(svn r14080) -Fix (r14052): assert triggered when drawing chat window with 32bpp-anim blitter (backup buffer was too small)

src/blitter/base.hpp

@@ -183,10 +183,15 @@ public:
 	virtual Blitter::PaletteAnimation UsePaletteAnimation() = 0;
 
 	/**
-	 * Get the naem of the blitter, the same as the Factory-instance returns.
+	 * Get the name of the blitter, the same as the Factory-instance returns.
 	 */
 	virtual const char *GetName() = 0;
 
+	/**
+	 * Get how many bytes are needed to store a pixel.
+	 */
+	virtual int GetBytesPerPixel() = 0;
+
 	virtual ~Blitter() { }
 };