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-.\" $Id: TIFFRGBAImage.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 TIFFRGBAImage 3TIFF "October 29, 2004" "libtiff"
-.SH NAME
-TIFFRGBAImageOK, TIFFRGBAImageBegin, TIFFRGBAImageGet, TIFFRGBAImageEnd
-\- read and decode an image into a raster
-.SH SYNOPSIS
-.B "#include <tiffio.h>"
-.sp
-.B "typedef unsigned char TIFFRGBValue;"
-.B "typedef struct _TIFFRGBAImage TIFFRGBAImage;"
-.sp
-.BI "int TIFFRGBAImageOK(TIFF *" tif ", char " emsg[1024] ")"
-.br
-.BI "int TIFFRGBAImageBegin(TIFFRGBAImage *" img ", TIFF* " tif ", int " stopOnError ", char " emsg[1024] ")"
-.br
-.BI "int TIFFRGBAImageGet(TIFFRGBAImage *" img ", uint32* " raster ", uint32 " width " , uint32 " height ")"
-.br
-.BI "void TIFFRGBAImageEnd(TIFFRGBAImage *" img ")"
-.br
-.SH DESCRIPTION
-The routines described here provide a high-level interface
-through which
-.SM TIFF
-images may be read into memory.
-Images may be strip- or tile-based and have a variety of different
-characteristics: bits/sample, samples/pixel, photometric, etc.
-Decoding state is encapsulated in a
-.I TIFFRGBAImage
-structure making it possible to capture state for multiple images
-and quickly switch between them.
-The target raster format can be customized to a particular application's
-needs by installing custom routines that manipulate image data
-according to application requirements.
-.PP
-The default usage for these routines is: check if an image can
-be processed using
-.IR TIFFRGBAImageOK ,
-construct a decoder state block using
-.IR TIFFRGBAImageBegin ,
-read and decode an image into a target raster using
-.IR TIFFRGBAImageGet ,
-and then
-release resources using
-.IR TIFFRGBAImageEnd .
-.I TIFFRGBAImageGet
-can be called multiple times to decode an image using different
-state parameters.
-If multiple images are to be displayed and there is not enough
-space for each of the decoded rasters, multiple state blocks can
-be managed and then calls can be made to
-.I TIFFRGBAImageGet
-as needed to display an image.
-.PP
-The generated raster is assumed to be an array of
-.I width
-times
-.I height
-32-bit entries, where
-.I width
-must be less than or equal to the width of the image (\c
-.I height
-may be any non-zero size).
-If the raster dimensions are smaller than the image, the image data
-is cropped to the raster bounds.
-If the raster height is greater than that of the image, then the
-image data are placed in the lower part of the raster.
-(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 
-.B lower-left
-hand corner.)
-.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
-.I TIFFRGBAImageGet
-converts non-8-bit images by scaling sample values.
-Palette, grayscale, bilevel, 
-.SM CMYK\c
-, and YCbCr images are converted to
-.SM RGB
-transparently.
-Raster pixels are returned uncorrected by any colorimetry information
-present in the directory.
-.PP
-The parameter
-.I stopOnError
-specifies how to act if an error is encountered while reading
-the image.
-If
-.I stopOnError
-is non-zero, then an error will terminate the operation; otherwise
-.I TIFFRGBAImageGet
-will continue processing data until all the possible data in the
-image have been requested.
-.SH "ALTERNATE RASTER FORMATS"
-To use the core support for reading and processing 
-.SM TIFF
-images, but write the resulting raster data in a different format
-one need only override the ``\fIput methods\fP'' used to store raster data.
-These methods are are defined in the
-.I TIFFRGBAImage
-structure and initially setup by
-.I TIFFRGBAImageBegin
-to point to routines that pack raster data in the default
-.SM ABGR
-pixel format.
-Two different routines are used according to the physical organization
-of the image data in the file: 
-.IR PlanarConfiguration =1
-(packed samples),
-and 
-.IR PlanarConfiguration =2
-(separated samples).
-Note that this mechanism can be used to transform the data before
-storing it in the raster.
-For example one can convert data
-to colormap indices for display on a colormap display.
-.SH "SIMULTANEOUS RASTER STORE AND DISPLAY"
-It is simple to display an image as it is being read into memory
-by overriding the put methods as described above for supporting
-alternate raster formats.
-Simply keep a reference to the default put methods setup by
-.I TIFFRGBAImageBegin
-and then invoke them before or after each display operation.
-For example, the
-.IR tiffgt (1)
-utility uses the following put method to update the display as
-the raster is being filled:
-.sp
-.nf
-.ft C
-static void
-putContigAndDraw(TIFFRGBAImage* img, uint32* raster,
-    uint32 x, uint32 y, uint32 w, uint32 h,
-    int32 fromskew, int32 toskew,
-    unsigned char* cp)
-{
-    (*putContig)(img, raster, x, y, w, h, fromskew, toskew, cp);
-    if (x+w == width) {
-	w = width;
-	if (img->orientation == ORIENTATION_TOPLEFT)
-	    lrectwrite(0, y-(h-1), w-1, y, raster-x-(h-1)*w);
-	else
-	    lrectwrite(0, y, w-1, y+h-1, raster);
-    }
-}
-.ft R
-.fi
-.sp
-(the original routine provided by the library is saved in the
-variable 
-.IR putContig .)
-.SH "SUPPORTING ADDITIONAL TIFF FORMATS"
-The
-.I TIFFRGBAImage
-routines support the most commonly encountered flavors of
-.SM TIFF.
-It is possible to extend this support by overriding the ``\fIget method\fP''
-invoked by
-.I TIFFRGBAImageGet
-to read 
-.SM TIFF
-image data.
-Details of doing this are a bit involved, it is best to make a copy
-of an existing get method and modify it to suit the needs of an
-application.
-.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.
-.SH "RETURN VALUES"
-All routines return
-1 if the operation was successful.
-Otherwise, 0 is returned if an error was encountered and
-.I stopOnError
-is zero.
-.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 can not be handled.
-.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 TIFFReadRGBAImage (3TIFF),
-.BR TIFFReadRGBAImageOriented (3TIFF),
-.BR TIFFReadRGBAStrip (3TIFF),
-.BR TIFFReadRGBATile (3TIFF),
-.BR libtiff (3TIFF)
-.PP
-Libtiff library home page:
-.BR http://www.remotesensing.org/libtiff/