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org-latex-preview: Tweak baseline alignment 

* lisp/org-latex-preview.el (org-latex-preview--update-overlay): After
doing quite a bit of testing, tweak the ascent formula to introduce a
slight correction to visually improve the final result.
This commit is contained in:
TEC 2023-01-03 16:39:51 +08:00
parent 85b284d7f6
commit 9884886692
Signed by: tec
SSH Key Fingerprint: SHA256:eobz41Mnm0/iYWBvWThftS0ElEs1ftBr6jamutnXc/A
1 changed files with 14 additions and 1 deletions
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lisp/org-latex-preview.el
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@ -326,7 +326,20 @@ indeed LaTeX fragments/environments.")
:file (car path-info)
:height (and height (cons (* height zoom) 'em))
:ascent (if (and depth height)
(ceiling (* 100 (- 1.0 (/ depth height))))
;; The baseline seems to tend to sit slightly
;; lower than it should be, and a very mild
;; bias seems to improve the visual result.
;; From testing with a collecting of LaTeX
;; maths fonts (cm, cmbright, arev, pxfonts,
;; notomath, nextxsf, eulervm) decreacing the
;; depth measurement by 0.02pt in the baseline
;; calculation seems to work well.
;; I have yet to come across any situation
;; where this results in a negative depth,
;; however we may as well ensure that never
;; occurs.
(round (* 100 (- 1 (/ (max 0.0 (- depth 0.02))
height))))
'center)))))
(overlay-put ov 'display image-display)
(overlay-put ov 'preview-image image-display)