//---------------------------------------------------------------------------- // Anti-Grain Geometry - Version 2.4 // 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 sublixel_scale_e { subpixel_shift = SubpixelShift, subpixel_scale = 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 = iround(x * subpixel_scale) + subpixel_scale; 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_scale) + len, m_src_y, len); m_pos = 0; } m_src_x += subpixel_scale; ++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