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add is_switchable to control switchabilty of vertex_converters

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This commit is contained in:
artemp 2015-04-27 14:00:52 +02:00
parent b83fc8c2cc
commit 666ce82ae4
1 changed files with 23 additions and 6 deletions
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29
include/mapnik/vertex_converters.hpp
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@ -252,6 +252,27 @@ struct converter_traits<T,mapnik::offset_transform_tag>
} }
}; };
template <typename T0, typename T1>
struct is_switchable
{
static constexpr bool value = true;
};
template <typename T>
struct is_switchable<T,transform_tag>
{
static constexpr bool value = false;
};
template <typename T>
struct is_switchable<T,stroke_tag>
{
static constexpr bool value = false;
};
template <typename Dispatcher, typename... ConverterTypes> template <typename Dispatcher, typename... ConverterTypes>
struct converters_helper; struct converters_helper;
@ -274,9 +295,7 @@ struct converters_helper<Dispatcher,Current,ConverterTypes...>
template <typename Geometry, typename Processor> template <typename Geometry, typename Processor>
static void forward(Dispatcher & disp, Geometry & geom, Processor & proc, static void forward(Dispatcher & disp, Geometry & geom, Processor & proc,
typename std::enable_if<!std::is_same typename std::enable_if<detail::is_switchable<Geometry,Current>::value>::type* = 0)
<typename detail::converter_traits<Geometry,Current>::conv_type,
transform_path_adapter<view_transform, Geometry> >::value >::type* = 0)
{ {
constexpr std::size_t index = sizeof...(ConverterTypes); constexpr std::size_t index = sizeof...(ConverterTypes);
if (disp.vec_[index] == 1) if (disp.vec_[index] == 1)
@ -293,9 +312,7 @@ struct converters_helper<Dispatcher,Current,ConverterTypes...>
} }
template <typename Geometry, typename Processor> template <typename Geometry, typename Processor>
static void forward(Dispatcher & disp, Geometry & geom, Processor & proc, static void forward(Dispatcher & disp, Geometry & geom, Processor & proc,
typename std::enable_if<std::is_same typename std::enable_if<!detail::is_switchable<Geometry,Current>::value>::type* = 0)
<typename detail::converter_traits<Geometry,Current>::conv_type,
transform_path_adapter<view_transform, Geometry> >::value >::type* = 0)
{ {
using conv_type = typename detail::converter_traits<Geometry,Current>::conv_type; using conv_type = typename detail::converter_traits<Geometry,Current>::conv_type;
conv_type conv(geom); conv_type conv(geom);