I often see this claim made on the Net, and it is always quickly followed by someone saying that it's a load of rubbish, and that there is nothing stopping Adob

I often see this claim made on the Net, and it is always quickly followed by someone saying that it's a load of rubbish, and that there is nothing stopping Adobe from doing harware acceleration in Safari plugins for the Mac. So, this being Hacker News, is there someone out there with some experience writing Safari plugins that can give us a definitive answer to this question (preferably with a brief description of the APIs involved). I don't think I can stand reading yet another thread on this topic which is filled with what appear to be poorly-researched assertions...