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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.2
// Copyright (C) 2002-2004 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
//----------------------------------------------------------------------------
//
// Class scanline_bin - binary scanline.
//
//----------------------------------------------------------------------------
#ifndef AGG_SCANLINE_BIN_INCLUDED
#define AGG_SCANLINE_BIN_INCLUDED
#include "agg_basics.h"
namespace agg
{
//=============================================================scanline_bin
//
// This is binary scaline container which supports the interface
// used in the rasterizer::render(). See description of agg_scanline_u8
// for details.
//
// Rendering:
//-------------------------------------------------------------------------
//
// int y = sl.y();
//
// ************************************
// ...Perform vertical clipping here...
// ************************************
//
// unsigned num_spans = sl.num_spans();
// const agg::scanline_bin::span* cur_span = sl.spans();
//
// do
// {
// x = cur_span->x;
// len = cur_span->len;
//
// **************************************
// ...Perform horizontal clipping here...
// **************************************
//
// hor_line(x, y, len)
// ++cur_span;
// }
// while(--num_spans);
//
//------------------------------------------------------------------------
class scanline_bin
{
public:
struct span
{
int16 x;
int16 len;
};
typedef const span* const_iterator;
~scanline_bin()
{
delete [] m_spans;
}
scanline_bin() :
m_max_len(0),
m_last_x(0x7FFF),
m_spans(0),
m_cur_span(0)
{
}
void reset(int min_x, int max_x);
void add_cell(int x, unsigned);
void add_cells(int x, unsigned len, const void*);
void add_span(int x, unsigned len, unsigned);
void finalize(int y) { m_y = y; }
void reset_spans();
int y() const { return m_y; }
unsigned num_spans() const { return unsigned(m_cur_span - m_spans); }
const_iterator begin() const { return m_spans + 1; }
private:
scanline_bin(const scanline_bin&);
const scanline_bin operator = (const scanline_bin&);
unsigned m_max_len;
int m_last_x;
int m_y;
span* m_spans;
span* m_cur_span;
};
//------------------------------------------------------------------------
inline void scanline_bin::reset(int min_x, int max_x)
{
unsigned max_len = max_x - min_x + 3;
if(max_len > m_max_len)
{
delete [] m_spans;
m_spans = new span [max_len];
m_max_len = max_len;
}
m_last_x = 0x7FFF;
m_cur_span = m_spans;
}
//------------------------------------------------------------------------
inline void scanline_bin::reset_spans()
{
m_last_x = 0x7FFF;
m_cur_span = m_spans;
}
//------------------------------------------------------------------------
inline void scanline_bin::add_cell(int x, unsigned)
{
if(x == m_last_x+1)
{
m_cur_span->len++;
}
else
{
++m_cur_span;
m_cur_span->x = (int16)x;
m_cur_span->len = 1;
}
m_last_x = x;
}
//------------------------------------------------------------------------
inline void scanline_bin::add_span(int x, unsigned len, unsigned)
{
if(x == m_last_x+1)
{
m_cur_span->len = (int16)(m_cur_span->len + len);
}
else
{
++m_cur_span;
m_cur_span->x = (int16)x;
m_cur_span->len = (int16)len;
}
m_last_x = x + len - 1;
}
//------------------------------------------------------------------------
inline void scanline_bin::add_cells(int x, unsigned len, const void*)
{
add_span(x, len, 0);
}
}
#endif
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