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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#ifndef AGG_SPAN_SUBDIV_ADAPTOR_INCLUDED
#define AGG_SPAN_SUBDIV_ADAPTOR_INCLUDED
#include "agg_basics.h"
namespace agg
{
//=================================================span_subdiv_adaptor
template<class Interpolator, unsigned SubpixelShift = 8>
class span_subdiv_adaptor
{
public:
typedef Interpolator interpolator_type;
typedef typename interpolator_type::trans_type trans_type;
enum
{
subpixel_shift = SubpixelShift,
subpixel_size = 1 << subpixel_shift
};
//----------------------------------------------------------------
span_subdiv_adaptor() :
m_subdiv_shift(4),
m_subdiv_size(1 << m_subdiv_shift),
m_subdiv_mask(m_subdiv_size - 1) {}
span_subdiv_adaptor(interpolator_type& interpolator,
unsigned subdiv_shift = 4) :
m_subdiv_shift(subdiv_shift),
m_subdiv_size(1 << m_subdiv_shift),
m_subdiv_mask(m_subdiv_size - 1),
m_interpolator(&interpolator) {}
span_subdiv_adaptor(interpolator_type& interpolator,
double x, double y, unsigned len,
unsigned subdiv_shift = 4) :
m_subdiv_shift(subdiv_shift),
m_subdiv_size(1 << m_subdiv_shift),
m_subdiv_mask(m_subdiv_size - 1),
m_interpolator(&interpolator)
{
begin(x, y, len);
}
//----------------------------------------------------------------
const interpolator_type& interpolator() const { return *m_interpolator; }
void interpolator(interpolator_type& intr) { m_interpolator = &intr; }
//----------------------------------------------------------------
const trans_type& transformer() const
{
return *m_interpolator->transformer();
}
void transformer(const trans_type& trans)
{
m_interpolator->transformer(trans);
}
//----------------------------------------------------------------
unsigned subdiv_shift() const { return m_subdiv_shift; }
void subdiv_shift(unsigned shift)
{
m_subdiv_shift = shift;
m_subdiv_size = 1 << m_subdiv_shift;
m_subdiv_mask = m_subdiv_size - 1;
}
//----------------------------------------------------------------
void begin(double x, double y, unsigned len)
{
m_pos = 1;
m_src_x = int(x * subpixel_size) + subpixel_size;
m_src_y = y;
m_len = len;
if(len > m_subdiv_size) len = m_subdiv_size;
m_interpolator->begin(x, y, len);
}
//----------------------------------------------------------------
void operator++()
{
++(*m_interpolator);
if(m_pos >= m_subdiv_size)
{
unsigned len = m_len;
if(len > m_subdiv_size) len = m_subdiv_size;
m_interpolator->resynchronize(double(m_src_x) / double(subpixel_size) + len,
m_src_y,
len);
m_pos = 0;
}
m_src_x += subpixel_size;
++m_pos;
--m_len;
}
//----------------------------------------------------------------
void coordinates(int* x, int* y) const
{
m_interpolator->coordinates(x, y);
}
//----------------------------------------------------------------
void local_scale(int* x, int* y) const
{
m_interpolator->local_scale(x, y);
}
private:
unsigned m_subdiv_shift;
unsigned m_subdiv_size;
unsigned m_subdiv_mask;
interpolator_type* m_interpolator;
int m_src_x;
double m_src_y;
unsigned m_pos;
unsigned m_len;
};
}
#endif
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