diff options
Diffstat (limited to 'plugins/FreeImage/src/LibTIFF/tif_predict.c')
| -rw-r--r-- | plugins/FreeImage/src/LibTIFF/tif_predict.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/plugins/FreeImage/src/LibTIFF/tif_predict.c b/plugins/FreeImage/src/LibTIFF/tif_predict.c new file mode 100644 index 0000000000..7f7dc636be --- /dev/null +++ b/plugins/FreeImage/src/LibTIFF/tif_predict.c @@ -0,0 +1,736 @@ +/* $Id: tif_predict.c,v 1.37 2011/04/10 17:14:09 drolon Exp $ */
+
+/*
+ * 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).
+ */
+#include "tiffiop.h"
+#include "tif_predict.h"
+
+#define PredictorState(tif) ((TIFFPredictorState*) (tif)->tif_data)
+
+static void horAcc8(TIFF*, tidata_t, tsize_t);
+static void horAcc16(TIFF*, tidata_t, tsize_t);
+static void horAcc32(TIFF*, tidata_t, tsize_t);
+static void swabHorAcc16(TIFF*, tidata_t, tsize_t);
+static void swabHorAcc32(TIFF*, tidata_t, tsize_t);
+static void horDiff8(TIFF*, tidata_t, tsize_t);
+static void horDiff16(TIFF*, tidata_t, tsize_t);
+static void horDiff32(TIFF*, tidata_t, tsize_t);
+static void fpAcc(TIFF*, tidata_t, tsize_t);
+static void fpDiff(TIFF*, tidata_t, tsize_t);
+static int PredictorDecodeRow(TIFF*, tidata_t, tsize_t, tsample_t);
+static int PredictorDecodeTile(TIFF*, tidata_t, tsize_t, tsample_t);
+static int PredictorEncodeRow(TIFF*, tidata_t, tsize_t, tsample_t);
+static int PredictorEncodeTile(TIFF*, tidata_t, tsize_t, tsample_t);
+
+static int
+PredictorSetup(TIFF* tif)
+{
+ static const char module[] = "PredictorSetup";
+
+ TIFFPredictorState* sp = PredictorState(tif);
+ TIFFDirectory* td = &tif->tif_dir;
+
+ switch (sp->predictor) /* no differencing */
+ {
+ case PREDICTOR_NONE:
+ return 1;
+ 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 %d-bit samples",
+ td->td_bitspersample);
+ return 0;
+ }
+ break;
+ case PREDICTOR_FLOATINGPOINT:
+ if (td->td_sampleformat != SAMPLEFORMAT_IEEEFP) {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Floating point \"Predictor\" not supported with %d data format",
+ td->td_sampleformat);
+ return 0;
+ }
+ break;
+ default:
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "\"Predictor\" value %d not supported",
+ sp->predictor);
+ return 0;
+ }
+ sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
+ 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 1;
+}
+
+static int
+PredictorSetupDecode(TIFF* tif)
+{
+ TIFFPredictorState* sp = PredictorState(tif);
+ TIFFDirectory* td = &tif->tif_dir;
+
+ if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
+ return 0;
+
+ if (sp->predictor == 2) {
+ 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 & 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 == 3) {
+ 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 & TIFF_SWAB) {
+ tif->tif_postdecode = _TIFFNoPostDecode;
+ }
+ /*
+ * Allocate buffer to keep the decoded bytes before
+ * rearranging in the ight order
+ */
+ }
+
+ return 1;
+}
+
+static int
+PredictorSetupEncode(TIFF* tif)
+{
+ TIFFPredictorState* sp = PredictorState(tif);
+ TIFFDirectory* td = &tif->tif_dir;
+
+ if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
+ return 0;
+
+ if (sp->predictor == 2) {
+ 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 == 3) {
+ 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 1;
+}
+
+#define REPEAT4(n, op) \
+ switch (n) { \
+ default: { int i; for (i = n-4; i > 0; i--) { op; } } \
+ case 4: op; \
+ case 3: op; \
+ case 2: op; \
+ case 1: op; \
+ case 0: ; \
+ }
+
+static void
+horAcc8(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+
+ char* cp = (char*) cp0;
+ if (cc > stride) {
+ cc -= stride;
+ /*
+ * Pipeline the most common cases.
+ */
+ if (stride == 3) {
+ unsigned int cr = cp[0];
+ unsigned int cg = cp[1];
+ unsigned int cb = cp[2];
+ do {
+ cc -= 3, cp += 3;
+ cp[0] = (char) (cr += cp[0]);
+ cp[1] = (char) (cg += cp[1]);
+ cp[2] = (char) (cb += cp[2]);
+ } while ((int32) cc > 0);
+ } else if (stride == 4) {
+ unsigned int cr = cp[0];
+ unsigned int cg = cp[1];
+ unsigned int cb = cp[2];
+ unsigned int ca = cp[3];
+ do {
+ cc -= 4, cp += 4;
+ cp[0] = (char) (cr += cp[0]);
+ cp[1] = (char) (cg += cp[1]);
+ cp[2] = (char) (cb += cp[2]);
+ cp[3] = (char) (ca += cp[3]);
+ } while ((int32) cc > 0);
+ } else {
+ do {
+ REPEAT4(stride, cp[stride] =
+ (char) (cp[stride] + *cp); cp++)
+ cc -= stride;
+ } while ((int32) cc > 0);
+ }
+ }
+}
+
+static void
+swabHorAcc16(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+ uint16* wp = (uint16*) cp0;
+ tsize_t wc = cc / 2;
+
+ if (wc > stride) {
+ TIFFSwabArrayOfShort(wp, wc);
+ wc -= stride;
+ do {
+ REPEAT4(stride, wp[stride] += wp[0]; wp++)
+ wc -= stride;
+ } while ((int32) wc > 0);
+ }
+}
+
+static void
+horAcc16(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+ uint16* wp = (uint16*) cp0;
+ tsize_t wc = cc / 2;
+
+ if (wc > stride) {
+ wc -= stride;
+ do {
+ REPEAT4(stride, wp[stride] += wp[0]; wp++)
+ wc -= stride;
+ } while ((int32) wc > 0);
+ }
+}
+
+static void
+swabHorAcc32(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+ uint32* wp = (uint32*) cp0;
+ tsize_t wc = cc / 4;
+
+ if (wc > stride) {
+ TIFFSwabArrayOfLong(wp, wc);
+ wc -= stride;
+ do {
+ REPEAT4(stride, wp[stride] += wp[0]; wp++)
+ wc -= stride;
+ } while ((int32) wc > 0);
+ }
+}
+
+static void
+horAcc32(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+ uint32* wp = (uint32*) cp0;
+ tsize_t wc = cc / 4;
+
+ if (wc > stride) {
+ wc -= stride;
+ do {
+ REPEAT4(stride, wp[stride] += wp[0]; wp++)
+ wc -= stride;
+ } while ((int32) wc > 0);
+ }
+}
+
+/*
+ * Floating point predictor accumulation routine.
+ */
+static void
+fpAcc(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+ uint32 bps = tif->tif_dir.td_bitspersample / 8;
+ tsize_t wc = cc / bps;
+ tsize_t count = cc;
+ uint8 *cp = (uint8 *) cp0;
+ uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
+
+ if (!tmp)
+ return;
+
+ while (count > stride) {
+ REPEAT4(stride, cp[stride] += cp[0]; cp++)
+ count -= stride;
+ }
+
+ _TIFFmemcpy(tmp, cp0, cc);
+ cp = (uint8 *) cp0;
+ for (count = 0; count < wc; count++) {
+ uint32 byte;
+ for (byte = 0; byte < bps; byte++) {
+#if WORDS_BIGENDIAN
+ cp[bps * count + byte] = tmp[byte * wc + count];
+#else
+ cp[bps * count + byte] =
+ tmp[(bps - byte - 1) * wc + count];
+#endif
+ }
+ }
+ _TIFFfree(tmp);
+}
+
+/*
+ * Decode a scanline and apply the predictor routine.
+ */
+static int
+PredictorDecodeRow(TIFF* tif, tidata_t op0, tsize_t occ0, tsample_t s)
+{
+ TIFFPredictorState *sp = PredictorState(tif);
+
+ assert(sp != NULL);
+ assert(sp->decoderow != NULL);
+ assert(sp->decodepfunc != NULL);
+
+ if ((*sp->decoderow)(tif, op0, occ0, s)) {
+ (*sp->decodepfunc)(tif, op0, occ0);
+ return 1;
+ } else
+ return 0;
+}
+
+/*
+ * 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 int
+PredictorDecodeTile(TIFF* tif, tidata_t op0, tsize_t occ0, tsample_t s)
+{
+ TIFFPredictorState *sp = PredictorState(tif);
+
+ assert(sp != NULL);
+ assert(sp->decodetile != NULL);
+
+ if ((*sp->decodetile)(tif, op0, occ0, s)) {
+ tsize_t rowsize = sp->rowsize;
+ assert(rowsize > 0);
+ assert(sp->decodepfunc != NULL);
+ while ((long)occ0 > 0) {
+ (*sp->decodepfunc)(tif, op0, (tsize_t) rowsize);
+ occ0 -= rowsize;
+ op0 += rowsize;
+ }
+ return 1;
+ } else
+ return 0;
+}
+
+static void
+horDiff8(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ TIFFPredictorState* sp = PredictorState(tif);
+ tsize_t stride = sp->stride;
+ char* cp = (char*) cp0;
+
+ if (cc > stride) {
+ cc -= stride;
+ /*
+ * Pipeline the most common cases.
+ */
+ if (stride == 3) {
+ int r1, g1, b1;
+ int r2 = cp[0];
+ int g2 = cp[1];
+ int b2 = cp[2];
+ do {
+ r1 = cp[3]; cp[3] = r1-r2; r2 = r1;
+ g1 = cp[4]; cp[4] = g1-g2; g2 = g1;
+ b1 = cp[5]; cp[5] = b1-b2; b2 = b1;
+ cp += 3;
+ } while ((int32)(cc -= 3) > 0);
+ } else if (stride == 4) {
+ int r1, g1, b1, a1;
+ int r2 = cp[0];
+ int g2 = cp[1];
+ int b2 = cp[2];
+ int a2 = cp[3];
+ do {
+ r1 = cp[4]; cp[4] = r1-r2; r2 = r1;
+ g1 = cp[5]; cp[5] = g1-g2; g2 = g1;
+ b1 = cp[6]; cp[6] = b1-b2; b2 = b1;
+ a1 = cp[7]; cp[7] = a1-a2; a2 = a1;
+ cp += 4;
+ } while ((int32)(cc -= 4) > 0);
+ } else {
+ cp += cc - 1;
+ do {
+ REPEAT4(stride, cp[stride] -= cp[0]; cp--)
+ } while ((int32)(cc -= stride) > 0);
+ }
+ }
+}
+
+static void
+horDiff16(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ TIFFPredictorState* sp = PredictorState(tif);
+ tsize_t stride = sp->stride;
+ int16 *wp = (int16*) cp0;
+ tsize_t wc = cc/2;
+
+ if (wc > stride) {
+ wc -= stride;
+ wp += wc - 1;
+ do {
+ REPEAT4(stride, wp[stride] -= wp[0]; wp--)
+ wc -= stride;
+ } while ((int32) wc > 0);
+ }
+}
+
+static void
+horDiff32(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ TIFFPredictorState* sp = PredictorState(tif);
+ tsize_t stride = sp->stride;
+ int32 *wp = (int32*) cp0;
+ tsize_t wc = cc/4;
+
+ if (wc > stride) {
+ wc -= stride;
+ wp += wc - 1;
+ do {
+ REPEAT4(stride, wp[stride] -= wp[0]; wp--)
+ wc -= stride;
+ } while ((int32) wc > 0);
+ }
+}
+
+/*
+ * Floating point predictor differencing routine.
+ */
+static void
+fpDiff(TIFF* tif, tidata_t cp0, tsize_t cc)
+{
+ tsize_t stride = PredictorState(tif)->stride;
+ uint32 bps = tif->tif_dir.td_bitspersample / 8;
+ tsize_t wc = cc / bps;
+ tsize_t count;
+ uint8 *cp = (uint8 *) cp0;
+ uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
+
+ 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, tidata_t bp, tsize_t cc, tsample_t 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, tidata_t bp0, tsize_t cc0, tsample_t s)
+{
+ static const char module[] = "PredictorEncodeTile";
+ TIFFPredictorState *sp = PredictorState(tif);
+ uint8 *working_copy;
+ tsize_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 %d 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 TIFFFieldInfo predictFieldInfo[] = {
+ { TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, FIELD_PREDICTOR,
+ FALSE, FALSE, "Predictor" },
+};
+
+static int
+PredictorVSetField(TIFF* tif, ttag_t 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, 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);
+
+ 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 (!_TIFFMergeFieldInfo(tif, predictFieldInfo,
+ TIFFArrayCount(predictFieldInfo))) {
+ 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:
+ */
|