From 8d08912d223ffb3112107b58b7ff51e0aba56448 Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Thu, 12 May 2016 18:25:10 +0200
Subject: SCUMM HE: Implement 50/50 T14 blend mode

---
 engines/scumm/he/moonbase/moonbase.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/engines/scumm/he/moonbase/moonbase.cpp b/engines/scumm/he/moonbase/moonbase.cpp
index 414a1772fa..c07bd986d8 100644
--- a/engines/scumm/he/moonbase/moonbase.cpp
+++ b/engines/scumm/he/moonbase/moonbase.cpp
@@ -107,12 +107,16 @@ void Moonbase::blitT14WizImage(uint8 *dst, int dstw, int dsth, int dstPitch, con
 							WRITE_LE_UINT16(dst1, READ_LE_UINT16(src));
 						} else if (rawROP == 2) { // MMX_ADDITIVE
 							uint16 color = READ_LE_UINT16(src);
-							uint32 orig = READ_LE_UINT16(dst1);
+							uint16 orig = READ_LE_UINT16(dst1);
 
 							uint32 r = MIN<uint32>(0x7c00, (orig & 0x7c00) + (color & 0x7c00));
 							uint32 g = MIN<uint32>(0x03e0, (orig & 0x03e0) + (color & 0x03e0));
 							uint32 b = MIN<uint32>(0x001f, (orig & 0x001f) + (color & 0x001f));
 							WRITE_LE_UINT16(dst1, (r | g | b));
+						} else if (rawROP == 5) { // MMX_CHEAP_50_50
+							uint16 color = (READ_LE_UINT16(src) >> 1) & 0x3DEF;
+							uint16 orig = (READ_LE_UINT16(dst1) >> 1) & 0x3DEF;
+							WRITE_LE_UINT16(dst1, (color + orig));
 						}
 						dst1 += 2;
 					}
-- 
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