TIFFReadEncodedTile(3T)		     Image Format Library C++ Reference	Manual

NAME    [Toc]    [Back]

     TIFFReadEncodedTile - read	and decode a tile of data from an open TIFF
     file

SYNOPSIS    [Toc]    [Back]

     #include <tiffio.h>
     int TIFFReadEncodedTile(TIFF* tif,	u_long tile, u_char* buf, u_long size)

DESCRIPTION    [Toc]    [Back]

     Read the specified	tile of	data and place up to size bytes	of
     decompressed information in the (user supplied) data buffer.

NOTES    [Toc]    [Back]

     The value of tile is a ``raw tile number.''  That is, the caller must
     take into account whether or not the data are organized in	separate
     planes (PlanarConfiguration=2).  TIFFComputeTile automatically does this
     when converting an	(x,y,z,sample) coordinate quadruple to a tile number.
     To	read a full tile of data the data buffer should	be at least as large
     as	the value returned by TIFFTileSize.

     The library attempts to hide bit- and byte-ordering differences between
     the image and the native machine by converting data to the	native machine
     order.  Bit reversal is done if the FillOrder tag is opposite to the
     native machine bit	order.	16- and	32-bit samples are automatically
     byte-swapped if the file was written with a byte order opposite to	the
     native machine byte order,

RETURN VALUES    [Toc]    [Back]

     The actual	number of bytes	of data	that were placed in buf	is returned;
     TIFFReadEncodedTile returns -1 if an error	was encountered.

DIAGNOSTICS    [Toc]    [Back]

     All error messages	are directed to	the TIFFError(3T) routine.

SEE ALSO    [Toc]    [Back]

     libtiff(3T), TIFFOpen(3T),	TIFFReadRawTile(3T), TIFFReadTile(3T)


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