TIFFReadTile(3tiff)

TIFFReadTile(3TIFF)MISC. REFERENCE MANUAL PAGETIFFReadTile(3TIFF)

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

DESCRIPTION

     Return the data for the tile containing the specified  coor-
     dinates.  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

     The library attempts to hide bit- and byte-ordering  differ-
     ences 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

     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(3TIFF) rou-
     tine.

SEE ALSO

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

libtiff          Last change: December 16, 1991                 1