Add support for Jasper 3.x.

This resolves issue #4.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit d9d028f1e2)

digikam/libs/dimg/loaders/jp2kloader.cpp

@@ -660,7 +660,17 @@ bool JP2KLoader::save(const TQString& filePath, DImgLoaderObserver *observer)
     DDebug() << "JPEG2000 quality: " << quality << endl;
     DDebug() << "JPEG2000 " << rate << endl;
 
+#   if defined(JAS_VERSION_MAJOR) && (JAS_VERSION_MAJOR >= 3)
+    const jas_image_fmtinfo_t *jp2_fmtinfo = jas_image_lookupfmtbyname("jp2");
+    int ret = -1;
+    if (jp2_fmtinfo)
+    {
+        ret = jas_image_encode(jp2_image, jp2_stream, jp2_fmtinfo->id, rate.utf8().data());
+    }
+#   else
     int ret = jp2_encode(jp2_image, jp2_stream, rate.utf8().data());
+#   endif
+
     if (ret != 0)
     {
         DDebug() << "Unable to encode JPEG2000 image" << endl;