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Re: XDestroyImage()

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.unix.programmer, comp.windows.x
Subject Re: XDestroyImage()
Date 2023-11-15 12:32 +0000
Organization A noiseless patient Spider
Message-ID <87bkbvkxi6.fsf@bsb.me.uk> (permalink)
References <uiqsp7$54ll$1@dont-email.me> <uir1o9$5nkq$1@dont-email.me> <uisvuj$kdn3$1@dont-email.me> <871qctfnuo.fsf@nosuchdomain.example.com>

Cross-posted to 2 groups.

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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> Muttley@dastardlyhq.com writes:
>> On Sun, 12 Nov 2023 12:24:25 -0500
>> James Kuyper <jameskuyper@alumni.caltech.edu> wrote:
>>>In comp.unix.programmer Muttley@dastardlyhq.com wrote:
>>>> I'm a bit uncertain from the man page and from googling around whether 
>>>> XDestroyImage() only frees the XImage structure created by XCreateImage()
>>>> or whether it also frees the user allocated memory that gets passed into
>>>> XCreateImage().
>>>
>>>The man page that I found describing the XDestroyImage macro says, quite
>>>prominently:
>>>
>>>"Note that when the image is created using XCreateImage(), XGetImage(),
>>>or XSubImage(), the destroy procedure that this macro calls frees both
>>>the image structure and the data pointed to by the image structure."
>>>
>>>Does the manpage you viewed lack that statement?
>>
>> Yes. All it says is:
>>
>> "The XDestroyImage function deallocates the memory associated with the 
>> XImage structure."
>>
>> Which is ambiguous.
>
> That's very surprising.  Looking at a Git mirror of libX11
> (https://github.com/mirror/libX11), that "Note that" paragraph appears
> in every version of that man page going back to 2003 (X11R6.6).
>
> On my system, Ubuntu 22.04, I get:
>
> $ man XDestroyImage | wc -l
> 139
> $ man XDestroyImage | tail -n 1
> X Version 11                     libX11 1.7.5                  XCreateImage(3)
> $ man XDestroyImage | sed -n '/Note that/,+3p'
>        Note that when the image is created using XCreateImage,  XGetImage,  or
>        XSubImage,  the destroy procedure that the XDestroyImage function calls
>        frees both the image structure and the data pointed  to  by  the  image
>        structure.
> $
>
> What do you get on your system?  (You mentioned that you're on a Mac.)

Just as a random data point, on a Mac I have access to (but don't
understand well enough to say anything reliable about what software it
has installed) I get this:

$ man XDestroyImage | wc -l
     140
$ man XDestroyImage | tail -n 1
X Version 11                     libX11 1.5.0                  XCreateImage(3)
$ man XDestroyImage | sed -n '/Note that/,+3p'
       Note that when the image is created using XCreateImage, XGetImage, or
       XSubImage, the destroy procedure that the XDestroyImage function calls
       frees both the image structure and the data pointed to by the image
       structure.

-- 
Ben.

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Thread

XDestroyImage() Muttley@dastardlyhq.com - 2023-11-12 15:59 +0000
  Re: XDestroyImage() kalevi@kolttonen.fi (Kalevi Kolttonen) - 2023-11-12 16:20 +0000
    Re: XDestroyImage() Muttley@dastardlyhq.com - 2023-11-12 16:30 +0000
  Re: XDestroyImage() James Kuyper <jameskuyper@alumni.caltech.edu> - 2023-11-12 12:24 -0500
    Re: XDestroyImage() Muttley@dastardlyhq.com - 2023-11-13 11:05 +0000
      Re: XDestroyImage() Winston <wbe@UBEBLOCK.psr.com.invalid> - 2023-11-13 11:53 -0500
      Re: XDestroyImage() Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-11-13 11:35 -0800
        Re: XDestroyImage() Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-11-15 12:32 +0000
  Re: XDestroyImage() scott@slp53.sl.home (Scott Lurndal) - 2023-11-12 17:34 +0000
    Re: XDestroyImage() candycanearter07 <no@thanks.net> - 2023-11-12 19:11 -0600
    Re: XDestroyImage() Muttley@dastardlyhq.com - 2023-11-13 11:06 +0000
      Re: XDestroyImage() scott@slp53.sl.home (Scott Lurndal) - 2023-11-13 14:59 +0000
        Re: XDestroyImage() Muttley@dastardlyhq.com - 2023-11-13 15:57 +0000
      Re: XDestroyImage() Nicolas George <nicolas$george@salle-s.org> - 2023-11-14 16:12 +0000
        Re: XDestroyImage() candycanearter07 <no@thanks.net> - 2023-11-15 11:35 -0600
          Re: XDestroyImage() Muttley@dastardlyhq.com - 2023-11-16 08:51 +0000
            Re: XDestroyImage() candycanearter07 <no@thanks.net> - 2023-11-19 21:07 -0600

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