TIFFReadTile(3tiff) - phpMan

TIFFReadTile(3TIFF)                                                           TIFFReadTile(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, uint32 y, uint32 z, tsample_t sam-
       ple)

DESCRIPTION
       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 parame-
       ter is used only if data are organized in separate planes (PlanarConfiguration=2).

NOTES
       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
       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) routine.

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

       Libtiff library home page: http://www.remotesensing.org/libtiff/



libtiff                                 December 16, 1991                     TIFFReadTile(3TIFF)

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