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

NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     #include <tiffio.h>
     tsize_t TIFFReadTile(TIFF*	tif, tdata_t buf, uint32 x, uint32 y, uint32
     z,	tsample_t sample)

DESCRIPTION    [Toc]    [Back]

     Return the	data for the tile containing the specified coordinates.	 The
     data placed in buf	are returned decompressed and, typically, in the
     native byte- and bit-ordering, but	are otherwise packed (see further
     below).  The buffer must be large enough to hold an entire	tile of	data.
     Applications should call the routine TIFFTileSize to find out the size
     (in bytes)	of a tile buffer.  The x and y parameters are always used by
     TIFFReadTile.  The	z parameter is used if the image is deeper than	1
     slice (ImageDepth>1).  The	sample parameter is used only if data are
     organized in separate planes (PlanarConfiguration=2).

NOTES    [Toc]    [Back]

     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]

     TIFFReadTile returns -1 if	it detects an error; otherwise the number of
     bytes in the decoded tile is returned.

DIAGNOSTICS    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

     libtiff(3T), TIFFCheckTile(3T), TIFFComputeTile(3T), TIFFOpen(3T),
     TIFFReadEncodedTile(3T), TIFFReadRawTile(3T)


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