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tif_predict.cs
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tif_predict.cs
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// tif_predict.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.
//
// Predictor Tag Support (used by multiple codecs).
using System;
using System.Collections.Generic;
using System.IO;
namespace Free.Ports.LibTiff
{
public static partial class libtiff
{
// "Library-private" Support for the Predictor Tag
// Codecs that want to support the Predictor tag must place
// this structure first in their private state block so that
// the predictor code can cast tif_data to find its state.
class TIFFPredictorState : ICodecState
{
internal PREDICTOR predictor; // predictor tag value
internal int stride; // sample stride over data
internal int rowsize; // tile/strip row size
internal TIFFCodeMethod encoderow; // parent codec encode row
internal TIFFCodeMethod encodestrip; // parent codec encode strip
internal TIFFCodeMethod encodetile; // parent codec encode tile
internal TIFFPostMethod encodepfunc; // horizontal differencer
internal TIFFCodeMethod decoderow; // parent codec decode row
internal TIFFCodeMethod decodestrip; // parent codec decode strip
internal TIFFCodeMethod decodetile; // parent codec decode tile
internal TIFFPostMethod decodepfunc; // horizontal accumulator
internal TIFFVGetMethod vgetparent; // super-class method
internal TIFFVSetMethod vsetparent; // super-class method
internal TIFFPrintMethod printdir; // super-class method
internal TIFFBoolMethod setupdecode; // super-class method
internal TIFFBoolMethod setupencode; // super-class method
}
static bool PredictorSetup(TIFF tif)
{
string module="PredictorSetup";
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
TIFFDirectory td=tif.tif_dir;
switch(sp.predictor)
{
case PREDICTOR.NONE: return true; // no differencing
case PREDICTOR.HORIZONTAL:
if(td.td_bitspersample!=8&&td.td_bitspersample!=16&&td.td_bitspersample!=32)
{
TIFFErrorExt(tif.tif_clientdata, module, "Horizontal differencing \"Predictor\" not supported with {0}-bit samples", td.td_bitspersample);
return false;
}
break;
case PREDICTOR.FLOATINGPOINT:
if(td.td_sampleformat!=SAMPLEFORMAT.IEEEFP)
{
TIFFErrorExt(tif.tif_clientdata, module, "Floating point \"Predictor\" not supported with {0} data format", td.td_sampleformat);
return false;
}
break;
default:
TIFFErrorExt(tif.tif_clientdata, module, "\"Predictor\" value {0} not supported", sp.predictor);
return false;
}
sp.stride=(td.td_planarconfig==PLANARCONFIG.CONTIG?(int)td.td_samplesperpixel:1);
// Calculate the scanline/tile-width size in bytes.
if(isTiled(tif)) sp.rowsize=TIFFTileRowSize(tif);
else sp.rowsize=TIFFScanlineSize(tif);
return true;
}
static bool PredictorSetupDecode(TIFF tif)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
TIFFDirectory td=tif.tif_dir;
if(!sp.setupdecode(tif)||!PredictorSetup(tif)) return false;
if(sp.predictor==PREDICTOR.HORIZONTAL)
{
switch(td.td_bitspersample)
{
case 8: sp.decodepfunc=horAcc8; break;
case 16: sp.decodepfunc=horAcc16; break;
case 32: sp.decodepfunc=horAcc32; break;
}
// Override default decoding method with one that does the
// predictor stuff.
if(tif.tif_decoderow!=PredictorDecodeRow)
{
sp.decoderow=tif.tif_decoderow;
tif.tif_decoderow=PredictorDecodeRow;
sp.decodestrip=tif.tif_decodestrip;
tif.tif_decodestrip=PredictorDecodeTile;
sp.decodetile=tif.tif_decodetile;
tif.tif_decodetile=PredictorDecodeTile;
}
// If the data is horizontally differenced 16-bit data that
// requires byte-swapping, then it must be byte swapped before
// the accumulation step. We do this with a special-purpose
// routine and override the normal post decoding logic that
// the library setup when the directory was read.
if((tif.tif_flags&TIF_FLAGS.TIFF_SWAB)==TIF_FLAGS.TIFF_SWAB)
{
if(sp.decodepfunc==horAcc16)
{
sp.decodepfunc=swabHorAcc16;
tif.tif_postdecode=TIFFNoPostDecode;
}
else if(sp.decodepfunc==horAcc32)
{
sp.decodepfunc=swabHorAcc32;
tif.tif_postdecode=TIFFNoPostDecode;
}
}
}
else if(sp.predictor==PREDICTOR.FLOATINGPOINT)
{
sp.decodepfunc=fpAcc;
// Override default decoding method with one that does the
// predictor stuff.
if(tif.tif_decoderow!=PredictorDecodeRow)
{
sp.decoderow=tif.tif_decoderow;
tif.tif_decoderow=PredictorDecodeRow;
sp.decodestrip=tif.tif_decodestrip;
tif.tif_decodestrip=PredictorDecodeTile;
sp.decodetile=tif.tif_decodetile;
tif.tif_decodetile=PredictorDecodeTile;
}
// The data should not be swapped outside of the floating
// point predictor, the accumulation routine should return
// byres in the native order.
if((tif.tif_flags&TIF_FLAGS.TIFF_SWAB)==TIF_FLAGS.TIFF_SWAB) tif.tif_postdecode=TIFFNoPostDecode;
// Allocate buffer to keep the decoded bytes before
// rearranging in the ight order
}
return true;
}
static bool PredictorSetupEncode(TIFF tif)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
TIFFDirectory td=tif.tif_dir;
if(!sp.setupencode(tif)||!PredictorSetup(tif)) return false;
if(sp.predictor==PREDICTOR.HORIZONTAL)
{
switch(td.td_bitspersample)
{
case 8: sp.encodepfunc=horDiff8; break;
case 16: sp.encodepfunc=horDiff16; break;
case 32: sp.encodepfunc=horDiff32; break;
}
// Override default encoding method with one that does the
// predictor stuff.
if(tif.tif_encoderow!=PredictorEncodeRow)
{
sp.encoderow=tif.tif_encoderow;
tif.tif_encoderow=PredictorEncodeRow;
sp.encodestrip=tif.tif_encodestrip;
tif.tif_encodestrip=PredictorEncodeTile;
sp.encodetile=tif.tif_encodetile;
tif.tif_encodetile=PredictorEncodeTile;
}
}
else if(sp.predictor==PREDICTOR.FLOATINGPOINT)
{
sp.encodepfunc=fpDiff;
// Override default encoding method with one that does the
// predictor stuff.
if(tif.tif_encoderow!=PredictorEncodeRow)
{
sp.encoderow=tif.tif_encoderow;
tif.tif_encoderow=PredictorEncodeRow;
sp.encodestrip=tif.tif_encodestrip;
tif.tif_encodestrip=PredictorEncodeTile;
sp.encodetile=tif.tif_encodetile;
tif.tif_encodetile=PredictorEncodeTile;
}
}
return true;
}
unsafe static void horAcc8(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
if(cc>stride)
{
fixed(byte* cp0_=cp0)
{
byte* cp=cp0_+cp0_offset;
cc-=stride;
// Pipeline the most common cases.
if(stride==3)
{
byte cr=cp[0];
byte cg=cp[1];
byte cb=cp[2];
do
{
cc-=3;
cp+=3;
cp[0]=(cr+=cp[0]);
cp[1]=(cg+=cp[1]);
cp[2]=(cb+=cp[2]);
}
while(cc>0);
}
else if(stride==4)
{
byte cr=cp[0];
byte cg=cp[1];
byte cb=cp[2];
byte ca=cp[3];
do
{
cc-=4;
cp+=4;
cp[0]=(cr+=cp[0]);
cp[1]=(cg+=cp[1]);
cp[2]=(cb+=cp[2]);
cp[3]=(ca+=cp[3]);
}
while(cc>0);
}
else
{
do
{
//was REPEAT4(stride, cp[stride]+=*(cp++))
switch(stride)
{
default: for(int i=stride-4; i>0; i--) cp[stride]+=*(cp++); goto case 4;
case 4: cp[stride]+=*(cp++); goto case 3;
case 3: cp[stride]+=*(cp++); goto case 2;
case 2: cp[stride]+=*(cp++); goto case 1;
case 1: cp[stride]+=*(cp++); break;
case 0: break;
}
cc-=stride;
}
while(cc>0);
}
}
}
}
unsafe static void swabHorAcc16(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
int wc=cc/2;
if(wc>stride)
{
fixed(byte* cp0_=cp0)
{
ushort* wp=(ushort*)(cp0_+cp0_offset);
//was TIFFSwabArrayOfShort(wp, wc);
byte* cp=cp0_;
while((wc--)>0)
{
byte t=cp[1]; cp[1]=cp[0]; cp[0]=t;
cp+=2;
}
wc-=stride;
do
{
//was REPEAT4(stride, wp[stride]+=*(wp++));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) wp[stride]+=*(wp++); goto case 4;
case 4: wp[stride]+=*(wp++); goto case 3;
case 3: wp[stride]+=*(wp++); goto case 2;
case 2: wp[stride]+=*(wp++); goto case 1;
case 1: wp[stride]+=*(wp++); break;
case 0: break;
}
wc-=stride;
}
while(wc>0);
}
}
}
unsafe static void horAcc16(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
int wc=cc/2;
if(wc>stride)
{
fixed(byte* cp0_=cp0)
{
ushort* wp=(ushort*)(cp0_+cp0_offset);
wc-=stride;
do
{
//was REPEAT4(stride, wp[stride]+=*(wp++));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) wp[stride]+=*(wp++); goto case 4;
case 4: wp[stride]+=*(wp++); goto case 3;
case 3: wp[stride]+=*(wp++); goto case 2;
case 2: wp[stride]+=*(wp++); goto case 1;
case 1: wp[stride]+=*(wp++); break;
case 0: break;
}
wc-=stride;
}
while(wc>0);
}
}
}
unsafe static void swabHorAcc32(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
int wc=cc/4;
if(wc>stride)
{
fixed(byte* cp0_=cp0)
{
ushort* wp=(ushort*)(cp0_+cp0_offset);
//was TIFFSwabArrayOfLong(wp, wc);
byte* cp=cp0_;
while((wc--)>0)
{
byte t=cp[3]; cp[3]=cp[0]; cp[0]=t;
t=cp[2]; cp[2]=cp[1]; cp[1]=t;
cp+=4;
}
wc-=stride;
do
{
//was REPEAT4(stride, wp[stride]+=*(wp++));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) wp[stride]+=*(wp++); goto case 4;
case 4: wp[stride]+=*(wp++); goto case 3;
case 3: wp[stride]+=*(wp++); goto case 2;
case 2: wp[stride]+=*(wp++); goto case 1;
case 1: wp[stride]+=*(wp++); break;
case 0: break;
}
wc-=stride;
}
while(wc>0);
}
}
}
unsafe static void horAcc32(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
int wc=cc/4;
if(wc>stride)
{
fixed(byte* cp0_=cp0)
{
ushort* wp=(ushort*)(cp0_+cp0_offset);
wc-=stride;
do
{
//was REPEAT4(stride, wp[stride]+=*(wp++));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) wp[stride]+=*(wp++); goto case 4;
case 4: wp[stride]+=*(wp++); goto case 3;
case 3: wp[stride]+=*(wp++); goto case 2;
case 2: wp[stride]+=*(wp++); goto case 1;
case 1: wp[stride]+=*(wp++); break;
case 0: break;
}
wc-=stride;
}
while(wc>0);
}
}
}
// Floating point predictor accumulation routine.
unsafe static void fpAcc(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
int bps=tif.tif_dir.td_bitspersample/8;
int wc=cc/bps;
int count=cc;
byte[] tmp=null;
try
{
tmp=new byte[cc];
}
catch
{
return;
}
fixed(byte* cp0_=cp0)
{
byte* cp=cp0_+cp0_offset;
while(count>stride)
{
//was REPEAT4(stride, cp[stride]+=*(cp++));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) cp[stride]+=*(cp++); goto case 4;
case 4: cp[stride]+=*(cp++); goto case 3;
case 3: cp[stride]+=*(cp++); goto case 2;
case 2: cp[stride]+=*(cp++); goto case 1;
case 1: cp[stride]+=*(cp++); break;
case 0: break;
}
count-=stride;
}
Array.Copy(cp0, cp0_offset, tmp, 0, cc);
cp=cp0_+cp0_offset;
for(count=0; count<wc; count++)
{
for(uint b=0; b<bps; b++) cp[bps*count+b]=tmp[(bps-b-1)*wc+count];
}
}
}
// Decode a scanline and apply the predictor routine.
static bool PredictorDecodeRow(TIFF tif, byte[] op0, int occ0, ushort s)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
if(sp.decoderow(tif, op0, occ0, s))
{
sp.decodepfunc(tif, op0, 0, occ0);
return true;
}
return false;
}
// Decode a tile/strip and apply the predictor routine.
// Note that horizontal differencing must be done on a
// row-by-row basis. The width of a "row" has already
// been calculated at pre-decode time according to the
// strip/tile dimensions.
static bool PredictorDecodeTile(TIFF tif, byte[] op0, int occ0, ushort s)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
if(sp.decodetile(tif, op0, occ0, s))
{
int rowsize=sp.rowsize;
#if DEBUG
if(rowsize<=0) throw new Exception("rowsize<=0");
#endif
int op0_offset=0;
while(occ0>0)
{
sp.decodepfunc(tif, op0, op0_offset, rowsize);
occ0-=rowsize;
op0_offset+=rowsize;
}
return true;
}
return false;
}
unsafe static void horDiff8(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
int stride=sp.stride;
if(cc>stride)
{
fixed(byte* cp0_=cp0)
{
byte* cp=cp0_+cp0_offset;
cc-=stride;
// Pipeline the most common cases.
if(stride==3)
{
byte r1, g1, b1;
byte r2=cp[0];
byte g2=cp[1];
byte b2=cp[2];
do
{
r1=cp[3]; cp[3]-=r2; r2=r1;
g1=cp[4]; cp[4]-=g2; g2=g1;
b1=cp[5]; cp[5]-=b2; b2=b1;
cp+=3;
cc-=3;
}
while(cc>0);
}
else if(stride==4)
{
byte r1, g1, b1, a1;
byte r2=cp[0];
byte g2=cp[1];
byte b2=cp[2];
byte a2=cp[3];
do
{
r1=cp[4]; cp[4]-=r2; r2=r1;
g1=cp[5]; cp[5]-=g2; g2=g1;
b1=cp[6]; cp[6]-=b2; b2=b1;
a1=cp[7]; cp[7]-=a2; a2=a1;
cp+=4;
cc-=4;
}
while(cc>0);
}
else
{
cp+=cc-1;
do
{
//was REPEAT4(stride, cp[stride]-=*(cp--));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) cp[stride]-=*(cp--); goto case 4;
case 4: cp[stride]-=*(cp--); goto case 3;
case 3: cp[stride]-=*(cp--); goto case 2;
case 2: cp[stride]-=*(cp--); goto case 1;
case 1: cp[stride]-=*(cp--); break;
case 0: break;
}
cc-=stride;
}
while(cc>0);
}
}
}
}
unsafe static void horDiff16(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
int stride=sp.stride;
int wc=cc/2;
if(wc>stride)
{
fixed(byte* cp0_=cp0)
{
ushort* wp=(ushort*)(cp0_+cp0_offset);
wc-=stride;
wp+=wc-1;
do
{
//was REPEAT4(stride, wp[stride]-=*(wp--));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) wp[stride]-=*(wp--); goto case 4;
case 4: wp[stride]-=*(wp--); goto case 3;
case 3: wp[stride]-=*(wp--); goto case 2;
case 2: wp[stride]-=*(wp--); goto case 1;
case 1: wp[stride]-=*(wp--); break;
case 0: break;
}
wc-=stride;
}
while(wc>0);
}
}
}
unsafe static void horDiff32(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
int stride=sp.stride;
int wc=cc/4;
if(wc>stride)
{
fixed(byte* cp0_=cp0)
{
ushort* wp=(ushort*)(cp0_+cp0_offset);
wc-=stride;
wp+=wc-1;
do
{
//was REPEAT4(stride, wp[stride]-=*(wp--));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) wp[stride]-=*(wp--); goto case 4;
case 4: wp[stride]-=*(wp--); goto case 3;
case 3: wp[stride]-=*(wp--); goto case 2;
case 2: wp[stride]-=*(wp--); goto case 1;
case 1: wp[stride]-=*(wp--); break;
case 0: break;
}
wc-=stride;
}
while(wc>0);
}
}
}
// Floating point predictor differencing routine.
unsafe static void fpDiff(TIFF tif, byte[] cp0, int cp0_offset, int cc)
{
int stride=((TIFFPredictorState)tif.tif_data).stride;
int bps=tif.tif_dir.td_bitspersample/8;
int wc=cc/bps;
int count;
byte[] tmp=null;
try
{
tmp=new byte[cc];
}
catch
{
return;
}
Array.Copy(cp0, cp0_offset, tmp, 0, cc);
fixed(byte* cp0_=cp0)
{
byte* cp=cp0_+cp0_offset;
for(count=0; count<wc; count++)
{
for(int b=0; b<bps; b++)
{
cp[(bps-b-1)*wc+count]=tmp[bps*count+b];
}
}
tmp=null;
cp=cp0_+cp0_offset;
cp+=cc-stride-1;
for(count=cc; count>stride; count-=stride)
{
//was REPEAT4(stride, cp[stride]-=*(cp--));
switch(stride)
{
default: for(int i=stride-4; i>0; i--) cp[stride]-=*(cp--); goto case 4;
case 4: cp[stride]-=*(cp--); goto case 3;
case 3: cp[stride]-=*(cp--); goto case 2;
case 2: cp[stride]-=*(cp--); goto case 1;
case 1: cp[stride]-=*(cp--); break;
case 0: break;
}
}
}
}
static bool PredictorEncodeRow(TIFF tif, byte[] bp, int cc, ushort s)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
// XXX horizontal differencing alters user's data XXX
sp.encodepfunc(tif, bp, 0, cc);
return sp.encoderow(tif, bp, cc, s);
}
static bool PredictorEncodeTile(TIFF tif, byte[] bp0, int cc0, ushort s)
{
string module="PredictorEncodeTile";
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
int cc=cc0;
byte[] bp=null;
try
{
bp=new byte[cc0];
}
catch
{
TIFFErrorExt(tif.tif_clientdata, module, "Out of memory allocating {0} byte temp buffer.", cc0);
return false;
}
bp0.CopyTo(bp, 0);
int rowsize=sp.rowsize;
#if DEBUG
if(rowsize<=0) throw new Exception("rowsize<=0");
if((cc0%rowsize)!=0) throw new Exception("(cc0%rowsize)!=0");
#endif
int bp_offset=0;
while(cc>0)
{
sp.encodepfunc(tif, bp, bp_offset, rowsize);
cc-=rowsize;
bp_offset+=rowsize;
}
return sp.encodetile(tif, bp, cc0, s);
}
static readonly TIFFFieldInfo predictFieldInfo=new TIFFFieldInfo(TIFFTAG.PREDICTOR, 1, 1, TIFFDataType.TIFF_SHORT, FIELD.CODEC, false, false, "Predictor");
static bool PredictorVSetField(TIFF tif, TIFFTAG tag, TIFFDataType dt, params object[] ap)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
switch(tag)
{
case TIFFTAG.PREDICTOR:
sp.predictor=(PREDICTOR)__GetAsUshort(ap, 0);
TIFFSetFieldBit(tif, FIELD.CODEC);
break;
default: return sp.vsetparent(tif, tag, dt, ap);
}
tif.tif_flags|=TIF_FLAGS.TIFF_DIRTYDIRECT;
return true;
}
static bool PredictorVGetField(TIFF tif, TIFFTAG tag, object[] ap)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
switch(tag)
{
case TIFFTAG.PREDICTOR:
ap[0]=(ushort)sp.predictor;
break;
default: return sp.vgetparent(tif, tag, ap);
}
return true;
}
static void PredictorPrintDir(TIFF tif, TextWriter fd, TIFFPRINT flags)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
if(TIFFFieldSet(tif, FIELD.CODEC))
{
fd.Write(" Predictor: ");
switch(sp.predictor)
{
case PREDICTOR.NONE: fd.Write("none "); break;
case PREDICTOR.HORIZONTAL: fd.Write("horizontal differencing "); break;
case PREDICTOR.FLOATINGPOINT: fd.Write("floating point predictor "); break;
}
fd.WriteLine("{0} (0x{1:X2})\n", sp.predictor, sp.predictor);
}
if(sp.printdir!=null) sp.printdir(tif, fd, flags);
}
static bool TIFFPredictorInit(TIFF tif)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
// Merge codec-specific tag information.
if(!_TIFFMergeFieldInfo(tif, predictFieldInfo))
{
TIFFErrorExt(tif.tif_clientdata, "TIFFPredictorInit", "Merging Predictor codec-specific tags failed");
return false;
}
// Override parent get/set field methods.
sp.vgetparent=tif.tif_tagmethods.vgetfield;
tif.tif_tagmethods.vgetfield=PredictorVGetField; // hook for predictor tag
sp.vsetparent=tif.tif_tagmethods.vsetfield;
tif.tif_tagmethods.vsetfield=PredictorVSetField; // hook for predictor tag
sp.printdir=tif.tif_tagmethods.printdir;
tif.tif_tagmethods.printdir=PredictorPrintDir; // hook for predictor tag
sp.setupdecode=tif.tif_setupdecode;
tif.tif_setupdecode=PredictorSetupDecode;
sp.setupencode=tif.tif_setupencode;
tif.tif_setupencode=PredictorSetupEncode;
sp.predictor=PREDICTOR.NONE; // default value
sp.encodepfunc=null; // no predictor routine
sp.decodepfunc=null; // no predictor routine
return true;
}
static bool TIFFPredictorCleanup(TIFF tif)
{
TIFFPredictorState sp=(TIFFPredictorState)tif.tif_data;
tif.tif_tagmethods.vgetfield=sp.vgetparent;
tif.tif_tagmethods.vsetfield=sp.vsetparent;
tif.tif_tagmethods.printdir=sp.printdir;
tif.tif_setupdecode=sp.setupdecode;
tif.tif_setupencode=sp.setupencode;
return true;
}
}
}