/usr/include/mapnik/agg/agg_span_pattern_rgba.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 high precision colors 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_SPAN_PATTERN_RGBA_INCLUDED
#define AGG_SPAN_PATTERN_RGBA_INCLUDED
#include "agg_basics.h"
namespace agg
{
//======================================================span_pattern_rgba
template<class Source> class span_pattern_rgba
{
public:
typedef Source source_type;
typedef typename source_type::color_type color_type;
typedef typename source_type::order_type order_type;
typedef typename color_type::value_type value_type;
typedef typename color_type::calc_type calc_type;
//--------------------------------------------------------------------
span_pattern_rgba() {}
span_pattern_rgba(source_type& src,
unsigned offset_x, unsigned offset_y) :
m_src(&src),
m_offset_x(offset_x),
m_offset_y(offset_y)
{}
//--------------------------------------------------------------------
void attach(source_type& v) { m_src = &v; }
source_type& source() { return *m_src; }
const source_type& source() const { return *m_src; }
//--------------------------------------------------------------------
void offset_x(unsigned v) { m_offset_x = v; }
void offset_y(unsigned v) { m_offset_y = v; }
unsigned offset_x() const { return m_offset_x; }
unsigned offset_y() const { return m_offset_y; }
void alpha(value_type) {}
value_type alpha() const { return 0; }
//--------------------------------------------------------------------
void prepare() {}
void generate(color_type* span, int x, int y, unsigned len)
{
x += m_offset_x;
y += m_offset_y;
const value_type* p = (const value_type*)m_src->span(x, y, len);
do
{
span->r = p[order_type::R];
span->g = p[order_type::G];
span->b = p[order_type::B];
span->a = p[order_type::A];
p = (const value_type*)m_src->next_x();
++span;
}
while(--len);
}
private:
source_type* m_src;
unsigned m_offset_x;
unsigned m_offset_y;
};
}
#endif
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