--- /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