From fa1d62ffbf509a4231a58488a53676c7c2a0558e Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sun, 9 Nov 2014 15:23:34 +0200
Subject: [PATCH] Fixed random junk that may appear in transparency (alpha)
 channel of mouse cursor image

---
 src/cocoa/i_backend_cocoa.mm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cocoa/i_backend_cocoa.mm b/src/cocoa/i_backend_cocoa.mm
index 859fcc495..e2bd70374 100644
--- a/src/cocoa/i_backend_cocoa.mm
+++ b/src/cocoa/i_backend_cocoa.mm
@@ -1539,6 +1539,8 @@ bool I_SetCursor(FTexture* cursorpic)
 		// Load bitmap data to representation
 		
 		BYTE* buffer = [bitmapImageRep bitmapData];
+		memset(buffer, 0, imagePitch * imageHeight);
+
 		FBitmap bitmap(buffer, imagePitch, imageWidth, imageHeight);
 		cursorpic->CopyTrueColorPixels(&bitmap, 0, 0);