How to use

Thumber$WidthHeightHelper

in

com.atlassian.core.util.thumbnail

    new AreaAveragingScaleFilter(newDimensions.getWidth(), newDimensions.getHeight());
ImageProducer producer = new FilteredImageSource(imageToScale.getSource(),
    scaleFilter);

public WidthHeightHelper determineScaleSize(int maxWidth, int maxHeight, int imageWidth, int imageHeight)
{
  if (maxHeight > imageHeight && maxWidth > imageWidth)
  {
    return new Thumber.WidthHeightHelper(imageWidth, imageHeight);
  }
  // Determine scale size.
  // Retain original image proportions with scaled image.
  double thumbRatio = (double) maxWidth / (double) maxHeight;
  double imageRatio = (double) imageWidth / (double) imageHeight;
  if (thumbRatio < imageRatio)
  {
    return new Thumber.WidthHeightHelper(maxWidth, (int) (maxWidth / imageRatio));
  }
  else
  {
    return new Thumber.WidthHeightHelper((int) (maxHeight * imageRatio), maxHeight);
  }
}