BACKENDS: Add getDefaultScaler and getDefaultScaleFactor to OSystem

backends/base-backend.cpp

@@ -40,6 +40,9 @@ bool BaseBackend::setScaler(const char *name, int factor) {
 	if (!name)
 		return false;
 
+	if (!scumm_stricmp(name, "default"))
+		return setScaler(getDefaultScaler(), factor);
+
 	const PluginList &scalerPlugins = ScalerMan.getPlugins();
 
 	for (uint scalerIndex = 0; scalerIndex < scalerPlugins.size(); scalerIndex++) {

backends/graphics/graphics.h

@@ -63,6 +63,8 @@ public:
 	virtual int getDefaultStretchMode() const { return 0; }
 	virtual bool setStretchMode(int mode) { return false; }
 	virtual int getStretchMode() const { return 0; }
+	virtual uint getDefaultScaler() const { return 0; }
+	virtual int getDefaultScaleFactor() const { return 1; }
 	virtual bool setScaler(uint mode, int factor) { return false; }
 	virtual uint getScaler() const { return 0; }
 

backends/graphics/surfacesdl/surfacesdl-graphics.cpp

@@ -160,12 +160,8 @@ SurfaceSdlGraphicsManager::SurfaceSdlGraphicsManager(SdlEventSource *sdlEventSou
 	_videoMode.stretchMode = STRETCH_FIT;
 #endif
 
-	_videoMode.scalerIndex = 0;
-#ifdef USE_SCALERS
-	_videoMode.scaleFactor = 2;
-#else
-	_videoMode.scaleFactor = 1;
-#endif
+	_videoMode.scalerIndex = getDefaultScaler();
+	_videoMode.scaleFactor = getDefaultScaleFactor();
 }
 
 SurfaceSdlGraphicsManager::~SurfaceSdlGraphicsManager() {
@@ -557,6 +553,18 @@ int SurfaceSdlGraphicsManager::getGraphicsModeScale(int mode) const {
 	return _videoMode.scaleFactor;
 }
 
+uint SurfaceSdlGraphicsManager::getDefaultScaler() const {
+	return ScalerMan.findScalerPluginIndex("normal");
+}
+
+int SurfaceSdlGraphicsManager::getDefaultScaleFactor() const {
+#ifdef USE_SCALERS
+	return 2;
+#else
+	return 1;
+#endif
+}
+
 bool SurfaceSdlGraphicsManager::setScaler(uint mode, int factor) {
 	Common::StackLock lock(_graphicsMutex);
 
@@ -566,7 +574,9 @@ bool SurfaceSdlGraphicsManager::setScaler(uint mode, int factor) {
 		return true;
 
 	int newFactor;
-	if (_scalerPlugins[mode]->get<ScalerPluginObject>().hasFactor(factor))
+	if (factor == -1)
+		newFactor = getDefaultScaleFactor();
+	else if (_scalerPlugins[mode]->get<ScalerPluginObject>().hasFactor(factor))
 		newFactor = factor;
 	else if (_scalerPlugins[mode]->get<ScalerPluginObject>().hasFactor(_oldVideoMode.scaleFactor))
 		newFactor = _oldVideoMode.scaleFactor;

backends/graphics/surfacesdl/surfacesdl-graphics.h

@@ -73,6 +73,8 @@ public:
 	virtual int getDefaultGraphicsMode() const override;
 	virtual bool setGraphicsMode(int mode, uint flags = OSystem::kGfxModeNoFlags) override;
 	virtual int getGraphicsMode() const override;
+	virtual uint getDefaultScaler() const override;
+	virtual int getDefaultScaleFactor() const override;
 	virtual bool setScaler(uint mode, int factor) override;
 	virtual uint getScaler() const override;
 #ifdef USE_RGB_COLOR

backends/modular-backend.cpp

@@ -108,6 +108,14 @@ int ModularGraphicsBackend::getStretchMode() const {
 	return _graphicsManager->getStretchMode();
 }
 
+uint ModularGraphicsBackend::getDefaultScaler() const {
+	return _graphicsManager->getDefaultScaler();
+}
+
+int ModularGraphicsBackend::getDefaultScaleFactor() const {
+	return _graphicsManager->getDefaultScaleFactor();
+}
+
 bool ModularGraphicsBackend::setScaler(uint mode, int factor) {
 	return _graphicsManager->setScaler(mode, factor);
 }

backends/modular-backend.h

@@ -76,6 +76,8 @@ public:
 	virtual int getDefaultStretchMode() const override final;
 	virtual bool setStretchMode(int mode) override final;
 	virtual int getStretchMode() const override final;
+	virtual uint getDefaultScaler() const override final;
+	virtual int getDefaultScaleFactor() const override final;
 	virtual bool setScaler(uint mode, int factor) override final;
 	virtual uint getScaler() const override final;
 #ifdef USE_RGB_COLOR

base/plugins.cpp

@@ -1023,3 +1023,17 @@ Plugin *ScalerManager::findScalerPlugin(const char *name) const {
 
 	return 0;
 }
+
+uint ScalerManager::findScalerPluginIndex(const char *name) const {
+	const PluginList &plugins = getPlugins();
+	uint index = 0;
+
+	for (PluginList::const_iterator i = plugins.begin(); i != plugins.end(); ++i) {
+		if (!strcmp((*i)->get<ScalerPluginObject>().getName(), name)) {
+			return index;
+		}
+		index++;
+	}
+
+	return 0;
+}

common/system.h

@@ -866,6 +866,28 @@ public:
 	 */
 	virtual int getStretchMode() const { return 0; }
 
+	/**
+	 * Return the ID of the 'default' scaler.
+	 *
+	 * This mode is set by the client code when no user overrides
+	 * are present (i.e. if no custom scaler is selected using the
+	 * command line or a config file).
+	 *
+	 * @return ID of the 'default' scaler.
+	 */
+	virtual uint getDefaultScaler() const { return 0; }
+
+	/**
+	 * Return the 'default' scale factor.
+	 *
+	 * This mode is set by the client code when no user overrides
+	 * are present (i.e. if no custom shader mode is selected using
+	 * the command line or a config file).
+	 *
+	 * @return The 'default' scale factor.
+	 */
+	virtual int getDefaultScaleFactor() const { return 1; }
+
 	/**
 	 * Switch to the specified scaler.
 	 *

graphics/scalerplugin.h

@@ -225,6 +225,11 @@ public:
 	 * Search the scaler plugins for a special plugin based on its name.
 	 */
 	Plugin *findScalerPlugin(const char *name) const;
+
+	/**
+	 * Search the scaler plugins for a special plugin based on its name.
+	 */
+	uint findScalerPluginIndex(const char *name) const;
 };
 
 /** Convenience shortcut for accessing singleton */