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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_PATH_STORAGE_INCLUDED
#define AGG_PATH_STORAGE_INCLUDED
#include "agg_basics.h"
namespace agg
{
class path_storage
{
enum block_scale_e {
block_shift = 8,
block_size = 1 << block_shift,
block_mask = block_size - 1,
block_pool = 256
};
public:
class vertex_source
{
public:
vertex_source() {}
vertex_source(const path_storage& p) : m_path(&p), m_vertex_idx(0) {}
void rewind(unsigned path_id)
{
m_vertex_idx = path_id;
}
unsigned vertex(FX_FLOAT* x, FX_FLOAT* y)
{
return (m_vertex_idx < m_path->total_vertices())
? m_path->vertex(m_vertex_idx++, x, y)
: static_cast<unsigned>(path_cmd_stop);
}
private:
const path_storage* m_path;
unsigned m_vertex_idx;
};
~path_storage();
path_storage();
unsigned last_vertex(FX_FLOAT* x, FX_FLOAT* y) const;
unsigned prev_vertex(FX_FLOAT* x, FX_FLOAT* y) const;
void move_to(FX_FLOAT x, FX_FLOAT y);
void line_to(FX_FLOAT x, FX_FLOAT y);
void curve4(FX_FLOAT x_ctrl1, FX_FLOAT y_ctrl1,
FX_FLOAT x_ctrl2, FX_FLOAT y_ctrl2,
FX_FLOAT x_to, FX_FLOAT y_to);
template<class VertexSource>
void add_path(VertexSource& vs,
unsigned path_id = 0,
bool solid_path = true)
{
FX_FLOAT x, y;
unsigned cmd;
vs.rewind(path_id);
while(!is_stop(cmd = vs.vertex(&x, &y))) {
if(is_move_to(cmd) && solid_path && m_total_vertices) {
cmd = path_cmd_line_to;
}
add_vertex(x, y, cmd);
}
}
template<class VertexSource>
void add_path_curve(VertexSource& vs,
unsigned path_id = 0,
bool solid_path = true)
{
FX_FLOAT x, y;
unsigned cmd;
int flag;
vs.rewind(path_id);
while(!is_stop(cmd = vs.vertex_curve_flag(&x, &y, flag))) {
if(is_move_to(cmd) && solid_path && m_total_vertices) {
cmd = path_cmd_line_to | flag;
}
add_vertex(x, y, cmd | flag);
}
}
unsigned total_vertices() const
{
return m_total_vertices;
}
unsigned vertex(unsigned idx, FX_FLOAT* x, FX_FLOAT* y) const
{
unsigned nb = idx >> block_shift;
const FX_FLOAT* pv = m_coord_blocks[nb] + ((idx & block_mask) << 1);
*x = *pv++;
*y = *pv;
return m_cmd_blocks[nb][idx & block_mask];
}
unsigned command(unsigned idx) const
{
return m_cmd_blocks[idx >> block_shift][idx & block_mask];
}
unsigned getflag(unsigned idx) const
{
return m_cmd_blocks[idx >> block_shift][idx & block_mask] & path_flags_jr;
}
void rewind(unsigned path_id);
unsigned vertex(FX_FLOAT* x, FX_FLOAT* y);
void add_vertex(FX_FLOAT x, FX_FLOAT y, unsigned cmd);
void end_poly();
private:
void allocate_block(unsigned nb);
unsigned char* storage_ptrs(FX_FLOAT** xy_ptr);
private:
unsigned m_total_vertices;
unsigned m_total_blocks;
unsigned m_max_blocks;
FX_FLOAT** m_coord_blocks;
unsigned char** m_cmd_blocks;
unsigned m_iterator;
};
inline unsigned path_storage::vertex(FX_FLOAT* x, FX_FLOAT* y)
{
if(m_iterator >= m_total_vertices) {
return path_cmd_stop;
}
return vertex(m_iterator++, x, y);
}
inline unsigned path_storage::prev_vertex(FX_FLOAT* x, FX_FLOAT* y) const
{
if(m_total_vertices > 1) {
return vertex(m_total_vertices - 2, x, y);
}
return path_cmd_stop;
}
inline unsigned path_storage::last_vertex(FX_FLOAT* x, FX_FLOAT* y) const
{
if(m_total_vertices) {
return vertex(m_total_vertices - 1, x, y);
}
return path_cmd_stop;
}
inline unsigned char* path_storage::storage_ptrs(FX_FLOAT** xy_ptr)
{
unsigned nb = m_total_vertices >> block_shift;
if(nb >= m_total_blocks) {
allocate_block(nb);
}
*xy_ptr = m_coord_blocks[nb] + ((m_total_vertices & block_mask) << 1);
return m_cmd_blocks[nb] + (m_total_vertices & block_mask);
}
inline void path_storage::add_vertex(FX_FLOAT x, FX_FLOAT y, unsigned cmd)
{
FX_FLOAT* coord_ptr = 0;
unsigned char* cmd_ptr = storage_ptrs(&coord_ptr);
*cmd_ptr = (unsigned char)cmd;
*coord_ptr++ = x;
*coord_ptr = y;
m_total_vertices++;
}
inline void path_storage::move_to(FX_FLOAT x, FX_FLOAT y)
{
add_vertex(x, y, path_cmd_move_to);
}
inline void path_storage::line_to(FX_FLOAT x, FX_FLOAT y)
{
add_vertex(x, y, path_cmd_line_to);
}
}
#endif
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