765 lines
19 KiB
C
765 lines
19 KiB
C
/* $Id: tif_predict.c,v 1.32 2010-03-10 18:56:49 bfriesen Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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*
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* Predictor Tag Support (used by multiple codecs).
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*/
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#include "tiffiop.h"
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#include "tif_predict.h"
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#define PredictorState(tif) ((TIFFPredictorState*) (tif)->tif_data)
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static void horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void horAcc32(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc);
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static void fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc);
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static int PredictorDecodeRow(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s);
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static int PredictorDecodeTile(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s);
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static int PredictorEncodeRow(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);
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static int PredictorEncodeTile(TIFF* tif, uint8* bp0, tmsize_t cc0, uint16 s);
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static int
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PredictorSetup(TIFF* tif)
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{
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static const char module[] = "PredictorSetup";
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TIFFPredictorState* sp = PredictorState(tif);
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TIFFDirectory* td = &tif->tif_dir;
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switch (sp->predictor) /* no differencing */
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{
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case PREDICTOR_NONE:
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return 1;
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case PREDICTOR_HORIZONTAL:
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if (td->td_bitspersample != 8
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&& td->td_bitspersample != 16
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&& td->td_bitspersample != 32) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"Horizontal differencing \"Predictor\" not supported with %d-bit samples",
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td->td_bitspersample);
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return 0;
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}
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break;
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case PREDICTOR_FLOATINGPOINT:
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if (td->td_sampleformat != SAMPLEFORMAT_IEEEFP) {
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TIFFErrorExt(tif->tif_clientdata, module,
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"Floating point \"Predictor\" not supported with %d data format",
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td->td_sampleformat);
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return 0;
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}
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break;
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default:
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TIFFErrorExt(tif->tif_clientdata, module,
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"\"Predictor\" value %d not supported",
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sp->predictor);
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return 0;
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}
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sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
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td->td_samplesperpixel : 1);
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/*
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* Calculate the scanline/tile-width size in bytes.
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*/
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if (isTiled(tif))
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sp->rowsize = TIFFTileRowSize(tif);
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else
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sp->rowsize = TIFFScanlineSize(tif);
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if (sp->rowsize == 0)
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return 0;
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return 1;
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}
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static int
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PredictorSetupDecode(TIFF* tif)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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TIFFDirectory* td = &tif->tif_dir;
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if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
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return 0;
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if (sp->predictor == 2) {
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switch (td->td_bitspersample) {
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case 8: sp->decodepfunc = horAcc8; break;
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case 16: sp->decodepfunc = horAcc16; break;
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case 32: sp->decodepfunc = horAcc32; break;
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}
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/*
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* Override default decoding method with one that does the
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* predictor stuff.
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*/
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if( tif->tif_decoderow != PredictorDecodeRow )
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{
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sp->decoderow = tif->tif_decoderow;
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tif->tif_decoderow = PredictorDecodeRow;
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sp->decodestrip = tif->tif_decodestrip;
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tif->tif_decodestrip = PredictorDecodeTile;
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sp->decodetile = tif->tif_decodetile;
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tif->tif_decodetile = PredictorDecodeTile;
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}
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/*
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* If the data is horizontally differenced 16-bit data that
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* requires byte-swapping, then it must be byte swapped before
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* the accumulation step. We do this with a special-purpose
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* routine and override the normal post decoding logic that
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* the library setup when the directory was read.
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*/
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if (tif->tif_flags & TIFF_SWAB) {
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if (sp->decodepfunc == horAcc16) {
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sp->decodepfunc = swabHorAcc16;
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tif->tif_postdecode = _TIFFNoPostDecode;
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} else if (sp->decodepfunc == horAcc32) {
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sp->decodepfunc = swabHorAcc32;
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tif->tif_postdecode = _TIFFNoPostDecode;
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}
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}
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}
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else if (sp->predictor == 3) {
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sp->decodepfunc = fpAcc;
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/*
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* Override default decoding method with one that does the
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* predictor stuff.
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*/
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if( tif->tif_decoderow != PredictorDecodeRow )
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{
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sp->decoderow = tif->tif_decoderow;
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tif->tif_decoderow = PredictorDecodeRow;
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sp->decodestrip = tif->tif_decodestrip;
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tif->tif_decodestrip = PredictorDecodeTile;
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sp->decodetile = tif->tif_decodetile;
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tif->tif_decodetile = PredictorDecodeTile;
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}
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/*
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* The data should not be swapped outside of the floating
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* point predictor, the accumulation routine should return
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* byres in the native order.
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*/
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if (tif->tif_flags & TIFF_SWAB) {
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tif->tif_postdecode = _TIFFNoPostDecode;
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}
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/*
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* Allocate buffer to keep the decoded bytes before
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* rearranging in the ight order
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*/
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}
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return 1;
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}
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static int
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PredictorSetupEncode(TIFF* tif)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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TIFFDirectory* td = &tif->tif_dir;
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if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
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return 0;
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if (sp->predictor == 2) {
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switch (td->td_bitspersample) {
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case 8: sp->encodepfunc = horDiff8; break;
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case 16: sp->encodepfunc = horDiff16; break;
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case 32: sp->encodepfunc = horDiff32; break;
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}
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/*
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* Override default encoding method with one that does the
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* predictor stuff.
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*/
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if( tif->tif_encoderow != PredictorEncodeRow )
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{
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sp->encoderow = tif->tif_encoderow;
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tif->tif_encoderow = PredictorEncodeRow;
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sp->encodestrip = tif->tif_encodestrip;
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tif->tif_encodestrip = PredictorEncodeTile;
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sp->encodetile = tif->tif_encodetile;
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tif->tif_encodetile = PredictorEncodeTile;
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}
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}
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else if (sp->predictor == 3) {
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sp->encodepfunc = fpDiff;
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/*
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* Override default encoding method with one that does the
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* predictor stuff.
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*/
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if( tif->tif_encoderow != PredictorEncodeRow )
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{
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sp->encoderow = tif->tif_encoderow;
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tif->tif_encoderow = PredictorEncodeRow;
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sp->encodestrip = tif->tif_encodestrip;
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tif->tif_encodestrip = PredictorEncodeTile;
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sp->encodetile = tif->tif_encodetile;
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tif->tif_encodetile = PredictorEncodeTile;
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}
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}
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return 1;
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}
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#define REPEAT4(n, op) \
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switch (n) { \
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default: { tmsize_t i; for (i = n-4; i > 0; i--) { op; } } \
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case 4: op; \
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case 3: op; \
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case 2: op; \
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case 1: op; \
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case 0: ; \
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}
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static void
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horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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tmsize_t stride = PredictorState(tif)->stride;
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char* cp = (char*) cp0;
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assert((cc%stride)==0);
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if (cc > stride) {
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/*
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* Pipeline the most common cases.
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*/
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if (stride == 3) {
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unsigned int cr = cp[0];
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unsigned int cg = cp[1];
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unsigned int cb = cp[2];
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cc -= 3;
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cp += 3;
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while (cc>0) {
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cp[0] = (char) (cr += cp[0]);
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cp[1] = (char) (cg += cp[1]);
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cp[2] = (char) (cb += cp[2]);
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cc -= 3;
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cp += 3;
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}
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} else if (stride == 4) {
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unsigned int cr = cp[0];
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unsigned int cg = cp[1];
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unsigned int cb = cp[2];
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unsigned int ca = cp[3];
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cc -= 4;
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cp += 4;
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while (cc>0) {
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cp[0] = (char) (cr += cp[0]);
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cp[1] = (char) (cg += cp[1]);
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cp[2] = (char) (cb += cp[2]);
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cp[3] = (char) (ca += cp[3]);
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cc -= 4;
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cp += 4;
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}
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} else {
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cc -= stride;
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do {
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REPEAT4(stride, cp[stride] =
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(char) (cp[stride] + *cp); cp++)
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cc -= stride;
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} while (cc>0);
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}
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}
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}
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static void
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swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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tmsize_t stride = PredictorState(tif)->stride;
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uint16* wp = (uint16*) cp0;
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tmsize_t wc = cc / 2;
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assert((cc%(2*stride))==0);
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if (wc > stride) {
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TIFFSwabArrayOfShort(wp, wc);
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wc -= stride;
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do {
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REPEAT4(stride, wp[stride] += wp[0]; wp++)
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wc -= stride;
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} while (wc > 0);
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}
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}
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static void
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horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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tmsize_t stride = PredictorState(tif)->stride;
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uint16* wp = (uint16*) cp0;
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tmsize_t wc = cc / 2;
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assert((cc%(2*stride))==0);
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if (wc > stride) {
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wc -= stride;
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do {
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REPEAT4(stride, wp[stride] += wp[0]; wp++)
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wc -= stride;
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} while (wc > 0);
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}
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}
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static void
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swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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tmsize_t stride = PredictorState(tif)->stride;
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uint32* wp = (uint32*) cp0;
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tmsize_t wc = cc / 4;
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assert((cc%(4*stride))==0);
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if (wc > stride) {
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TIFFSwabArrayOfLong(wp, wc);
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wc -= stride;
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do {
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REPEAT4(stride, wp[stride] += wp[0]; wp++)
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wc -= stride;
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} while (wc > 0);
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}
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}
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static void
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horAcc32(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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tmsize_t stride = PredictorState(tif)->stride;
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uint32* wp = (uint32*) cp0;
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tmsize_t wc = cc / 4;
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assert((cc%(4*stride))==0);
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if (wc > stride) {
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wc -= stride;
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do {
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REPEAT4(stride, wp[stride] += wp[0]; wp++)
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wc -= stride;
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} while (wc > 0);
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}
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}
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/*
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* Floating point predictor accumulation routine.
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*/
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static void
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fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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tmsize_t stride = PredictorState(tif)->stride;
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uint32 bps = tif->tif_dir.td_bitspersample / 8;
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tmsize_t wc = cc / bps;
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tmsize_t count = cc;
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uint8 *cp = (uint8 *) cp0;
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uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
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assert((cc%(bps*stride))==0);
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if (!tmp)
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return;
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while (count > stride) {
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REPEAT4(stride, cp[stride] += cp[0]; cp++)
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count -= stride;
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}
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_TIFFmemcpy(tmp, cp0, cc);
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cp = (uint8 *) cp0;
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for (count = 0; count < wc; count++) {
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uint32 byte;
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for (byte = 0; byte < bps; byte++) {
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#if WORDS_BIGENDIAN
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cp[bps * count + byte] = tmp[byte * wc + count];
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#else
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cp[bps * count + byte] =
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tmp[(bps - byte - 1) * wc + count];
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#endif
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}
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}
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_TIFFfree(tmp);
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}
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/*
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* Decode a scanline and apply the predictor routine.
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*/
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static int
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PredictorDecodeRow(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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assert(sp != NULL);
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assert(sp->decoderow != NULL);
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assert(sp->decodepfunc != NULL);
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if ((*sp->decoderow)(tif, op0, occ0, s)) {
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(*sp->decodepfunc)(tif, op0, occ0);
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return 1;
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} else
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return 0;
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}
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/*
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* Decode a tile/strip and apply the predictor routine.
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* Note that horizontal differencing must be done on a
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* row-by-row basis. The width of a "row" has already
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* been calculated at pre-decode time according to the
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* strip/tile dimensions.
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*/
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static int
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PredictorDecodeTile(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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assert(sp != NULL);
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assert(sp->decodetile != NULL);
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if ((*sp->decodetile)(tif, op0, occ0, s)) {
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tmsize_t rowsize = sp->rowsize;
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assert(rowsize > 0);
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assert((occ0%rowsize)==0);
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assert(sp->decodepfunc != NULL);
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while (occ0 > 0) {
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(*sp->decodepfunc)(tif, op0, rowsize);
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occ0 -= rowsize;
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op0 += rowsize;
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}
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return 1;
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} else
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return 0;
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}
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static void
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horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tmsize_t stride = sp->stride;
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char* cp = (char*) cp0;
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assert((cc%stride)==0);
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if (cc > stride) {
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cc -= stride;
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/*
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* Pipeline the most common cases.
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*/
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if (stride == 3) {
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int r1, g1, b1;
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int r2 = cp[0];
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int g2 = cp[1];
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int b2 = cp[2];
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do {
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r1 = cp[3]; cp[3] = r1-r2; r2 = r1;
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g1 = cp[4]; cp[4] = g1-g2; g2 = g1;
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b1 = cp[5]; cp[5] = b1-b2; b2 = b1;
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cp += 3;
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} while ((cc -= 3) > 0);
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} else if (stride == 4) {
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int r1, g1, b1, a1;
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int r2 = cp[0];
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int g2 = cp[1];
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int b2 = cp[2];
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int a2 = cp[3];
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do {
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r1 = cp[4]; cp[4] = r1-r2; r2 = r1;
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g1 = cp[5]; cp[5] = g1-g2; g2 = g1;
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b1 = cp[6]; cp[6] = b1-b2; b2 = b1;
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a1 = cp[7]; cp[7] = a1-a2; a2 = a1;
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cp += 4;
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} while ((cc -= 4) > 0);
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} else {
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cp += cc - 1;
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do {
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REPEAT4(stride, cp[stride] -= cp[0]; cp--)
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} while ((cc -= stride) > 0);
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}
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}
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}
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static void
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horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tmsize_t stride = sp->stride;
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int16 *wp = (int16*) cp0;
|
|
tmsize_t wc = cc/2;
|
|
|
|
assert((cc%(2*stride))==0);
|
|
|
|
if (wc > stride) {
|
|
wc -= stride;
|
|
wp += wc - 1;
|
|
do {
|
|
REPEAT4(stride, wp[stride] -= wp[0]; wp--)
|
|
wc -= stride;
|
|
} while (wc > 0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc)
|
|
{
|
|
TIFFPredictorState* sp = PredictorState(tif);
|
|
tmsize_t stride = sp->stride;
|
|
int32 *wp = (int32*) cp0;
|
|
tmsize_t wc = cc/4;
|
|
|
|
assert((cc%(4*stride))==0);
|
|
|
|
if (wc > stride) {
|
|
wc -= stride;
|
|
wp += wc - 1;
|
|
do {
|
|
REPEAT4(stride, wp[stride] -= wp[0]; wp--)
|
|
wc -= stride;
|
|
} while (wc > 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Floating point predictor differencing routine.
|
|
*/
|
|
static void
|
|
fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc)
|
|
{
|
|
tmsize_t stride = PredictorState(tif)->stride;
|
|
uint32 bps = tif->tif_dir.td_bitspersample / 8;
|
|
tmsize_t wc = cc / bps;
|
|
tmsize_t count;
|
|
uint8 *cp = (uint8 *) cp0;
|
|
uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
|
|
|
|
assert((cc%(bps*stride))==0);
|
|
|
|
if (!tmp)
|
|
return;
|
|
|
|
_TIFFmemcpy(tmp, cp0, cc);
|
|
for (count = 0; count < wc; count++) {
|
|
uint32 byte;
|
|
for (byte = 0; byte < bps; byte++) {
|
|
#if WORDS_BIGENDIAN
|
|
cp[byte * wc + count] = tmp[bps * count + byte];
|
|
#else
|
|
cp[(bps - byte - 1) * wc + count] =
|
|
tmp[bps * count + byte];
|
|
#endif
|
|
}
|
|
}
|
|
_TIFFfree(tmp);
|
|
|
|
cp = (uint8 *) cp0;
|
|
cp += cc - stride - 1;
|
|
for (count = cc; count > stride; count -= stride)
|
|
REPEAT4(stride, cp[stride] -= cp[0]; cp--)
|
|
}
|
|
|
|
static int
|
|
PredictorEncodeRow(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
|
|
{
|
|
TIFFPredictorState *sp = PredictorState(tif);
|
|
|
|
assert(sp != NULL);
|
|
assert(sp->encodepfunc != NULL);
|
|
assert(sp->encoderow != NULL);
|
|
|
|
/* XXX horizontal differencing alters user's data XXX */
|
|
(*sp->encodepfunc)(tif, bp, cc);
|
|
return (*sp->encoderow)(tif, bp, cc, s);
|
|
}
|
|
|
|
static int
|
|
PredictorEncodeTile(TIFF* tif, uint8* bp0, tmsize_t cc0, uint16 s)
|
|
{
|
|
static const char module[] = "PredictorEncodeTile";
|
|
TIFFPredictorState *sp = PredictorState(tif);
|
|
uint8 *working_copy;
|
|
tmsize_t cc = cc0, rowsize;
|
|
unsigned char* bp;
|
|
int result_code;
|
|
|
|
assert(sp != NULL);
|
|
assert(sp->encodepfunc != NULL);
|
|
assert(sp->encodetile != NULL);
|
|
|
|
/*
|
|
* Do predictor manipulation in a working buffer to avoid altering
|
|
* the callers buffer. http://trac.osgeo.org/gdal/ticket/1965
|
|
*/
|
|
working_copy = (uint8*) _TIFFmalloc(cc0);
|
|
if( working_copy == NULL )
|
|
{
|
|
TIFFErrorExt(tif->tif_clientdata, module,
|
|
"Out of memory allocating " TIFF_SSIZE_FORMAT " byte temp buffer.",
|
|
cc0 );
|
|
return 0;
|
|
}
|
|
memcpy( working_copy, bp0, cc0 );
|
|
bp = working_copy;
|
|
|
|
rowsize = sp->rowsize;
|
|
assert(rowsize > 0);
|
|
assert((cc0%rowsize)==0);
|
|
while (cc > 0) {
|
|
(*sp->encodepfunc)(tif, bp, rowsize);
|
|
cc -= rowsize;
|
|
bp += rowsize;
|
|
}
|
|
result_code = (*sp->encodetile)(tif, working_copy, cc0, s);
|
|
|
|
_TIFFfree( working_copy );
|
|
|
|
return result_code;
|
|
}
|
|
|
|
#define FIELD_PREDICTOR (FIELD_CODEC+0) /* XXX */
|
|
|
|
static const TIFFField predictFields[] = {
|
|
{ TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, TIFF_SETGET_UINT16, FIELD_PREDICTOR, FALSE, FALSE, "Predictor", NULL },
|
|
};
|
|
|
|
static int
|
|
PredictorVSetField(TIFF* tif, uint32 tag, va_list ap)
|
|
{
|
|
TIFFPredictorState *sp = PredictorState(tif);
|
|
|
|
assert(sp != NULL);
|
|
assert(sp->vsetparent != NULL);
|
|
|
|
switch (tag) {
|
|
case TIFFTAG_PREDICTOR:
|
|
sp->predictor = (uint16) va_arg(ap, uint16_vap);
|
|
TIFFSetFieldBit(tif, FIELD_PREDICTOR);
|
|
break;
|
|
default:
|
|
return (*sp->vsetparent)(tif, tag, ap);
|
|
}
|
|
tif->tif_flags |= TIFF_DIRTYDIRECT;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
PredictorVGetField(TIFF* tif, uint32 tag, va_list ap)
|
|
{
|
|
TIFFPredictorState *sp = PredictorState(tif);
|
|
|
|
assert(sp != NULL);
|
|
assert(sp->vgetparent != NULL);
|
|
|
|
switch (tag) {
|
|
case TIFFTAG_PREDICTOR:
|
|
*va_arg(ap, uint16*) = sp->predictor;
|
|
break;
|
|
default:
|
|
return (*sp->vgetparent)(tif, tag, ap);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
PredictorPrintDir(TIFF* tif, FILE* fd, long flags)
|
|
{
|
|
TIFFPredictorState* sp = PredictorState(tif);
|
|
|
|
(void) flags;
|
|
if (TIFFFieldSet(tif,FIELD_PREDICTOR)) {
|
|
fprintf(fd, " Predictor: ");
|
|
switch (sp->predictor) {
|
|
case 1: fprintf(fd, "none "); break;
|
|
case 2: fprintf(fd, "horizontal differencing "); break;
|
|
case 3: fprintf(fd, "floating point predictor "); break;
|
|
}
|
|
fprintf(fd, "%u (0x%x)\n", sp->predictor, sp->predictor);
|
|
}
|
|
if (sp->printdir)
|
|
(*sp->printdir)(tif, fd, flags);
|
|
}
|
|
|
|
int
|
|
TIFFPredictorInit(TIFF* tif)
|
|
{
|
|
TIFFPredictorState* sp = PredictorState(tif);
|
|
|
|
assert(sp != 0);
|
|
|
|
/*
|
|
* Merge codec-specific tag information.
|
|
*/
|
|
if (!_TIFFMergeFields(tif, predictFields,
|
|
TIFFArrayCount(predictFields))) {
|
|
TIFFErrorExt(tif->tif_clientdata, "TIFFPredictorInit",
|
|
"Merging Predictor codec-specific tags failed");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 = 1; /* default value */
|
|
sp->encodepfunc = NULL; /* no predictor routine */
|
|
sp->decodepfunc = NULL; /* no predictor routine */
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
TIFFPredictorCleanup(TIFF* tif)
|
|
{
|
|
TIFFPredictorState* sp = PredictorState(tif);
|
|
|
|
assert(sp != 0);
|
|
|
|
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 1;
|
|
}
|
|
|
|
/* vim: set ts=8 sts=8 sw=8 noet: */
|
|
/*
|
|
* Local Variables:
|
|
* mode: c
|
|
* c-basic-offset: 8
|
|
* fill-column: 78
|
|
* End:
|
|
*/
|