Re: [TCLCORE] New TIP #706: Expose three Tk "In Context" functions via stubs table

[Francois V. <fvo...@fr...>]

In Tk, the macOS platform is the only one for which TK_DRAW_IN_CONTEXT 
is defined, leading to the InContext measuring/drawing functions being 
called. I can't tell why exactly, it must be due to mac-specificities of 
some kind, it's a different way of measuring/drawing characters than on 
other platforms.

On Windows and Linux, Tk does not use any InContext functions(*). No 
context is actually used when measuring or drawing a string. If they 
would be called, the InContext functions just call the out-of-context 
variants (I have documented this in my proposed implementation in the 
tip-706 branch).

/(*) Tk_UnderlineCharsInContext() actually is called by 
Tk_UnderlineChars() on all platforms, however 
Tk_UnderlineCharsInContext() just makes two calls to 
Tk_MeasureCharsInContext(), which on Linux and Windows is 
Tk_MeasureChars(), so the statement "On Windows and Linux, Tk does not 
use any InContext functions" can really be seen as true./

F.

Le 01/12/2024 à 03:54, Marc Culler a écrit :
> I don't know the answer, but I suspect that they are needed on all 
> platforms but only (currently) used on macOS.  The difference from the 
> ones without the context in the name seems to be how end of line 
> markers are handled.
>
> - Marc
>
> On Sat, Nov 30, 2024 at 8:35 PM Kevin Walzer <kw...@co...> wrote:
>
>     I'm curious - why are these functions needed on macOS and not
>     X11/Windows?
>
>     On 11/30/24 10:52 AM, Francois Vogel wrote:
>     > Hi all,
>     >
>     > This is to let you know that I have written a new TIP:
>     >
>     > https://core.tcl-lang.org/tips/doc/trunk/tip/706.md
>     >
>     > The goal is to expose 3 Tk functions in the stubs table. This is
>     > needed to let rtext (the revised text widget as a TEA package)
>     build
>     > and link under macOS aqua. About rtext:
>     >
>     > https://chiselapp.com/user/fvogel/repository/rtext
>     >
>     > Comments, thoughts, all welcome. Depending on the feedback I
>     get, vote
>     > will be triggered in possibly less than a week.
>     >
>     > Regards,
>     >
>     > Francois
>     >
>     >
>     >
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