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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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