TIFFReadScanline man page on FreeBSD

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TIFFReadScanline(3TIFF)				       TIFFReadScanline(3TIFF)

NAME
       TIFFReadScanline - read and decode a scanline of data from an open TIFF
       file

SYNOPSIS
       #include <tiffio.h>

       int TIFFReadScanline(TIFF *tif, tdata_t buf, uint32 row, tsample_t sam‐
       ple)

DESCRIPTION
       Read  the data for the specified row into the (user supplied) data buf‐
       fer buf.	 The data are returned decompressed and, in the	 native	 byte-
       and  bit-ordering,  but	are  otherwise packed (see further below). The
       buffer must be large enough to hold an entire scanline of data.	Appli‐
       cations	should	call the routine TIFFScanlineSize to find out the size
       (in bytes) of a scanline buffer.	 The row parameter is always  used  by
       TIFFReadScanline;  the  sample parameter is used only if data are orga‐
       nized in separate planes (PlanarConfiguration=2).

NOTES
       The library attempts to hide bit- and byte-ordering differences between
       the  image  and	the  native  machine  by converting data to the native
       machine order.  Bit reversal is done if the FillOrder tag  is  opposite
       to  the	native machine bit order. 16- and 32-bit samples are automati‐
       cally byte-swapped if the file was written with a byte  order  opposite
       to the native machine byte order,

       In C++ the sample parameter defaults to 0.

RETURN VALUES
       TIFFReadScanline	 returns  -1  if  it  detects an error; otherwise 1 is
       returned.

DIAGNOSTICS
       All error messages are directed to the TIFFError(3TIFF) routine.

       Compression  algorithm  does  not  support  random  access.   Data  was
       requested in a non-sequential order from a file that uses a compression
       algorithm and that has RowsPerStrip greater than one.  That is, data in
       the image is 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 accessed sequentially, or the
       file should be converted so that each strip is made up of  one  row  of
       data.

BUGS
       Reading subsampled YCbCR data does not work correctly because, for Pla‐
       narConfiguration=2 the size of a scanline is not calculated on  a  per-
       sample basis, and for PlanarConfiguration=1 the library does not unpack
       the block-interleaved samples; use the strip- and tile-based interfaces
       to read these formats.

SEE ALSO
       TIFFOpen(3TIFF),	 TIFFReadEncodedStrip(3TIFF), TIFFReadRawStrip(3TIFF),
       libtiff(3TIFF)

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

libtiff			       October 15, 1995	       TIFFReadScanline(3TIFF)
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