Re: new frame-parameter "alpha"

[Seiji Zenitani <zenitani@mac.com>]

On 2008/03/18, at 16:11, Brian Cully wrote:
> On 15-Mar-2008, at 17:19, Stefan Monnier wrote:
>> Looks good.  Tho maybe I'd put the call to x_set_frame_alpha directly
>> inside x_update_cursor (and rename it to  
>> x_update_cursor_and_opacity).
>>
>> I don't mind the use of "alpha" rather than "opacity", as long as the
>> docstrings are clear.  The patch needs to also update the manual.
>> And could you describe the copyright status?
>
> 	Is this for background-color alpha or the god-forsaken total- 
> window alpha?

It's for the total frame including the tool bar, the fringes, the  
window title bar, and the proxy icon.

> At least on Mac OS X, you can set the background alpha by itself  
> which I find far more pleasing than when the entire frame goes semi- 
> opaque.


You are talking about Emacs.app, a coming Cocoa port.  I confirmed  
that Emacs.app comes with the background color alpha [e.g. (set- 
background-color "ARGBccffffff") ].

My concern is that the background alpha only works on Emacs.app on  
Mac OS X, a proprietary platform.  It would be nice if we can set the  
background alpha on X11, too, but I have no idea to implement it.

Seiji