1 files changed, 144 insertions, 0 deletions
diff --git a/raslib/miter.icc b/raslib/miter.icc
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+++ b/raslib/miter.icc
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+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community 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 3 of the License, or
+* (at your option) any later version.
+*
+* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+/
+/**
+ * SOURCE: miter.cc
+ *
+ * MODULE: raslib
+ * CLASS:  r_Miter
+ *
+*/
+
+#include "raslib/miter.hh"
+#include "raslib/minterval.hh"
+#include "raslib/rmdebug.hh"
+
+inline
+r_Miter::r_Miter( const r_Minterval* newAreaIter, 
+		  const r_Minterval* newAreaTile, 
+		  r_Bytes newCellSize, const char* newFirstCell ) 
+  : areaIter(newAreaIter), areaTile(newAreaTile), cellSize(newCellSize),
+    firstCell(newFirstCell), done(false)
+{
+  RMDBGENTER(1, RMDebug::module_raslib, "r_Miter", "r_Miter()");
+  // the following initializes incArrIter and calculates the first offset
+  int tIncIter = 1;     // total increment for current dimension
+  int prevTIncIter = 1; // total increment for previous dimension
+  r_Bytes incIter = cellSize; // current increment
+  r_Dimension i;
+  int firstOff = 0;
+
+  RMDBGMIDDLE(2, RMDebug::module_raslib, "r_Miter", "area for iteration: " << *newAreaIter);
+  RMDBGMIDDLE(2, RMDebug::module_raslib, "r_Miter", "whole area: " << *newAreaTile);
+
+  // dimensionality of both areaIter and areaTile
+  r_Dimension dim = areaIter->dimension();
+  // stores the increments
+  incArrIter = new incArrElem[dim];
+
+  for( i=0; i<dim; i++ ) {
+    // in RasDaMan the order of dimensions is the other way round!
+    int r = dim - i - 1;
+    // used for counting in iteration, initialize with 0
+    incArrIter[i].curr = 0;
+    // how often is the increment added?
+    incArrIter[i].repeat = (*areaIter)[r].high() - (*areaIter)[r].low() + 1;
+    RMDBGMIDDLE(4, RMDebug::module_raslib, "r_Miter", "repeat dim " << i << ": " << incArrIter[i].repeat );
+    // the increment for the result tile (higher dimensions calculated 
+    // further down)
+    incArrIter[i].inc = incIter;
+    RMDBGMIDDLE(4, RMDebug::module_raslib, "r_Miter", "incIter dim " << i << ": " << incIter );
+
+    // calculate starting offset and increments for higher dimensions
+    // firstOff is the offset in chars of the first cell
+    firstOff += ((*areaIter)[r].low()-(*areaTile)[r].low()) * prevTIncIter * cellSize;
+    // tInc is the increment if the dimension would be skipped
+    tIncIter = ((*areaTile)[r].high()-(*areaTile)[r].low()+1) * prevTIncIter;
+    // inc is the real increment, after some cells in the dimensions
+    // have been iterated through.
+    incIter = (tIncIter - incArrIter[i].repeat*prevTIncIter) * cellSize;
+    // remember total increment of last dimension
+    prevTIncIter = tIncIter;
+  }
+  firstCell += firstOff;
+  reset();
+  RMDBGEXIT(1, RMDebug::module_raslib, "r_Miter", "r_Miter()");
+}
+
+inline
+r_Miter::~r_Miter() 
+{
+  delete [] incArrIter;
+}
+
+inline void
+r_Miter::reset()
+{
+  currCell = (char*)firstCell;
+  done = false;
+  lowCount = 0;
+  for( r_Dimension i=0; i<areaIter->dimension(); i++ ) {
+    incArrIter[i].curr = 0;
+  }
+}
+
+inline char* 
+r_Miter::nextCell()
+{
+  // return the current cell
+  char* retVal = currCell;
+  r_Dimension i = 0;
+
+  if(done)
+    return retVal;
+  
+  // increment adresses
+  currCell += incArrIter[0].inc;
+  lowCount++;
+  if(lowCount == incArrIter[0].repeat) {
+    lowCount = 0;
+    // increment other dimensions
+    for(i=1; i < areaIter->dimension(); i++) {
+      incArrIter[i].curr++;
+      currCell += incArrIter[i].inc;
+      if(incArrIter[i].curr < incArrIter[i].repeat) {
+	// no overflow in this dimension
+	break;
+      } else {
+	// overflow in this dimension
+	incArrIter[i].curr = 0;
+      }
+    }
+    if( i == areaIter->dimension() ) {
+      // overflow in last dimension
+      done = true;
+      currCell = retVal;
+    }
+  }
+  return retVal;
+}
+
+bool
+r_Miter::isDone()
+{
+  return done;
+}