Well the thing is, there's a funny story behind that rendering code:
All of that beautiful free open source rendering code was originally conceived in the master bedroom of its parent's house, the X11 server. Its parents had ambitious but traditional plans for it, from the time it was only one bit deep, and as it grew up and learned how to walk around on eight bits with the help of a colormap.
Then when it finally reached puberty and learned how to composite 24 bit images into deep visuals, it needed more space and some privacy of its own, and room to store its growing collection of pixels, so its parents moved it into the X Rendering extension in the basement.
But it still had to share a single telephone line with its parents, who monitored all of its communications and screened its friends, while insisting it do all its chores like taking out the garbage and cleaning its buffers, before going out and playing with its friends.
It managed to open up a shared memory window into the back yard, so it could move larger quantities of pixels and cache back and forth between its local clients and its room in the basement, without waking up its parents in the middle of the night.
But as it grew up, it started dealing more and more little packets of pixels with its local clients on the side, and going away on frequent rides to make deliveries to remote clients, so its parents became suspicious and angry.
This caused many problems, but managed to work for a while. But then when it got older, it started getting invited to sleep over parties, where its friends and growing list of clients invited it to bring all its favorite pixels to their house to share and mix together.
Eventually it was regularly performing as Master Compositor at huge parties, pumping out colorful house pixels with throbbing techno alpha channels, deep into the night and on into the early morning.
But that behavior caused terrible problems with its parents at home, who didn't approve of being out of the loop, but still having to foot the bill for its Frosted Flakes and AOL subscription.
Finally it got its shit together enough to move out of its parent's basement, and into a small shared library apartment in Cairo, so it could perform freelance jobs for its growing list of clients who didn't want any involvement with its parents. Now it could party with its friends and clients, without its parents knowing and interfering with its pursuit of happiness.
Its parents had some very old-fashioned parochial ideas about font rendering and naming. They firmly believed that a font's place was in the pixmap, angrily hated the ideas of mixed alpha antialiasing or same alpha transparency, approved of the missionary transform but were otherwise affine-transphobic, and they sternly disapproved of outline fonts with soft voluptuous curves and gentle antialiased edges.
But with its new found maturity and hard earned freedom, it got lucky enough to hook up with a sexy outline font rendering stripper named Crystal FreeType and an elegant internationally suave text layout pole dancer named Paris Pango. As a free software threesome, together they integrated seamlessly, worked beautifully, hooked up with prolific scripts and toolkits, and painted some truly epic scenes.
As their careers advanced, they were employed in many important high profile jobs, including as Art Director of the renowned GTK+ Disco Dance Party (the Soul Train of the Desktop, syndicated to a long list of platforms and scripting languages), and MC (Master Compositor) of the internationally televised Mozilla Firefox Web Surfing Variety Show (based on the original Solid Gold Netscape show, that inspired all the others).
Not only did they cover other famous artist's works like HTML, CSS, SVG, PDF and XUL, but they also showcased their own instant-classic Canvas API, which revolutionized the world wide web and matured from a popular fad into an essential institution used by everyone around the world.
So at this point in history, there's really no point in asking such successful code to go back and live in its parent's basement again, because its style would be cramped, and nobody would want to visit it there, now that it finally has its own rich interesting life to live in the real world. ;)