(svn r10132) -Codechange: split out the last direct video-buffer read access to the blitter-layer

-Add: added a new renderer and blitter to make room for some optimized bpp
-Fix: fill the alpha channel in the grf-spriteloader

src/blitter/8bpp_simple.hpp

@@ -13,6 +13,8 @@ public:
 
 	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
 
+	/* virtual */ void DrawColorMappingRect(void *dst, int width, int height, int pal);
+
 	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
 
 	/* virtual */ const char *GetRenderer() { return "8bpp"; }