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+.\" $Id: TIFFReadRGBATile.3tiff,v 1.2 2005-11-02 11:07:18 dron Exp $
+.\"
+.\" Copyright (c) 1991-1997 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 TIFFReadRGBATile 3TIFF "December 10, 1998" "libtiff"
+.SH NAME
+TIFFReadRGBATile \- read and decode an image tile into a fixed-format raster
+.SH SYNOPSIS
+.B "#include <tiffio.h>"
+.sp
+.B "#define TIFFGetR(abgr)	((abgr) & 0xff)"
+.br
+.B "#define TIFFGetG(abgr)	(((abgr) >> 8) & 0xff)"
+.br
+.B "#define TIFFGetB(abgr)	(((abgr) >> 16) & 0xff)"
+.br
+.B "#define TIFFGetA(abgr)	(((abgr) >> 24) & 0xff)"
+.sp
+.BI "int TIFFReadRGBATile(TIFF *" tif ", uint32 " x ", uint32 " y ", uint32 *" raster ")"
+.SH DESCRIPTION
+.IR TIFFReadRGBATile
+reads a single tile of a tile-based image into memory, storing the result in
+the user supplied RGBA
+.IR raster .
+The raster is assumed to be an array of width times length 32-bit entries,
+where width is the width of a tile (TIFFTAG_TILEWIDTH) and length is the
+height of a tile (TIFFTAG_TILELENGTH). 
+
+.PP
+The 
+.IR x
+and 
+.IR y
+values are the offsets from the top left corner to the top left corner of the
+tile to be read.  They must be an exact multiple of the tile width and length. 
+
+.PP
+Note that the raster is assume to be organized such that the pixel at location
+(\fIx\fP,\fIy\fP) is \fIraster\fP[\fIy\fP*\fIwidth\fP+\fIx\fP]; with the
+raster origin in the 
+.I lower-left hand corner
+of the tile. That is bottom to top organization.  Edge tiles which partly fall
+off the image will be filled out with appropriate zeroed areas.
+
+.PP
+Raster pixels are 8-bit packed red, green, blue, alpha samples. The macros
+.IR TIFFGetR ,
+.IR TIFFGetG ,
+.IR TIFFGetB ,
+and
+.I TIFFGetA
+should be used to access individual samples. Images without Associated Alpha
+matting information have a constant Alpha of 1.0 (255).
+.PP
+See the 
+.IR TIFFRGBAImage (3TIFF) 
+page for more details on how various image types are converted to RGBA values.
+.SH NOTES
+Samples must be either 1, 2, 4, 8, or 16 bits. Colorimetric samples/pixel must
+be either 1, 3, or 4 (i.e.
+.I SamplesPerPixel
+minus
+.IR ExtraSamples ).
+.PP
+Palette image colormaps that appear to be incorrectly written as 8-bit values
+are automatically scaled to 16-bits.
+.PP
+.I TIFFReadRGBATile
+is just a wrapper around the more general
+.IR TIFFRGBAImage (3TIFF)
+facilities.  It's main advantage over the similar 
+.IR TIFFReadRGBAImage() 
+function is that for large images a single buffer capable of holding the whole
+image doesn't need to be allocated, only enough for one tile.  The 
+.IR TIFFReadRGBAStrip() 
+function does a similar operation for stripped images.
+.SH "RETURN VALUES"
+1 is returned if the image was successfully read and converted.
+Otherwise, 0 is returned if an error was encountered.
+.SH DIAGNOSTICS
+All error messages are directed to the
+.IR TIFFError (3TIFF)
+routine.
+.PP
+.BR "Sorry, can not handle %d-bit pictures" .
+The image had
+.I BitsPerSample
+other than 1, 2, 4, 8, or 16.
+.PP
+.BR "Sorry, can not handle %d-channel images" .
+The image had
+.I SamplesPerPixel
+other than 1, 3, or 4.
+.PP
+\fBMissing needed "PhotometricInterpretation" tag\fP.
+The image did not have a tag that describes how to display the data.
+.PP
+\fBNo "PhotometricInterpretation" tag, assuming RGB\fP.
+The image was missing a tag that describes how to display it, but because it
+has 3 or 4 samples/pixel, it is assumed to be
+.SM RGB.
+.PP
+\fBNo "PhotometricInterpretation" tag, assuming min-is-black\fP.
+The image was missing a tag that describes how to display it,
+but because it has 1 sample/pixel, it is assumed to be a grayscale
+or bilevel image.
+.PP
+.BR "No space for photometric conversion table" .
+There was insufficient memory for a table used to convert
+image samples to 8-bit
+.SM RGB.
+.PP
+\fBMissing required "Colormap" tag\fP.
+A Palette image did not have a required
+.I Colormap
+tag.
+.PP
+.BR "No space for tile buffer" .
+There was insufficient memory to allocate an i/o buffer.
+.PP
+.BR "No space for strip buffer" .
+There was insufficient memory to allocate an i/o buffer.
+.PP
+.BR "Can not handle format" .
+The image has a format (combination of
+.IR BitsPerSample ,
+.IR SamplesPerPixel ,
+and
+.IR PhotometricInterpretation )
+that
+.I TIFFReadRGBAImage
+can not handle.
+.PP
+.BR "No space for B&W mapping table" .
+There was insufficient memory to allocate a table used to map
+grayscale data to
+.SM RGB.
+.PP
+.BR "No space for Palette mapping table" .
+There was insufficient memory to allocate a table used to map data to 8-bit
+.SM RGB.
+.SH "SEE ALSO"
+.BR TIFFOpen (3TIFF),
+.BR TIFFRGBAImage (3TIFF),
+.BR TIFFReadRGBAImage (3TIFF),
+.BR TIFFReadRGBAStrip (3TIFF),
+.BR libtiff (3TIFF)
+.PP
+Libtiff library home page:
+.BR http://www.remotesensing.org/libtiff/