+++ /dev/null
-/* $Id: tif_predict.c,v 1.1 2005/06/17 13:54:52 vp153 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 swabHorAcc16(TIFF*, tidata_t, tsize_t);
-static void horDiff8(TIFF*, tidata_t, tsize_t);
-static void horDiff16(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)
-{
- TIFFPredictorState* sp = PredictorState(tif);
- TIFFDirectory* td = &tif->tif_dir;
-
- if (sp->predictor == 1) /* no differencing */
- return (1);
- if (sp->predictor != 2) {
- TIFFError(tif->tif_name, "\"Predictor\" value %d not supported",
- sp->predictor);
- return (0);
- }
- if (td->td_bitspersample != 8 && td->td_bitspersample != 16) {
- TIFFError(tif->tif_name,
- "Horizontal differencing \"Predictor\" not supported with %d-bit samples",
- td->td_bitspersample);
- 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->pfunc = horAcc8; break;
- case 16: sp->pfunc = horAcc16; break;
- }
- /*
- * Override default decoding method with
- * one that does the predictor stuff.
- */
- sp->coderow = tif->tif_decoderow;
- tif->tif_decoderow = PredictorDecodeRow;
- sp->codestrip = tif->tif_decodestrip;
- tif->tif_decodestrip = PredictorDecodeTile;
- sp->codetile = 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->pfunc == horAcc16) {
- sp->pfunc = swabHorAcc16;
- tif->tif_postdecode = _TIFFNoPostDecode;
- } /* else handle 32-bit case... */
- }
- }
- 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->pfunc = horDiff8; break;
- case 16: sp->pfunc = horDiff16; break;
- }
- /*
- * Override default encoding method with
- * one that does the predictor stuff.
- */
- sp->coderow = tif->tif_encoderow;
- tif->tif_encoderow = PredictorEncodeRow;
- sp->codestrip = tif->tif_encodestrip;
- tif->tif_encodestrip = PredictorEncodeTile;
- sp->codetile = 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)
-{
- 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) {
- 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)
-{
- TIFFPredictorState* sp = PredictorState(tif);
- tsize_t stride = sp->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);
- }
-}
-
-/*
- * 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->coderow != NULL);
- assert(sp->pfunc != NULL);
- if ((*sp->coderow)(tif, op0, occ0, s)) {
- (*sp->pfunc)(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->codetile != NULL);
- if ((*sp->codetile)(tif, op0, occ0, s)) {
- tsize_t rowsize = sp->rowsize;
- assert(rowsize > 0);
- assert(sp->pfunc != NULL);
- while ((long)occ0 > 0) {
- (*sp->pfunc)(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 int
-PredictorEncodeRow(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
-{
- TIFFPredictorState *sp = PredictorState(tif);
-
- assert(sp != NULL);
- assert(sp->pfunc != NULL);
- assert(sp->coderow != NULL);
-/* XXX horizontal differencing alters user's data XXX */
- (*sp->pfunc)(tif, bp, cc);
- return ((*sp->coderow)(tif, bp, cc, s));
-}
-
-static int
-PredictorEncodeTile(TIFF* tif, tidata_t bp0, tsize_t cc0, tsample_t s)
-{
- TIFFPredictorState *sp = PredictorState(tif);
- tsize_t cc = cc0, rowsize;
- unsigned char* bp = bp0;
-
- assert(sp != NULL);
- assert(sp->pfunc != NULL);
- assert(sp->codetile != NULL);
- 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);
-}
-
-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;
- }
- 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);
-
- /*
- * 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;
- 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->pfunc = NULL; /* no predictor routine */
- return (1);
-}
-
-/* vim: set ts=8 sts=8 sw=8 noet: */
projects / opencv / blobdiff