Moved default implementations for various OSystem methods into a new class BaseBackend

svn-id: r36135

1 files changed, 80 insertions, 0 deletions

diff --git a/backends/base-backend.cpp b/backends/base-backend.cpp
new file mode 100644
index 0000000000..4c4b78b6cb
--- /dev/null
+++ b/backends/base-backend.cpp
@@ -0,0 +1,80 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "backends/base-backend.h"
+#include "backends/events/default/default-events.h"
+#include "gui/message.h"
+
+void BaseBackend::displayMessageOnOSD(const char *msg) {
+	// Display the message for 1.5 seconds
+	GUI::TimedMessageDialog dialog(msg, 1500);
+	dialog.runModal();
+}
+
+
+static Common::EventManager *s_eventManager = 0;
+
+Common::EventManager *BaseBackend::getEventManager() {
+	// FIXME/TODO: Eventually this method should be turned into an abstract one,
+	// to force backends to implement this conciously (even if they
+	// end up returning the default event manager anyway).
+	if (!s_eventManager)
+		s_eventManager = new DefaultEventManager(this);
+	return s_eventManager;
+}
+
+void BaseBackend::clearScreen() {
+	Graphics::Surface *screen = lockScreen();
+	if (screen && screen->pixels)
+		memset(screen->pixels, 0, screen->h * screen->pitch);
+	unlockScreen();
+}
+
+
+/*
+ FIXME: Maybe we should push the default config file loading/saving code below
+ out to all the backends?
+*/
+
+
+#if defined(UNIX)
+#define DEFAULT_CONFIG_FILE ".scummvmrc"
+#else
+#define DEFAULT_CONFIG_FILE "scummvm.ini"
+#endif
+
+Common::SeekableReadStream *BaseBackend::createConfigReadStream() {
+	Common::FSNode file(DEFAULT_CONFIG_FILE);
+	return file.createReadStream();
+}
+
+Common::WriteStream *BaseBackend::createConfigWriteStream() {
+#ifdef __DC__
+	return 0;
+#else
+	Common::FSNode file(DEFAULT_CONFIG_FILE);
+	return file.createWriteStream();
+#endif
+}