TIFFWriteScanline(3T) Image Format Library C++ Reference Manual
TIFFWriteScanline - write a scanline to an open TIFF file
#include <tiffio.h>
int TIFFWriteScanline(TIFF* tif, tdata_t buf, uint32 row, tsample_t
sample)
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 byteorder
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.
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(3T) 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.
TIFFWriteScanline returns -1 if it immediately detects an error and 1 for
a successful write.
All error messages are directed to the TIFFError(3T) 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
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TIFFWriteScanline(3T) Image Format Library C++ Reference Manual
TIFFSetField(3T).
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 "ImageWidth" before writing data. The image's width has not
be set before the first write. See TIFFSetField(3T) 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(3T)
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 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 persample
basis, and for PlanarConfiguration=1 the library does not pack the
block-interleaved samples.
libtiff(3T), TIFFOpen(3T), TIFFWriteEncodedStrip(3T),
TIFFWriteRawStrip(3T)
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