GNU bug report logs - #77429
31.0.50; Image map and display slice on mode/header/tab line

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: David Ponce <da_vid <at> orange.fr>
Subject: bug#77429: closed (Re: bug#77429: 31.0.50; Image map and display
 slice on mode/header/tab line)
Date: Wed, 02 Apr 2025 14:03:04 +0000

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Your bug report

#77429: 31.0.50; Image map and display slice on mode/header/tab line

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 77429 <at> debbugs.gnu.org.

-- 
77429: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=77429
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: David Ponce <da_vid <at> orange.fr>
Cc: 77429-done <at> debbugs.gnu.org
Subject: Re: bug#77429: 31.0.50; Image map and display slice on
 mode/header/tab line
Date: Wed, 02 Apr 2025 17:01:54 +0300

> Date: Wed, 2 Apr 2025 15:50:01 +0200
> Cc: 77429 <at> debbugs.gnu.org
> From: David Ponce <da_vid <at> orange.fr>
> 
> >> But on the sliced image which is on the left side on the header line,
> >> showing a green and blue rectangle, a click on the green rectangle
> >> displays "Red" instead of "Green" and click on the blue rectangle
> >> displays "Green" instead of "Blue".  This is the issue.
> >>
> >> Hope I am clear enough.
> > 
> > Yes, thanks.  Should be fixed now on the master branch.
> 
> Yes, I confirm the bug is now fixed.
>  From my side, you can close this report.

Done.

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From: David Ponce <da_vid <at> orange.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Image map and display slice on mode/header/tab line
Date: Tue, 1 Apr 2025 15:06:49 +0200

Hello,

I discovered an inconsistency in the interpretation of image map
coordinates when the sliced image is displayed, depending on whether it's
displayed in a buffer or in a mode, header or tab line.

When the sliced image is displayed in a buffer, the image coordinates
remain relative to the unclipped image, which looks correct to me.  But,
it is no longer the case when the image is displayed in a mode, header
or tab line: then the image map coordinates become relative to the
visible portion of the image, which renders the map unusable.  The
following code illustrates the problem:

(require 'svg)
(let* ((w 304)
       (h (frame-char-height))
       (svg (svg-create w h)))
  (svg-rectangle svg 0   0 100 h :fill "red")
  (svg-rectangle svg 102 0 100 h :fill "green")
  (svg-rectangle svg 204 0 100 h :fill "blue")
  (let* ((img (svg-image svg :scale 1
                         :map
                         `(
                           ((rect . ((0   . 0) . (100 . ,h)))
                            r (help-echo "RED"   pointer hand))
                           ((rect . ((102 . 0) . (202 . ,h)))
                            g (help-echo "GREEN" pointer hand))
                           ((rect . ((204 . 0) . (304 . ,h)))
                            b (help-echo "BLUE"  pointer hand))
                           )))
         (full (propertize " " 'display img))
         (cut  (propertize " " 'display `((slice 102 0 202 1.0) ,img)))
         (both (concat cut " " full)))
    (setq header-line-format both)
    (insert both "\n")))

I'm reporting this inconsistency, at least to find out if it's a real
bug or a limitation that needs to be addressed by the programmer.

Thanks


In GNU Emacs 31.0.50 (build 5, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.0) of 2025-03-31
Repository revision: 6f311883d246df87fa3ed9c24dbb39078e3fd69f
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Fedora Linux 40 (KDE Plasma)

Configured using:
 'configure --with-native-compilation=no'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINERAMA XINPUT2 XPM
XRANDR GTK3 ZLIB

Important settings:
  value of $LC_TIME: fr_FR.utf8
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  minibuffer-regexp-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

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