/usr/include/mapnik/transform_expression.hpp is in libmapnik-dev 2.2.0+ds1-7+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2012 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_TRANSFORM_EXPRESSION_HPP
#define MAPNIK_TRANSFORM_EXPRESSION_HPP
// mapnik
#include <mapnik/expression_node.hpp>
// boost
#include <boost/optional.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/variant/variant.hpp>
// fusion
#include <boost/fusion/include/at.hpp>
#include <boost/fusion/include/vector.hpp>
// stl
#include <vector>
namespace mapnik {
struct identity_node {};
struct matrix_node
{
expr_node a_;
expr_node b_;
expr_node c_;
expr_node d_;
expr_node e_;
expr_node f_;
explicit matrix_node(double const* m)
: a_(m[0]), b_(m[1]), c_(m[2]), d_(m[3]), e_(m[4]), f_(m[5]) {}
template <typename T>
explicit matrix_node(T const& m)
: a_(m.sx), b_(m.shy), c_(m.shx), d_(m.sy), e_(m.tx), f_(m.ty) {}
matrix_node(expr_node const& a, expr_node const& b, expr_node const& c,
expr_node const& d, expr_node const& e, expr_node const& f)
: a_(a), b_(b), c_(c), d_(d), e_(e), f_(f) {}
};
struct translate_node
{
expr_node tx_;
expr_node ty_;
translate_node(expr_node const& tx,
boost::optional<expr_node> const& ty)
: tx_(tx)
, ty_(ty ? expr_node(*ty) : value_null()) {}
};
struct scale_node
{
expr_node sx_;
expr_node sy_;
scale_node(expr_node const& sx,
boost::optional<expr_node> const& sy)
: sx_(sx)
, sy_(sy ? expr_node(*sy) : value_null()) {}
};
struct rotate_node
{
typedef boost::fusion::vector2<expr_node, expr_node> coords_type;
expr_node angle_;
expr_node cx_;
expr_node cy_;
explicit rotate_node(expr_node const& angle)
: angle_(angle) {}
rotate_node(expr_node const& angle,
expr_node const& cx, expr_node const& cy)
: angle_(angle), cx_(cx), cy_(cy) {}
rotate_node(expr_node const& angle,
boost::optional<expr_node> const& cx,
boost::optional<expr_node> const& cy)
: angle_(angle)
, cx_(cx ? expr_node(*cx) : value_null())
, cy_(cy ? expr_node(*cy) : value_null()) {}
rotate_node(expr_node const& angle,
boost::optional<coords_type> const& center)
: angle_(angle)
{
if (center)
{
cx_ = boost::fusion::at_c<0>(*center);
cy_ = boost::fusion::at_c<1>(*center);
}
}
};
struct skewX_node
{
expr_node angle_;
explicit skewX_node(expr_node const& angle)
: angle_(angle) {}
};
struct skewY_node
{
expr_node angle_;
explicit skewY_node(expr_node const& angle)
: angle_(angle) {}
};
namespace detail {
// boost::spirit::traits::clear<T>(T& val) [with T = boost::variant<...>]
// attempts to assign to the variant's current value a default-constructed
// value of the same type, which not only requires that each value-type is
// default-constructible, but also makes little sense with our variant of
// transform nodes...
typedef boost::variant< identity_node
, matrix_node
, translate_node
, scale_node
, rotate_node
, skewX_node
, skewY_node
> transform_variant;
// ... thus we wrap the variant-type in a distinct type and provide
// a custom clear overload, which resets the value to identity_node
struct transform_node
{
transform_variant base_;
transform_node()
: base_() {}
template <typename T>
transform_node(T const& val)
: base_(val) {}
template <typename T>
transform_node& operator= (T const& val)
{
base_ = val;
return *this;
}
transform_variant const& operator* () const
{
return base_;
}
transform_variant& operator* ()
{
return base_;
}
};
inline void clear(transform_node& val)
{
val.base_ = identity_node();
}
} // namespace detail
typedef detail::transform_node transform_node;
typedef std::vector<transform_node> transform_list;
typedef boost::shared_ptr<transform_list> transform_list_ptr;
MAPNIK_DECL std::string to_expression_string(transform_node const& node);
MAPNIK_DECL std::string to_expression_string(transform_list const& list);
} // namespace mapnik
#endif // MAPNIK_TRANSFORM_EXPRESSION_HPP
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