Visual Effect (visual-effect)

Built-in visual effects for Surface.

API

Function	Description
`surface_effect_glass(s, clip, x, y, w, h, radius)`	Frosted glass blur effect
`surface_effect_shadow(s, clip, x, y, w, h, radius, c)`	Drop shadow
`surface_effect_gradient(s, clip, x, y, w, h, lt, rt, rb, lb)`	Four-corner bilinear gradient
`surface_effect_checkerboard(s, clip, x, y, w, h)`	Checkerboard transparency pattern

Effect	Description
Frosted Glass	Applies a blur effect to the specified region, simulating frosted glass texture
Drop Shadow	Draws a blurred colored shadow below the region
Gradient	Specifies colors at four corners with bilinear interpolation filling the interior
Checkerboard	Draws a checkerboard pattern to display transparent regions