SDL: Clean up graphics manager switching slighty.

Sadly this also requires us to extend GraphicsManager for this SDL specific
feature. However, since that's only used in the SDL backend and Tizen it
should be fine for now...

1 files changed, 21 insertions, 0 deletions

diff --git a/backends/graphics/graphics.h b/backends/graphics/graphics.h
index 24397228e6..74258b8910 100644
--- a/backends/graphics/graphics.h
+++ b/backends/graphics/graphics.h
@@ -37,6 +37,27 @@ class GraphicsManager : public PaletteManager {
 public:
 	virtual ~GraphicsManager() {}
 
+	/**
+	 * Makes this graphics manager active. That means it should be ready to
+	 * process inputs now. However, even without being active it should be
+	 * able to query the supported modes and other bits.
+	 *
+	 * HACK: Actually this is specific to SdlGraphicsManager subclasses.
+	 * But sadly we cannot cast from GraphicsManager to SdlGraphicsManager
+	 * because there is no relation between these two.
+	 */
+	virtual void activateManager() {}
+
+	/**
+	 * Makes this graphics manager inactive. This should allow another
+	 * graphics manager to become active again.
+	 *
+	 * HACK: Actually this is specific to SdlGraphicsManager subclasses.
+	 * But sadly we cannot cast from GraphicsManager to SdlGraphicsManager
+	 * because there is no relation between these two.
+	 */
+	virtual void deactivateManager() {}
+
 	virtual bool hasFeature(OSystem::Feature f) = 0;
 	virtual void setFeatureState(OSystem::Feature f, bool enable) = 0;
 	virtual bool getFeatureState(OSystem::Feature f) = 0;