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



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

SYNOPSIS
     #include <tiffio.h>
     tsizet TIFFReadTile(TIFF* tif, tdatat buf, uint32 x, uint32 y, uint32
     z, tsamplet sample)

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 parameter 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(3T) routine.

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


















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