Hi
I use a dark theme in Emacs. For a long time I have been annoyed by not
being able to see script chars ^ or _ (dark red in dark background) like in
$x^2$.
Reading font-latex.el I realized that face definition for
`font-latex-script-char-face'
has the following:
(defface font-latex-script-char-face
(let ((font '(:inherit underline)))
`((((class grayscale) (background light))
(:foreground "DarkGray" ,@font))
(((class grayscale) (background dark))
(:foreground "gray" ,@font))
(((class color) (background light))
(:foreground "salmon")) <<<------ salmon is light color
(((class color) (background dark))
(:foreground "DarkRed")) <<<------- DarkRed is dark color
(t (,@font))))
"Face used for the script chars ^ and _."
:group 'font-latex-highlighting-faces)
So it uses light color (salmon) in light background and dark color
(DarkRed) in dark background, probably a typo exchanging colors (it should
be the other way around).
Also, italic and bold faces (arguments of \textit and \textbf) have poor
contrast in dark color themes (OliveDrab, a dark olive-like color in dark
background), so I decided to check all faces in font-latex.el.
After a lot of work, I can summarize it as:
- replace OliveDrab (dark) by OliveDrab2 (light) in dark background.
- replace RosyBrown (light) by RosyBrown4 (mid-dark) in light background.
- replace DarkGray (surprise: it is light!!!) by gray25 (dark) in light
background.
- exchange DarkRed <-> salmon to get proper contrast.
PS.: Dark colors have luminance < 0.5. To compute color luminance, convert
to HSL (hue saturation luminance) and get 3rd arg:
(nth 2 (apply 'color-rgb-to-hsl (color-name-to-rgb COLOR-NAME)))
To help, I created a patch file for font-latex.el for auctex-14.0.6,
attached.
Best regards
Miguel
--
Miguel Vinicius Santini Frasson
mvsfras...@gmail.com
--- /home/sme/.emacs.d/elpa/auctex-14.0.6/font-latex.el 2024-07-25 00:59:09.944791937 -0300
+++ font-latex-proposed.el 2024-07-25 01:04:41.936662931 -0300
@@ -1152,7 +1152,7 @@
(((class color) (background light))
(:foreground "DarkOliveGreen" ,@font))
(((class color) (background dark))
- (:foreground "OliveDrab" ,@font))
+ (:foreground "OliveDrab2" ,@font))
(t (,@font))))
"Face used to highlight text to be typeset in bold."
:group 'font-latex-highlighting-faces)
@@ -1166,7 +1166,7 @@
(((class color) (background light))
(:foreground "DarkOliveGreen" ,@font))
(((class color) (background dark))
- (:foreground "OliveDrab" ,@font))
+ (:foreground "OliveDrab2" ,@font))
(t (,@font))))
"Face used to highlight text to be typeset in italic."
:group 'font-latex-highlighting-faces)
@@ -1180,7 +1180,7 @@
(((class color) (background light))
(:foreground "DarkOliveGreen" ,@font))
(((class color) (background dark))
- (:foreground "OliveDrab" ,@font))
+ (:foreground "OliveDrab2" ,@font))
(t (,@font))))
"Face used to highlight text to be underlined."
:group 'font-latex-highlighting-faces)
@@ -1218,7 +1218,7 @@
(((class grayscale) (background dark))
(:foreground "LightGray" ,@font))
(((class color) (background light))
- (:foreground "RosyBrown"))
+ (:foreground "RosyBrown4"))
(((class color) (background dark))
(:foreground "LightSalmon"))
(t (,@font))))
@@ -1266,13 +1266,13 @@
(defface font-latex-script-char-face
(let ((font '(:inherit underline)))
`((((class grayscale) (background light))
- (:foreground "DarkGray" ,@font))
+ (:foreground "gray25" ,@font))
(((class grayscale) (background dark))
(:foreground "gray" ,@font))
(((class color) (background light))
- (:foreground "salmon"))
- (((class color) (background dark))
(:foreground "DarkRed"))
+ (((class color) (background dark))
+ (:foreground "salmon"))
(t (,@font))))
"Face used for the script chars ^ and _."
:group 'font-latex-highlighting-faces)
