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TIFFReadTile - read and decode a tile of data from an open TIFF file
tsize_t TIFFReadTile(TIFF* tif, tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t sam-
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).
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,
TIFFReadTile returns -1 if it detects an error; otherwise the number of bytes in the
decoded tile is returned.
All error messages are directed to the TIFFError(3T) routine.
libtiff(3T), TIFFCheckTile(3T), TIFFComputeTile(3T), TIFFOpen(3T), TIFFReadEncod-
December 16, 1991 TIFFReadTile(3T)
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