It was a swing application (the company's deployment tooling). I ran through the configuration definitions and for each element created a BufferedImage the pre

It was a swing application (the company's deployment tooling). I ran through the configuration definitions and for each element created a BufferedImage the preferred size of the associated component. Then I rendered the component to the BufferedImage using BufferedImage::getGraphics, and Component::paint. Then I saved the image as <definition>.PNG. Nothing magical.