295 lines
9.6 KiB
C++
295 lines
9.6 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_PATH_STORAGE_INTEGER_INCLUDED
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#define AGG_PATH_STORAGE_INTEGER_INCLUDED
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#include <cstring>
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#include "agg_array.h"
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namespace agg
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{
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//---------------------------------------------------------vertex_integer
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template<class T, unsigned CoordShift=6> struct vertex_integer
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{
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enum path_cmd
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{
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cmd_move_to = 0,
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cmd_line_to = 1,
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cmd_curve3 = 2,
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cmd_curve4 = 3
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};
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enum coord_scale_e
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{
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coord_shift = CoordShift,
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coord_scale = 1 << coord_shift
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};
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T x,y;
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vertex_integer() {}
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vertex_integer(T x_, T y_, unsigned flag) :
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x(((x_ << 1) & ~1) | (flag & 1)),
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y(((y_ << 1) & ~1) | (flag >> 1)) {}
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unsigned vertex(double* x_, double* y_,
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double dx=0, double dy=0,
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double scale=1.0) const
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{
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*x_ = dx + (double(x >> 1) / coord_scale) * scale;
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*y_ = dy + (double(y >> 1) / coord_scale) * scale;
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switch(((y & 1) << 1) | (x & 1))
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{
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case cmd_move_to: return path_cmd_move_to;
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case cmd_line_to: return path_cmd_line_to;
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case cmd_curve3: return path_cmd_curve3;
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case cmd_curve4: return path_cmd_curve4;
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}
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return path_cmd_stop;
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}
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};
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//---------------------------------------------------path_storage_integer
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template<class T, unsigned CoordShift=6> class path_storage_integer
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{
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public:
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typedef T value_type;
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typedef vertex_integer<T, CoordShift> vertex_integer_type;
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//--------------------------------------------------------------------
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path_storage_integer() : m_storage(), m_vertex_idx(0), m_closed(true) {}
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//--------------------------------------------------------------------
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void remove_all() { m_storage.remove_all(); }
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//--------------------------------------------------------------------
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void move_to(T x, T y)
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{
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m_storage.add(vertex_integer_type(x, y, vertex_integer_type::cmd_move_to));
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}
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//--------------------------------------------------------------------
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void line_to(T x, T y)
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{
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m_storage.add(vertex_integer_type(x, y, vertex_integer_type::cmd_line_to));
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}
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//--------------------------------------------------------------------
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void curve3(T x_ctrl, T y_ctrl,
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T x_to, T y_to)
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{
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m_storage.add(vertex_integer_type(x_ctrl, y_ctrl, vertex_integer_type::cmd_curve3));
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m_storage.add(vertex_integer_type(x_to, y_to, vertex_integer_type::cmd_curve3));
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}
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//--------------------------------------------------------------------
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void curve4(T x_ctrl1, T y_ctrl1,
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T x_ctrl2, T y_ctrl2,
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T x_to, T y_to)
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{
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m_storage.add(vertex_integer_type(x_ctrl1, y_ctrl1, vertex_integer_type::cmd_curve4));
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m_storage.add(vertex_integer_type(x_ctrl2, y_ctrl2, vertex_integer_type::cmd_curve4));
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m_storage.add(vertex_integer_type(x_to, y_to, vertex_integer_type::cmd_curve4));
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}
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//--------------------------------------------------------------------
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void close_polygon() {}
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//--------------------------------------------------------------------
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unsigned size() const { return m_storage.size(); }
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unsigned vertex(unsigned idx, double* x, double* y) const
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{
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return m_storage[idx].vertex(x, y);
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}
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//--------------------------------------------------------------------
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unsigned byte_size() const { return m_storage.size() * sizeof(vertex_integer_type); }
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void serialize(int8u* ptr) const
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{
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unsigned i;
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for(i = 0; i < m_storage.size(); i++)
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{
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memcpy(ptr, &m_storage[i], sizeof(vertex_integer_type));
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ptr += sizeof(vertex_integer_type);
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}
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}
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//--------------------------------------------------------------------
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void rewind(unsigned)
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{
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m_vertex_idx = 0;
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m_closed = true;
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}
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//--------------------------------------------------------------------
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unsigned vertex(double* x, double* y)
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{
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if(m_storage.size() < 2 || m_vertex_idx > m_storage.size())
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{
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*x = 0;
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*y = 0;
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return path_cmd_stop;
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}
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if(m_vertex_idx == m_storage.size())
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{
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*x = 0;
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*y = 0;
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++m_vertex_idx;
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return path_cmd_end_poly | path_flags_close;
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}
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unsigned cmd = m_storage[m_vertex_idx].vertex(x, y);
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if(is_move_to(cmd) && !m_closed)
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{
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*x = 0;
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*y = 0;
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m_closed = true;
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return path_cmd_end_poly | path_flags_close;
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}
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m_closed = false;
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++m_vertex_idx;
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return cmd;
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}
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//--------------------------------------------------------------------
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rect_d bounding_rect() const
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{
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rect_d bounds(1e100, 1e100, -1e100, -1e100);
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if(m_storage.size() == 0)
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{
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bounds.x1 = bounds.y1 = bounds.x2 = bounds.y2 = 0.0;
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}
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else
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{
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unsigned i;
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for(i = 0; i < m_storage.size(); i++)
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{
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double x, y;
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m_storage[i].vertex(&x, &y);
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if(x < bounds.x1) bounds.x1 = x;
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if(y < bounds.y1) bounds.y1 = y;
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if(x > bounds.x2) bounds.x2 = x;
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if(y > bounds.y2) bounds.y2 = y;
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}
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}
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return bounds;
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}
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private:
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pod_bvector<vertex_integer_type, 6> m_storage;
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unsigned m_vertex_idx;
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bool m_closed;
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};
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//-----------------------------------------serialized_integer_path_adaptor
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template<class T, unsigned CoordShift=6> class serialized_integer_path_adaptor
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{
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public:
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typedef vertex_integer<T, CoordShift> vertex_integer_type;
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//--------------------------------------------------------------------
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serialized_integer_path_adaptor() :
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m_data(0),
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m_end(0),
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m_ptr(0),
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m_dx(0.0),
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m_dy(0.0),
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m_scale(1.0),
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m_vertices(0)
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{}
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//--------------------------------------------------------------------
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serialized_integer_path_adaptor(const int8u* data, unsigned size,
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double dx, double dy) :
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m_data(data),
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m_end(data + size),
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m_ptr(data),
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m_dx(dx),
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m_dy(dy),
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m_vertices(0)
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{}
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//--------------------------------------------------------------------
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void init(const int8u* data, unsigned size,
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double dx, double dy, double scale=1.0)
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{
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m_data = data;
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m_end = data + size;
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m_ptr = data;
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m_dx = dx;
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m_dy = dy;
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m_scale = scale;
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m_vertices = 0;
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}
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//--------------------------------------------------------------------
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void rewind(unsigned)
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{
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m_ptr = m_data;
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m_vertices = 0;
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}
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//--------------------------------------------------------------------
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unsigned vertex(double* x, double* y)
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{
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if(m_data == 0 || m_ptr > m_end)
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{
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*x = 0;
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*y = 0;
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return path_cmd_stop;
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}
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if(m_ptr == m_end)
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{
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*x = 0;
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*y = 0;
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m_ptr += sizeof(vertex_integer_type);
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return path_cmd_end_poly | path_flags_close;
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}
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vertex_integer_type v;
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memcpy(&v, m_ptr, sizeof(vertex_integer_type));
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unsigned cmd = v.vertex(x, y, m_dx, m_dy, m_scale);
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if(is_move_to(cmd) && m_vertices > 2)
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{
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*x = 0;
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*y = 0;
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m_vertices = 0;
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return path_cmd_end_poly | path_flags_close;
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}
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++m_vertices;
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m_ptr += sizeof(vertex_integer_type);
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return cmd;
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}
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private:
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const int8u* m_data;
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const int8u* m_end;
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const int8u* m_ptr;
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double m_dx;
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double m_dy;
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double m_scale;
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unsigned m_vertices;
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};
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}
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#endif
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