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