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Re: Sv: Sv: Support for background transparency

From: Håkon Flatval
Subject: Re: Sv: Sv: Support for background transparency
Date: Sun, 23 Jan 2022 22:43:04 +0100
User-agent: mu4e 1.6.10; emacs 27.2

> - Something answering the question: "what's the difference between
> this and the existing 'alpha frame parameter",

I added paragraph after that for alpha with a brief description.
I have included it in the attached patch. For convenience, I'm
reciting the relevant part here:

   diff --git a/doc/lispref/frames.texi b/doc/lispref/frames.texi
   index 2eeb8b7ed7..05d0b1a72a 100644
   --- a/doc/lispref/frames.texi
   +++ b/doc/lispref/frames.texi
   @@ -2433,6 +2433,16 @@ Font and Color Parameters

    Some window systems do not support the @code{alpha} parameter for child
    frames (@pxref{Child Frames}).
   +@vindex alpha-background@r{, a frame parameter}
   +@item alpha-background
   +@cindex opacity, frame
   +@cindex transparency, frame
   +Sets the background transparency of the frame. Unlike the @code{alpha}
   +frame parameter, this only controls the transparency of the background
   +while keeping foreground elements such as text fully opaque.
   +It should be an integer between 0 and 100, where 0 means
   +completely transparent and 100 means completely opaque (default).
    @end table

    The following frame parameters are semi-obsolete in that they are

Please let me know if this is what you had in mind or if I should revise

> - a commit message containing a description of the changes in
> ChangeLog format

I have attached a file with a changelog entry. I'm also giving it here
for convenience:

   2022-01-23  Håkon Flatval  <hkon20@hotmail.com>
        Add support for background transparency

        * src/haikufns.c:
        * src/nsfns.m:
        * src/pgtkfns.c:
        * src/w32fns.c:
        * src/xfns.c: Add alpha-background frame parameter defaults. Prefer to 
use 32-bit depth visual in X.
        * src/frame.h:
        * src/frame.c: Add alpha-background frame parameter and setter function.
        * src/gtkutil.c: Setup GTK to allow transparency.
        * src/xterm.c: Draw background transparent using alpha-background frame 
        * doc/lispref/frames.texi: Add docs for alpha-background frame parameter

Let me know if it needs changes.

I'm a little confused as to where I should put this. Should I add it to
one of the Changelog files?

Best regards,

Attachment: gdk-cairo-background-transparency-007.patch
Description: Text Data

Attachment: alpha-background-changelog
Description: Binary data

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