Read and write TICKCOUNTS. Invalidate cache.

At this time, the tag does nothing.
That will hopefully change within the week.

src/NotesLoaderSM.cpp

@@ -308,6 +308,39 @@ void SMLoader::LoadTimingFromSMFile( const MsdFile &msd, TimingData &out )
 				out.AddTimeSignatureSegment( seg );
 			}
 		}
+		
+		else if( sValueName=="TICKCOUNTS" )
+		{
+			vector<RString> arrayTickcountExpressions;
+			split( sParams[1], ",", arrayTickcountExpressions );
+			
+			for( unsigned f=0; f<arrayTickcountExpressions.size(); f++ )
+			{
+				vector<RString> arrayTickcountValues;
+				split( arrayTickcountExpressions[f], "=", arrayTickcountValues );
+				if( arrayTickcountValues.size() != 2 )
+				{
+					// XXX: Hard to tell which file caused this.
+					LOG->UserLog( "Song file", "(UNKNOWN)", "has an invalid #%s value \"%s\" (must have exactly one '='), ignored.",
+						     sValueName.c_str(), arrayTickcountExpressions[f].c_str() );
+					continue;
+				}
+				
+				const float fTickcountBeat = StringToFloat( arrayTickcountValues[0] );
+				const int iTicks = atoi( arrayTickcountValues[1] );
+				TickcountSegment new_seg( BeatToNoteRow(fTickcountBeat), iTicks );
+				
+				if(iTicks >= 1 && iTicks <= ROWS_PER_BEAT ) // Constants
+				{
+					// LOG->Trace( "Adding a tickcount segment: beat: %f, ticks = %d", fTickcountBeat, iTicks );
+					out.AddTickcountSegment( new_seg );
+				}
+				else
+				{
+					LOG->UserLog( "Song file", "(UNKNOWN)", "has an invalid tickcount at beat %f, ticks %d.", fTickcountBeat, iTicks );
+				}
+			}
+		}
 
 		// warps (replacement for Negative BPM and Negative Stops)
 		/*

src/NotesWriterSM.cpp

@@ -162,6 +162,18 @@ static void WriteGlobalTags( RageFile &f, const Song &out )
 	}
 	f.PutLine( ";" );
 
+	ASSERT( !out.m_Timing.m_TickcountSegments.empty() );
+	f.Write( "#TICKCOUNTS:" );
+	for( unsigned i=0; i<out.m_Timing.m_TickcountSegments.size(); i++ )
+	{
+		const TickcountSegment &ts = out.m_Timing.m_TickcountSegments[i];
+		
+		f.PutLine( ssprintf( "%.6f=%d", NoteRowToBeat(ts.m_iStartRow), ts.m_iTicks ) );
+		if( i != out.m_Timing.m_TickcountSegments.size()-1 )
+			f.Write( "," );
+	}
+	f.PutLine( ";" );
+	
 	FOREACH_BackgroundLayer( b )
 	{
 		if( b==0 )

src/Song.cpp

@@ -34,7 +34,7 @@
 #include <set>
 #include <float.h>
 
-const int FILE_CACHE_VERSION = 161;	// increment this to invalidate cache
+const int FILE_CACHE_VERSION = 162;	// increment this to invalidate cache
 
 const float DEFAULT_MUSIC_SAMPLE_LENGTH = 12.f;
 
@@ -758,6 +758,19 @@ void Song::TidyUpData()
 		seg.m_iDenominator = 4;
 		m_Timing.m_vTimeSignatureSegments.push_back( seg );
 	}
+	
+	/*
+	 * Likewise, if no tickcount signature is specified, assume 2 ticks
+	 * per beat for the entire song. The default of 2 is chosen more
+	 * for compatibility with the Pump Pro series than anything else.
+	 */
+	if( m_Timing.m_TickcountSegments.empty() )
+	{
+		TickcountSegment seg;
+		seg.m_iStartRow = 0;
+		seg.m_iTicks = 2;
+		m_Timing.m_TickcountSegments.push_back( seg );
+	}
 }
 
 void Song::TranslateTitles()