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Re: Changes 2009-07-15/16 in branch?
From: |
David De La Harpe Golden |
Subject: |
Re: Changes 2009-07-15/16 in branch? |
Date: |
Tue, 28 Jul 2009 21:33:21 +0100 |
User-agent: |
Mozilla-Thunderbird 2.0.0.22 (X11/20090701) |
Adrian Robert wrote:
This sort of thing [in-emacs alphablending] would likely layer
> over alpha support at the lower level such as that provided by the NS
port.
Not necessarily at all, all realised colors could be without alpha,
the idea was raised in the context of 256-color terminal users in fact
where alpha computations would be internal to emacs.
(otoh might as well pass it through if it's also there at the OS level,
but that would just be a "final alpha" as an output of the blending
process).
Does emacs support rgb(r, g, b) or rgb:r/g/b already?
The latter on X11, but N.B. it's really X11 itself supporting it, not
emacs - i.e. emacs directly asks X11 for colors via the libX11
XParseColor() API [1] (internally emulated on most other platforms and
text terminals IIRC)
X11 supports a range of device-dependent and (rather obscure for most
people) device-independent color specification strings, as well as
previously mentioned well-known and user-defined names for those colors.
(None include alpha since alpha isn't historically part of the X color)
Given your interest is alpha and hsv (hsl is neater...), maybe imitating
the CSS2/3 syntax which includes alpha might be better - and is more
likely to avoid clashing if X.org extend XParseColor() one fine day.
CSS syntax could also serve to indicate an sRGB colorspace
interpretation of rgb triples.
rgb()
rgba()
hsl()
hsla()
[1]
http://linux.die.net/man/3/xparsecolor
e.g.
rgb:<red>/<green>/<blue>
rgbi:<red>/<green>/<blue>
CIEXYZ:<X>/<Y>/<Z>
CIEuvY:<u>/<v>/<Y>
CIExyY:<x>/<y>/<Y>
CIELab:<L>/<a>/<b>
CIELuv:<L>/<u>/<v>
TekHVC:<H>/<V>/<C>
- Re: Changes 2009-07-15/16 in branch?, (continued)
- Re: Changes 2009-07-15/16 in branch?, James Cloos, 2009/07/28
- Re: Changes 2009-07-15/16 in branch?, Richard Stallman, 2009/07/29
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/29
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/30
- Re: Changes 2009-07-15/16 in branch?, Chong Yidong, 2009/07/30
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/30
- Re: Changes 2009-07-15/16 in branch?, David De La Harpe Golden, 2009/07/27
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/28
- Message not available
- Re: Changes 2009-07-15/16 in branch?,
David De La Harpe Golden <=
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/27
- Re: Changes 2009-07-15/16 in branch?, Richard Stallman, 2009/07/28
- Re: Changes 2009-07-15/16 in branch?, Stefan Monnier, 2009/07/24
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/28
- Re: Changes 2009-07-15/16 in branch?, Chong Yidong, 2009/07/28
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/28
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/29
- Re: Changes 2009-07-15/16 in branch?, YAMAMOTO Mitsuharu, 2009/07/28
Re: Changes 2009-07-15/16 in branch?, Adrian Robert, 2009/07/24