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Re: alpha support for colors
From: |
Eli Zaretskii |
Subject: |
Re: alpha support for colors |
Date: |
Wed, 31 Oct 2012 06:00:07 +0200 |
> From: "Stephen J. Turnbull" <address@hidden>
> Cc: aaditya sood <address@hidden>,
> address@hidden
> Date: Wed, 31 Oct 2012 11:06:11 +0900
>
> Eli Zaretskii writes:
>
> > What do you mean by "composition of all the faces"? Why "all"?
>
> I suspect aaditya is thinking in terms of bitmap composition
> operations on graphics layers, not Emacs faces.
Maybe. I just don't understand clearly enough what exactly was the
intent.
As you know, Emacs doesn't operate on the bitmap level, except very
low in the terminal-specific code. At that level, there are no faces
anymore, just colors and other graphics-related stuff.
> So he'd like to put an overlay on some text, give that overlay a 'face
> property of '(+ red), and turn all the blue text in the overlay to
> violet (the RGB sum of #F00 and #00F == #F0F).
Maybe I don't get something, but (a) this _is_ about faces and their
combination, '(+ red) being a kind of "syntactic sugar"; and (b) all
it needs is the ability to combine colors when merging faces, instead
of just selecting one color of the two. By contrast, alpha-blending,
AFAIU, is about transparency, not about combining any 2 colors. So
I'm probably still missing something.
- alpha support for colors, aaditya sood, 2012/10/29
- Re: alpha support for colors, Chong Yidong, 2012/10/29
- Re: alpha support for colors, aaditya sood, 2012/10/30
- Re: alpha support for colors, Masatake YAMATO, 2012/10/30
- Re: alpha support for colors, joakim, 2012/10/30
- Re: alpha support for colors, aaditya sood, 2012/10/30
- Re: alpha support for colors, Stefan Monnier, 2012/10/30
- Re: alpha support for colors, Eli Zaretskii, 2012/10/30
- Re: alpha support for colors, Stephen J. Turnbull, 2012/10/30
- Re: alpha support for colors,
Eli Zaretskii <=
- Re: alpha support for colors, Eli Zaretskii, 2012/10/30