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//----------------------------------------------------------------------------
// 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
//----------------------------------------------------------------------------
//
// Class scanline_bin - binary scanline.
//
//----------------------------------------------------------------------------
//
// Adaptation for 32-bit screen coordinates (scanline32_bin) has been sponsored by
// Liberty Technology Systems, Inc., visit http://lib-sys.com
//
// Liberty Technology Systems, Inc. is the provider of
// PostScript and PDF technology for software developers.
//
//----------------------------------------------------------------------------
#ifndef AGG_SCANLINE_BIN_INCLUDED
#define AGG_SCANLINE_BIN_INCLUDED
#include "agg_array.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.
//
//------------------------------------------------------------------------
class scanline_bin
{
public:
typedef int32 coord_type;
struct span
{
int16 x;
int16 len;
};
typedef const span* const_iterator;
//--------------------------------------------------------------------
scanline_bin() :
m_last_x(0x7FFFFFF0),
m_spans(),
m_cur_span(0)
{
}
//--------------------------------------------------------------------
void reset(int min_x, int max_x)
{
unsigned max_len = max_x - min_x + 3;
if(max_len > m_spans.size())
{
m_spans.resize(max_len);
}
m_last_x = 0x7FFFFFF0;
m_cur_span = &m_spans[0];
}
//--------------------------------------------------------------------
void 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;
}
//--------------------------------------------------------------------
void 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;
}
//--------------------------------------------------------------------
void add_cells(int x, unsigned len, const void*)
{
add_span(x, len, 0);
}
//--------------------------------------------------------------------
void finalize(int y)
{
m_y = y;
}
//--------------------------------------------------------------------
void reset_spans()
{
m_last_x = 0x7FFFFFF0;
m_cur_span = &m_spans[0];
}
//--------------------------------------------------------------------
int y() const { return m_y; }
unsigned num_spans() const { return unsigned(m_cur_span - &m_spans[0]); }
const_iterator begin() const { return &m_spans[1]; }
private:
scanline_bin(const scanline_bin&);
const scanline_bin operator = (const scanline_bin&);
int m_last_x;
int m_y;
pod_array<span> m_spans;
span* m_cur_span;
};
//===========================================================scanline32_bin
class scanline32_bin
{
public:
typedef int32 coord_type;
//--------------------------------------------------------------------
struct span
{
span() {}
span(coord_type x_, coord_type len_) : x(x_), len(len_) {}
coord_type x;
coord_type len;
};
typedef pod_bvector<span, 4> span_array_type;
//--------------------------------------------------------------------
class const_iterator
{
public:
const_iterator(const span_array_type& spans) :
m_spans(spans),
m_span_idx(0)
{}
const span& operator*() const { return m_spans[m_span_idx]; }
const span* operator->() const { return &m_spans[m_span_idx]; }
void operator ++ () { ++m_span_idx; }
private:
const span_array_type& m_spans;
unsigned m_span_idx;
};
//--------------------------------------------------------------------
scanline32_bin() : m_max_len(0), m_last_x(0x7FFFFFF0) {}
//--------------------------------------------------------------------
void reset(int min_x, int max_x)
{
m_last_x = 0x7FFFFFF0;
m_spans.remove_all();
}
//--------------------------------------------------------------------
void add_cell(int x, unsigned)
{
if(x == m_last_x+1)
{
m_spans.last().len++;
}
else
{
m_spans.add(span(coord_type(x), 1));
}
m_last_x = x;
}
//--------------------------------------------------------------------
void add_span(int x, unsigned len, unsigned)
{
if(x == m_last_x+1)
{
m_spans.last().len += coord_type(len);
}
else
{
m_spans.add(span(coord_type(x), coord_type(len)));
}
m_last_x = x + len - 1;
}
//--------------------------------------------------------------------
void add_cells(int x, unsigned len, const void*)
{
add_span(x, len, 0);
}
//--------------------------------------------------------------------
void finalize(int y)
{
m_y = y;
}
//--------------------------------------------------------------------
void reset_spans()
{
m_last_x = 0x7FFFFFF0;
m_spans.remove_all();
}
//--------------------------------------------------------------------
int y() const { return m_y; }
unsigned num_spans() const { return m_spans.size(); }
const_iterator begin() const { return const_iterator(m_spans); }
private:
scanline32_bin(const scanline32_bin&);
const scanline32_bin operator = (const scanline32_bin&);
unsigned m_max_len;
int m_last_x;
int m_y;
span_array_type m_spans;
};
}
#endif
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