/usr/share/movit/complex_modulate_effect.frag is in libmovit2 1.1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | uniform vec2 PREFIX(num_repeats);
vec4 FUNCNAME(vec2 tc) {
vec4 pixel = INPUT1(tc);
vec2 pattern = INPUT2(tc * PREFIX(num_repeats)).xy;
// Complex multiplication between each of (pixel.xy, pixel.zw) and pattern.xy.
return pattern.x * pixel + pattern.y * vec4(-pixel.y, pixel.x, -pixel.w, pixel.z);
}
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