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BlockLayerTypeEnum enumeration constants are used to describe the layers to which blocks belong. Blocks may be overlaid, for example, a text block may lay over a background picture block. 
typedef enum {
 BLT_Background,
 BLT_Foreground,
 BLT_Hidden
} BlockLayerTypeEnum;

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Elements

NameDescription
BLT\_BackgroundThe block belongs to background of the page.
BLT\_ForegroundThe block is on foreground of the page.
BLT\_HiddenThe block is hidden. Such blocks appear in the layout, if the IPageAnalysisParams::DetectTextOnPictures property was set to TRUE during recognition and text was found on a picture.

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Used in

IBlock::BlockLayerType RasterPictureBlock::SetBlockLayerType VectorPictureBlock::SetBlockLayerType