refactored code for extracting image dimensions from metadata

(cherry picked from commit 0ece9c5bfad09bc9052238d83fa696ef39effaaa)

rtengine/imagedata.cc

@@ -81,7 +81,9 @@ FramesData::FramesData(const Glib::ustring &fname) :
     lens("Unknown"),
     sampleFormat(IIOSF_UNKNOWN),
     isPixelShift(false),
-    isHDR(false)
+    isHDR(false),
+    w_(-1),
+    h_(-1)
 {
     make.clear();
     model.clear();
@@ -374,6 +376,8 @@ FramesData::FramesData(const Glib::ustring &fname) :
             }
         }
 
+        meta.getDimensions(w_, h_);
+
         // -----------------------
         // Special file type detection (HDR, PixelShift)
         // ------------------------
@@ -773,3 +777,17 @@ void FramesData::fillBasicTags(Exiv2::ExifData &exif) const
     strftime(buf, 256, "%Y:%m:%d %H:%M:%S", &t);
     set_exif(exif, "Exif.Photo.DateTimeOriginal", buf);
 }
+
+
+void FramesData::getDimensions(int &w, int &h) const
+{
+    w = w_;
+    h = h_;
+}
+
+
+void FramesData::setDimensions(int w, int h)
+{
+    w_ = w;
+    h_ = h;
+}