/usr/include/mapnik/agg/agg_image_accessors.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
//----------------------------------------------------------------------------
#ifndef AGG_IMAGE_ACCESSORS_INCLUDED
#define AGG_IMAGE_ACCESSORS_INCLUDED
#include "agg_basics.h"
namespace agg
{
//-----------------------------------------------------image_accessor_clip
template<class PixFmt> class image_accessor_clip
{
public:
typedef PixFmt pixfmt_type;
typedef typename pixfmt_type::color_type color_type;
typedef typename pixfmt_type::order_type order_type;
typedef typename pixfmt_type::value_type value_type;
enum pix_width_e { pix_width = pixfmt_type::pix_width };
image_accessor_clip() {}
explicit image_accessor_clip(const pixfmt_type& pixf,
const color_type& bk) :
m_pixf(&pixf)
{
pixfmt_type::make_pix(m_bk_buf, bk);
}
void attach(const pixfmt_type& pixf)
{
m_pixf = &pixf;
}
void background_color(const color_type& bk)
{
pixfmt_type::make_pix(m_bk_buf, bk);
}
private:
AGG_INLINE const int8u* pixel() const
{
if(m_y >= 0 && m_y < (int)m_pixf->height() &&
m_x >= 0 && m_x < (int)m_pixf->width())
{
return m_pixf->pix_ptr(m_x, m_y);
}
return m_bk_buf;
}
public:
AGG_INLINE const int8u* span(int x, int y, unsigned len)
{
m_x = m_x0 = x;
m_y = y;
if(y >= 0 && y < (int)m_pixf->height() &&
x >= 0 && x+(int)len <= (int)m_pixf->width())
{
return m_pix_ptr = m_pixf->pix_ptr(x, y);
}
m_pix_ptr = 0;
return pixel();
}
AGG_INLINE const int8u* next_x()
{
if(m_pix_ptr) return m_pix_ptr += pix_width;
++m_x;
return pixel();
}
AGG_INLINE const int8u* next_y()
{
++m_y;
m_x = m_x0;
if(m_pix_ptr &&
m_y >= 0 && m_y < (int)m_pixf->height())
{
return m_pix_ptr = m_pixf->pix_ptr(m_x, m_y);
}
m_pix_ptr = 0;
return pixel();
}
private:
const pixfmt_type* m_pixf;
int8u m_bk_buf[4];
int m_x, m_x0, m_y;
const int8u* m_pix_ptr;
};
//--------------------------------------------------image_accessor_no_clip
template<class PixFmt> class image_accessor_no_clip
{
public:
typedef PixFmt pixfmt_type;
typedef typename pixfmt_type::color_type color_type;
typedef typename pixfmt_type::order_type order_type;
typedef typename pixfmt_type::value_type value_type;
enum pix_width_e { pix_width = pixfmt_type::pix_width };
image_accessor_no_clip() {}
explicit image_accessor_no_clip(const pixfmt_type& pixf) :
m_pixf(&pixf)
{}
void attach(const pixfmt_type& pixf)
{
m_pixf = &pixf;
}
AGG_INLINE const int8u* span(int x, int y, unsigned)
{
m_x = x;
m_y = y;
return m_pix_ptr = m_pixf->pix_ptr(x, y);
}
AGG_INLINE const int8u* next_x()
{
return m_pix_ptr += pix_width;
}
AGG_INLINE const int8u* next_y()
{
++m_y;
return m_pix_ptr = m_pixf->pix_ptr(m_x, m_y);
}
private:
const pixfmt_type* m_pixf;
int m_x, m_y;
const int8u* m_pix_ptr;
};
//----------------------------------------------------image_accessor_clone
template<class PixFmt> class image_accessor_clone
{
public:
typedef PixFmt pixfmt_type;
typedef typename pixfmt_type::color_type color_type;
typedef typename pixfmt_type::order_type order_type;
typedef typename pixfmt_type::value_type value_type;
enum pix_width_e { pix_width = pixfmt_type::pix_width };
image_accessor_clone() {}
explicit image_accessor_clone(const pixfmt_type& pixf) :
m_pixf(&pixf)
{}
void attach(const pixfmt_type& pixf)
{
m_pixf = &pixf;
}
private:
AGG_INLINE const int8u* pixel() const
{
register int x = m_x;
register int y = m_y;
if(x < 0) x = 0;
if(y < 0) y = 0;
if(x >= (int)m_pixf->width()) x = m_pixf->width() - 1;
if(y >= (int)m_pixf->height()) y = m_pixf->height() - 1;
return m_pixf->pix_ptr(x, y);
}
public:
AGG_INLINE const int8u* span(int x, int y, unsigned len)
{
m_x = m_x0 = x;
m_y = y;
if(y >= 0 && y < (int)m_pixf->height() &&
x >= 0 && x+(int)len <= (int)m_pixf->width())
{
return m_pix_ptr = m_pixf->pix_ptr(x, y);
}
m_pix_ptr = 0;
return pixel();
}
AGG_INLINE const int8u* next_x()
{
if(m_pix_ptr) return m_pix_ptr += pix_width;
++m_x;
return pixel();
}
AGG_INLINE const int8u* next_y()
{
++m_y;
m_x = m_x0;
if(m_pix_ptr &&
m_y >= 0 && m_y < (int)m_pixf->height())
{
return m_pix_ptr = m_pixf->pix_ptr(m_x, m_y);
}
m_pix_ptr = 0;
return pixel();
}
private:
const pixfmt_type* m_pixf;
int m_x, m_x0, m_y;
const int8u* m_pix_ptr;
};
//-----------------------------------------------------image_accessor_wrap
template<class PixFmt, class WrapX, class WrapY> class image_accessor_wrap
{
public:
typedef PixFmt pixfmt_type;
typedef typename pixfmt_type::color_type color_type;
typedef typename pixfmt_type::order_type order_type;
typedef typename pixfmt_type::value_type value_type;
enum pix_width_e { pix_width = pixfmt_type::pix_width };
image_accessor_wrap() {}
explicit image_accessor_wrap(const pixfmt_type& pixf) :
m_pixf(&pixf),
m_wrap_x(pixf.width()),
m_wrap_y(pixf.height())
{}
void attach(const pixfmt_type& pixf)
{
m_pixf = &pixf;
}
AGG_INLINE const int8u* span(int x, int y, unsigned)
{
m_x = x;
m_row_ptr = m_pixf->row_ptr(m_wrap_y(y));
return m_row_ptr + m_wrap_x(x) * pix_width;
}
AGG_INLINE const int8u* next_x()
{
int x = ++m_wrap_x;
return m_row_ptr + x * pix_width;
}
AGG_INLINE const int8u* next_y()
{
m_row_ptr = m_pixf->row_ptr(++m_wrap_y);
return m_row_ptr + m_wrap_x(m_x) * pix_width;
}
private:
const pixfmt_type* m_pixf;
const int8u* m_row_ptr;
int m_x;
WrapX m_wrap_x;
WrapY m_wrap_y;
};
//--------------------------------------------------------wrap_mode_repeat
class wrap_mode_repeat
{
public:
wrap_mode_repeat() {}
wrap_mode_repeat(unsigned size) :
m_size(size),
m_add(size * (0x3FFFFFFF / size)),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
return m_value = (unsigned(v) + m_add) % m_size;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size) m_value = 0;
return m_value;
}
private:
unsigned m_size;
unsigned m_add;
unsigned m_value;
};
//---------------------------------------------------wrap_mode_repeat_pow2
class wrap_mode_repeat_pow2
{
public:
wrap_mode_repeat_pow2() {}
wrap_mode_repeat_pow2(unsigned size) : m_value(0)
{
m_mask = 1;
while(m_mask < size) m_mask = (m_mask << 1) | 1;
m_mask >>= 1;
}
AGG_INLINE unsigned operator() (int v)
{
return m_value = unsigned(v) & m_mask;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value > m_mask) m_value = 0;
return m_value;
}
private:
unsigned m_mask;
unsigned m_value;
};
//----------------------------------------------wrap_mode_repeat_auto_pow2
class wrap_mode_repeat_auto_pow2
{
public:
wrap_mode_repeat_auto_pow2() {}
wrap_mode_repeat_auto_pow2(unsigned size) :
m_size(size),
m_add(size * (0x3FFFFFFF / size)),
m_mask((m_size & (m_size-1)) ? 0 : m_size-1),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
if(m_mask) return m_value = unsigned(v) & m_mask;
return m_value = (unsigned(v) + m_add) % m_size;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size) m_value = 0;
return m_value;
}
private:
unsigned m_size;
unsigned m_add;
unsigned m_mask;
unsigned m_value;
};
//-------------------------------------------------------wrap_mode_reflect
class wrap_mode_reflect
{
public:
wrap_mode_reflect() {}
wrap_mode_reflect(unsigned size) :
m_size(size),
m_size2(size * 2),
m_add(m_size2 * (0x3FFFFFFF / m_size2)),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
m_value = (unsigned(v) + m_add) % m_size2;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size2) m_value = 0;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
private:
unsigned m_size;
unsigned m_size2;
unsigned m_add;
unsigned m_value;
};
//--------------------------------------------------wrap_mode_reflect_pow2
class wrap_mode_reflect_pow2
{
public:
wrap_mode_reflect_pow2() {}
wrap_mode_reflect_pow2(unsigned size) : m_value(0)
{
m_mask = 1;
m_size = 1;
while(m_mask < size)
{
m_mask = (m_mask << 1) | 1;
m_size <<= 1;
}
}
AGG_INLINE unsigned operator() (int v)
{
m_value = unsigned(v) & m_mask;
if(m_value >= m_size) return m_mask - m_value;
return m_value;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
m_value &= m_mask;
if(m_value >= m_size) return m_mask - m_value;
return m_value;
}
private:
unsigned m_size;
unsigned m_mask;
unsigned m_value;
};
//---------------------------------------------wrap_mode_reflect_auto_pow2
class wrap_mode_reflect_auto_pow2
{
public:
wrap_mode_reflect_auto_pow2() {}
wrap_mode_reflect_auto_pow2(unsigned size) :
m_size(size),
m_size2(size * 2),
m_add(m_size2 * (0x3FFFFFFF / m_size2)),
m_mask((m_size2 & (m_size2-1)) ? 0 : m_size2-1),
m_value(0)
{}
AGG_INLINE unsigned operator() (int v)
{
m_value = m_mask ? unsigned(v) & m_mask :
(unsigned(v) + m_add) % m_size2;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
AGG_INLINE unsigned operator++ ()
{
++m_value;
if(m_value >= m_size2) m_value = 0;
if(m_value >= m_size) return m_size2 - m_value - 1;
return m_value;
}
private:
unsigned m_size;
unsigned m_size2;
unsigned m_add;
unsigned m_mask;
unsigned m_value;
};
}
#endif
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