On Thu, Oct 31, 2013 at 12:50 PM, Carsten Haitzler <ras...@rasterman.com> wrote:
> On Thu, 31 Oct 2013 22:53:37 +0900 Cedric BAIL <cedric.b...@free.fr> said:
>
>> On Thu, Oct 31, 2013 at 10:03 PM, Rafael Antognolli
>> <antogno...@gmail.com> wrote:
>> > On Thu, Oct 31, 2013 at 12:40 AM, Carsten Haitzler <ras...@rasterman.com>
>> > wrote:
>> >> On Thu, 31 Oct 2013 10:18:31 +0900 Cedric BAIL <cedric.b...@free.fr> said:
>> >>> On Thu, Oct 31, 2013 at 9:24 AM, Gustavo Sverzut Barbieri
>> >>> <barbi...@gmail.com> wrote:
>> >>> > On Wed, Oct 30, 2013 at 6:39 PM, Rafael Antognolli
>> >>> > <antogno...@gmail.com> wrote:
>> >>> >> On Tue, Oct 29, 2013 at 8:17 PM, Gustavo Sverzut Barbieri
>> >>> >> <barbi...@gmail.com> wrote:
>> >>> >>> On Tue, Oct 29, 2013 at 7:26 PM, Rafael Antognolli
>> >>> >>> <antogno...@gmail.com> wrote:
>> >>> >>>> Hey everyone,
>> >>> >>>>
>> >>> >>>> Our current API for setting a window as fullscreen does not support
>> >>> >>>> specifying which output/display/monitor should be used as
>> >>> >>>> fullscreen.
>> >>> >>>> However, wayland does support it.
>> >>> >>>>
>> >>> >>>> Would it make sense to have such parameter in the fullscreen_set
>> >>> >>>> API?
>> >>> >>>> Or should it be a wayland-only API?
>> >>> >>>
>> >>> >>> I'd say a new function fullscreen_at_display_set(Display_ID *did) /*
>> >>> >>> NULL = unset */
>> >>> >>>
>> >>> >>> the current version remains and sets on current display.
>> >>> >>> Alternatively
>> >>> >>> we could just move the window to another display before making that
>> >>> >>> fullscreen, no idea if this is okay.
>> >>> >>
>> >>> >> Yeah, current version sets on current display (the one where the
>> >>> >> non-fullscreen window is already displayed), unless it's the first
>> >>> >> time that the window is going to be displayed. Otherwise it will use
>> >>> >> the first output. But that's up to the compositor to choose so far,
>> >>> >> unless we explicitly specify which output to use.
>> >>> >>
>> >>> >>>> For the latter case, how would we do that? Maybe exposing an API
>> >>> >>>> that
>> >>> >>>> allows to set the "preferred" output, and then when fullscreen_set
>> >>> >>>> is
>> >>> >>>> called, it just uses that one?
>> >>> >>>
>> >>> >>> I'd say we need to make this in one go, unless we want some kind of
>> >>> >>> general assignment to one display (not just for FS mode).
>> >>> >>
>> >>> >> OK...
>> >>> >>
>> >>> >>>
>> >>> >>>> There's also a need to specify how the output should be referred to.
>> >>> >>>> Using an (unsigned) int, where 0 is the first output, 1 is the
>> >>> >>>> second, etc? Or maybe allowing to specify something like "always the
>> >>> >>>> biggest one in area", or the widest one, or whatever... any
>> >>> >>>> thoughts?
>> >>> >>>
>> >>> >>> We'd need a way to enumerate the displays (or whatever we call them,
>> >>> >>> like zone, etc), they should return their properties such as size,
>> >>> >>> position (?), capabilities (3d/stereo? color? what do we have here?)
>> >>> >>> and some string to make it easy to debug.
>> >>> >>>
>> >>> >>> we have the handle to it, so it can be windowsystem agnostic
>> >>> >>> (Display_ID *, which can be implemented differently for windows, x11,
>> >>> >>> wayland...)
>> >>> >>
>> >>> >> So you are proposing that we change a good portion of our API to be
>> >>> >> aware of multiple displays?
>> >>> >>
>> >>> >>>
>> >>> >>>> That reminds me that we still have another problem. APIs such
>> >>> >>>> ecore_wl_screen_size_get() return only the screen size of the first
>> >>> >>>> monitor, not both.
>> >>> >>>
>> >>> >>> same as above, this should be based on current window (if there is a
>> >>> >>> window handle) or the first one (if there is not, alterntively we can
>> >>> >>> state it will refer to screen the mouse is over, but I guess this is
>> >>> >>> incorrect and makes everything less predictable).
>> >>> >>
>> >>> >> Well, that API has no argument, so it just assumes the current output.
>> >>> >> For a given window, one could use ecore_evas_screen_geometry_get, and
>> >>> >> that indeed will be attached to a given display, but only after the
>> >>> >> Ecore_Evas has been shown first (at least on Wayland, if I'm not
>> >>> >> wrong).
>> >>> >>
>> >>> >>>> What about a common API to select which output we are talking about,
>> >>> >>>> that must be called before any call that would refer to a specific
>> >>> >>>> output? The problem with this is that it would make code very
>> >>> >>>> wayland-specific :-/
>> >>> >>>
>> >>> >>> how so? just use the opaque handlers and abstract stuff in there.
>> >>> >>
>> >>> >> OK, so you suggestion is something like:
>> >>> >>
>> >>> >> Display {
>> >>> >> ID;
>> >>> >> size;
>> >>> >> position; // might be some info from xrandr, like right-of another
>> >>> >> display, etc, if that is even possible
>> >>> >> capabilities (3d/stereo? color?)
>> >>> >> dpi (I'm not even sure if we can query different DPIs for different
>> >>> >> monitors, but I've seen discussion about future work on this on
>> >>> >> Wayland);
>> >>> >> }
>> >>> >>
>> >>> >> And then change/add some APIs to refer to a specific display when
>> >>> >> setting things?
>> >>> >
>> >>> > change is impossible at this time (abi/api stability) and cumbersome
>> >>> > for most apps that don't care.
>> >>>
>> >>> Indeed.
>> >>>
>> >>> > then we must add new apis for those apps that care (ie: a presentation
>> >>> > tool might offer a way to choose in which display to have a fullscreen
>> >>> > view of slides while the notes/timer may be fullscreen on another).
>> >>>
>> >>> Why not just a ecore_evas_screen_set/get/list() set of functions that
>> >>> will affect the screen attached to a window for all coming request on
>> >>> the pointed Ecore_Evas window ? That will limit the number of function
>> >>> we add and will not make the API to ugly in my point of view.
>> >>
>> >> i think this way is nicer. add a new api that sets a
>> >> requested/hinted/desired "screen" on a window and THEN if u fullscreen it
>> >> this requested screen is passed along with the fullscreen request to
>> >> wayland. in x it can be another atom/hint on the window and the wm can
>> >> decide what to do. a screen hint in wl and/or x11 could also be used AT
>> >> the time a window is mapped (shown). ie if set before window is shown,
>> >> then wm (or wl compositor) may assign the window to the requested screen
>> >> even if not fullscreen. it's useful in multiple ways. of course its a hint
>> >> - not an order. it can be ignored.
>> >
>> > Hmm... this is somehow close to what I proposed initially, but I think
>> > I wasn't that clear.
>> >
>> >> the question then is.. how to identify the screen. :)
>> >
>> > What about a struct, with (if needed) an ID, properties, and
>> > everything we can fetch from each screen/output? That would also
>> > remove the need for extra functions to fetch screen size, dpi, etc...
>>
>> The problem with a structure is that we need to figure it out quite a
>> lot in advance to have a stable ABI here. I think it is doable, but I
>> am not that sure. Don't forget 3D screen and reading distance if we
>> can figure it out at some point.
>
> if we create a screen OBJECT and make it an opaque handle.. we can extend
> until
> the cows come home safely... :)
I like this one, though it will imply in more than just 3 extra
functions. It should be at least one extra function per
property/query.
Anyway, can I follow this route?
> ------------- Codito, ergo sum - "I code, therefore I am" --------------
> The Rasterman (Carsten Haitzler) ras...@rasterman.com
>
>
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Rafael Antognolli
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