/usr/share/movit/vignette_effect.frag is in libmovit4 1.3.1-1.
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 10 11 12 13 14 15 16 17 18 19 20 21 | // A simple, circular vignette, with a cos² falloff.
// Implicit uniforms:
// uniform float PREFIX(pihalf_div_radius);
//
// uniform vec2 PREFIX(aspect_correction);
// uniform vec2 PREFIX(flipped_center);
vec4 FUNCNAME(vec2 tc) {
vec4 x = INPUT(tc);
const float pihalf = 0.5 * 3.14159265358979324;
vec2 normalized_pos = (tc - PREFIX(flipped_center)) * PREFIX(aspect_correction);
float dist = (length(normalized_pos) - PREFIX(inner_radius)) * PREFIX(pihalf_div_radius);
float linear_falloff = clamp(dist, 0.0, pihalf);
float falloff = cos(linear_falloff) * cos(linear_falloff);
x.rgb *= vec3(falloff);
return x;
}
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