From: Eli Zaretskii <eliz@gnu.org>
To: Aleksandar Dimitrov <mail@aleks.bg>, Po Lu <luangruo@yahoo.com>
Cc: 70697@debbugs.gnu.org
Subject: bug#70697: 30.0.50; Frame parameter alpha-background is ignored for fringe bitmaps & internal borders
Date: Thu, 09 May 2024 10:46:46 +0300 [thread overview]
Message-ID: <86ikzn77h5.fsf@gnu.org> (raw)
In-Reply-To: <871q6liz1x.fsf@aleks.bg> (message from Aleksandar Dimitrov on Wed, 01 May 2024 12:52:58 +0200)
> From: Aleksandar Dimitrov <mail@aleks.bg>
> Date: Wed, 01 May 2024 12:52:58 +0200
>
> Hi all,
>
> Runinng in any compositing window manager (this includes Wayland with a
> PGTK build of Emacs, but also X without PGTK), the frame parameter
> alpha-background is ignored for at least
>
> - fringe bitmaps
> - insets drawn with internal-border-width
>
> The resulting visual effect is quite jarring, and makes both of these
> difficult to use together with transparency.
>
> Here's a small emacs -Q script to exhibit the problem:
>
> #+begin_src emacs-lisp
>
> ;; Turn off scroll bars to make the bugs more visible.
> (scroll-bar-mode -1)
>
> ;; set transparency & internal border width.
> ;; Note how the internal border is going to be drawn in a solid white colour
> ;; and will ignore the alpha value.
> (modify-all-frames-parameters '((alpha-background . 50)
> (internal-border-width . 20)))
>
> (define-fringe-bitmap 'test-bitmap
> (vector (expt 2 15)) nil 16 '(top t))
>
> ;; Define a face for the fringe that has a different background colour, to
> ;; more easily discern the fringe bitmap bug from the internal border bug.
> (make-face 'test-face)
> (set-face-attribute 'test-face nil :background "pink")
>
> ;; Apply a fringe bitmap to all lines in the current buffer. Note how the fringe
> ;; bitmap is monochrome, but the background colour ignores the global alpha value.
> (defun apply-fringe-bitmap ()
> "Apply a fringe bitmap to the current buffer to exhibit the transparency bug."
> (add-text-properties
> (point-min) (point-max)
> '(wrap-prefix
> #(" " 0 1 (display (left-fringe test-bitmap test-face)))
> line-prefix
> #(" " 0 1 (display (left-fringe test-bitmap test-face))))))
>
> (add-hook 'emacs-startup-hook #'apply-fringe-bitmap)
>
> #+end_src
>
>
> And here's how it looks like: https://aleks.bg/emacs-bug.png
> (that's my personal home page, not an image hoster.)
>
> I would expect the white border around the frame to also be transparent,
> and the fringe, too.
Po Lu, any comments or ideas about this?
Thanks.
next prev parent reply other threads:[~2024-05-09 7:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-01 10:52 bug#70697: 30.0.50; Frame parameter alpha-background is ignored for fringe bitmaps & internal borders Aleksandar Dimitrov
2024-05-09 7:46 ` Eli Zaretskii [this message]
2024-05-09 8:03 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-05-16 14:26 ` Aleksandar Dimitrov
2024-06-01 14:03 ` Eli Zaretskii
2024-06-01 14:07 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-06-03 20:24 ` Aleksandar Dimitrov
2024-06-15 8:11 ` Eli Zaretskii
2024-06-15 11:20 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-06-27 7:41 ` Eli Zaretskii
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