TIFFReadTile man page on BSDOS

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TIFFReadTile(3T)				 TIFFReadTile(3T)

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

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

DESCRIPTION
       Return  the  data  for  the  tile containing the specified
       coordinates.  The data placed in buf are	 returned  decom-
       pressed and, typically, in the native byte- and bit-order-
       ing, 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
       The library attempts to hide bit- and  byte-ordering  dif-
       ferences	 between the image and the native machine by con-
       verting 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	automati-
       cally  byte-swapped  if	the  file was written with a byte
       order opposite to the native machine byte order,

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

DIAGNOSTICS
       All  error messages are directed to the TIFFError(3T) rou-
       tine.

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

			December 16, 1991			1

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