This class implements the ImgData interface and allows to obtain data from different sources. Here, one source is represented by an ImgData and a component index. The typical use of this class is when the encoder needs different components (Red, Green, Blue, alpha, ...) from different input files (i.e. from different ImgReader objects).

All input ImgData must not be tiled (i.e. must have only 1 tile) and the image origin must be the canvas origin. The different inputs can have different dimensions though (this will lead to different subsampling factors for each component).

The input ImgData and component index list must be defined when constructing this class and can not be modified later.

'Declaration
 
Public Class ImgDataJoiner 
   Implements BlkImgDataSrc, ImgData 

public class ImgDataJoiner : BlkImgDataSrc, ImgData