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libsdl2_image/external/tiff-4.0.9/man/TIFFWriteScanline.3tiff
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libsdl2_image/external/tiff-4.0.9/man/TIFFWriteScanline.3tiff
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.\" $Id: TIFFWriteScanline.3tiff,v 1.3 2016-09-25 20:05:50 bfriesen Exp $
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.\"
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.\" Copyright (c) 1988-1997 Sam Leffler
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.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and
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.\" its documentation for any purpose is hereby granted without fee, provided
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.\" that (i) the above copyright notices and this permission notice appear in
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.\" all copies of the software and related documentation, and (ii) the names of
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.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
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.\" publicity relating to the software without the specific, prior written
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.\" permission of Sam Leffler and Silicon Graphics.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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.\" OF THIS SOFTWARE.
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.\"
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.if n .po 0
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.TH TIFFWriteScanline 3TIFF "December 16, 1991" "libtiff"
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.SH NAME
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TIFFWriteScanline \- write a scanline to an open
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.SM TIFF
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file
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.SH SYNOPSIS
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.B "#include <tiffio.h>"
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.sp
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.BI "int TIFFWriteScanline(TIFF *" tif ", tdata_t " buf ", uint32 " row ", tsample_t " sample ")"
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.SH DESCRIPTION
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Write data to a file at the specified row. The
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.I sample
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parameter is used only if data are organized in separate planes (\c
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.IR PlanarConfiguration =2).
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The data are assumed to be uncompressed and in the native bit- and byte-order
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of the host machine. The data written to the file is compressed according to
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the compression scheme of the current
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.SM TIFF
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directory (see further below). If the current scanline is past the end of the
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current subfile, the
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.I ImageLength
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field is automatically increased to include the scanline (except
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for
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.IR PlanarConfiguration =2,
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where the
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.I ImageLength
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cannot be changed once the first data are written). If the
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.I ImageLength
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is increased, the
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.I StripOffsets
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and
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.I StripByteCounts
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fields are similarly enlarged to reflect data written past the previous end of
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image.
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.SH NOTES
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The library writes encoded data using the native machine byte order. Correctly
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implemented
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.SM TIFF
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readers are expected to do any necessary byte-swapping to correctly process
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image data with BitsPerSample greater than 8. The library attempts to hide
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bit-ordering differences between the image and the native machine by
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converting data from the native machine order.
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.PP
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In C++ the
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.I sample
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parameter defaults to 0.
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.PP
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Once data are written to a file for the current directory, the values of
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certain tags may not be altered; see
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.IR TIFFSetField (3TIFF)
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for more information.
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.PP
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It is not possible to write scanlines to a file that uses a tiled
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organization. The routine
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.IR TIFFIsTiled
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can be used to determine if the file is organized as tiles or strips.
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.SH "RETURN VALUES"
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.IR TIFFWriteScanline
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returns \-1 if it immediately detects an error and 1 for a successful write.
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.SH DIAGNOSTICS
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All error messages are directed to the
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.IR TIFFError (3TIFF)
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routine.
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.PP
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.BR "%s: File not open for writing .
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The file was opened for reading, not writing.
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.PP
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.BR "Can not write scanlines to a tiled image" .
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An attempt was made to write a scanline to a tiled image. The image is assumed
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to be organized in tiles because the
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.I TileWidth
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and
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.I TileLength
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tags have been set with
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.IR TIFFSetField (3TIFF).
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.PP
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.BR "Compression algorithm does not support random access" .
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Data was written in a non-sequential order to a file that uses a compression
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algorithm and that has
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.I RowsPerStrip
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greater than one. That is, data in the image is to be stored in a compressed
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form, and with multiple rows packed into a strip. In this case, the library
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does not support random access to the data. The data should either be written
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as entire strips, sequentially by rows, or the value of
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.I RowsPerStrip
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should be set to one.
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.PP
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\fB%s: Must set "ImageWidth" before writing data\fP.
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The image's width has not be set before the first write.
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See
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.BR TIFFSetField (3TIFF)
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for information on how to do this.
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.PP
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\fB%s: Must set "PlanarConfiguration" before writing data\fP.
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The organization of data has not be defined before the first write.
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See
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.BR TIFFSetField (3TIFF)
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for information on how to do this.
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.PP
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\fBCan not change "ImageLength" when using separate planes\fP. Separate image
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planes are being used (\c
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.IR PlanarConfiguration =2),
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but the number of rows has not been specified before the first write. The
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library supports the dynamic growth of an image only when data are organized
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in a contiguous manner (\c
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.IR PlanarConfiguration =1).
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.PP
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.BR "%d: Sample out of range, max %d" .
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The
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.I sample
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parameter was greater than the value of the SamplesPerPixel tag.
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.PP
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.BR "%s: No space for strip arrays .
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There was not enough space for the arrays that hold strip offsets and byte
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counts.
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.SH BUGS
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Writing subsampled YCbCR data does not work correctly because, for
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.IR PlanarConfiguration =2
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the size of a scanline is not calculated on a per-sample basis, and for
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.IR PlanarConfiguration =1
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the library does not pack the block-interleaved samples.
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.SH "SEE ALSO"
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.BR TIFFOpen (3TIFF),
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.BR TIFFWriteEncodedStrip (3TIFF),
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.BR TIFFWriteRawStrip (3TIFF),
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.BR libtiff (3TIFF)
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.PP
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Libtiff library home page:
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.BR http://www.simplesystems.org/libtiff/
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