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From: Matt Huszagh <huszaghmatt@gmail.com>
To: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>
Subject: Re: Patch to allow adjusting latex fragment display scale factor
Date: Sun, 10 Oct 2021 21:40:36 -0700	[thread overview]
Message-ID: <87pmscxjgb.fsf@gmail.com> (raw)
In-Reply-To: <87sfx8xjte.fsf@gmail.com>

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Matt Huszagh <huszaghmatt@gmail.com> writes:

> I've created a patch to allow adjusting the scale factor used for inline
> latex image fragments. This involves a customizable variable that can
> either be set to a scale factor (defaults to 1.0) or a function that
> evaluates to a scale factor.
> This feature is in addition to the existing scale factor adjustment
> capability provided by `org-preview-latex-process-alist' through
> `:image-size-adjust'. Wherease image-size-adjust performs scaling at the
> time of image generation, the new change performs it during
> display. This can lead to significant time saving and suffers no loss of
> quality for vector graphics.
> As an example of use, I have several functions for changing frame
> scaling. I've added
> (if (eq major-mode 'org-mode)
>       (progn
>         (org-clear-latex-preview)
>         ;; 16 corresponds to the C-u C-u arg prefix.
>         (org-latex-preview 16)))
> to these functions so that changing the frame scaling also
> correspondingly changes the latex preview/fragment scaling to match the
> new size of the surrounding text. Because of this new feature, this
> change is effectively instantaneous for reasonably numbers of
> overlays. Obviously, something similar could be done for
> `text-scale-adjust' (e.g., through `advice-add').
> Feedback appreciated.

Apologies, the patch I sent is slightly wrong. The line numbers also
reflect an earlier patch I made. Here is a corrected version.

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From 3c0e74a8659edb52c1200a02f8a20216b348c4ac Mon Sep 17 00:00:00 2001
From: Matt Huszagh <huszaghmatt@gmail.com>
Date: Sun, 10 Oct 2021 21:20:31 -0700
Subject: [PATCH] org.el: Allow customizing overlay-put scale factor

* lisp/org.el (org-latex-fragment-scale): Add customizable variable
that is equal to or evaluates to a scale factor used to scale inline
latex fragments.
(org--make-preview-overlay): Adjust latex fragment overlay generation
to account for the new custom scale factor.
 lisp/org.el | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/lisp/org.el b/lisp/org.el
index 405f0f0f9..052212efb 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -320,6 +320,15 @@ identifier."
   :version "24.1"
   :group 'org-id)
+(defcustom org-latex-fragment-scale 1.0
+  "Scaling factor used for LaTeX image fragments.
+This can either be a number or a function that takes the image
+data and image type as parameters and evaluates to a number.  The
+function can be useful for context-aware scaling, such as setting
+the scale factor to be consistent with the surrounding text size."
+  :type '(number function)
+  :group 'org)
 ;;; Version
@@ -15936,7 +15945,13 @@ as a string.  It defaults to \"png\"."
 			 (delete-overlay o))))
     (overlay-put ov
-		 (list 'image :type imagetype :file image :ascent 'center))))
+		 (list 'image
+                       :type imagetype
+                       :file image
+                       :ascent 'center
+                       :scale (if (functionp org-latex-fragment-scale)
+                                  (funcall org-latex-fragment-scale image imagetype)
+                                org-latex-fragment-scale)))))
 (defun org-clear-latex-preview (&optional beg end)
   "Remove all overlays with LaTeX fragment images in current buffer.

      reply	other threads:[~2021-10-11  4:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-11  4:32 Patch to allow adjusting latex fragment display scale factor Matt Huszagh
2021-10-11  4:40 ` Matt Huszagh [this message]

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