| /* $Id: tif_predict.c,v 1.27 2009/09/06 13:11:29 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: */ |