Bug#1008481: Add SDL_IM_MODULE to fcitx4 and fcitx5
On Tue, Mar 29, 2022 at 3:58 PM Shengjing Zhu <zhsj@debian.org> wrote:
>
> On Tue, Mar 29, 2022 at 3:13 PM Osamu Aoki <osamu@debian.org> wrote:
> >
> > Hi,
> >
> > Let me assess situation more verbosely.
> >
> > > -----Original Message-----
> > > From: Shengjing Zhu <zhsj@debian.org>
> > > To: Gunnar Hjalmarsson <gunnarhj@debian.org>
> > > Cc: 1008481@bugs.debian.org, Osamu Aoki <osamu@debian.org>
> > > Subject: Re: Bug#1008481: Add SDL_IM_MODULE to fcitx4 and fcitx5
> > > Date: Tue, 29 Mar 2022 03:27:36 +0800
> > >
> > > On Tue, Mar 29, 2022 at 3:05 AM Gunnar Hjalmarsson <gunnarhj@debian.org> wrote:
> > > >
> > > > On 2022-03-28 08:28, Shengjing Zhu wrote:
> > > > > On Mon, Mar 28, 2022 at 11:37 AM Osamu Aoki <osamu@debian.org> wrote:
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > These bugs seem ***somewhat*** similar:
> >
> > Yes, I understand these are not the same problem.
> >
> > With your explanation, I think I am clear about issues.
> >
> > > > > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990316
> > > > > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1008481
> > > > > >
> > > > >
> > > > > AFAICT, GLFW_IM_MODULE is different from SDL_IM_MODULE.
> > > > >
> > > > > I can't find GLFW_IM_MODULE in glfw code, it only appears in kitty's glfw fork.
> >
> > The upstream of glfw doesn't support GLFW_IM_MODULE.
> >
> > The vendored copy of glfw in the popular kitty supports GLFW_IM_MODULE and kitty
> > upstream still advises not to enable this input method support as the default
> > setting.
> >
> > So we decided not to enable it from im-config
> >
> > Since fcitx5 uses the same protocol as ibus, documented proposed workaround was to
> > set GLFW_IM_MODULE=ibus for both ibus case and fcitx5 case. fcitx4 isn't supported
> > and no proposed setting.
> >
> > > > > But SDL_IM_MODULE can be found in sdl2 code.
> > > > > Ref:
> > > > >
> > > https://github.com/libsdl-org/SDL/blob/120c76c8/src/core/linux/SDL_ime.c#L46-L49
> >
> > The upstream of sdl in Debian has been supporting fcitx via SDL_IM_MODULE for some
> > time.
> >
> > No popular programs in Debian used modern sdl2 so the support of fcitx via
> > SDL_IM_MODULE was never raised nor addressed in im-config. It should have been and
> > is a valid feature addition case for im-config.
> >
> > > ...
> > > 2. Changing sdl2 upstream takes too long to propagate. SDL_IM_MODULE
> > > appeared in sdl2 since 2016
> > > https://github.com/libsdl-org/SDL/commit/808c75d1
> > > User asks for this for Dota2 game, which seems hard to get sdl2 updated...
> >
> > The vendored copy of sdl2 in the popular non-Debian DOTA finally got updated and now
> > support of fcitx (fcitx4?) via SDL_IM_MODULE is a desirable feature. So there is
> > significant desire to set up fcitx for sdl2 from the user.
> >
> > We know from glfw discussion, fcitx4 and fcitx5 uses different protocol.
> > (fcitx5==ibus)
> >
> > My question is what is the correct value for SDL_IM_MODULE which works with Debian's
> > sdl2 and DOTA's sdl2?.
> >
> > ibus --> no setting for SDL_IM_MODULE
> > fcitx (fcitx4) --> SDL_IM_MODULE=fcitx
> > fcitx5 --> SDL_IM_MODULE=fcitx5 or SDL_IM_MODULE=ibus
> >
>
> Just to answer the protocol part.
>
> IMO, there are at least 4 protocols that fcitx5 supports.
> + fcitx5, at dbus org.fcitx.Fcitx-0
> + fcitx4, at dbus org.fcitx.Fcitx5
Typo: the bus address for fcitx4 and fcitx5 should be exchanged.
> + dbus, at dbus address org.freedesktop.portal.Fcitx
> + ibus, at dbus address org.freedesktop.portal.IBus
>
> Both fcitx4 and fcitx5 have a dbus frontend, and they listen on the
> same address.
> sdl2 implements fcitx support with dbus frontend. So both fcitx4 and
> fcitx5 support it.
>
> For kitty, it only supports ibus, but it can also connect to fcitx5's
> ibus frontend.
> For sdl2, it supports ibus, so it can connect to fcitx5's ibus
> frontend as well, but since there's native fcitx support, using fcitx
> dbus frontend is preferred.
>
> In conclusion,
>
> For SDL_IM_MODULE
>
> + fcitx(fcitx4) --> SDL_IM_MODULE=fcitx
> + fcitx5 --> SDL_IM_MODULE=fcitx
> + ibus --> no setting
> + others --> no settings
>
--
Shengjing Zhu
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