SM_SDL_OrderedDither -> RageSurfaceUtils::OrderedDither

SM_SDL_ErrorDiffusionDither -> RageSurfaceUtils::ErrorDiffusionDither
(these have nothing to do with SDL; I'd rename the files but I hate
losing CVS history)

stepmania/src/BannerCache.cpp

@@ -383,9 +383,9 @@ void BannerCache::CacheBannerInternal( CString BannerPath )
 		RageSurface *dst = CreateSurface( img->w, img->h, 16,
 			0x7C00, 0x03E0, 0x001F, 0x8000 );
 
-		/* SM_SDL_OrderedDither is still faster than SM_SDL_ErrorDiffusionDither, and
+		/* OrderedDither is still faster than ErrorDiffusionDither, and
 		 * these images are very small and only displayed briefly. */
-		SM_SDL_OrderedDither(img, dst);
+		RageSurfaceUtils::OrderedDither( img, dst );
 		delete img;
 		img = dst;
 	}

stepmania/src/RageBitmapTexture.cpp

@@ -233,7 +233,7 @@ void RageBitmapTexture::Create()
 		RageSurface *dst = CreateSurface( img->w, img->h, pfd->bpp,
 			pfd->masks[0], pfd->masks[1], pfd->masks[2], pfd->masks[3] );
 
-		SM_SDL_ErrorDiffusionDither(img, dst);
+		RageSurfaceUtils::ErrorDiffusionDither( img, dst );
 		delete img;
 		img = dst;
 	}

stepmania/src/SDL_dither.cpp

@@ -52,7 +52,7 @@ static uint8_t DitherPixel(int x, int y, int intensity,  int conv)
 	return uint8_t((out_intensity + 1) >> 16);
 }
 
-void SM_SDL_OrderedDither(const RageSurface *src, RageSurface *dst)
+void RageSurfaceUtils::OrderedDither( const RageSurface *src, RageSurface *dst )
 {
 	static bool DitherMatCalc_initted = false;
 	if( !DitherMatCalc_initted )
@@ -167,7 +167,7 @@ void SM_SDL_OrderedDither(const RageSurface *src, RageSurface *dst)
 /* This is very similar to SM_SDL_OrderedDither, except instead of using a matrix
  * containing rounding values, we truncate and then add the resulting error for
  * each pixel to the next pixel on the same line.  (Maybe we could do both?) */
-void SM_SDL_ErrorDiffusionDither(const RageSurface *src, RageSurface *dst)
+void RageSurfaceUtils::ErrorDiffusionDither( const RageSurface *src, RageSurface *dst )
 {
 	/* We can't dither to paletted surfaces. */
 	ASSERT( dst->format->BytesPerPixel > 1 );

stepmania/src/SDL_dither.h

@@ -2,8 +2,11 @@
 #define SM_SDL_DITHER_H
 
 struct RageSurface;
-void SM_SDL_OrderedDither(const RageSurface *src, RageSurface *dst);
-void SM_SDL_ErrorDiffusionDither(const RageSurface *src, RageSurface *dst);
+namespace RageSurfaceUtils
+{
+	void OrderedDither(const RageSurface *src, RageSurface *dst);
+	void ErrorDiffusionDither(const RageSurface *src, RageSurface *dst);
+};
 
 #endif