I've recently had the chance to use a Macbook Pro with Retina Display, and its quite clear that the display is futuristic enough to actually warrant Apple's over-the-top marketing.
I've got sensitive eyes, and I don't like looking at very small text. Apple's virtual scaling for HiDPI resolutions scales the entire screen, not just text/UI buttons. This creates a higher level of detail on a canvas encompassing a smaller virtual resolution.
Most discussions that I've found say there's no similar solution when using Linux except to change gnome DPI settings.
After some cursory research, it seems that scaled resolutions are possible under X11 (see here). The --scale feature can be used for netbooks virtualizing a larger resolution, but could inverted values emulate a 1440x900 desktop on a 2880x1800 screen? If not, why?