From e95470d189cbe5877053b128c89a4aac6c973d54 Mon Sep 17 00:00:00 2001
From: Bendegúz Nagy
Date: Fri, 1 Jul 2016 22:04:55 +0200
Subject: DM: Fix errors in DisplayMan::isDerivedBitmapInCache

---
 engines/dm/gfx.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/engines/dm/gfx.cpp b/engines/dm/gfx.cpp
index 49f0d2e4d3..d8bf60eb58 100644
--- a/engines/dm/gfx.cpp
+++ b/engines/dm/gfx.cpp
@@ -2894,8 +2894,9 @@ uint16 DisplayMan::getHorizontalOffsetM22(uint16 val) {
 }
 
 bool DisplayMan::isDerivedBitmapInCache(int16 derivedBitmapIndex) {
-	if (_derivedBitmaps == nullptr) {
-		_derivedBitmaps[derivedBitmapIndex] = new byte[_derivedBitmapByteCount[derivedBitmapIndex]];
+	if (_derivedBitmaps[derivedBitmapIndex] == nullptr) {
+		// * 2, because the original uses 4 bits instead of 8 bits to store a pixel
+		_derivedBitmaps[derivedBitmapIndex] = new byte[_derivedBitmapByteCount[derivedBitmapIndex] * 2];
 		return false;
 	} else
 		return true;
-- 
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