3bf951f42c
Files correlati : pdflib Ricompilazione Demo : [ ] Commento : Aggiornata pdflib.dll alla versione 7.0.4 git-svn-id: svn://10.65.10.50/trunk@18580 c028cbd2-c16b-5b4b-a496-9718f37d4682
605 lines
15 KiB
C
Executable File
605 lines
15 KiB
C
Executable File
/* PDFlib GmbH cvsid:
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* $Id: tif_predict.c,v 1.4 2009-03-23 08:55:57 guy 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*, tidata_t, tsize_t);
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static void horAcc16(TIFF*, tidata_t, tsize_t);
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static void swabHorAcc16(TIFF*, tidata_t, tsize_t);
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static void horDiff8(TIFF*, tidata_t, tsize_t);
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static void horDiff16(TIFF*, tidata_t, tsize_t);
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static void fpAcc(TIFF*, tidata_t, tsize_t);
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static void fpDiff(TIFF*, tidata_t, tsize_t);
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static int PredictorDecodeRow(TIFF*, tidata_t, tsize_t, tsample_t);
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static int PredictorDecodeTile(TIFF*, tidata_t, tsize_t, tsample_t);
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static int PredictorEncodeRow(TIFF*, tidata_t, tsize_t, tsample_t);
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static int PredictorEncodeTile(TIFF*, tidata_t, tsize_t, tsample_t);
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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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_TIFFError(tif, 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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_TIFFError(tif, 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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_TIFFError(tif, 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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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->pfunc = horAcc8; break;
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case 16: sp->pfunc = horAcc16; 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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sp->coderow = tif->tif_decoderow;
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tif->tif_decoderow = PredictorDecodeRow;
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sp->codestrip = tif->tif_decodestrip;
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tif->tif_decodestrip = PredictorDecodeTile;
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sp->codetile = tif->tif_decodetile;
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tif->tif_decodetile = PredictorDecodeTile;
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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->pfunc == horAcc16) {
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sp->pfunc = swabHorAcc16;
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tif->tif_postdecode = _TIFFNoPostDecode;
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} /* else handle 32-bit case... */
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}
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}
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else if (sp->predictor == 3) {
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sp->pfunc = 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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sp->coderow = tif->tif_decoderow;
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tif->tif_decoderow = PredictorDecodeRow;
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sp->codestrip = tif->tif_decodestrip;
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tif->tif_decodestrip = PredictorDecodeTile;
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sp->codetile = tif->tif_decodetile;
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tif->tif_decodetile = PredictorDecodeTile;
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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->pfunc = horDiff8; break;
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case 16: sp->pfunc = horDiff16; 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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sp->coderow = tif->tif_encoderow;
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tif->tif_encoderow = PredictorEncodeRow;
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sp->codestrip = tif->tif_encodestrip;
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tif->tif_encodestrip = PredictorEncodeTile;
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sp->codetile = tif->tif_encodetile;
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tif->tif_encodetile = PredictorEncodeTile;
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}
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else if (sp->predictor == 3) {
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sp->pfunc = 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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sp->coderow = tif->tif_encoderow;
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tif->tif_encoderow = PredictorEncodeRow;
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sp->codestrip = tif->tif_encodestrip;
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tif->tif_encodestrip = PredictorEncodeTile;
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sp->codetile = tif->tif_encodetile;
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tif->tif_encodetile = PredictorEncodeTile;
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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: { int 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, tidata_t cp0, tsize_t cc)
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{
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tsize_t stride = PredictorState(tif)->stride;
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char* cp = (char*) cp0;
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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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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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do {
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cc -= 3, cp += 3;
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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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} while ((int32) cc > 0);
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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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do {
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cc -= 4, cp += 4;
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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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} while ((int32) cc > 0);
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} else {
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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 ((int32) 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, tidata_t cp0, tsize_t cc)
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{
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tsize_t stride = PredictorState(tif)->stride;
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uint16* wp = (uint16*) cp0;
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tsize_t wc = cc / 2;
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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 ((int32) wc > 0);
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}
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}
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static void
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horAcc16(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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tsize_t stride = PredictorState(tif)->stride;
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uint16* wp = (uint16*) cp0;
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tsize_t wc = cc / 2;
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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 ((int32) 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, tidata_t cp0, tsize_t cc)
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{
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tsize_t stride = PredictorState(tif)->stride;
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uint32 bps = tif->tif_dir.td_bitspersample / 8;
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tsize_t wc = cc / bps;
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tsize_t count = cc;
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uint8 *cp = (uint8 *) cp0;
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uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
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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 (PDC_ISBIGENDIAN) {
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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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}
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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, tidata_t op0, tsize_t occ0, tsample_t 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->coderow != NULL);
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assert(sp->pfunc != NULL);
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if ((*sp->coderow)(tif, op0, occ0, s)) {
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(*sp->pfunc)(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, tidata_t op0, tsize_t occ0, tsample_t 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->codetile != NULL);
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if ((*sp->codetile)(tif, op0, occ0, s)) {
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tsize_t rowsize = sp->rowsize;
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assert(rowsize > 0);
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assert(sp->pfunc != NULL);
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while ((long)occ0 > 0) {
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(*sp->pfunc)(tif, op0, (tsize_t) 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, tidata_t cp0, tsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tsize_t stride = sp->stride;
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char* cp = (char*) cp0;
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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 ((int32)(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 ((int32)(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 ((int32)(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, tidata_t cp0, tsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tsize_t stride = sp->stride;
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int16 *wp = (int16*) cp0;
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tsize_t wc = cc/2;
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if (wc > stride) {
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wc -= stride;
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wp += wc - 1;
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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 ((int32) wc > 0);
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}
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}
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/*
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* Floating point predictor differencing routine.
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*/
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static void
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fpDiff(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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tsize_t stride = PredictorState(tif)->stride;
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uint32 bps = tif->tif_dir.td_bitspersample / 8;
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tsize_t wc = cc / bps;
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tsize_t count;
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uint8 *cp = (uint8 *) cp0;
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uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
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if (!tmp)
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return;
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_TIFFmemcpy(tmp, cp0, cc);
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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 (PDC_ISBIGENDIAN) {
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cp[byte * wc + count] = tmp[bps * count + byte];
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} else {
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cp[(bps - byte - 1) * wc + count] =
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tmp[bps * count + byte];
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}
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}
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}
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_TIFFfree(tmp);
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cp = (uint8 *) cp0;
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cp += cc - stride - 1;
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for (count = cc; count > stride; count -= stride)
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REPEAT4(stride, cp[stride] -= cp[0]; cp--)
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}
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static int
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PredictorEncodeRow(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t 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->pfunc != NULL);
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assert(sp->coderow != NULL);
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/* XXX horizontal differencing alters user's data XXX */
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(*sp->pfunc)(tif, bp, cc);
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return (*sp->coderow)(tif, bp, cc, s);
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}
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static int
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PredictorEncodeTile(TIFF* tif, tidata_t bp0, tsize_t cc0, tsample_t s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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tsize_t cc = cc0, rowsize;
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unsigned char* bp = bp0;
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assert(sp != NULL);
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assert(sp->pfunc != NULL);
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assert(sp->codetile != NULL);
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rowsize = sp->rowsize;
|
|
assert(rowsize > 0);
|
|
while ((long)cc > 0) {
|
|
(*sp->pfunc)(tif, bp, (tsize_t) rowsize);
|
|
cc -= rowsize;
|
|
bp += rowsize;
|
|
}
|
|
return (*sp->codetile)(tif, bp0, cc0, s);
|
|
}
|
|
|
|
#define FIELD_PREDICTOR (FIELD_CODEC+0) /* XXX */
|
|
|
|
static const TIFFFieldInfo predictFieldInfo[] = {
|
|
{ TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, FIELD_PREDICTOR,
|
|
FALSE, FALSE, "Predictor" },
|
|
};
|
|
#define N(a) (sizeof (a) / sizeof (a[0]))
|
|
|
|
static int
|
|
PredictorVSetField(TIFF* tif, ttag_t tag, va_list ap)
|
|
{
|
|
TIFFPredictorState *sp = PredictorState(tif);
|
|
|
|
switch (tag) {
|
|
case TIFFTAG_PREDICTOR:
|
|
sp->predictor = (uint16) va_arg(ap, int);
|
|
TIFFSetFieldBit(tif, FIELD_PREDICTOR);
|
|
break;
|
|
default:
|
|
return (*sp->vsetparent)(tif, tag, ap);
|
|
}
|
|
tif->tif_flags |= TIFF_DIRTYDIRECT;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
PredictorVGetField(TIFF* tif, ttag_t tag, va_list ap)
|
|
{
|
|
TIFFPredictorState *sp = PredictorState(tif);
|
|
|
|
switch (tag) {
|
|
case TIFFTAG_PREDICTOR:
|
|
*va_arg(ap, uint16*) = sp->predictor;
|
|
break;
|
|
default:
|
|
return (*sp->vgetparent)(tif, tag, ap);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#ifdef PDFLIB_TIFFWRITE_SUPPORT
|
|
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);
|
|
}
|
|
#endif /* PDFLIB_TIFFWRITE_SUPPORT */
|
|
|
|
int
|
|
TIFFPredictorInit(TIFF* tif)
|
|
{
|
|
TIFFPredictorState* sp = PredictorState(tif);
|
|
|
|
/*
|
|
* Merge codec-specific tag information and
|
|
* override parent get/set field methods.
|
|
*/
|
|
TIFFMergeFieldInfo(tif, predictFieldInfo, N(predictFieldInfo));
|
|
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;
|
|
#ifdef PDFLIB_TIFFWRITE_SUPPORT
|
|
tif->tif_tagmethods.printdir =
|
|
PredictorPrintDir; /* hook for predictor tag */
|
|
#endif /* PDFLIB_TIFFWRITE_SUPPORT */
|
|
|
|
sp->setupdecode = tif->tif_setupdecode;
|
|
tif->tif_setupdecode = PredictorSetupDecode;
|
|
sp->setupencode = tif->tif_setupencode;
|
|
tif->tif_setupencode = PredictorSetupEncode;
|
|
|
|
sp->predictor = 1; /* default value */
|
|
sp->pfunc = NULL; /* no predictor routine */
|
|
return 1;
|
|
}
|
|
|
|
/* vim: set ts=8 sts=8 sw=8 noet: */
|