VHierarchyWindow.cc

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//=============================================================================
//
//  CLASS newClass - IMPLEMENTATION
//
//=============================================================================
 
 
//== INCLUDES =================================================================
 
#include <OpenMesh/Tools/VDPM/VHierarchyWindow.hh>
 
#include <cstring>
 
#ifndef WIN32
#else
  #if defined(__MINGW32__)
    #include <stdlib.h>
    #include <string.h>
  #endif
#endif
 
//== NAMESPACES ===============================================================
 
namespace OpenMesh {
namespace VDPM {
 
 
//== IMPLEMENTATION ========================================================== 
 
 
VHierarchyWindow::
VHierarchyWindow() :
  vhierarchy_(nullptr), buffer_(nullptr),buffer_min_ (0), buffer_max_(0), current_pos_(0) , window_min_(0), window_max_(0),  n_shift_(0)
{
 
}
 
 
VHierarchyWindow::
VHierarchyWindow(VHierarchy &_vhierarchy) :
  vhierarchy_(&_vhierarchy),buffer_(nullptr),buffer_min_ (0), buffer_max_(0), current_pos_(0) , window_min_(0), window_max_(0) ,n_shift_(0)
{
}
 
 
VHierarchyWindow::
~VHierarchyWindow(void)
{
  if (buffer_ != nullptr)
    free(buffer_);
}
 
 
bool
VHierarchyWindow::
update_buffer(VHierarchyNodeHandle _node_handle)
{
  if (underflow(_node_handle) != true && overflow(_node_handle) != true)
    return  false;
 
  // tightly update window_min_ & window_max_
  int none_zero_pos;
  for (none_zero_pos=int(buffer_size()-1); none_zero_pos >= 0; --none_zero_pos)
  {
    if (buffer_[none_zero_pos] != 0)  break;
  }
  window_max_ = buffer_min_ + none_zero_pos + 1;
  for(none_zero_pos=0; none_zero_pos < int(buffer_size()); ++none_zero_pos)
  {
    if (buffer_[none_zero_pos] != 0)  break;
  }
  window_min_ = buffer_min_ + none_zero_pos;  
  
  assert(window_min_ < window_max_);
  
  while (underflow(_node_handle) == true)   buffer_min_ /= 2;
  while (overflow(_node_handle) == true)
  {
    buffer_max_ *= 2;
    if (buffer_max_ > vhierarchy_->num_nodes() / 8)
      buffer_max_ = 1 + vhierarchy_->num_nodes() / 8;
  }
  
  unsigned char *new_buffer = static_cast<unsigned char *>(malloc(buffer_size()));
  memset(new_buffer, 0, buffer_size());
  memcpy(&(new_buffer[window_min_-buffer_min_]), 
         &(buffer_[none_zero_pos]), 
         window_size());
  free(buffer_);
  buffer_ = new_buffer;
 
  return  true;
}
 
void
VHierarchyWindow::init(VHierarchyNodeHandleContainer &_roots)
{
  if (buffer_ != nullptr)
    free(buffer_);
 
  buffer_min_ = 0;
  buffer_max_ = _roots.size() / 8;
  if (_roots.size() % 8 > 0)
    ++buffer_max_;
 
  buffer_ = static_cast<unsigned char *>(malloc(buffer_size()));
  memset(buffer_, 0, buffer_size());
 
  window_min_ = 0;
  window_max_= 0;
  current_pos_ = 0;
  n_shift_ = 0;
  
  for (unsigned int i=0; i<_roots.size(); i++)
  {
    activate(VHierarchyNodeHandle((int) i));
  }
}
 
 
void
VHierarchyWindow::
update_with_vsplit(VHierarchyNodeHandle _parent_handle)
{
  VHierarchyNodeHandle  
    lchild_handle = vhierarchy_->lchild_handle(_parent_handle),
    rchild_handle = vhierarchy_->rchild_handle(_parent_handle);
 
  assert(is_active(_parent_handle) == true);
  assert(is_active(lchild_handle) != true);
  assert(is_active(rchild_handle) != true);
 
  inactivate(_parent_handle);
  activate(rchild_handle);
  activate(lchild_handle);
}
 
void
VHierarchyWindow::
update_with_ecol(VHierarchyNodeHandle _parent_handle)
{
  VHierarchyNodeHandle 
    lchild_handle = vhierarchy_->lchild_handle(_parent_handle),
    rchild_handle = vhierarchy_->rchild_handle(_parent_handle);
 
  assert(is_active(_parent_handle) != true);
  assert(is_active(lchild_handle) == true);
  assert(is_active(rchild_handle) == true);
  
  activate(_parent_handle);
  inactivate(rchild_handle);
  inactivate(lchild_handle);
}
 
//=============================================================================
} // namespace VDPM
} // namespace OpenMesh
//=============================================================================