We were doing an entire copy of the framebuffer every fucking
render for no good reason whatsoever. Found this while working
on #83, but let's get it in master immediately. JFC. I suck.
Before (delay factor of 0.5):
[schwarzgerat](0) $ time ./notcurses-demo -d.5
Term: xterm with direct-color indexing
1737 renders, 24.8s total (0.00131s min, 0.362s max, 0.014s avg 70.1 fps)
230217.182KB total (12.696KB min, 223.310KB max, 132.54KB avg)
Emits/elides: def 1074878/126257 fg 6615070/3023957 bg 5519815/3130192
Elide rates: 10.51% 31.37% 36.19%
real 0m47.653s
user 0m8.977s
sys 0m1.414s
[schwarzgerat](0) $
After (same delay factor of 0.5)
[schwarzgerat](0) $ time ./notcurses-demo -d.5
Term: xterm with direct-color indexing
1741 renders, 23.2s total (0.00125s min, 0.351s max, 0.013s avg 75.0 fps)
231551.089KB total (12.696KB min, 223.310KB max, 133.00KB avg)
Emits/elides: def 1065445/126257 fg 6655295/3006679 bg 5566155/3115184
Elide rates: 10.59% 31.12% 35.88%
real 0m46.140s
user 0m8.932s
sys 0m1.350s
[schwarzgerat](0) $
Now *there's* the loss we saw during #139 work, thinking we'd get it
back in #143. Good. Huzzah! But also fuck!
* improved alpha macros
* demo: use new alpha macros
* add ncplane_set_*_alpha()
* explicitly set fg for uniblock
* outro: background is a space #139
* distinct alpha channels for fg/bg #139
* rename 'background' cell to 'default' #142
* doc palette fades
nick black