Add a helper class for registering image loaders

[libs/gui.git] / source / graphics / png / pngloader.h

diff --git a/source/graphics/png/pngloader.h b/source/graphics/png/pngloader.h
index a81c34c3c49811318ed4cd912b70a98a43c48780..de8b53537c4b527526b109a0b66e63fbdf5e8e59 100644 (file)
--- a/source/graphics/png/pngloader.h
+++ b/source/graphics/png/pngloader.h
@@ -6,7 +6,7 @@
 namespace Msp {
 namespace Graphics {
 
-class PngLoader: public ImageLoader
+class PngLoader: public RegisteredImageLoader<PngLoader>
 {
 private:
        struct Private;
@@ -17,6 +17,7 @@ public:
        PngLoader(IO::Base &, unsigned = 0);
        virtual ~PngLoader();
 
+       static unsigned get_signature_size() { return 8; }
        static bool detect(const std::string &);
 
        virtual void load(Image::Data &);