1 files changed, 25 insertions, 0 deletions
diff --git a/lib/gallery.common.js b/lib/gallery.common.js
index 06775d79..844e219b 100644
--- a/lib/gallery.common.js
+++ b/lib/gallery.common.js
@@ -125,5 +125,30 @@
     );
   };
 
+  $.gallery_auto_fit_window = function(imageWidth, imageHeight) {
+    var size = $.gallery_get_viewport_size();
+    var width = size.width() - 6,
+        height = size.height() - 6;
+
+      var ratio = width / imageWidth;
+      imageWidth *= ratio;
+      imageHeight *= ratio;
+
+      /* after scaling the width, check that the height fits */
+      if (imageHeight > height) {
+	ratio = height / imageHeight;
+	imageWidth *= ratio;
+	imageHeight *= ratio;
+      }
+
+      // handle the case where the calculation is almost zero (2.14e-14)
+      return {
+	top: Number((height - imageHeight) / 2),
+	left: Number((width - imageWidth) / 2),
+	width: Number(imageWidth),
+	height: Number(imageHeight)
+      };
+  };
+
 })(jQuery);