EmulatorPkg/EmuGopDxe: Clear screen to black in GOP.SetMode

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1118

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Cc: Andrew Fish <afish@apple.com>
diff --git a/EmulatorPkg/EmuGopDxe/GopScreen.c b/EmulatorPkg/EmuGopDxe/GopScreen.c
index 761d945..b6d1b6c 100644
--- a/EmulatorPkg/EmuGopDxe/GopScreen.c
+++ b/EmulatorPkg/EmuGopDxe/GopScreen.c
@@ -1,6 +1,6 @@
 /*++ @file

 

-Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>

 Portions copyright (c) 2010 - 2011, Apple Inc. All rights reserved.

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

@@ -146,9 +146,9 @@
                             );

 

 

-  Fill.Red                      = 0x7f;

-  Fill.Green                    = 0x7F;

-  Fill.Blue                     = 0x7f;

+  Fill.Red   = 0;

+  Fill.Green = 0;

+  Fill.Blue  = 0;

   This->Blt (

           This,

           &Fill,