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simplify visitor code in image_compositing

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This commit is contained in:
Dane Springmeyer 2016-07-25 14:49:52 +02:00
parent f734368a73
commit 7fc9dfe06b
1 changed files with 15 additions and 19 deletions
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34
src/image_compositing.cpp
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@ -191,7 +191,20 @@ struct composite_visitor
dy_(dy) {}
template <typename T>
void operator() (T & dst) const;
void operator() (T & dst) const
{
throw std::runtime_error("Error: Composite with " + std::string(typeid(dst).name()) + " is not supported");
}
void operator()(image_rgba8 & dst) const
{
composite(dst, util::get<image_rgba8>(src_), mode_, opacity_, dx_, dy_);
}
void operator() (image_gray32f & dst) const
{
composite(dst, util::get<image_gray32f>(src_), mode_, opacity_, dx_, dy_);
}
private:
image_any const& src_;
@ -199,26 +212,9 @@ struct composite_visitor
float opacity_;
int dx_;
int dy_;
};
template <typename T>
void composite_visitor::operator() (T & dst) const
{
throw std::runtime_error("Error: Composite with " + std::string(typeid(dst).name()) + " is not supported");
}
template <>
void composite_visitor::operator()<image_rgba8> (image_rgba8 & dst) const
{
composite(dst, util::get<image_rgba8>(src_), mode_, opacity_, dx_, dy_);
}
template <>
void composite_visitor::operator()<image_gray32f> (image_gray32f & dst) const
{
composite(dst, util::get<image_gray32f>(src_), mode_, opacity_, dx_, dy_);
}
} // end ns
template <>