Add ScreenGraphics to get a "Graphics" to draw directly onto the screen.

src/gui/graphics.cpp

@@ -124,3 +124,16 @@ gfx::Size Graphics::measureString(const std::string& str)
   return gfx::Size(ji_font_text_len(m_currentFont, str.c_str()),
 		   text_height(m_currentFont));
 }
+
+//////////////////////////////////////////////////////////////////////
+// ScreenGraphics
+
+ScreenGraphics::ScreenGraphics()
+  : Graphics(screen, 0, 0)
+{
+  setFont(font);		// Allegro default font
+}
+
+ScreenGraphics::~ScreenGraphics()
+{
+}

src/gui/graphics.h

@@ -55,6 +55,14 @@ private:
   FONT* m_currentFont;
 };
 
+// Class to draw directly in the screen.
+class ScreenGraphics : public Graphics
+{
+public:
+  ScreenGraphics();
+  virtual ~ScreenGraphics();
+};
+
 // Class to temporary set the Graphics' clip region to a sub-rectangle
 // (in the life-time of the IntersectClip instance).
 class IntersectClip