this post was submitted on 05 Nov 2026
976 points (99.1% liked)
Memes
17559 readers
390 users here now
Post memes here.
A meme is an idea, behavior, or style that spreads by means of imitation from person to person within a culture and often carries symbolic meaning representing a particular phenomenon or theme.
An Internet meme or meme, is a cultural item that is spread via the Internet, often through social media platforms. The name is by the concept of memes proposed by Richard Dawkins in 1972. Internet memes can take various forms, such as images, videos, GIFs, and various other viral sensations.
- Wait at least 2 months before reposting
- No explicitly political content (about political figures, political events, elections and so on), !politicalmemes@lemmy.ca can be better place for that
- Use NSFW marking accordingly
Laittakaa meemejä tänne.
- Odota ainakin 2 kuukautta ennen meemin postaamista uudelleen
- Ei selkeän poliittista sisältöä (poliitikoista, poliittisista tapahtumista, vaaleista jne) parempi paikka esim. !politicalmemes@lemmy.ca
- Merkitse K18-sisältö tarpeen mukaan
founded 4 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Strangely, this kinda makes sense. PDF is based on PostScript, which is a file type (also by Adobe) that gets sent to printers. It's just skipping the final "send to printer" part and sends it to a file instead.
A fascinating thing (in a scary way) is that PostScript is technically a full programming language with loops, functions, logic, and a built-in font rendering and 2D graphics engine. When a document is printed using PostScript, your computer generates a script to lay out the page, that the printer runs in order to produce the document!
PDF is essentially "the safe parts" of PostScript - the same 2D graphics engine but with all the dynamic parts removed. PDFs are statically laid out when they're created, rather than having to run arbitrary code to lay them out like PostScript does.
PDF does support JavaScript code, but it's rarely used and needs to be granted permission to run. It's not a core part of the format.
For printing, PCL has somewhat taken over and it's less scary - it just has preset commands rather than allowing arbitrary code in a full programming language. PostScript is still used today for higher-end printers and print jobs though.
It also had a extension to create NextStep UI with it.
It wasn’t really an extension… The nextstep user interface was just written in postscript and objective-C.
This is how the nextstep UI was so smooth and sharp and so well built for design, especially output to print. And how that translated to macOS (although the graphics display subsystem and macOS is based on the more advanced PDF, not postscript). It’s also part of the entire print sub systems, and how it was always so easy to create a PDF in the manner the OP suggests. That functionality was really only added to other operating systems later with plugins.
You can run doom on a pdf
Ok but that's a really low bar, you could just list on what Doom can't run :).
Also if you print doom.pdf, does the printer run it like this
or like this
?
A Bringus reference? On my Lemmy?
Oh, til.
I see some cool nerd shit tho, nice.
it is at least theoretically possible to boot from a PDF.
I've seen some pretty feature rich PDFs - before WebGIS got really good, people would often disseminate digital maps and geographic reports via GeospatialPDF which is an extension for PDF. You can do all kinds of stuff in there related to measuring distances, coordinate transformations and zoom/pan around the maps. Some of these files would end up being >500MB. Probably still used quite a lot field work I imagine.
Not just 2d, I've received some unholy pdfs with fully imbedded 3d models.
I forgot to mention that PDF added new features on top of PostScript, including 3D models.