/usr/share/movit/gamma_expansion_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 | // Expand gamma curve.
// Implicit uniforms:
// uniform float PREFIX(linear_scale);
// uniform float PREFIX(c0), PREFIX(c1), PREFIX(c2), PREFIX(c3), PREFIX(c4);
// uniform float PREFIX(beta);
vec4 FUNCNAME(vec2 tc) {
vec4 x = INPUT(tc);
vec3 a = x.rgb * PREFIX(linear_scale);
// Fourth-order polynomial approximation to pow(). See the .cpp file for details.
vec3 b = PREFIX(c0) + (PREFIX(c1) + (PREFIX(c2) + (PREFIX(c3) + PREFIX(c4) * x.rgb) * x.rgb) * x.rgb) * x.rgb;
vec3 f = vec3(greaterThan(x.rgb, vec3(PREFIX(beta))));
x = vec4(mix(a, b, f), x.a);
return x;
}
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