DREAMWEB: Add DreamBase as second base class for DreamGenContext

The idea is to slowly transfer converted methods into this new base class.
This transition then proves that the method does not access or modify
any of the emulation context.

for eaiser step-by-step  migration away from Context

3 files changed, 67 insertions, 17 deletions

diff --git a/engines/dreamweb/dreambase.h b/engines/dreamweb/dreambase.h
new file mode 100644
index 0000000000..db3c6d94c3
--- /dev/null
+++ b/engines/dreamweb/dreambase.h
@@ -0,0 +1,57 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef DREAMBASE_H
+#define DREAMBASE_H
+
+#include "common/scummsys.h"
+
+#include "dreamweb/runtime.h"
+
+namespace DreamWeb {
+	class DreamWebEngine;
+}
+
+
+namespace DreamGen {
+
+class DreamBase {
+public:
+	enum { kDefaultDataSegment = 0x1000 };
+
+	DreamWeb::DreamWebEngine *engine;
+
+	SegmentPtr _realData;	///< the primary data segment, points to a huge blob of binary data
+	SegmentRef data;	///< fake segment register always pointing to data segment
+
+	DreamBase() : _realData(new Segment()), data(kDefaultDataSegment, _realData) {
+	}
+
+
+public:
+// TODO: Move functions from stubs.h which do not access any Context member variables to here.
+};
+
+
+} // End of namespace DreamGen
+
+#endif
diff --git a/engines/dreamweb/dreamgen.h b/engines/dreamweb/dreamgen.h
index 9b5a798782..33a362f449 100644
--- a/engines/dreamweb/dreamgen.h
+++ b/engines/dreamweb/dreamgen.h
@@ -27,12 +27,15 @@
 
 #include "dreamweb/runtime.h"
 
-#include "structs.h"
+#include "dreamweb/structs.h"
+#include "dreamweb/dreambase.h"
 
 namespace DreamGen {
 
-class DreamGenContext : public Context {
+class DreamGenContext : public DreamBase, public Context {
 public:
+	DreamGenContext() : DreamBase(), Context(_realData) {}
+
 	void __start();
 #include "stubs.h" // Allow hand-reversed functions to have a signature different than void f()
 
diff --git a/engines/dreamweb/runtime.h b/engines/dreamweb/runtime.h
index 2a23c3ec8d..48f7c88a20 100644
--- a/engines/dreamweb/runtime.h
+++ b/engines/dreamweb/runtime.h
@@ -31,10 +31,6 @@
 #include "common/list.h"
 #include "common/ptr.h"
 
-namespace DreamWeb {
-	class DreamWebEngine;
-}
-
 namespace DreamGen {
 
 struct Register {
@@ -242,8 +238,6 @@ class Context {
 	FreeSegmentList _freeSegments;
 
 public:
-	DreamWeb::DreamWebEngine *engine;
-
 	enum { kDefaultDataSegment = 0x1000 };
 
 	Register ax, dx, bx, cx, si, di;
@@ -256,21 +250,17 @@ public:
 	LowPartOfRegister	dl;
 	HighPartOfRegister	dh;
 
-	SegmentPtr _realData;	///< the primary data segment, points to a huge blob of binary data
 	SegmentRef cs;
 	MutableSegmentRef ds;
 	MutableSegmentRef es;
-	SegmentRef data;	///< fake segment register always pointing to data segment
 	Flags flags;
 
-	inline Context(): engine(0), al(ax), ah(ax), bl(bx), bh(bx), cl(cx), ch(cx), dl(dx), dh(dx),
-		_realData(new Segment()),
-		cs(kDefaultDataSegment, _realData),
-		ds(this, kDefaultDataSegment, _realData),
-		es(this, kDefaultDataSegment, _realData),
-		data(kDefaultDataSegment, _realData) {
+	Context(SegmentPtr realData): al(ax), ah(ax), bl(bx), bh(bx), cl(cx), ch(cx), dl(dx), dh(dx),
+		cs(kDefaultDataSegment, realData),
+		ds(this, kDefaultDataSegment, realData),
+		es(this, kDefaultDataSegment, realData) {
 
-		_segments[kDefaultDataSegment] = _realData;
+		_segments[kDefaultDataSegment] = realData;
 	}
 
 	SegmentRef getSegment(uint16 value) {