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by reissbaker 883 days ago
The kernel isn't all Apple, it's a fork of the open-source Mach kernel developed at CMU (which was a replacement BSD kernel). "Ground up" just isn't real!

The graphics libraries are definitely more custom... Although in total fairness they're not entirely ground-up Apple either; Quartz was based on Display PostScript, which was acquired from NeXT, and which NeXT built in collaboration with Adobe based on Adobe's earlier work on PostScript. It's obviously true Apple's done a lot of work since then (e.g. Metal), but in that case, so has Google since forking Webkit.
1 comments
astrange 882 days ago
Quartz isn't based on DPS - CoreGraphics drawing commands are similar to PDF but the window management was always all pixel based - and IIRC DPS was almost all Adobe and NeXT didn't even have source for it.
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reissbaker 882 days ago
Quartz was originally based on PDF and was marketed early on as "Display PDF" (a reference to being a more advanced version of "Display PostScript"): https://archive.arstechnica.com/reviews/1q00/macos-x-gui/mac...
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astrange 882 days ago
Well, it wasn't really based on PDF to the point it stores PDFs in memory or anything. Like I said, it just has compatible drawing commands.

It's turned out that vector images aren't that performant or easy to deal with for various reasons, although they are still used in some places.

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