libmng_hlapi.c

Linux下的基于X11的图形开发环境。

{
  mng_datap   pData;                   /* local vars */
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_READ, MNG_LC_START)
#endif

  MNG_VALIDHANDLE (hHandle)            /* check validity handle and callbacks */
  pData = ((mng_datap)hHandle);        /* and make it addressable */

#ifndef MNG_INTERNAL_MEMMNGMT
  MNG_VALIDCB (hHandle, fMemalloc)
  MNG_VALIDCB (hHandle, fMemfree)
#endif

  MNG_VALIDCB (hHandle, fOpenstream)
  MNG_VALIDCB (hHandle, fClosestream)
  MNG_VALIDCB (hHandle, fReaddata)

#ifdef MNG_SUPPORT_DISPLAY             /* valid at this point ? */
  if ((pData->bReading) || (pData->bDisplaying))
#else
  if (pData->bReading)
#endif
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)

#ifdef MNG_SUPPORT_WRITE
  if ((pData->bWriting) || (pData->bCreating))
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
#endif

  if (!pData->bCacheplayback)          /* must store playback info to work!! */
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)

  cleanup_errors (pData);              /* cleanup previous errors */

  pData->bReading = MNG_TRUE;          /* read only! */

  if (!pData->fOpenstream (hHandle))   /* open it and start reading */
    iRetcode = MNG_APPIOERROR;
  else
    iRetcode = read_graphic (pData);

  if (pData->bEOF)                     /* already at EOF ? */
  {
    pData->bReading = MNG_FALSE;       /* then we're no longer reading */
    
#ifdef MNG_SUPPORT_DISPLAY
    mng_reset_rundata (pData);         /* reset rundata */
#endif
  }

  if (iRetcode)                        /* on error bail out */
    return iRetcode;

  if (pData->bSuspended)               /* read suspension ? */
  {
     iRetcode            = MNG_NEEDMOREDATA;
     pData->iSuspendtime = pData->fGettickcount ((mng_handle)pData);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_READ, MNG_LC_END)
#endif

  return iRetcode;
}
#endif /* MNG_SUPPORT_READ */

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

#ifdef MNG_SUPPORT_READ
mng_retcode MNG_DECL mng_read_resume (mng_handle hHandle)
{
  mng_datap   pData;                   /* local vars */
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_READ_RESUME, MNG_LC_START)
#endif

  MNG_VALIDHANDLE (hHandle)            /* check validity handle */
  pData = ((mng_datap)hHandle);        /* and make it addressable */
                                       /* can we expect this call ? */
  if ((!pData->bReading) || (!pData->bSuspended))
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)

  cleanup_errors (pData);              /* cleanup previous errors */

  pData->bSuspended = MNG_FALSE;       /* reset the flag */

#ifdef MNG_SUPPORT_DISPLAY             /* re-synchronize ? */
  if ((pData->bDisplaying) && (pData->bRunning))
    pData->iSynctime  = pData->iSynctime - pData->iSuspendtime +
                        pData->fGettickcount (hHandle);
#endif

  iRetcode = read_graphic (pData);     /* continue reading now */

  if (pData->bEOF)                     /* at EOF ? */
  {
    pData->bReading = MNG_FALSE;       /* then we're no longer reading */
    
#ifdef MNG_SUPPORT_DISPLAY
    mng_reset_rundata (pData);         /* reset rundata */
#endif
  }

  if (iRetcode)                        /* on error bail out */
    return iRetcode;

  if (pData->bSuspended)               /* read suspension ? */
  {
     iRetcode            = MNG_NEEDMOREDATA;
     pData->iSuspendtime = pData->fGettickcount ((mng_handle)pData);
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_READ_RESUME, MNG_LC_END)
#endif

  return iRetcode;
}
#endif /* MNG_SUPPORT_READ */

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

#ifdef MNG_SUPPORT_WRITE
mng_retcode MNG_DECL mng_write (mng_handle hHandle)
{
  mng_datap   pData;
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_WRITE, MNG_LC_START)
#endif

  MNG_VALIDHANDLE (hHandle)            /* check validity handle and callbacks */
  pData = ((mng_datap)hHandle);        /* and make it addressable */

#ifndef MNG_INTERNAL_MEMMNGMT
  MNG_VALIDCB (hHandle, fMemalloc)
  MNG_VALIDCB (hHandle, fMemfree)
#endif

  MNG_VALIDCB (hHandle, fOpenstream)
  MNG_VALIDCB (hHandle, fClosestream)
  MNG_VALIDCB (hHandle, fWritedata)

#ifdef MNG_SUPPORT_READ
  if (pData->bReading)                 /* valid at this point ? */
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
#endif

  if (pData->bCreating)                /* can't write while it's still being made! */
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)

  cleanup_errors (pData);              /* cleanup previous errors */

  iRetcode = write_graphic (pData);    /* do the write */

  if (iRetcode)                        /* on error bail out */
    return iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_WRITE, MNG_LC_END)
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SUPPORT_WRITE */

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

#ifdef MNG_SUPPORT_WRITE
mng_retcode MNG_DECL mng_create (mng_handle hHandle)
{
  mng_datap   pData;
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_CREATE, MNG_LC_START)
#endif

  MNG_VALIDHANDLE (hHandle)            /* check validity handle and callbacks */
  pData = ((mng_datap)hHandle);        /* and make it addressable */

#ifndef MNG_INTERNAL_MEMMNGMT
  MNG_VALIDCB (hHandle, fMemalloc)
  MNG_VALIDCB (hHandle, fMemfree)
#endif

#ifdef MNG_SUPPORT_READ
  if (pData->bReading)                 /* valid at this point ? */
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
#endif

  if ((pData->bWriting) || (pData->bCreating))
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)

  cleanup_errors (pData);              /* cleanup previous errors */

  iRetcode = mng_reset (hHandle);      /* clear any previous stuff */

  if (iRetcode)                        /* on error bail out */
    return iRetcode;

  pData->bCreating = MNG_TRUE;         /* indicate we're creating a new file */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_CREATE, MNG_LC_END)
#endif

  return MNG_NOERROR;
}
#endif /* MNG_SUPPORT_WRITE */

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

#if defined(MNG_SUPPORT_DISPLAY) && defined(MNG_SUPPORT_READ)
mng_retcode MNG_DECL mng_readdisplay (mng_handle hHandle)
{
  mng_datap   pData;                   /* local vars */
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_READDISPLAY, MNG_LC_START)
#endif

  MNG_VALIDHANDLE (hHandle)            /* check validity handle and callbacks */
  pData = ((mng_datap)hHandle);        /* and make it addressable */

#ifndef MNG_INTERNAL_MEMMNGMT
  MNG_VALIDCB (hHandle, fMemalloc)
  MNG_VALIDCB (hHandle, fMemfree)
#endif

  MNG_VALIDCB (hHandle, fReaddata)
  MNG_VALIDCB (hHandle, fGetcanvasline)
  MNG_VALIDCB (hHandle, fRefresh)
  MNG_VALIDCB (hHandle, fGettickcount)
  MNG_VALIDCB (hHandle, fSettimer)
                                       /* valid at this point ? */
  if ((pData->bReading) || (pData->bDisplaying))
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)

#ifdef MNG_SUPPORT_WRITE
  if ((pData->bWriting) || (pData->bCreating))
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
#endif

  cleanup_errors (pData);              /* cleanup previous errors */

  pData->bReading      = MNG_TRUE;     /* read & display! */
  pData->bDisplaying   = MNG_TRUE;
  pData->bRunning      = MNG_TRUE;
  pData->iFrameseq     = 0;
  pData->iLayerseq     = 0;
  pData->iFrametime    = 0;
  pData->iRequestframe = 0;
  pData->iRequestlayer = 0;
  pData->iRequesttime  = 0;
  pData->bSearching    = MNG_FALSE;
  pData->iRuntime      = 0;
  pData->iSynctime     = pData->fGettickcount (hHandle);
  pData->iSuspendtime  = 0;
  pData->iStarttime    = pData->iSynctime;
  pData->iEndtime      = 0;

  if (!pData->fOpenstream (hHandle))   /* open it and start reading */
    iRetcode = MNG_APPIOERROR;
  else
    iRetcode = read_graphic (pData);

  if (pData->bEOF)                     /* already at EOF ? */
  {
    pData->bReading = MNG_FALSE;       /* then we're no longer reading */
    drop_invalid_objects (pData);      /* drop invalidly stored objects */
  }
  
  if (iRetcode)                        /* on error bail out */
    return iRetcode;

  if (pData->bSuspended)               /* read suspension ? */
  {
     iRetcode            = MNG_NEEDMOREDATA;
     pData->iSuspendtime = pData->fGettickcount ((mng_handle)pData);
  }
  else
  if (pData->bTimerset)                /* indicate timer break ? */
    iRetcode = MNG_NEEDTIMERWAIT;
  else
  if (pData->bSectionwait)             /* indicate section break ? */
    iRetcode = MNG_NEEDSECTIONWAIT;
  else
    pData->bRunning = MNG_FALSE;       /* no breaks = end of run */

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_READDISPLAY, MNG_LC_END)
#endif

  return iRetcode;
}
#endif /* MNG_SUPPORT_DISPLAY && MNG_SUPPORT_READ */

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

#ifdef MNG_SUPPORT_DISPLAY
mng_retcode MNG_DECL mng_display (mng_handle hHandle)
{
  mng_datap   pData;                   /* local vars */
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (((mng_datap)hHandle), MNG_FN_DISPLAY, MNG_LC_START)
#endif

  MNG_VALIDHANDLE (hHandle)            /* check validity handle and callbacks */
  pData = ((mng_datap)hHandle);        /* and make it addressable */

#ifndef MNG_INTERNAL_MEMMNGMT
  MNG_VALIDCB (hHandle, fMemalloc)
  MNG_VALIDCB (hHandle, fMemfree)
#endif

  MNG_VALIDCB (hHandle, fGetcanvasline)
  MNG_VALIDCB (hHandle, fRefresh)
  MNG_VALIDCB (hHandle, fGettickcount)
  MNG_VALIDCB (hHandle, fSettimer)

  if (pData->bDisplaying)              /* valid at this point ? */
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
    
#ifdef MNG_SUPPORT_READ
  if (pData->bReading)
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
#endif

#ifdef MNG_SUPPORT_WRITE
  if ((pData->bWriting) || (pData->bCreating))
    MNG_ERROR (pData, MNG_FUNCTIONINVALID)
#endif

  cleanup_errors (pData);              /* cleanup previous errors */

  pData->bDisplaying   = MNG_TRUE;     /* display! */
  pData->bRunning      = MNG_TRUE;
  pData->iFrameseq     = 0;
  pData->iLayerseq     = 0;
  pData->iFrametime    = 0;
  pData->iRequestframe = 0;