GRAPHICS/BASE: Adds definitions for scaler plugins

This includes a class for plugin implementations to inherit from and
code necessary for plugin managers to use scalers

base/plugins.cpp

@@ -39,6 +39,7 @@ int pluginTypeVersions[PLUGIN_TYPE_MAX] = {
 	PLUGIN_TYPE_ENGINE_VERSION,
 	PLUGIN_TYPE_MUSIC_VERSION,
 	PLUGIN_TYPE_DETECTION_VERSION,
+	PLUGIN_TYPE_SCALER_VERSION,
 };
 
 
@@ -942,3 +943,15 @@ DECLARE_SINGLETON(MusicManager);
 const PluginList &MusicManager::getPlugins() const {
 	return PluginManager::instance().getPlugins(PLUGIN_TYPE_MUSIC);
 }
+
+// Scaler plugins
+
+#include "graphics/scalerplugin.h"
+
+namespace Common {
+DECLARE_SINGLETON(ScalerManager);
+}
+
+const ScalerPlugin::List &ScalerManager::getPlugins() const {
+	return (const ScalerPlugin::List &)PluginManager::instance().getPlugins(PLUGIN_TYPE_SCALER);
+}

base/plugins.h

@@ -43,7 +43,7 @@ enum PluginType {
 	PLUGIN_TYPE_ENGINE,
 	PLUGIN_TYPE_MUSIC,
 	PLUGIN_TYPE_DETECTION,
-	/* PLUGIN_TYPE_SCALER, */	// TODO: Add graphics scaler plugins
+	PLUGIN_TYPE_SCALER,
 
 	PLUGIN_TYPE_MAX
 };
@@ -54,6 +54,7 @@ enum PluginType {
 #define PLUGIN_TYPE_ENGINE_VERSION 2
 #define PLUGIN_TYPE_MUSIC_VERSION 1
 #define PLUGIN_TYPE_DETECTION_VERSION 1
+#define PLUGIN_TYPE_SCALER_VERSION 1
 
 extern int pluginTypeVersions[PLUGIN_TYPE_MAX];
 

graphics/scalerplugin.h

@@ -0,0 +1,64 @@
+/* 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 GRAPHICS_SCALERPLUGIN_H
+#define GRAPHICS_SCALERPLUGIN_H
+
+#include "base/plugins.h"
+
+class ScalerPluginObject : public PluginObject {
+public:
+	virtual ~ScalerPluginObject() {}
+	virtual void scale(const uint8 *srcPtr, uint32 srcPitch,
+							uint8 *dstPtr, uint32 dstPitch, int width, int height) = 0;
+
+	virtual int getFactor() = 0;
+
+	/**
+	 * Increase the factor of scaling.
+	 * @return the new factor
+	 */
+	virtual int increaseFactor() = 0;
+
+	/**
+	 * Decrease the factor of scaling.
+	 * @return the new factor
+	 */
+	virtual int decreaseFactor() = 0;
+};
+
+typedef PluginSubclass<ScalerPluginObject> ScalerPlugin;
+
+/**
+ * Singleton class to manage scaler plugins
+ */
+class ScalerManager : public Common::Singleton<ScalerManager> {
+private:
+	friend class Common::Singleton<SingletonBaseType>;
+
+public:
+	const ScalerPlugin::List &getPlugins() const;
+};
+
+/** Convenience shortcut for accessing singleton */
+#define ScalerMan ScalerManager::instance()
+
+#endif