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tif_aux.cs
executable file
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tif_aux.cs
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// tif_aux.cs
//
// Based on LIBTIFF, Version 3.9.4 - 15-Jun-2010
// Copyright (c) 2006-2010 by the Authors
// 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.
// TIFF Library.
//
// Auxiliary Support Routines.
using System;
using System.Collections.Generic;
using System.Text;
namespace Free.Ports.LibTiff
{
public static partial class libtiff
{
static bool TIFFDefaultTransferFunction(TIFFDirectory td)
{
ushort[][] tf=td.td_transferfunction;
tf[0]=tf[1]=tf[2]=null;
if(td.td_bitspersample>=4*8-2) return false; //4: sizeof(tsize_t)
int n=1<<td.td_bitspersample;
try
{
tf[0]=new ushort[n];
tf[0][0]=0;
for(int i=1; i<n; i++)
{
double t=(double)i/((double)n-1.0);
tf[0][i]=(ushort)Math.Floor(65535*Math.Pow(t, 2.2)+0.5);
}
if(td.td_samplesperpixel-td.td_extrasamples>1)
{
tf[1]=new ushort[n];
tf[2]=new ushort[n];
tf[0].CopyTo(tf[1], 0);
tf[0].CopyTo(tf[2], 0);
}
return true;
}
catch
{
tf[0]=tf[1]=tf[2]=null;
return false;
}
}
static bool TIFFDefaultRefBlackWhite(TIFFDirectory td)
{
if(td.td_photometric==PHOTOMETRIC.YCBCR)
{
// YCbCr (Class Y) images must have the
// ReferenceBlackWhite tag set. Fix the
// broken images, which lacks that tag.
try
{
td.td_refblackwhite=new double[] { 0.0, 255.0, 128.0, 255.0, 128.0, 255.0 };
}
catch
{
return false;
}
}
else
{
try
{
td.td_refblackwhite=new double[6];
}
catch
{
return false;
}
// Assume RGB (Class R)
for(int i=0; i<3; i++)
{
td.td_refblackwhite[2*i+0]=0.0;
td.td_refblackwhite[2*i+1]=(double)((1<<td.td_bitspersample)-1);
}
}
return true;
}
// Like TIFFGetField, but return any default
// value if the tag is not present in the directory.
//
// NB: We use the value in the directory, rather than
// explicit values so that defaults exist only in one
// place in the library -- in TIFFDefaultDirectory.
public static bool TIFFVGetFieldDefaulted(TIFF tif, TIFFTAG tag, object[] ap)
{
TIFFDirectory td=tif.tif_dir;
if(TIFFVGetField(tif, tag, ap)) return true;
switch(tag)
{
case TIFFTAG.SUBFILETYPE:
ap[0]=td.td_subfiletype;
return true;
case TIFFTAG.BITSPERSAMPLE:
ap[0]=td.td_bitspersample;
return true;
case TIFFTAG.THRESHHOLDING:
ap[0]=td.td_threshholding;
return true;
case TIFFTAG.FILLORDER:
ap[0]=td.td_fillorder;
return true;
case TIFFTAG.ORIENTATION:
ap[0]=td.td_orientation;
return true;
case TIFFTAG.SAMPLESPERPIXEL:
ap[0]=td.td_samplesperpixel;
return true;
case TIFFTAG.ROWSPERSTRIP:
ap[0]=td.td_rowsperstrip;
return true;
case TIFFTAG.MINSAMPLEVALUE:
ap[0]=td.td_minsamplevalue;
return true;
case TIFFTAG.MAXSAMPLEVALUE:
ap[0]=td.td_maxsamplevalue;
return true;
case TIFFTAG.PLANARCONFIG:
ap[0]=td.td_planarconfig;
return true;
case TIFFTAG.RESOLUTIONUNIT:
ap[0]=td.td_resolutionunit;
return true;
case TIFFTAG.PREDICTOR:
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
ap[0]=sp.predictor;
return true;
case TIFFTAG.DOTRANGE:
ap[0]=0;
ap[1]=(1<<td.td_bitspersample)-1;
return true;
case TIFFTAG.INKSET:
ap[0]=INKSET.CMYK;
return true;
case TIFFTAG.NUMBEROFINKS:
ap[0]=(ushort)4;
return true;
case TIFFTAG.EXTRASAMPLES:
ap[0]=td.td_extrasamples;
ap[1]=td.td_sampleinfo;
return true;
case TIFFTAG.MATTEING:
ap[0]=(ushort)((td.td_extrasamples==1&&td.td_sampleinfo[0]==(ushort)EXTRASAMPLE.ASSOCALPHA)?1:0);
return true;
case TIFFTAG.TILEDEPTH:
ap[0]=td.td_tiledepth;
return true;
case TIFFTAG.DATATYPE:
ap[0]=td.td_sampleformat-1;
return true;
case TIFFTAG.SAMPLEFORMAT:
ap[0]=td.td_sampleformat;
return true;
case TIFFTAG.IMAGEDEPTH:
ap[0]=td.td_imagedepth;
return true;
case TIFFTAG.YCBCRCOEFFICIENTS:
// defaults are from CCIR Recommendation 601-1
double[] ycbcrcoeffs=new double[] { 0.299, 0.587, 0.114 };
ap[0]=ycbcrcoeffs;
return true;
case TIFFTAG.YCBCRSUBSAMPLING:
ap[0]=td.td_ycbcrsubsampling[0];
ap[1]=td.td_ycbcrsubsampling[1];
return true;
case TIFFTAG.YCBCRPOSITIONING:
ap[0]=td.td_ycbcrpositioning;
return true;
case TIFFTAG.WHITEPOINT:
// TIFF 6.0 specification tells that it is no default
// value for the WhitePoint, but AdobePhotoshop TIFF
// Technical Note tells that it should be CIE D50.
ap[0]=new double[] { D50_X0/(D50_X0+D50_Y0+D50_Z0), D50_Y0/(D50_X0+D50_Y0+D50_Z0) };
return true;
case TIFFTAG.TRANSFERFUNCTION:
if(td.td_transferfunction[0]==null&&!TIFFDefaultTransferFunction(td))
{
TIFFErrorExt(tif.tif_clientdata, tif.tif_name, "No space for \"TransferFunction\" tag");
return false;
}
ap[0]=td.td_transferfunction[0];
if(td.td_samplesperpixel-td.td_extrasamples>1)
{
ap[1]=td.td_transferfunction[1];
ap[2]=td.td_transferfunction[2];
}
return true;
case TIFFTAG.REFERENCEBLACKWHITE:
{
if(td.td_refblackwhite==null&&!TIFFDefaultRefBlackWhite(td)) return false;
ap[0]=td.td_refblackwhite;
return true;
}
}
return false;
}
// Like TIFFGetField, but return any default
// value if the tag is not present in the directory.
public static bool TIFFGetFieldDefaulted(TIFF tif, TIFFTAG tag, object[] ap)
{
return TIFFVGetFieldDefaulted(tif, tag, ap);
}
}
}