Helper function for resampling.

function BuildMappingTable(DstLow: LongInt; 
                           DstHigh: LongInt; 
                           SrcLow: LongInt; 
                           SrcHigh: LongInt; 
                           SrcImageWidth: LongInt; 
                           Filter: TFilterFunction; 
                           Radius: Single; 
                           WrapEdges: Boolean): TMappingTable;

ImagingFormats (at line 187)