src/tiff/man/TIFFWriteScanline.3tiff

.\" $Id: TIFFWriteScanline.3tiff,v 1.2 2005/11/02 11:07:18 dron 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 any advertising or
.\" publicity relating to the software without the specific, prior written
.\" permission of Sam Leffler and Silicon Graphics.
.\"
.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
.\" OF THIS SOFTWARE.
.\"
.if n .po 0
.TH TIFFWriteScanline 3TIFF "December 16, 1991" "libtiff"
.SH NAME
TIFFWriteScanline \- write a scanline to an open
.SM TIFF
file
.SH SYNOPSIS
.B "#include <tiffio.h>"
.sp
.BI "int TIFFWriteScanline(TIFF *" tif ", tdata_t " buf ", uint32 " row ", tsample_t " sample ")"
.SH DESCRIPTION
Write data to a file at the specified row. The
.I sample
parameter is used only if data are organized in separate planes (\c
.IR 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
.SM TIFF
directory (see further below). If the current scanline is past the end of the
current subfile, the
.I ImageLength
field is automatically increased to include the scanline (except
for
.IR PlanarConfiguration =2,
where the
.I ImageLength
cannot be changed once the first data are written). If the
.I ImageLength
is increased, the
.I StripOffsets
and
.I StripByteCounts
fields are similarly enlarged to reflect data written past the previous end of
image.
.SH NOTES
The library writes encoded data using the native machine byte order. Correctly
implemented
.SM 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.
.PP
In C++ the
.I sample
parameter defaults to 0.
.PP
Once data are written to a file for the current directory, the values of
certain tags may not be altered; see
.IR TIFFSetField (3TIFF)
for more information.
.PP
It is not possible to write scanlines to a file that uses a tiled
organization.  The routine
.IR TIFFIsTiled
can be used to determine if the file is organized as tiles or strips.
.SH "RETURN VALUES"
.IR TIFFWriteScanline
returns \-1 if it immediately detects an error and 1 for a successful write.
.SH DIAGNOSTICS
All error messages are directed to the
.IR TIFFError (3TIFF)
routine.
.PP
.BR "%s: File not open for writing .
The file was opened for reading, not writing.
.PP
.BR "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
.I TileWidth
and
.I TileLength
tags have been set with
.IR TIFFSetField (3TIFF).
.PP
.BR "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
.I 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
.I RowsPerStrip
should be set to one.
.PP
\fB%s: Must set "ImageWidth" before writing data\fP.
The image's width has not be set before the first write.
See
.BR TIFFSetField (3TIFF)
for information on how to do this.
.PP
\fB%s: Must set "PlanarConfiguration" before writing data\fP.
The organization of data has not be defined before the first write.
See
.BR TIFFSetField (3TIFF)
for information on how to do this.
.PP
\fBCan not change "ImageLength" when using separate planes\fP. Separate image
planes are being used (\c
.IR 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 (\c
.IR PlanarConfiguration =1).
.PP
.BR "%d: Sample out of range, max %d" .
The
.I sample
parameter was greater than the value of the SamplesPerPixel tag.
.PP
.BR "%s: No space for strip arrays .
There was not enough space for the arrays that hold strip offsets and byte
counts.
.SH BUGS
Writing subsampled YCbCR data does not work correctly because, for
.IR PlanarConfiguration =2
the size of a scanline is not calculated on a per-sample basis, and for
.IR PlanarConfiguration =1
the library does not pack the block-interleaved samples.
.SH "SEE ALSO"
.BR TIFFOpen (3TIFF),
.BR TIFFWriteEncodedStrip (3TIFF),
.BR TIFFWriteRawStrip (3TIFF),
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/
Commit	Line	Data
	1	.\" $Id: TIFFWriteScanline.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
	2	.\"
	3	.\" Copyright (c) 1988-1997 Sam Leffler
	4	.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	.\"
	6	.\" Permission to use, copy, modify, distribute, and sell this software and
	7	.\" its documentation for any purpose is hereby granted without fee, provided
	8	.\" that (i) the above copyright notices and this permission notice appear in
	9	.\" all copies of the software and related documentation, and (ii) the names of
	10	.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	.\" publicity relating to the software without the specific, prior written
	12	.\" permission of Sam Leffler and Silicon Graphics.
	13	.\"
	14	.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	.\"
	18	.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	.\" OF THIS SOFTWARE.
	24	.\"
	25	.if n .po 0
	26	.TH TIFFWriteScanline 3TIFF "December 16, 1991" "libtiff"
	27	.SH NAME
	28	TIFFWriteScanline \- write a scanline to an open
	29	.SM TIFF
	30	file
	31	.SH SYNOPSIS
	32	.B "#include <tiffio.h>"
	33	.sp
	34	.BI "int TIFFWriteScanline(TIFF *" tif ", tdata_t " buf ", uint32 " row ", tsample_t " sample ")"
	35	.SH DESCRIPTION
	36	Write data to a file at the specified row. The
	37	.I sample
	38	parameter is used only if data are organized in separate planes (\c
	39	.IR PlanarConfiguration =2).
	40	The data are assumed to be uncompressed and in the native bit- and byte-order
	41	of the host machine. The data written to the file is compressed according to
	42	the compression scheme of the current
	43	.SM TIFF
	44	directory (see further below). If the current scanline is past the end of the
	45	current subfile, the
	46	.I ImageLength
	47	field is automatically increased to include the scanline (except
	48	for
	49	.IR PlanarConfiguration =2,
	50	where the
	51	.I ImageLength
	52	cannot be changed once the first data are written). If the
	53	.I ImageLength
	54	is increased, the
	55	.I StripOffsets
	56	and
	57	.I StripByteCounts
	58	fields are similarly enlarged to reflect data written past the previous end of
	59	image.
	60	.SH NOTES
	61	The library writes encoded data using the native machine byte order. Correctly
	62	implemented
	63	.SM TIFF
	64	readers are expected to do any necessary byte-swapping to correctly process
	65	image data with BitsPerSample greater than 8. The library attempts to hide
	66	bit-ordering differences between the image and the native machine by
	67	converting data from the native machine order.
	68	.PP
	69	In C++ the
	70	.I sample
	71	parameter defaults to 0.
	72	.PP
	73	Once data are written to a file for the current directory, the values of
	74	certain tags may not be altered; see
	75	.IR TIFFSetField (3TIFF)
	76	for more information.
	77	.PP
	78	It is not possible to write scanlines to a file that uses a tiled
	79	organization. The routine
	80	.IR TIFFIsTiled
	81	can be used to determine if the file is organized as tiles or strips.
	82	.SH "RETURN VALUES"
	83	.IR TIFFWriteScanline
	84	returns \-1 if it immediately detects an error and 1 for a successful write.
	85	.SH DIAGNOSTICS
	86	All error messages are directed to the
	87	.IR TIFFError (3TIFF)
	88	routine.
	89	.PP
	90	.BR "%s: File not open for writing .
	91	The file was opened for reading, not writing.
	92	.PP
	93	.BR "Can not write scanlines to a tiled image" .
	94	An attempt was made to write a scanline to a tiled image. The image is assumed
	95	to be organized in tiles because the
	96	.I TileWidth
	97	and
	98	.I TileLength
	99	tags have been set with
	100	.IR TIFFSetField (3TIFF).
	101	.PP
	102	.BR "Compression algorithm does not support random access" .
	103	Data was written in a non-sequential order to a file that uses a compression
	104	algorithm and that has
	105	.I RowsPerStrip
	106	greater than one. That is, data in the image is to be stored in a compressed
	107	form, and with multiple rows packed into a strip. In this case, the library
	108	does not support random access to the data. The data should either be written
	109	as entire strips, sequentially by rows, or the value of
	110	.I RowsPerStrip
	111	should be set to one.
	112	.PP
	113	\fB%s: Must set "ImageWidth" before writing data\fP.
	114	The image's width has not be set before the first write.
	115	See
	116	.BR TIFFSetField (3TIFF)
	117	for information on how to do this.
	118	.PP
	119	\fB%s: Must set "PlanarConfiguration" before writing data\fP.
	120	The organization of data has not be defined before the first write.
	121	See
	122	.BR TIFFSetField (3TIFF)
	123	for information on how to do this.
	124	.PP
	125	\fBCan not change "ImageLength" when using separate planes\fP. Separate image
	126	planes are being used (\c
	127	.IR PlanarConfiguration =2),
	128	but the number of rows has not been specified before the first write. The
	129	library supports the dynamic growth of an image only when data are organized
	130	in a contiguous manner (\c
	131	.IR PlanarConfiguration =1).
	132	.PP
	133	.BR "%d: Sample out of range, max %d" .
	134	The
	135	.I sample
	136	parameter was greater than the value of the SamplesPerPixel tag.
	137	.PP
	138	.BR "%s: No space for strip arrays .
	139	There was not enough space for the arrays that hold strip offsets and byte
	140	counts.
	141	.SH BUGS
	142	Writing subsampled YCbCR data does not work correctly because, for
	143	.IR PlanarConfiguration =2
	144	the size of a scanline is not calculated on a per-sample basis, and for
	145	.IR PlanarConfiguration =1
	146	the library does not pack the block-interleaved samples.
	147	.SH "SEE ALSO"
	148	.BR TIFFOpen (3TIFF),
	149	.BR TIFFWriteEncodedStrip (3TIFF),
	150	.BR TIFFWriteRawStrip (3TIFF),
	151	.BR libtiff (3TIFF)
	152	.PP
	153	Libtiff library home page:
	154	.BR http://www.remotesensing.org/libtiff/