Imported healpix tree

external/healpix/Healpix_cxx/healpix_map_fitsio.cc

@@ -0,0 +1,144 @@
+/*
+ *  This file is part of Healpix_cxx.
+ *
+ *  Healpix_cxx is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Healpix_cxx is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Healpix_cxx; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *  For more information about HEALPix, see http://healpix.jpl.nasa.gov
+ */
+
+/*
+ *  Healpix_cxx is being developed at the Max-Planck-Institut fuer Astrophysik
+ *  and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
+ *  (DLR).
+ */
+
+/*
+ *  Copyright (C) 2003-2010 Max-Planck-Society
+ *  Author: Martin Reinecke
+ */
+
+#include "healpix_map_fitsio.h"
+#include "healpix_map.h"
+#include "fitshandle.h"
+
+using namespace std;
+
+namespace {
+
+unsigned int healpix_repcount (tsize npix)
+  {
+  if (npix<1024) return 1;
+  if ((npix%1024)==0) return 1024;
+  return isqrt (npix/12);
+  }
+
+} // unnamed namespace
+
+template<typename T> void read_Healpix_map_from_fits
+  (fitshandle &inp, Healpix_Map<T> &map, int colnum)
+  {
+  arr<T> myarr;
+  inp.read_entire_column (colnum, myarr);
+  int64 nside = inp.get_key<int>("NSIDE");
+  planck_assert (int64(myarr.size())==12*nside*nside,
+    string("mismatch between number of map pixels ("
+    +dataToString(myarr.size())+") and Nside ("+dataToString(nside)+")"));
+  map.Set (myarr, string2HealpixScheme(inp.get_key<string>("ORDERING")));
+  }
+
+template void read_Healpix_map_from_fits (fitshandle &inp,
+  Healpix_Map<float> &map, int colnum);
+template void read_Healpix_map_from_fits (fitshandle &inp,
+  Healpix_Map<double> &map, int colnum);
+template void read_Healpix_map_from_fits (fitshandle &inp,
+  Healpix_Map<int> &map, int colnum);
+
+
+template<typename T> void read_Healpix_map_from_fits
+  (const string &filename, Healpix_Map<T> &map, int colnum, int hdunum)
+  {
+  fitshandle inp;
+  inp.open (filename);
+  inp.goto_hdu (hdunum);
+  read_Healpix_map_from_fits (inp,map,colnum);
+  }
+
+template void read_Healpix_map_from_fits (const string &filename,
+  Healpix_Map<float> &map, int colnum, int hdunum);
+template void read_Healpix_map_from_fits (const string &filename,
+  Healpix_Map<double> &map, int colnum, int hdunum);
+template void read_Healpix_map_from_fits (const string &filename,
+  Healpix_Map<int> &map, int colnum, int hdunum);
+
+
+void prepare_Healpix_fitsmap
+  (fitshandle &out, const Healpix_Base &base, PDT datatype,
+  const arr<string> &colname)
+  {
+  vector<fitscolumn> cols;
+  int repcount = healpix_repcount (base.Npix());
+  for (tsize m=0; m<colname.size(); ++m)
+    cols.push_back (fitscolumn (colname[m],"unknown",repcount, datatype));
+  out.insert_bintab(cols);
+  out.set_key ("PIXTYPE",string("HEALPIX"),"HEALPIX pixelisation");
+  string ordering = (base.Scheme()==RING) ? "RING" : "NESTED";
+  out.set_key ("ORDERING",ordering,
+                  "Pixel ordering scheme, either RING or NESTED");
+  out.set_key ("NSIDE",base.Nside(),"Resolution parameter for HEALPIX");
+  out.set_key ("FIRSTPIX",0,"First pixel # (0 based)");
+  out.set_key ("LASTPIX",base.Npix()-1,"Last pixel # (0 based)");
+  out.set_key ("INDXSCHM",string("IMPLICIT"),
+                  "Indexing: IMPLICIT or EXPLICIT");
+  }
+
+template<typename T> void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<T> &map, PDT datatype)
+  {
+  arr<string> colname(1);
+  colname[0] = "signal";
+  prepare_Healpix_fitsmap (out, map, datatype, colname);
+  out.write_column(1,map.Map());
+  }
+
+template void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<float> &map, PDT datatype);
+template void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<double> &map, PDT datatype);
+template void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<int> &map, PDT datatype);
+
+
+template<typename T> void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<T> &mapT,
+   const Healpix_Map<T> &mapQ, const Healpix_Map<T> &mapU, PDT datatype)
+  {
+  arr<string> colname(3);
+  colname[0] = "signal";
+  colname[1] = "Q-pol";
+  colname[2] = "U-pol";
+  prepare_Healpix_fitsmap (out, mapT, datatype, colname);
+  out.write_column(1,mapT.Map());
+  out.write_column(2,mapQ.Map());
+  out.write_column(3,mapU.Map());
+  }
+
+template void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<float> &mapT,
+   const Healpix_Map<float> &mapQ, const Healpix_Map<float> &mapU,
+   PDT datatype);
+template void write_Healpix_map_to_fits
+  (fitshandle &out, const Healpix_Map<double> &mapT,
+   const Healpix_Map<double> &mapQ, const Healpix_Map<double> &mapU,
+   PDT datatype);