tif_predict.h

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/*
 * Copyright (c) 1995-1997 Sam Leffler
 * Copyright (c) 1995-1997 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.
 */

#ifndef _TIFFPREDICT_
#define _TIFFPREDICT_

#include "tiffio.h"
#include "tiffiop.h"

/*
 * ``Library-private'' Support for the Predictor Tag
 */

typedef int (*TIFFEncodeDecodeMethod)(TIFF* tif, uint8* buf, tmsize_t size);

/*
 * Codecs that want to support the Predictor tag must place
 * this structure first in their private state block so that
 * the predictor code can cast tif_data to find its state.
 */
typedef struct {
    int             predictor;  /* predictor tag value */
    tmsize_t        stride;     /* sample stride over data */
    tmsize_t        rowsize;    /* tile/strip row size */

    TIFFCodeMethod  encoderow;  /* parent codec encode/decode row */
    TIFFCodeMethod  encodestrip;    /* parent codec encode/decode strip */
    TIFFCodeMethod  encodetile; /* parent codec encode/decode tile */
    TIFFEncodeDecodeMethod  encodepfunc;    /* horizontal differencer */

    TIFFCodeMethod  decoderow;  /* parent codec encode/decode row */
    TIFFCodeMethod  decodestrip;    /* parent codec encode/decode strip */
    TIFFCodeMethod  decodetile; /* parent codec encode/decode tile */
    TIFFEncodeDecodeMethod  decodepfunc;    /* horizontal accumulator */

    TIFFVGetMethod  vgetparent; /* super-class method */
    TIFFVSetMethod  vsetparent; /* super-class method */
    TIFFPrintMethod printdir;   /* super-class method */
    TIFFBoolMethod  setupdecode;    /* super-class method */
    TIFFBoolMethod  setupencode;    /* super-class method */
} TIFFPredictorState;

#if defined(__cplusplus)
extern "C" {
#endif
extern int TIFFPredictorInit(TIFF*);
extern int TIFFPredictorCleanup(TIFF*);
#if defined(__cplusplus)
}
#endif
#endif /* _TIFFPREDICT_ */

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