fix image box fit

Assets/UIWidgets/Tests/Widgets.cs

                     height: 450,
                     color: CLColors.white,
                     child: widgets.Image.network(
-                        "https://d2ujflorbtfzji.cloudfront.net/banner/38942865-28db-482b-80c5-17809473f3c6.jpg",
+                        "https://d2ujflorbtfzji.cloudfront.net/banner/5c57178c-4be6-4903-953b-85125bfb7154.jpg",
                         fit: BoxFit.cover
                     )
             );
         public override Widget build(BuildContext context) {
             var card = new Container(
                 margin: EdgeInsets.only(right: 45),
-                color: CLColors.white,
-                    color: CLColors.white,
+                                decoration: new BoxDecoration(
+                                    color: CLColors.white,
+                                    borderRadius: BorderRadius.only(topLeft: 3, topRight: 3)
+                                ),
                                 width: 200,
                                 height: 124,
                                 child: widgets.Image.network(
                             ),
                             new Container(
+                                color: CLColors.white,
                                 width: 200,
                                 height: 86,
                                 padding: EdgeInsets.fromLTRB(14, 12, 14, 8),

Assets/UIWidgets/painting/box_fit.cs

                 case BoxFit.cover:
                     if (outputSize.width / outputSize.height > inputSize.width / inputSize.height) {
                         sourceSize = new Size(inputSize.width, inputSize.width * outputSize.height / outputSize.width);
+                    } else {
+                        sourceSize = new Size(inputSize.height * outputSize.width / outputSize.height, inputSize.height);
-                    else {
-                        sourceSize = new Size(inputSize.height * outputSize.width / outputSize.height,
-                            inputSize.height);
-                    }
-
-                    break;
+                    break; 
                 case BoxFit.fitWidth:
                     sourceSize = new Size(inputSize.width, inputSize.width * outputSize.height / outputSize.width);
                     destinationSize = new Size(outputSize.width,

Assets/UIWidgets/ui/painting/canvas_impl.cs

 
         public void drawImageRect(Rect src, Rect dst, Paint paint, Image image) {
             if (image != null && image.texture != null) {
-                Graphics.DrawTexture(dst.toRect(), image.texture);
+                // convert src rect to Unity rect in normalized coordinates with (0,0) in the bottom-left corner.
+                var textureHeight = image.texture.height;
+                var textureWidth = image.texture.width;
+                var srcRect = new UnityEngine.Rect(
+                    (float) (src.left / textureWidth), 
+                    (float) ((textureHeight - src.bottom) / textureHeight),
+                    (float) (src.width / textureWidth), 
+                    (float) (src.height / textureHeight)
+                );
+                Graphics.DrawTexture(dst.toRect(), image.texture, srcRect, 0, 0 ,0 ,0);
             }
         }