I would actually love to know why it's done this way 
The piet-metal algorithms will probably be similarly fast and high quality, and will be open source, but I haven't seriously started in on font rendering yet. Also Pathfinder 3 is up there.
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There are situations in which many approaches break down rather badly, but they’re largely ignored until you see the failure case. For example, most algorithms don’t handle minification well and thus have aliasing problems in 3D environments. Claims of quality are often oversold.
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Both piet-metal and Pathfinder 3 do exact-area calculation, and don't depend on hardware for antialiasing. Also, piet-metal pays special attention to doing alpha blending in a linear color space. My goals include better quality than people currently expect.
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