465 lines
12 KiB
C
465 lines
12 KiB
C
/* $Id: tif_predict.c,v 1.1 2005-06-17 13:54:52 vp153 Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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*
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* Predictor Tag Support (used by multiple codecs).
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*/
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#include "tiffiop.h"
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#include "tif_predict.h"
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#define PredictorState(tif) ((TIFFPredictorState*) (tif)->tif_data)
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static void horAcc8(TIFF*, tidata_t, tsize_t);
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static void horAcc16(TIFF*, tidata_t, tsize_t);
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static void swabHorAcc16(TIFF*, tidata_t, tsize_t);
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static void horDiff8(TIFF*, tidata_t, tsize_t);
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static void horDiff16(TIFF*, tidata_t, tsize_t);
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static int PredictorDecodeRow(TIFF*, tidata_t, tsize_t, tsample_t);
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static int PredictorDecodeTile(TIFF*, tidata_t, tsize_t, tsample_t);
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static int PredictorEncodeRow(TIFF*, tidata_t, tsize_t, tsample_t);
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static int PredictorEncodeTile(TIFF*, tidata_t, tsize_t, tsample_t);
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static int
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PredictorSetup(TIFF* tif)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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TIFFDirectory* td = &tif->tif_dir;
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if (sp->predictor == 1) /* no differencing */
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return (1);
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if (sp->predictor != 2) {
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TIFFError(tif->tif_name, "\"Predictor\" value %d not supported",
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sp->predictor);
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return (0);
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}
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if (td->td_bitspersample != 8 && td->td_bitspersample != 16) {
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TIFFError(tif->tif_name,
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"Horizontal differencing \"Predictor\" not supported with %d-bit samples",
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td->td_bitspersample);
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return (0);
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}
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sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
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td->td_samplesperpixel : 1);
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/*
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* Calculate the scanline/tile-width size in bytes.
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*/
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if (isTiled(tif))
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sp->rowsize = TIFFTileRowSize(tif);
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else
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sp->rowsize = TIFFScanlineSize(tif);
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return (1);
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}
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static int
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PredictorSetupDecode(TIFF* tif)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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TIFFDirectory* td = &tif->tif_dir;
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if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
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return (0);
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if (sp->predictor == 2) {
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switch (td->td_bitspersample) {
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case 8: sp->pfunc = horAcc8; break;
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case 16: sp->pfunc = horAcc16; break;
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}
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/*
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* Override default decoding method with
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* one that does the predictor stuff.
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*/
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sp->coderow = tif->tif_decoderow;
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tif->tif_decoderow = PredictorDecodeRow;
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sp->codestrip = tif->tif_decodestrip;
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tif->tif_decodestrip = PredictorDecodeTile;
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sp->codetile = tif->tif_decodetile;
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tif->tif_decodetile = PredictorDecodeTile;
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/*
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* If the data is horizontally differenced
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* 16-bit data that requires byte-swapping,
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* then it must be byte swapped before the
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* accumulation step. We do this with a
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* special-purpose routine and override the
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* normal post decoding logic that the library
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* setup when the directory was read.
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*/
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if (tif->tif_flags&TIFF_SWAB) {
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if (sp->pfunc == horAcc16) {
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sp->pfunc = swabHorAcc16;
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tif->tif_postdecode = _TIFFNoPostDecode;
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} /* else handle 32-bit case... */
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}
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}
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return (1);
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}
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static int
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PredictorSetupEncode(TIFF* tif)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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TIFFDirectory* td = &tif->tif_dir;
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if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
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return (0);
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if (sp->predictor == 2) {
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switch (td->td_bitspersample) {
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case 8: sp->pfunc = horDiff8; break;
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case 16: sp->pfunc = horDiff16; break;
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}
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/*
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* Override default encoding method with
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* one that does the predictor stuff.
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*/
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sp->coderow = tif->tif_encoderow;
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tif->tif_encoderow = PredictorEncodeRow;
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sp->codestrip = tif->tif_encodestrip;
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tif->tif_encodestrip = PredictorEncodeTile;
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sp->codetile = tif->tif_encodetile;
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tif->tif_encodetile = PredictorEncodeTile;
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}
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return (1);
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}
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#define REPEAT4(n, op) \
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switch (n) { \
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default: { int i; for (i = n-4; i > 0; i--) { op; } } \
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case 4: op; \
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case 3: op; \
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case 2: op; \
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case 1: op; \
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case 0: ; \
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}
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static void
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horAcc8(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tsize_t stride = sp->stride;
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char* cp = (char*) cp0;
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if (cc > stride) {
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cc -= stride;
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/*
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* Pipeline the most common cases.
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*/
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if (stride == 3) {
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unsigned int cr = cp[0];
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unsigned int cg = cp[1];
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unsigned int cb = cp[2];
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do {
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cc -= 3, cp += 3;
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cp[0] = (char) (cr += cp[0]);
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cp[1] = (char) (cg += cp[1]);
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cp[2] = (char) (cb += cp[2]);
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} while ((int32) cc > 0);
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} else if (stride == 4) {
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unsigned int cr = cp[0];
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unsigned int cg = cp[1];
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unsigned int cb = cp[2];
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unsigned int ca = cp[3];
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do {
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cc -= 4, cp += 4;
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cp[0] = (char) (cr += cp[0]);
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cp[1] = (char) (cg += cp[1]);
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cp[2] = (char) (cb += cp[2]);
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cp[3] = (char) (ca += cp[3]);
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} while ((int32) cc > 0);
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} else {
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do {
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REPEAT4(stride, cp[stride] = (char) (cp[stride] + *cp); cp++)
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cc -= stride;
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} while ((int32) cc > 0);
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}
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}
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}
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static void
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swabHorAcc16(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tsize_t stride = sp->stride;
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uint16* wp = (uint16*) cp0;
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tsize_t wc = cc / 2;
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if (wc > stride) {
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TIFFSwabArrayOfShort(wp, wc);
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wc -= stride;
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do {
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REPEAT4(stride, wp[stride] += wp[0]; wp++)
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wc -= stride;
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} while ((int32) wc > 0);
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}
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}
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static void
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horAcc16(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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tsize_t stride = PredictorState(tif)->stride;
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uint16* wp = (uint16*) cp0;
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tsize_t wc = cc / 2;
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if (wc > stride) {
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wc -= stride;
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do {
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REPEAT4(stride, wp[stride] += wp[0]; wp++)
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wc -= stride;
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} while ((int32) wc > 0);
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}
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}
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/*
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* Decode a scanline and apply the predictor routine.
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*/
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static int
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PredictorDecodeRow(TIFF* tif, tidata_t op0, tsize_t occ0, tsample_t s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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assert(sp != NULL);
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assert(sp->coderow != NULL);
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assert(sp->pfunc != NULL);
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if ((*sp->coderow)(tif, op0, occ0, s)) {
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(*sp->pfunc)(tif, op0, occ0);
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return (1);
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} else
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return (0);
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}
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/*
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* Decode a tile/strip and apply the predictor routine.
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* Note that horizontal differencing must be done on a
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* row-by-row basis. The width of a "row" has already
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* been calculated at pre-decode time according to the
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* strip/tile dimensions.
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*/
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static int
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PredictorDecodeTile(TIFF* tif, tidata_t op0, tsize_t occ0, tsample_t s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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assert(sp != NULL);
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assert(sp->codetile != NULL);
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if ((*sp->codetile)(tif, op0, occ0, s)) {
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tsize_t rowsize = sp->rowsize;
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assert(rowsize > 0);
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assert(sp->pfunc != NULL);
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while ((long)occ0 > 0) {
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(*sp->pfunc)(tif, op0, (tsize_t) rowsize);
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occ0 -= rowsize;
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op0 += rowsize;
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}
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return (1);
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} else
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return (0);
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}
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static void
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horDiff8(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tsize_t stride = sp->stride;
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char* cp = (char*) cp0;
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if (cc > stride) {
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cc -= stride;
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/*
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* Pipeline the most common cases.
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*/
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if (stride == 3) {
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int r1, g1, b1;
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int r2 = cp[0];
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int g2 = cp[1];
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int b2 = cp[2];
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do {
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r1 = cp[3]; cp[3] = r1-r2; r2 = r1;
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g1 = cp[4]; cp[4] = g1-g2; g2 = g1;
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b1 = cp[5]; cp[5] = b1-b2; b2 = b1;
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cp += 3;
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} while ((int32)(cc -= 3) > 0);
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} else if (stride == 4) {
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int r1, g1, b1, a1;
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int r2 = cp[0];
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int g2 = cp[1];
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int b2 = cp[2];
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int a2 = cp[3];
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do {
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r1 = cp[4]; cp[4] = r1-r2; r2 = r1;
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g1 = cp[5]; cp[5] = g1-g2; g2 = g1;
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b1 = cp[6]; cp[6] = b1-b2; b2 = b1;
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a1 = cp[7]; cp[7] = a1-a2; a2 = a1;
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cp += 4;
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} while ((int32)(cc -= 4) > 0);
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} else {
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cp += cc - 1;
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do {
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REPEAT4(stride, cp[stride] -= cp[0]; cp--)
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} while ((int32)(cc -= stride) > 0);
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}
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}
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}
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static void
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horDiff16(TIFF* tif, tidata_t cp0, tsize_t cc)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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tsize_t stride = sp->stride;
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int16 *wp = (int16*) cp0;
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tsize_t wc = cc/2;
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if (wc > stride) {
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wc -= stride;
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wp += wc - 1;
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do {
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REPEAT4(stride, wp[stride] -= wp[0]; wp--)
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wc -= stride;
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} while ((int32) wc > 0);
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}
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}
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static int
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PredictorEncodeRow(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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assert(sp != NULL);
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assert(sp->pfunc != NULL);
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assert(sp->coderow != NULL);
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/* XXX horizontal differencing alters user's data XXX */
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(*sp->pfunc)(tif, bp, cc);
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return ((*sp->coderow)(tif, bp, cc, s));
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}
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static int
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PredictorEncodeTile(TIFF* tif, tidata_t bp0, tsize_t cc0, tsample_t s)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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tsize_t cc = cc0, rowsize;
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unsigned char* bp = bp0;
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assert(sp != NULL);
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assert(sp->pfunc != NULL);
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assert(sp->codetile != NULL);
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rowsize = sp->rowsize;
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assert(rowsize > 0);
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while ((long)cc > 0) {
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(*sp->pfunc)(tif, bp, (tsize_t) rowsize);
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cc -= rowsize;
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bp += rowsize;
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}
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return ((*sp->codetile)(tif, bp0, cc0, s));
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}
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#define FIELD_PREDICTOR (FIELD_CODEC+0) /* XXX */
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static const TIFFFieldInfo predictFieldInfo[] = {
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{ TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, FIELD_PREDICTOR,
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FALSE, FALSE, "Predictor" },
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};
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#define N(a) (sizeof (a) / sizeof (a[0]))
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static int
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PredictorVSetField(TIFF* tif, ttag_t tag, va_list ap)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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switch (tag) {
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case TIFFTAG_PREDICTOR:
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sp->predictor = (uint16) va_arg(ap, int);
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TIFFSetFieldBit(tif, FIELD_PREDICTOR);
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break;
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default:
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return (*sp->vsetparent)(tif, tag, ap);
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}
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tif->tif_flags |= TIFF_DIRTYDIRECT;
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return (1);
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}
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static int
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PredictorVGetField(TIFF* tif, ttag_t tag, va_list ap)
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{
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TIFFPredictorState *sp = PredictorState(tif);
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switch (tag) {
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case TIFFTAG_PREDICTOR:
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*va_arg(ap, uint16*) = sp->predictor;
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break;
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default:
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return (*sp->vgetparent)(tif, tag, ap);
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}
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return (1);
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}
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static void
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PredictorPrintDir(TIFF* tif, FILE* fd, long flags)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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(void) flags;
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if (TIFFFieldSet(tif,FIELD_PREDICTOR)) {
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fprintf(fd, " Predictor: ");
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switch (sp->predictor) {
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case 1: fprintf(fd, "none "); break;
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case 2: fprintf(fd, "horizontal differencing "); break;
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}
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fprintf(fd, "%u (0x%x)\n", sp->predictor, sp->predictor);
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}
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if (sp->printdir)
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(*sp->printdir)(tif, fd, flags);
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}
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int
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TIFFPredictorInit(TIFF* tif)
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{
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TIFFPredictorState* sp = PredictorState(tif);
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/*
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* Merge codec-specific tag information and
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* override parent get/set field methods.
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*/
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_TIFFMergeFieldInfo(tif, predictFieldInfo, N(predictFieldInfo));
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sp->vgetparent = tif->tif_tagmethods.vgetfield;
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tif->tif_tagmethods.vgetfield =
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PredictorVGetField;/* hook for predictor tag */
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sp->vsetparent = tif->tif_tagmethods.vsetfield;
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tif->tif_tagmethods.vsetfield =
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PredictorVSetField;/* hook for predictor tag */
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sp->printdir = tif->tif_tagmethods.printdir;
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tif->tif_tagmethods.printdir =
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PredictorPrintDir; /* hook for predictor tag */
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sp->setupdecode = tif->tif_setupdecode;
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tif->tif_setupdecode = PredictorSetupDecode;
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sp->setupencode = tif->tif_setupencode;
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tif->tif_setupencode = PredictorSetupEncode;
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sp->predictor = 1; /* default value */
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sp->pfunc = NULL; /* no predictor routine */
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return (1);
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}
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/* vim: set ts=8 sts=8 sw=8 noet: */
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