new effect suggestion: dim

[redxtech]

i used to use a fork of i3lock that had a dimblur effect option.

it would be great to be able to combine the existing blur effect with a new dim effect.

would this be reasonable to add?

[CcydtN]

I think you can achieve a similar effect using effect-vignette.
Set "factor" as 0 and "base" as the dim ratio (0 -- black, 1 -- original color)

Here is a clip of the related code, you can look at it and see if it match your needs.
If you want more detail, this code is in effect.c, at line 326.

double xf = (x * 1.0) / width;
double yf = (y * 1.0) / height;
double vignette_factor = base + factor * 16 * xf * yf * (1.0 - xf) * (1.0 - yf);

r = (int)(r * vignette_factor) & 0xFF;
g = (int)(g * vignette_factor) & 0xFF;
b = (int)(b * vignette_factor) & 0xFF;