class ImageLoader
{
-private:
+protected:
class RegisterBase
{
protected:
virtual ImageLoader *create(IO::Seekable &) const = 0;
};
-protected:
- template<typename T>
- class Register: RegisterBase
- {
- public:
- virtual unsigned get_signature_size() const { return T::get_signature_size(); }
- virtual bool detect(const std::string &s) const { return T::detect(s); }
- virtual T *create(IO::Seekable &io) const { return new T(io); }
- };
-
private:
IO::Base *source;
virtual void load(Image::Data &) = 0;
};
+
+template<typename T>
+class RegisteredImageLoader: public ImageLoader
+{
+ friend class ImageLoader;
+
+private:
+ class Register: public RegisterBase
+ {
+ public:
+ virtual unsigned get_signature_size() const { return T::get_signature_size(); }
+ virtual bool detect(const std::string &s) const { return T::detect(s); }
+ virtual ImageLoader *create(IO::Seekable &io) const { return new T(io); }
+ };
+
+ static Register reg;
+
+protected:
+ RegisteredImageLoader() { (void)reg; }
+};
+
+template<typename T>
+typename RegisteredImageLoader<T>::Register RegisteredImageLoader<T>::reg;
+
} // namespace Graphics
} // namespace Msp