Improvement of face remappings for org-present

Emacs
,
1

Following the guide in The Secrets of My Emacs Presentation Style - System Crafters I would like to present some additions / improvements, here.

  1. The first issue I took with the face remapping setup was, that did not allow me to use text-scale-adjust due to hard-coded font sizes.
  2. Also, it did not make use of Emacs’s provided infrastructure to make face remapping more robust.

Scalable face definitions

So, it turns out that it is easier to just remove the :height properties for the fixed-pitch and variable-pitch faces and define a font rescaling factor for the variable-pitch font. This way, you can just use your “intended” heights while mixing fixed- and variable-pitched fonts. If you stick to relative :height values during face remapping, all faces remain scalable with text-scale-adjust.

(add-to-list 'face-font-rescale-alist '("Iosevka Aile" . 1.1))
(set-face-attribute 'default nil :font "JetBrains Mono" :weight 'light :height 130)
(set-face-attribute 'fixed-pitch nil :inherit 'default :family "JetBrains Mono")
(set-face-attribute 'variable-pitch nil :font "Iosevka Aile" :weight 'light :height 130)

More robust face remapping

The new face remapping code looks as follows:

(defvar +org-present-face-remappings nil
  "List of cookies to reset face remappings when leaving org-present mode.")

(defun +org-present-remap-faces (&rest faces)
  (mapcar (lambda (x)
            (push (apply #'face-remap-add-relative x)
                  +org-present-face-remappings))
          faces))

(defun +org-present-start ()
  ...
  (+org-present-remap-faces
    '(default variable-pitch)
    '(header-line (:height 4.0) default)
    ...))

(defun +org-present-stop ()
  ...
  (dolist (face +org-present-face-remappings)
    (face-remap-remove-relative face))
  (setq +org-present-face-remappings nil))

You’ll notice that I don’t scale the default face in +org-present-start. That is because I am using org-present-big with a factor of 3. I found that to be more flexible.

Be aware, that with visual-fill-column-mode, image scaling is off when using :width <factor|percent> attributes. I am using a overriding advice on org-display-inline-image--width to fix that. I will leave the details for another topic if there is interest.

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