Method frameListFromList

src/IECore/FileSequenceFunctions.cpp:314–375

}

FrameListPtr IECore::frameListFromList( const std::vector< FrameList::Frame > &frames )
{
	if ( frames.size() == 0 )
	{
		return new EmptyFrameList();
	}
	else if ( frames.size() == 1 )
	{
		return new FrameRange( frames[0], frames[0] );
	}

	std::vector< FrameListPtr > frameLists;

	FrameList::Frame rangeStart = 0;
	FrameList::Frame rangeEnd = 1;
	FrameList::Frame rangeStep = frames[ rangeEnd ] - frames[ rangeStart ];

	while ( rangeEnd <= (FrameList::Frame)frames.size() )
	{
		if ( rangeEnd == (FrameList::Frame)frames.size() || frames[ rangeEnd ] - frames[ rangeEnd -1 ] != rangeStep )
		{
			/// we've come to the end of a run
			if ( rangeEnd - 1 == rangeStart )
			{
				frameLists.push_back( new FrameRange( frames[ rangeStart ], frames[ rangeStart ] ) );
			}
			else
			{
				if ( rangeStep > 0)
				{
					frameLists.push_back( new FrameRange( frames[ rangeStart ], frames[ rangeEnd -1 ], rangeStep ) );
				}
				else
				{
					frameLists.push_back( new ReversedFrameList( new FrameRange(frames[ rangeEnd -1 ], frames[ rangeStart ], -rangeStep ) ));
				}
			}

			rangeStart = rangeEnd;
			rangeEnd = rangeStart + 1;

			if ( rangeEnd < (FrameList::Frame)frames.size() )
			{
				rangeStep = frames[ rangeEnd ] - frames[ rangeStart ];
			}
		}
		else
		{
			rangeEnd ++;
		}
	}

	if ( frameLists.size() == 1 )
	{
		return frameLists[0];
	}
	else
	{