From Glenn Waldron, "As you may recall, we discussed adding ReaderWriter::readObject() overrides to all the image plugins in order to facilitate future archive support. Attached are the necessary modifications. I tested JPEG, but not all the others... the code is identical though. Note that the DDS plugin already contained the readObject() implementations."

src/osgPlugins/bmp/ReaderWriterBMP.cpp

@@ -354,6 +354,16 @@ class ReaderWriterBMP : public osgDB::ReaderWriter
             return pOsgImage;
         }
 
+        virtual ReadResult readObject(std::istream& fin,const osgDB::ReaderWriter::Options* options =NULL) const
+        {
+            return readImage(fin, options);
+        }
+
+        virtual ReadResult readObject(const std::string& file, const osgDB::ReaderWriter::Options* options =NULL) const
+        {
+            return readImage(file, options);
+        }
+
         virtual ReadResult readImage(std::istream& fin,const Options* =NULL) const
         {
             return readBMPStream(fin);