142 lines
4.7 KiB
C++
142 lines
4.7 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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#ifndef AGG_SPAN_SUBDIV_ADAPTOR_INCLUDED
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#define AGG_SPAN_SUBDIV_ADAPTOR_INCLUDED
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#include "agg_basics.h"
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namespace agg
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{
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//=================================================span_subdiv_adaptor
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template<class Interpolator, unsigned SubpixelShift = 8>
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class span_subdiv_adaptor
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{
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public:
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typedef Interpolator interpolator_type;
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typedef typename interpolator_type::trans_type trans_type;
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enum sublixel_scale_e
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{
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subpixel_shift = SubpixelShift,
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subpixel_scale = 1 << subpixel_shift
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};
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//----------------------------------------------------------------
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span_subdiv_adaptor() :
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m_subdiv_shift(4),
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m_subdiv_size(1 << m_subdiv_shift),
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m_subdiv_mask(m_subdiv_size - 1) {}
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span_subdiv_adaptor(interpolator_type& interpolator,
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unsigned subdiv_shift = 4) :
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m_subdiv_shift(subdiv_shift),
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m_subdiv_size(1 << m_subdiv_shift),
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m_subdiv_mask(m_subdiv_size - 1),
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m_interpolator(&interpolator) {}
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span_subdiv_adaptor(interpolator_type& interpolator,
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double x, double y, unsigned len,
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unsigned subdiv_shift = 4) :
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m_subdiv_shift(subdiv_shift),
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m_subdiv_size(1 << m_subdiv_shift),
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m_subdiv_mask(m_subdiv_size - 1),
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m_interpolator(&interpolator)
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{
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begin(x, y, len);
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}
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//----------------------------------------------------------------
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const interpolator_type& interpolator() const { return *m_interpolator; }
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void interpolator(interpolator_type& intr) { m_interpolator = &intr; }
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//----------------------------------------------------------------
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const trans_type& transformer() const
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{
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return *m_interpolator->transformer();
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}
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void transformer(const trans_type& trans)
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{
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m_interpolator->transformer(trans);
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}
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//----------------------------------------------------------------
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unsigned subdiv_shift() const { return m_subdiv_shift; }
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void subdiv_shift(unsigned shift)
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{
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m_subdiv_shift = shift;
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m_subdiv_size = 1 << m_subdiv_shift;
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m_subdiv_mask = m_subdiv_size - 1;
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}
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//----------------------------------------------------------------
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void begin(double x, double y, unsigned len)
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{
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m_pos = 1;
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m_src_x = iround(x * subpixel_scale) + subpixel_scale;
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m_src_y = y;
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m_len = len;
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if(len > m_subdiv_size) len = m_subdiv_size;
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m_interpolator->begin(x, y, len);
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}
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//----------------------------------------------------------------
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void operator++()
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{
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++(*m_interpolator);
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if(m_pos >= m_subdiv_size)
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{
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unsigned len = m_len;
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if(len > m_subdiv_size) len = m_subdiv_size;
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m_interpolator->resynchronize(double(m_src_x) / double(subpixel_scale) + len,
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m_src_y,
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len);
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m_pos = 0;
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}
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m_src_x += subpixel_scale;
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++m_pos;
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--m_len;
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}
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//----------------------------------------------------------------
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void coordinates(int* x, int* y) const
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{
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m_interpolator->coordinates(x, y);
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}
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//----------------------------------------------------------------
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void local_scale(int* x, int* y) const
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{
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m_interpolator->local_scale(x, y);
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}
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private:
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unsigned m_subdiv_shift;
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unsigned m_subdiv_size;
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unsigned m_subdiv_mask;
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interpolator_type* m_interpolator;
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int m_src_x;
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double m_src_y;
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unsigned m_pos;
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unsigned m_len;
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};
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}
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#endif
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