code: public RectF getZoomedRect() {
          if (mScaleType == ScaleType.FIT_XY) {
              throw new UnsupportedOperationException("getZoomedRect() not supported with FIT_XY");
          }
          PointF topLeft = transformCoordTouchToBitmap(0, 0, true);
          PointF bottomRight = transformCoordTouchToBitmap(viewWidth, viewHeight, true);
  
          float w = getDrawable().getIntrinsicWidth();
          float h = getDrawable().getIntrinsicHeight();
          return new RectF(topLeft.x / w, topLeft.y / h, bottomRight.x / w, bottomRight.y / h);
      }
docs: Return a Rect representing the zoomed image.
  
  @return rect representing zoomed image