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Diffstat (limited to 'third_party/libtiff/tif_predict.c')
| -rw-r--r-- | third_party/libtiff/tif_predict.c | 794 |
1 files changed, 794 insertions, 0 deletions
diff --git a/third_party/libtiff/tif_predict.c b/third_party/libtiff/tif_predict.c new file mode 100644 index 0000000000..1388dde59c --- /dev/null +++ b/third_party/libtiff/tif_predict.c @@ -0,0 +1,794 @@ +/* $Id: tif_predict.c,v 1.35 2015-08-31 15:05:57 erouault 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* tif, uint8* cp0, tmsize_t cc); +static void horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc); +static void horAcc32(TIFF* tif, uint8* cp0, tmsize_t cc); +static void swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc); +static void swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc); +static void horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc); +static void horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc); +static void horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc); +static void swabHorDiff16(TIFF* tif, uint8* cp0, tmsize_t cc); +static void swabHorDiff32(TIFF* tif, uint8* cp0, tmsize_t cc); +static void fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc); +static void fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc); +static int PredictorDecodeRow(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s); +static int PredictorDecodeTile(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s); +static int PredictorEncodeRow(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s); +static int PredictorEncodeTile(TIFF* tif, uint8* bp0, tmsize_t cc0, uint16 s); + +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); + if (sp->rowsize == 0) + return 0; + + 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; + } + + /* + * If the data is horizontally differenced 16-bit data that + * requires byte-swapping, then it must be byte swapped after + * the differenciation 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->encodepfunc == horDiff16) { + sp->encodepfunc = swabHorDiff16; + tif->tif_postdecode = _TIFFNoPostDecode; + } else if (sp->encodepfunc == horDiff32) { + sp->encodepfunc = swabHorDiff32; + tif->tif_postdecode = _TIFFNoPostDecode; + } + } + } + + 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: { tmsize_t i; for (i = n-4; i > 0; i--) { op; } } \ + case 4: op; \ + case 3: op; \ + case 2: op; \ + case 1: op; \ + case 0: ; \ + } + +/* Remarks related to C standard compliance in all below functions : */ +/* - to avoid any undefined behaviour, we only operate on unsigned types */ +/* since the behaviour of "overflows" is defined (wrap over) */ +/* - when storing into the byte stream, we explicitly mask with 0xff so */ +/* as to make icc -check=conversions happy (not necessary by the standard) */ + +static void +horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + tmsize_t stride = PredictorState(tif)->stride; + + unsigned char* cp = (unsigned char*) cp0; + assert((cc%stride)==0); + if (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]; + cc -= 3; + cp += 3; + while (cc>0) { + cp[0] = (unsigned char) ((cr += cp[0]) & 0xff); + cp[1] = (unsigned char) ((cg += cp[1]) & 0xff); + cp[2] = (unsigned char) ((cb += cp[2]) & 0xff); + cc -= 3; + cp += 3; + } + } else if (stride == 4) { + unsigned int cr = cp[0]; + unsigned int cg = cp[1]; + unsigned int cb = cp[2]; + unsigned int ca = cp[3]; + cc -= 4; + cp += 4; + while (cc>0) { + cp[0] = (unsigned char) ((cr += cp[0]) & 0xff); + cp[1] = (unsigned char) ((cg += cp[1]) & 0xff); + cp[2] = (unsigned char) ((cb += cp[2]) & 0xff); + cp[3] = (unsigned char) ((ca += cp[3]) & 0xff); + cc -= 4; + cp += 4; + } + } else { + cc -= stride; + do { + REPEAT4(stride, cp[stride] = + (unsigned char) ((cp[stride] + *cp) & 0xff); cp++) + cc -= stride; + } while (cc>0); + } + } +} + +static void +swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + uint16* wp = (uint16*) cp0; + tmsize_t wc = cc / 2; + + TIFFSwabArrayOfShort(wp, wc); + horAcc16(tif, cp0, cc); +} + +static void +horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + tmsize_t stride = PredictorState(tif)->stride; + uint16* wp = (uint16*) cp0; + tmsize_t wc = cc / 2; + + assert((cc%(2*stride))==0); + + if (wc > stride) { + wc -= stride; + do { + REPEAT4(stride, wp[stride] = (uint16)(((unsigned int)wp[stride] + (unsigned int)wp[0]) & 0xffff); wp++) + wc -= stride; + } while (wc > 0); + } +} + +static void +swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + uint32* wp = (uint32*) cp0; + tmsize_t wc = cc / 4; + + TIFFSwabArrayOfLong(wp, wc); + horAcc32(tif, cp0, cc); +} + +static void +horAcc32(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + tmsize_t stride = PredictorState(tif)->stride; + uint32* wp = (uint32*) cp0; + tmsize_t wc = cc / 4; + + assert((cc%(4*stride))==0); + + if (wc > stride) { + wc -= stride; + do { + REPEAT4(stride, wp[stride] += wp[0]; wp++) + wc -= stride; + } while (wc > 0); + } +} + +/* + * Floating point predictor accumulation routine. + */ +static void +fpAcc(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 = cc; + uint8 *cp = (uint8 *) cp0; + uint8 *tmp = (uint8 *)_TIFFmalloc(cc); + + assert((cc%(bps*stride))==0); + + if (!tmp) + return; + + while (count > stride) { + REPEAT4(stride, cp[stride] = + (unsigned char) ((cp[stride] + cp[0]) & 0xff); 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, uint8* op0, tmsize_t occ0, uint16 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, uint8* op0, tmsize_t occ0, uint16 s) +{ + TIFFPredictorState *sp = PredictorState(tif); + + assert(sp != NULL); + assert(sp->decodetile != NULL); + + if ((*sp->decodetile)(tif, op0, occ0, s)) { + tmsize_t rowsize = sp->rowsize; + assert(rowsize > 0); + assert((occ0%rowsize)==0); + assert(sp->decodepfunc != NULL); + while (occ0 > 0) { + (*sp->decodepfunc)(tif, op0, rowsize); + occ0 -= rowsize; + op0 += rowsize; + } + return 1; + } else + return 0; +} + +static void +horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + TIFFPredictorState* sp = PredictorState(tif); + tmsize_t stride = sp->stride; + unsigned char* cp = (unsigned char*) cp0; + + assert((cc%stride)==0); + + if (cc > stride) { + cc -= stride; + /* + * Pipeline the most common cases. + */ + if (stride == 3) { + unsigned int r1, g1, b1; + unsigned int r2 = cp[0]; + unsigned int g2 = cp[1]; + unsigned int b2 = cp[2]; + do { + r1 = cp[3]; cp[3] = (unsigned char)((r1-r2)&0xff); r2 = r1; + g1 = cp[4]; cp[4] = (unsigned char)((g1-g2)&0xff); g2 = g1; + b1 = cp[5]; cp[5] = (unsigned char)((b1-b2)&0xff); b2 = b1; + cp += 3; + } while ((cc -= 3) > 0); + } else if (stride == 4) { + unsigned int r1, g1, b1, a1; + unsigned int r2 = cp[0]; + unsigned int g2 = cp[1]; + unsigned int b2 = cp[2]; + unsigned int a2 = cp[3]; + do { + r1 = cp[4]; cp[4] = (unsigned char)((r1-r2)&0xff); r2 = r1; + g1 = cp[5]; cp[5] = (unsigned char)((g1-g2)&0xff); g2 = g1; + b1 = cp[6]; cp[6] = (unsigned char)((b1-b2)&0xff); b2 = b1; + a1 = cp[7]; cp[7] = (unsigned char)((a1-a2)&0xff); a2 = a1; + cp += 4; + } while ((cc -= 4) > 0); + } else { + cp += cc - 1; + do { + REPEAT4(stride, cp[stride] = (unsigned char)((cp[stride] - cp[0])&0xff); cp--) + } while ((cc -= stride) > 0); + } + } +} + +static void +horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + TIFFPredictorState* sp = PredictorState(tif); + tmsize_t stride = sp->stride; + uint16 *wp = (uint16*) cp0; + tmsize_t wc = cc/2; + + assert((cc%(2*stride))==0); + + if (wc > stride) { + wc -= stride; + wp += wc - 1; + do { + REPEAT4(stride, wp[stride] = (uint16)(((unsigned int)wp[stride] - (unsigned int)wp[0]) & 0xffff); wp--) + wc -= stride; + } while (wc > 0); + } +} + +static void +swabHorDiff16(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + uint16* wp = (uint16*) cp0; + tmsize_t wc = cc / 2; + + horDiff16(tif, cp0, cc); + + TIFFSwabArrayOfShort(wp, wc); +} + +static void +horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + TIFFPredictorState* sp = PredictorState(tif); + tmsize_t stride = sp->stride; + uint32 *wp = (uint32*) 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); + } +} + +static void +swabHorDiff32(TIFF* tif, uint8* cp0, tmsize_t cc) +{ + uint32* wp = (uint32*) cp0; + tmsize_t wc = cc / 4; + + horDiff32(tif, cp0, cc); + + TIFFSwabArrayOfLong(wp, wc); +} + +/* + * 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] = (unsigned char)((cp[stride] - cp[0])&0xff); 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: + */ |