class ImageLoader
{
+protected:
+ class RegisterBase
+ {
+ protected:
+ RegisterBase() { }
+ public:
+ virtual ~RegisterBase() { }
+
+ virtual unsigned get_signature_size() const = 0;
+ virtual bool detect(const std::string &) const = 0;
+ virtual ImageLoader *create(IO::Seekable &) const = 0;
+ };
+
+ template<typename T>
+ class RegisteredLoader: 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); }
+ };
+
+ struct Registry
+ {
+ std::list<RegisterBase *> loaders;
+ bool changed;
+
+ Registry();
+ ~Registry();
+ };
+
private:
IO::Base *source;
-protected:
+protected:
ImageLoader();
public:
virtual ~ImageLoader();
static ImageLoader *open_io(IO::Seekable &);
virtual void load(Image::Data &) = 0;
+
+ template<typename T>
+ static void register_loader();
+private:
+ static Registry &get_registry();
+
+ static bool signature_size_compare(RegisterBase *, RegisterBase *);
};
+template<typename T>
+void ImageLoader::register_loader()
+{
+ Registry ®istry = get_registry();
+ registry.loaders.push_back(new RegisteredLoader<T>);
+ registry.changed = true;
+}
+
} // namespace Graphics
} // namespace Msp