TIFFReadTile(3TIFF)TIFFReadTile(3TIFF)NAMETIFFReadTile - 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 sample)
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).
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 automati‐
cally byte-swapped if the file was written with a byte order opposite
to the native machine byte order,
RETURN VALUESTIFFReadTile 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(3TIFF) routine.
SEE ALSOTIFFCheckTile(3TIFF), TIFFComputeTile(3TIFF), TIFFOpen(3TIFF), TIFF‐
ReadEncodedTile(3TIFF), TIFFReadRawTile(3TIFF), libtiff(3TIFF)
Libtiff library home page: http://www.remotesensing.org/libtiff/
libtiff December 16, 1991 TIFFReadTile(3TIFF)