/usr/include/mapnik/agg/agg_scanline_storage_bin.h is in libmapnik-dev 2.2.0+ds1-6build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
//----------------------------------------------------------------------------
//
// Adaptation for 32-bit screen coordinates 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_STORAGE_BIN_INCLUDED
#define AGG_SCANLINE_STORAGE_BIN_INCLUDED
#include <cstring>
#include <cstdlib>
#include <cmath>
#include "agg_array.h"
namespace agg
{
//-----------------------------------------------scanline_storage_bin
class scanline_storage_bin
{
public:
//---------------------------------------------------------------
struct span_data
{
int32 x;
int32 len;
};
//---------------------------------------------------------------
struct scanline_data
{
int y;
unsigned num_spans;
unsigned start_span;
};
//---------------------------------------------------------------
class embedded_scanline
{
public:
//-----------------------------------------------------------
class const_iterator
{
public:
const_iterator() : m_storage(0) {}
const_iterator(const embedded_scanline& sl) :
m_storage(sl.m_storage),
m_span_idx(sl.m_scanline.start_span)
{
m_span = m_storage->span_by_index(m_span_idx);
}
const span_data& operator*() const { return m_span; }
const span_data* operator->() const { return &m_span; }
void operator ++ ()
{
++m_span_idx;
m_span = m_storage->span_by_index(m_span_idx);
}
private:
const scanline_storage_bin* m_storage;
unsigned m_span_idx;
span_data m_span;
};
friend class const_iterator;
//-----------------------------------------------------------
embedded_scanline(const scanline_storage_bin& storage) :
m_storage(&storage)
{
setup(0);
}
//-----------------------------------------------------------
void reset(int, int) {}
unsigned num_spans() const { return m_scanline.num_spans; }
int y() const { return m_scanline.y; }
const_iterator begin() const { return const_iterator(*this); }
//-----------------------------------------------------------
void setup(unsigned scanline_idx)
{
m_scanline_idx = scanline_idx;
m_scanline = m_storage->scanline_by_index(m_scanline_idx);
}
private:
const scanline_storage_bin* m_storage;
scanline_data m_scanline;
unsigned m_scanline_idx;
};
//---------------------------------------------------------------
scanline_storage_bin() :
m_spans(256-2), // Block increment size
m_scanlines(),
m_min_x( 0x7FFFFFFF),
m_min_y( 0x7FFFFFFF),
m_max_x(-0x7FFFFFFF),
m_max_y(-0x7FFFFFFF),
m_cur_scanline(0)
{
m_fake_scanline.y = 0;
m_fake_scanline.num_spans = 0;
m_fake_scanline.start_span = 0;
m_fake_span.x = 0;
m_fake_span.len = 0;
}
// Renderer Interface
//---------------------------------------------------------------
void prepare()
{
m_scanlines.remove_all();
m_spans.remove_all();
m_min_x = 0x7FFFFFFF;
m_min_y = 0x7FFFFFFF;
m_max_x = -0x7FFFFFFF;
m_max_y = -0x7FFFFFFF;
m_cur_scanline = 0;
}
//---------------------------------------------------------------
template<class Scanline> void render(const Scanline& sl)
{
scanline_data sl_this;
int y = sl.y();
if(y < m_min_y) m_min_y = y;
if(y > m_max_y) m_max_y = y;
sl_this.y = y;
sl_this.num_spans = sl.num_spans();
sl_this.start_span = m_spans.size();
typename Scanline::const_iterator span_iterator = sl.begin();
unsigned num_spans = sl_this.num_spans;
for(;;)
{
span_data sp;
sp.x = span_iterator->x;
sp.len = (int32)abs((int)(span_iterator->len));
m_spans.add(sp);
int x1 = sp.x;
int x2 = sp.x + sp.len - 1;
if(x1 < m_min_x) m_min_x = x1;
if(x2 > m_max_x) m_max_x = x2;
if(--num_spans == 0) break;
++span_iterator;
}
m_scanlines.add(sl_this);
}
//---------------------------------------------------------------
// Iterate scanlines interface
int min_x() const { return m_min_x; }
int min_y() const { return m_min_y; }
int max_x() const { return m_max_x; }
int max_y() const { return m_max_y; }
//---------------------------------------------------------------
bool rewind_scanlines()
{
m_cur_scanline = 0;
return m_scanlines.size() > 0;
}
//---------------------------------------------------------------
template<class Scanline> bool sweep_scanline(Scanline& sl)
{
sl.reset_spans();
for(;;)
{
if(m_cur_scanline >= m_scanlines.size()) return false;
const scanline_data& sl_this = m_scanlines[m_cur_scanline];
unsigned num_spans = sl_this.num_spans;
unsigned span_idx = sl_this.start_span;
do
{
const span_data& sp = m_spans[span_idx++];
sl.add_span(sp.x, sp.len, cover_full);
}
while(--num_spans);
++m_cur_scanline;
if(sl.num_spans())
{
sl.finalize(sl_this.y);
break;
}
}
return true;
}
//---------------------------------------------------------------
// Specialization for embedded_scanline
bool sweep_scanline(embedded_scanline& sl)
{
do
{
if(m_cur_scanline >= m_scanlines.size()) return false;
sl.setup(m_cur_scanline);
++m_cur_scanline;
}
while(sl.num_spans() == 0);
return true;
}
//---------------------------------------------------------------
unsigned byte_size() const
{
unsigned i;
unsigned size = sizeof(int32) * 4; // min_x, min_y, max_x, max_y
for(i = 0; i < m_scanlines.size(); ++i)
{
size += sizeof(int32) * 2 + // Y, num_spans
unsigned(m_scanlines[i].num_spans) * sizeof(int32) * 2; // X, span_len
}
return size;
}
//---------------------------------------------------------------
static void write_int32(int8u* dst, int32 val)
{
dst[0] = ((const int8u*)&val)[0];
dst[1] = ((const int8u*)&val)[1];
dst[2] = ((const int8u*)&val)[2];
dst[3] = ((const int8u*)&val)[3];
}
//---------------------------------------------------------------
void serialize(int8u* data) const
{
unsigned i;
write_int32(data, min_x()); // min_x
data += sizeof(int32);
write_int32(data, min_y()); // min_y
data += sizeof(int32);
write_int32(data, max_x()); // max_x
data += sizeof(int32);
write_int32(data, max_y()); // max_y
data += sizeof(int32);
for(i = 0; i < m_scanlines.size(); ++i)
{
const scanline_data& sl_this = m_scanlines[i];
write_int32(data, sl_this.y); // Y
data += sizeof(int32);
write_int32(data, sl_this.num_spans); // num_spans
data += sizeof(int32);
unsigned num_spans = sl_this.num_spans;
unsigned span_idx = sl_this.start_span;
do
{
const span_data& sp = m_spans[span_idx++];
write_int32(data, sp.x); // X
data += sizeof(int32);
write_int32(data, sp.len); // len
data += sizeof(int32);
}
while(--num_spans);
}
}
//---------------------------------------------------------------
const scanline_data& scanline_by_index(unsigned i) const
{
return (i < m_scanlines.size()) ? m_scanlines[i] : m_fake_scanline;
}
//---------------------------------------------------------------
const span_data& span_by_index(unsigned i) const
{
return (i < m_spans.size()) ? m_spans[i] : m_fake_span;
}
private:
pod_bvector<span_data, 10> m_spans;
pod_bvector<scanline_data, 8> m_scanlines;
span_data m_fake_span;
scanline_data m_fake_scanline;
int m_min_x;
int m_min_y;
int m_max_x;
int m_max_y;
unsigned m_cur_scanline;
};
//---------------------------------------serialized_scanlines_adaptor_bin
class serialized_scanlines_adaptor_bin
{
public:
typedef bool cover_type;
//--------------------------------------------------------------------
class embedded_scanline
{
public:
//----------------------------------------------------------------
class const_iterator
{
public:
struct span
{
int32 x;
int32 len;
};
const_iterator() : m_ptr(0) {}
const_iterator(const embedded_scanline& sl) :
m_ptr(sl.m_ptr),
m_dx(sl.m_dx)
{
m_span.x = read_int32() + m_dx;
m_span.len = read_int32();
}
const span& operator*() const { return m_span; }
const span* operator->() const { return &m_span; }
void operator ++ ()
{
m_span.x = read_int32() + m_dx;
m_span.len = read_int32();
}
private:
int read_int32()
{
int32 val;
((int8u*)&val)[0] = *m_ptr++;
((int8u*)&val)[1] = *m_ptr++;
((int8u*)&val)[2] = *m_ptr++;
((int8u*)&val)[3] = *m_ptr++;
return val;
}
const int8u* m_ptr;
span m_span;
int m_dx;
};
friend class const_iterator;
//----------------------------------------------------------------
embedded_scanline() : m_ptr(0), m_y(0), m_num_spans(0) {}
//----------------------------------------------------------------
void reset(int, int) {}
unsigned num_spans() const { return m_num_spans; }
int y() const { return m_y; }
const_iterator begin() const { return const_iterator(*this); }
private:
//----------------------------------------------------------------
int read_int32()
{
int32 val;
((int8u*)&val)[0] = *m_ptr++;
((int8u*)&val)[1] = *m_ptr++;
((int8u*)&val)[2] = *m_ptr++;
((int8u*)&val)[3] = *m_ptr++;
return val;
}
public:
//----------------------------------------------------------------
void init(const int8u* ptr, int dx, int dy)
{
m_ptr = ptr;
m_y = read_int32() + dy;
m_num_spans = unsigned(read_int32());
m_dx = dx;
}
private:
const int8u* m_ptr;
int m_y;
unsigned m_num_spans;
int m_dx;
};
public:
//--------------------------------------------------------------------
serialized_scanlines_adaptor_bin() :
m_data(0),
m_end(0),
m_ptr(0),
m_dx(0),
m_dy(0),
m_min_x(0x7FFFFFFF),
m_min_y(0x7FFFFFFF),
m_max_x(-0x7FFFFFFF),
m_max_y(-0x7FFFFFFF)
{}
//--------------------------------------------------------------------
serialized_scanlines_adaptor_bin(const int8u* data, unsigned size,
double dx, double dy) :
m_data(data),
m_end(data + size),
m_ptr(data),
m_dx(iround(dx)),
m_dy(iround(dy)),
m_min_x(0x7FFFFFFF),
m_min_y(0x7FFFFFFF),
m_max_x(-0x7FFFFFFF),
m_max_y(-0x7FFFFFFF)
{}
//--------------------------------------------------------------------
void init(const int8u* data, unsigned size, double dx, double dy)
{
m_data = data;
m_end = data + size;
m_ptr = data;
m_dx = iround(dx);
m_dy = iround(dy);
m_min_x = 0x7FFFFFFF;
m_min_y = 0x7FFFFFFF;
m_max_x = -0x7FFFFFFF;
m_max_y = -0x7FFFFFFF;
}
private:
//--------------------------------------------------------------------
int read_int32()
{
int32 val;
((int8u*)&val)[0] = *m_ptr++;
((int8u*)&val)[1] = *m_ptr++;
((int8u*)&val)[2] = *m_ptr++;
((int8u*)&val)[3] = *m_ptr++;
return val;
}
public:
// Iterate scanlines interface
//--------------------------------------------------------------------
bool rewind_scanlines()
{
m_ptr = m_data;
if(m_ptr < m_end)
{
m_min_x = read_int32() + m_dx;
m_min_y = read_int32() + m_dy;
m_max_x = read_int32() + m_dx;
m_max_y = read_int32() + m_dy;
}
return m_ptr < m_end;
}
//--------------------------------------------------------------------
int min_x() const { return m_min_x; }
int min_y() const { return m_min_y; }
int max_x() const { return m_max_x; }
int max_y() const { return m_max_y; }
//--------------------------------------------------------------------
template<class Scanline> bool sweep_scanline(Scanline& sl)
{
sl.reset_spans();
for(;;)
{
if(m_ptr >= m_end) return false;
int y = read_int32() + m_dy;
unsigned num_spans = read_int32();
do
{
int x = read_int32() + m_dx;
int len = read_int32();
if(len < 0) len = -len;
sl.add_span(x, unsigned(len), cover_full);
}
while(--num_spans);
if(sl.num_spans())
{
sl.finalize(y);
break;
}
}
return true;
}
//--------------------------------------------------------------------
// Specialization for embedded_scanline
bool sweep_scanline(embedded_scanline& sl)
{
do
{
if(m_ptr >= m_end) return false;
sl.init(m_ptr, m_dx, m_dy);
// Jump to the next scanline
//--------------------------
read_int32(); // Y
int num_spans = read_int32(); // num_spans
m_ptr += num_spans * sizeof(int32) * 2;
}
while(sl.num_spans() == 0);
return true;
}
private:
const int8u* m_data;
const int8u* m_end;
const int8u* m_ptr;
int m_dx;
int m_dy;
int m_min_x;
int m_min_y;
int m_max_x;
int m_max_y;
};
}
#endif
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