add GetFrameCountFromFileName

stepmania/src/RageTexture.cpp

@@ -101,6 +101,13 @@ void RageTexture::GetFrameDimensionsFromFileName( CString sPath, int* piFramesWi
 
 }
 
+int RageTexture::GetFrameCountFromFileName( CString sPath )
+{
+	int wide, high;
+	GetFrameDimensionsFromFileName(sPath, &wide, &high );
+	return wide*high;
+}
+
 const RectF *RageTexture::GetTextureCoordRect( int frameNo ) const
 {
 	return &m_TextureCoordRects[frameNo];

stepmania/src/RageTexture.h

@@ -91,6 +91,7 @@ public:
 	const RageTextureID &GetActualID() const { return m_ActualID; }
 
 	static void GetFrameDimensionsFromFileName( CString sPath, int* puFramesWide, int* puFramesHigh );
+	static int GetFrameCountFromFileName( CString sPath );
 
 private:
 	/* The file we were asked to load.  (This is never changed.) */