TIFFReadTile (3)

Leading comments

$Id: TIFFReadTile.3tiff,v 1.3 2016-09-25 20:05:50 bfriesen Exp $

Copyright (c) 1988-1997 Sam Leffler
Copyright (c) 1991-1997 Silicon Graphics, Inc.

Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee, provided
that (i) the above copyright notices and this permission notice appear in
all copies of the software and related documentation, and (ii) the names of
Sam Leffler and Silicon Graphics may not be used in...

(The comments found at the beginning of the groff file "man3/TIFFReadTile.3tiff".)

NAME

TIFFReadTile - read and decode a tile of data from an open 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 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: www.simplesystems.org/libtiff