherApps_(YES);
             if builder.visible {
                 window.makeKeyAndOrderFront_(nil);
@@ -437,7 +452,7 @@ impl Window {
                 }
             };
 
-            let masks = if screen.is_some() {
+            let masks = if screen.is_some() || !builder.decorations {
                 NSBorderlessWindowMask as NSUInteger
             } else {
                 NSTitledWindowMask as NSUInteger |
-- 
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