libmng_data.h

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           mng_uint16        iGlobalBKGDblue;

           mng_ptr           pDeltaImage;        /* delta-image fields */
           mng_uint8         iDeltaImagetype;
#endif /* MNG_SUPPORT_DISPLAY */
           mng_uint8         iDeltatype;         /* need this one in read processing !! */
#ifdef MNG_SUPPORT_DISPLAY
           mng_uint32        iDeltaBlockwidth;
           mng_uint32        iDeltaBlockheight;
           mng_uint32        iDeltaBlockx;
           mng_uint32        iDeltaBlocky;
           mng_bool          bDeltaimmediate;

           mng_fptr          fDeltagetrow;       /* internal delta-proc callbacks */
           mng_fptr          fDeltaaddrow;
           mng_fptr          fDeltareplacerow;
           mng_fptr          fDeltaputrow;

#ifndef MNG_SKIPCHUNK_PROM
           mng_fptr          fPromoterow;        /* internal PROM fields */
           mng_fptr          fPromBitdepth;
           mng_ptr           pPromBuf;
           mng_uint8         iPromColortype;
           mng_uint8         iPromBitdepth;
           mng_uint8         iPromFilltype;
           mng_uint32        iPromWidth;
           mng_ptr           pPromSrc;
           mng_ptr           pPromDst;
#endif

#ifndef MNG_SKIPCHUNK_MAGN
           mng_uint16        iMAGNfromid;
           mng_uint16        iMAGNcurrentid;
           mng_uint16        iMAGNtoid;
#endif

#ifndef MNG_SKIPCHUNK_PAST
           mng_uint16        iPASTid;
           mng_int32         iPastx;             /* target x/y of last PAST */
           mng_int32         iPasty;
#endif

           mng_objectp       pLastseek;          /* last processed ani_seek object */  
#endif /* MNG_SUPPORT_DISPLAY */

#ifdef MNG_INCLUDE_ZLIB
           z_stream          sZlib;              /* zlib (de)compression variables */

           mng_int32         iZlevel;            /* zlib compression parameters */
           mng_int32         iZmethod;
           mng_int32         iZwindowbits;
           mng_int32         iZmemlevel;
           mng_int32         iZstrategy;

           mng_uint32        iMaxIDAT;           /* maximum size of IDAT data */

           mng_bool          bInflating;         /* indicates "inflate" in progress */
           mng_bool          bDeflating;         /* indicates "deflate" in progress */
#endif /* MNG_INCLUDE_ZLIB */

#ifdef MNG_INCLUDE_JNG
           mngjpeg_dctmethod eJPEGdctmethod;     /* IJG compression variables */
           mng_int32         iJPEGquality;
           mng_int32         iJPEGsmoothing;
           mng_bool          bJPEGcompressprogr;
           mng_bool          bJPEGcompressopt;

           mng_uint32        iMaxJDAT;           /* maximum size of JDAT/JDAA data */

           mngjpeg_compp     pJPEGcinfo;         /* compression structure */
           mngjpeg_errorp    pJPEGcerr;          /* error-manager compress */

           mngjpeg_decompp   pJPEGdinfo;         /* decompression structure (JDAT) */
           mngjpeg_errorp    pJPEGderr;          /* error-manager decompress (JDAT) */
           mngjpeg_sourcep   pJPEGdsrc;          /* source-manager decompress (JDAT) */

           mngjpeg_decompp   pJPEGdinfo2;        /* decompression structure (JDAA) */
           mngjpeg_errorp    pJPEGderr2;         /* error-manager decompress (JDAA) */
           mngjpeg_sourcep   pJPEGdsrc2;         /* source-manager decompress (JDAA) */

           mng_uint8p        pJPEGbuf;           /* buffer for JPEG (de)compression (JDAT) */
           mng_uint32        iJPEGbufmax;        /* allocated space for buffer (JDAT) */
           mng_uint8p        pJPEGcurrent;       /* current pointer into buffer (JDAT) */
           mng_uint32        iJPEGbufremain;     /* remaining bytes in buffer (JDAT) */
           mng_uint32        iJPEGtoskip;        /* bytes to skip on next input-block (JDAT) */

           mng_uint8p        pJPEGbuf2;          /* buffer for JPEG (de)compression (JDAA) */
           mng_uint32        iJPEGbufmax2;       /* allocated space for buffer (JDAA) */
           mng_uint8p        pJPEGcurrent2;      /* current pointer into buffer (JDAA) */
           mng_uint32        iJPEGbufremain2;    /* remaining bytes in buffer (JDAA) */
           mng_uint32        iJPEGtoskip2;       /* bytes to skip on next input-block (JDAA) */

           mng_uint8p        pJPEGrow;           /* buffer for a JPEG row of samples (JDAT) */
           mng_uint32        iJPEGrowlen;

           mng_uint8p        pJPEGrow2;          /* buffer for a JPEG row of samples (JDAA) */
           mng_uint32        iJPEGrowlen2;

           mng_bool          bJPEGcompress;      /* indicates "compress" initialized */

           mng_bool          bJPEGdecompress;    /* indicates "decompress" initialized (JDAT) */
           mng_bool          bJPEGhasheader;     /* indicates "readheader" succeeded (JDAT) */
           mng_bool          bJPEGdecostarted;   /* indicates "decompress" started (JDAT) */
           mng_bool          bJPEGscanstarted;   /* indicates "first scan" started (JDAT) */
           mng_bool          bJPEGscanending;    /* indicates "finish_output" suspended (JDAT) */
           mng_bool          bJPEGprogressive;   /* indicates a progressive image (JDAT) */

           mng_bool          bJPEGdecompress2;   /* indicates "decompress" initialized (JDAA) */
           mng_bool          bJPEGhasheader2;    /* indicates "readheader" succeeded (JDAA) */
           mng_bool          bJPEGdecostarted2;  /* indicates "decompress" started (JDAA) */
           mng_bool          bJPEGscanstarted2;  /* indicates "first scan" started (JDAA) */
           mng_bool          bJPEGprogressive2;  /* indicates a progressive image (JDAA) */

           mng_fptr          fStorerow2;         /* internal callback to store an
                                                    uncompressed/unfiltered row of JPEG-data (JDAT) */

           mng_fptr          fStorerow3;         /* internal callback to store an
                                                    uncompressed/unfiltered row of JPEG-data (JDAA) */

           mng_uint32        iJPEGrow;           /* row-number for current JPEG row */
           mng_uint32        iJPEGalpharow;      /* nr. of rows filled with alpha */
           mng_uint32        iJPEGrgbrow;        /* nr. of rows filled with 'color'-info */
           mng_uint32        iJPEGdisprow;       /* nr. of rows already displayed "on-the-fly" */

#if defined(MNG_USE_SETJMP) && defined (MNG_INCLUDE_IJG6B)
           jmp_buf           sErrorbuf;          /* setjmp/longjmp buffer (error-recovery) */
#endif

#endif /* MNG_INCLUDE_JNG */

#ifndef MNG_USE_ZLIB_CRC
           mng_uint32        aCRCtable [256];  /* CRC prefab table */
           mng_bool          bCRCcomputed;     /* "has been built" indicator */
#endif

#ifdef MNG_OPTIMIZE_FOOTPRINT_INIT
           png_imgtype       ePng_imgtype;
#endif

#if defined(MNG_NO_16BIT_SUPPORT)
           mng_uint8         iPNGdepth;     /* Real input depth */
           mng_uint8         iPNGmult;
#endif

        } mng_data;

typedef mng_data * mng_datap;

/* ************************************************************************** */
/* *                                                                        * */
/* * Internal Callback-Function prototypes                                  * */
/* *                                                                        * */
/* ************************************************************************** */

typedef mng_retcode(*mng_displayrow)  (mng_datap  pData);
typedef mng_retcode(*mng_restbkgdrow) (mng_datap  pData);
typedef mng_retcode(*mng_correctrow)  (mng_datap  pData);
typedef mng_retcode(*mng_retrieverow) (mng_datap  pData);
typedef mng_retcode(*mng_storerow)    (mng_datap  pData);
typedef mng_retcode(*mng_processrow)  (mng_datap  pData);
typedef mng_retcode(*mng_initrowproc) (mng_datap  pData);
typedef mng_retcode(*mng_differrow)   (mng_datap  pData);
typedef mng_retcode(*mng_scalerow)    (mng_datap  pData);
typedef mng_retcode(*mng_deltarow)    (mng_datap  pData);
typedef mng_retcode(*mng_promoterow)  (mng_datap  pData);
typedef mng_retcode(*mng_fliprow)     (mng_datap  pData);
typedef mng_retcode(*mng_tilerow)     (mng_datap  pData);

typedef mng_uint8  (*mng_bitdepth_8)  (mng_uint8  iB);
typedef mng_uint16 (*mng_bitdepth_16) (mng_uint8  iB);

typedef mng_retcode(*mng_magnify_x)   (mng_datap  pData,
                                       mng_uint16 iMX,
                                       mng_uint16 iML,
                                       mng_uint16 iMR,
                                       mng_uint32 iWidth,
                                       mng_uint8p iSrcline,
                                       mng_uint8p iDstline);
typedef mng_retcode(*mng_magnify_y)   (mng_datap  pData,
                                       mng_int32  iM,
                                       mng_int32  iS,
                                       mng_uint32 iWidth,
                                       mng_uint8p iSrcline1,
                                       mng_uint8p iSrcline2,
                                       mng_uint8p iDstline);

/* ************************************************************************** */
/* *                                                                        * */
/* * Routines for swapping byte-order from and to graphic files             * */
/* * (This code is adapted from the libpng package)                         * */
/* *                                                                        * */
/* ************************************************************************** */

#ifndef MNG_BIGENDIAN_SUPPORTED
mng_uint32 mng_get_uint32 (mng_uint8p pBuf);
mng_int32  mng_get_int32  (mng_uint8p pBuf);
mng_uint16 mng_get_uint16 (mng_uint8p pBuf);
void       mng_put_uint32 (mng_uint8p pBuf,
                           mng_uint32 i);
void       mng_put_int32  (mng_uint8p pBuf,
                           mng_int32  i);
void       mng_put_uint16 (mng_uint8p pBuf,
                           mng_uint16 i);
#else /* MNG_BIGENDIAN_SUPPORTED */
#define mng_get_uint32(P)   *(mng_uint32p)(P)
#define mng_get_int32(P)    *(mng_int32p)(P)
#define mng_get_uint16(P)   *(mng_uint16p)(P)
#define mng_put_uint32(P,I) *(mng_uint32p)(P) = (I)
#define mng_put_int32(P,I)  *(mng_int32p)(P) = (I)
#define mng_put_uint16(P,I) *(mng_uint16p)(P) = (I)
#endif /* MNG_BIGENDIAN_SUPPORTED */

/* ************************************************************************** */
/* *                                                                        * */
/* * Some handy(?) macro definitions                                        * */
/* *                                                                        * */
/* ************************************************************************** */

#define MAX_COORD(a, b)  (((a) > (b)) ? (a) : (b))
#define MIN_COORD(a, b)  (((a) < (b)) ? (a) : (b))

/* ************************************************************************** */

#endif /* _libmng_data_h_ */

/* ************************************************************************** */
/* * end of file                                                            * */
/* ************************************************************************** */