Function msTileSetup

maptile.c:236–324

* msTileSetup * * * * Called from mapserv.c, this is where the fun begins * * Set up projections and test the parameters for legality. * ************************************************************************/

 *  Set up projections and test the parameters for legality.            *
 ************************************************************************/
int msTileSetup(mapservObj* msObj) {
#ifdef USE_TILE_API 

  char *outProjStr = NULL;
  tileParams params;
  
  /*
  ** Load the metatiling information from the map file.
  */
  msTileGetParams(msObj->map, &params);

  /* 
  ** Ensure all the LAYERs have a projection. 
  */  
  if( msTileSetProjections(msObj->map) != 0 ) {
    return(MS_FAILURE);
  }

  /* 
  ** Set the projection string for this mode. 
  */
  if( msObj->TileMode == TILE_GMAP || msObj->TileMode == TILE_VE ) {
    outProjStr = SPHEREMERC_PROJ4;
  } else {
    return MS_FAILURE; /* Huh? No mode? */
  }
  if( msLoadProjectionString(&(msObj->map->projection), outProjStr) != 0 ) {
    msSetError(MS_CGIERR, "Unable to load projection string.", "msTileSetup()");
    return MS_FAILURE;
  }
  
  /*
  ** Set up the output extents for this tilemode and tile coordinates 
  */
  if( msObj->TileMode == TILE_GMAP ) {

    int x, y, zoom;
    double zoomfactor;
    
    if( msObj->TileCoords ) {
      if( msTileGetGMapCoords(msObj->TileCoords, &x, &y, &zoom) == MS_FAILURE )
        return MS_FAILURE;
    } 
    else {
      msSetError(MS_WEBERR, "Tile parameter not set.", "msTileSetup()");
      return MS_FAILURE;
    }
    
    if( params.metatile_level >= zoom ) {
      msTileResetMetatileLevel(msObj->map);
    }
    
    zoomfactor = pow(2.0, (double)zoom);
    
    /*
    ** Check the input request for sanity.
    */
    if( x >= zoomfactor || y >= zoomfactor ) {