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Subject:	Re: [geda-user] [pcb-rnd] on IRIX - portability
To:	geda-user AT delorie DOT com
References:	<alpine DOT DEB DOT 2 DOT 00 DOT 1609170509090 DOT 7286 AT igor2priv>
	<3403488a-52a6-bf29-9ca5-207dda4d5ecc AT neurotica DOT com>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1609191806330 DOT 7286 AT igor2priv>
From:	"Girvin R. Herr (gherr375 AT sbcglobal DOT net) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID:	<cb66b9d6-cd7a-8515-82b3-2f9ab8dca7ce@sbcglobal.net>
Date:	Mon, 19 Sep 2016 11:27:53 -0700
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On 09/19/2016 09:20 AM, gedau AT igor2 DOT repo DOT hu wrote:
>
>
> On Mon, 19 Sep 2016, Dave McGuire (mcguire AT neurotica DOT com) [via 
> geda-user AT delorie DOT com] wrote:
>
>>  For my own use, though, while I'm following pcb-rnd development with
>> interest, the loss of transparency was a show-stopper for me.  I realize
>> you don't want to deal with OpenGL (which is definitely the best way to
>> do this), but isn't there a practical way to implement transparency
>> without it?
>
> I see the following options:
>
> I think gtk/gdk doesn't offer out-of-the-box usable 
> opacity/transparency with software render. This suggest we'd need to 
> do something like "render everthing manually in memory using 
> transparency, then copy the result into a gdk pixmap at the end". 
> Sounds like a lot of work and slow code at the end. Unless I missed 
> something looking at the APIs, this just wouldn't work.
>
> The short term solution would be resurrecting the opengl code (through 
> contribution or donation).
>
> I don't plan migration to gtk3, so my long term plan is an sdl2 based 
> HID, that will survive a gtk2 phase-out (I won't remove the gtk HID, 
> but distros will stop delivering the required libraries sooner or 
> later). As a side effect sdl2 has support for alpha channel both with 
> and without opengl so it would be much easier to solve there. I plan 
> to have optional transparency in the sdl HID. I don't know how good 
> the opengl support in sdl2 is, but it might also solve the gl problem. 
> There's no ETA on this project yet, it's a rathr big chunk. But as 
> cschem needs a GUI too, and it will definitely be sdl2 too, it will 
> happen sooner or later.
>
> Regards,
>
> Igor2
>
FYI:
My Slackware 14.1 comes with both gtk2 and gtk3.  However, it is my 
understanding that there are some conflicts with identical filenames 
between the two, so building apps may be a problem.  i.e. installing one 
trounces the file(s) of the other, so the other must be reinstalled if 
needed.  Fun.

My point of this is that the changeover has already started.  I do not 
know when gtk2 will be dropped from distros, but apps are starting to 
change to gtk3.  Filezilla, for one, already requires gtk3 as a 
dependency.  There are others and their numbers are increasing.  As you 
say, it will happen sooner or later.

Girvin Herr

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