TIFFReadTile(3T)TIFFReadTile(3T)NAMETIFFReadTile - 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 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 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.
DIAGNOSTICS
All error messages are directed to the TIFFError(3T) routine.
SEE ALSOlibtiff(3T), TIFFCheckTile(3T), TIFFComputeTile(3T), TIFFOpen(3T),
TIFFReadEncodedTile(3T), TIFFReadRawTile(3T)
December 16, 1991 TIFFReadTile(3T)
