[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#70697: 30.0.50; Frame parameter alpha-background is ignored for frin
From: |
Aleksandar Dimitrov |
Subject: |
bug#70697: 30.0.50; Frame parameter alpha-background is ignored for fringe bitmaps & internal borders |
Date: |
Wed, 01 May 2024 12:52:58 +0200 |
User-agent: |
mu4e 1.12.1; emacs 30.0.50 |
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.
Aleks
- bug#70697: 30.0.50; Frame parameter alpha-background is ignored for fringe bitmaps & internal borders,
Aleksandar Dimitrov <=