[Pixman] Proposal for pixman's glyph rendering: alpha correction

[Bill Spitzak]

I believe this is viable. The same rules can be used for anti-aliasing 
shapes and lines, too.

Instead of 1-fg, I would guess the background to be a gray shade, with a 
value of 1 until the foreground color goes above a brightness threshold 
and then it should switch to fg-K where K is the threshold.

There may also be approaches where it can peek at the destination to 
guess at the background color.

Antti Lankila wrote:
> I have a suggestion for getting sRGB-like text rendering without having sRGB alpha blending primitive. It's based on adjusting the alpha values of the glyph masks based on text foreground color without knowledge of the background color. I generated a writeup of it here:
> 
> https://bel.fi/alankila/lcd/alpcor.html
> 
> This looks like something that pixman's new glyph rendering code might consider doing. Thoughts?
> 
> 
> 
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