PVRIC (PowerVR Image Compression) on Imagination 2018 and later GPU devices offers software-transparent compression that enables cross-origin pixel-stealing attacks against feTurbulence and feBlend in the SVG Filter specification, aka a GPU.zip issue. For example, attackers can sometimes accurately determine text contained on a web page from one origin if they control a resource from a different origin.
https://www.w3.org/TR/filter-effects-1/
https://www.hertzbleed.com/gpu.zip/GPU-zip.pdf
https://www.hertzbleed.com/gpu.zip/
https://news.ycombinator.com/item?id=37663159
https://blog.imaginationtech.com/reducing-bandwidth-pvric/
https://blog.imaginationtech.com/introducing-pvric4-taking-image-compression-to-the-next-level/