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Rename

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<title>TIFFWriteScanline</title>

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<body>

<h1 align="center">TIFFWriteScanline</h1>

<a href="#NAME">NAME</a> 
<a href="#SYNOPSIS">SYNOPSIS</a> 
<a href="#DESCRIPTION">DESCRIPTION</a> 
<a href="#NOTES">NOTES</a> 
<a href="#RETURN VALUES">RETURN VALUES</a> 
<a href="#DIAGNOSTICS">DIAGNOSTICS</a> 
<a href="#BUGS">BUGS</a> 
<a href="#SEE ALSO">SEE ALSO</a>

<hr>

TIFFWriteScanline
&minus; write a scanline to an open TIFF
file

<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>

#include
&lt;tiffio.h&gt;

int
TIFFWriteScanline(TIFF *tif, tdata_t
buf, uint32_t row, tsample_t
sample)

<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>

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
uncompressed 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
ImageLength field is automatically increased to
include the scanline (except for
PlanarConfiguration=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.

<h2>NOTES
<a name="NOTES"></a>
</h2>

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 differences 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 routine TIFFIsTiled can be used to
determine if the file is organized as tiles or strips.

<h2>RETURN VALUES
<a name="RETURN VALUES"></a>
</h2>

TIFFWriteScanline
returns &minus;1 if it immediately detects an error and 1
for a successful write.

<h2>DIAGNOSTICS
<a name="DIAGNOSTICS"></a>
</h2>

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
TileLength tags have been set with
TIFFSetField(3TIFF).

Compression
algorithm does not support random access. Data was
written in a non-sequential 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 multiple 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
&quot;ImageWidth&quot; before writing data. The
image&rsquo;s width has not be set before the first write.
See TIFFSetField(3TIFF) for information on how to do
this.

%s: Must set
&quot;PlanarConfiguration&quot; 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 &quot;ImageLength&quot; 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
organized 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.

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
PlanarConfiguration=1 the library does not pack the
block-interleaved samples.

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

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