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TIFFWriteScanline(3TIFF)						 TIFFWriteScanline(3TIFF)

NAME
       TIFFWriteScanline - write a scanline to an open TIFF file

SYNOPSIS
       #include <tiffio.h>

       int TIFFWriteScanline(TIFF *tif, tdata_t buf, uint32 row, tsample_t sample)

DESCRIPTION
       Write  data  to a file at the specified row. The sample parameter is used only if data are
       organized in separate planes (PlanarConfiguration=2).  The data are assumed to  be  uncom-
       pressed and in the native bit- and byte-order of the host machine. The data written to the
       file is compressed according to the compression scheme of the current TIFF directory  (see
       further below). If the current scanline is past the end of the current subfile, the Image-
       Length field is automatically increased to include the scanline (except for PlanarConfigu-
       ration=2, where the ImageLength cannot be changed once the first data are written). If the
       ImageLength is increased,  the  StripOffsets  and  StripByteCounts  fields  are	similarly
       enlarged to reflect data written past the previous end of image.

NOTES
       The library writes encoded data using the native machine byte order. Correctly implemented
       TIFF readers are expected to do any necessary byte-swapping  to	correctly  process  image
       data  with BitsPerSample greater than 8. The library attempts to hide bit-ordering differ-
       ences between the image and the native machine by converting data from the native  machine
       order.

       In C++ the sample parameter defaults to 0.

       Once  data are written to a file for the current directory, the values of certain tags may
       not be altered; see TIFFSetField(3TIFF) for more information.

       It is not possible to write scanlines to a file that uses a tiled organization.	The  rou-
       tine TIFFIsTiled can be used to determine if the file is organized as tiles or strips.

RETURN VALUES
       TIFFWriteScanline  returns  -1  if  it immediately detects an error and 1 for a successful
       write.

DIAGNOSTICS
       All error messages are directed to the TIFFError(3TIFF) routine.

       %s: File not open for writing .	The file was opened for reading, not writing.

       Can not write scanlines to a tiled image.  An attempt was made to write a  scanline  to	a
       tiled image. The image is assumed to be organized in tiles because the TileWidth and Tile-
       Length tags have been set with TIFFSetField(3TIFF).

       Compression algorithm does not support random access.  Data was written in  a  non-sequen-
       tial  order  to a file that uses a compression algorithm and that has RowsPerStrip greater
       than one. That is, data in the image is to be stored in a compressed form, and with multi-
       ple  rows packed into a strip. In this case, the library does not support random access to
       the data. The data should either be written as entire strips, sequentially by rows, or the
       value of RowsPerStrip should be set to one.

       %s:  Must  set  "ImageWidth" before writing data.  The image's width has not be set before
       the first write.  See TIFFSetField(3TIFF) for information on how to do this.

       %s: Must set "PlanarConfiguration" before writing data.	The organization of data has  not
       be  defined  before the first write.  See TIFFSetField(3TIFF) for information on how to do
       this.

       Can not change "ImageLength" when using separate planes. Separate image planes  are  being
       used  (PlanarConfiguration=2),  but  the  number of rows has not been specified before the
       first write. The library supports the dynamic growth of an image only when data are  orga-
       nized in a contiguous manner (PlanarConfiguration=1).

       %d:  Sample  out of range, max %d.  The sample parameter was greater than the value of the
       SamplesPerPixel tag.

       %s: No space for strip arrays .	There was not enough space for the arrays that hold strip
       offsets and byte counts.

BUGS
       Writing	subsampled  YCbCR data does not work correctly because, for PlanarConfiguration=2
       the size of a scanline is not calculated on a per-sample basis, and  for  PlanarConfigura-
       tion=1 the library does not pack the block-interleaved samples.

SEE ALSO
       TIFFOpen(3TIFF), TIFFWriteEncodedStrip(3TIFF), TIFFWriteRawStrip(3TIFF), libtiff(3TIFF)

       Libtiff library home page: http://www.remotesensing.org/libtiff/

libtiff 				December 16, 1991		 TIFFWriteScanline(3TIFF)
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