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Implement a color-dark-p function on Emacs versions < 29

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Steven Allen 2024-01-13 10:30:26 -08:00
parent c1e622b85d
commit 3eed74e5c7
1 changed files with 15 additions and 1 deletions
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16
exwm-xsettings.el
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@ -181,6 +181,20 @@ These settings take precedence over `exwm-xsettings-theme' and
(owner :initarg :owner :type xcb:WINDOW)) ;new slot
:documentation "An XSETTINGS client message.")
(defalias 'exwm-xsettings--color-dark-p
(if (eval-when-compile (< emacs-major-version 29))
;; Borrowed from Emacs 29.
(lambda (rgb)
"Whether RGB is more readable against white than black."
(unless (<= 0 (apply #'min rgb) (apply #'max rgb) 1)
(error "RGB components %S not in [0,1]" rgb))
(let* ((r (expt (nth 0 rgb) 2.2))
(g (expt (nth 1 rgb) 2.2))
(b (expt (nth 2 rgb) 2.2))
(y (+ (* r 0.2126) (* g 0.7152) (* b 0.0722))))
(< y 0.325)))
'color-dark-p))
(defun exwm-xsettings--pick-theme (theme)
"Pick a light or dark theme from the given THEME.
If THEME is a string, it's returned directly.
@ -189,7 +203,7 @@ the default face's background color."
(pcase theme
((cl-type string) theme)
(`(,(cl-type string) . ,(cl-type string))
(if (color-dark-p (color-name-to-rgb (face-background 'default)))
(if (exwm-xsettings--color-dark-p (color-name-to-rgb (face-background 'default)))
(cdr theme) (car theme)))
(_ (error "Expected theme to be a string or a pair of strings"))))