Two related questions
- Is it possible to use opacity while theming in emacs? I mean defining theme which - for example - would add 25% of blue to the background color of elements it is applied to. Or which would make font 30% lighter.
Or, if not.
- Is it possible to dynamically recalculate some theme properties whenever main custom theme changes?
Such a thing would be great for various „add-some-mark” modes. One case I mean specifically is flycheck-error face, which would be less invasive if it gave background slight red accent instead of underlining text.
But my main case is crosshairs mode (which combines highlighting current row and current column). I configured it to use background slightly different than default, and that created nice subtle indication of cursor location. But once I started switching themes more often, it turned out to be nuisance, as proper color depends on current background.