/usr/share/movit/dither_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 10 11 12 13 14 15 16 17 18 19 20 21 | uniform sampler2D PREFIX(dither_tex);
uniform vec2 PREFIX(tc_scale);
uniform float PREFIX(round_fac), PREFIX(inv_round_fac);
vec4 FUNCNAME(vec2 tc) {
vec4 result = INPUT(tc);
// Don't dither alpha; the case of alpha=255 (1.0) is very important to us,
// and if there's any inaccuracy earlier in the chain so that it becomes e.g.
// 254.8, it's better to just get it rounded off than to dither and have it
// possibly get down to 254. This is not the case for the color components.
result.rgb += tex2D(PREFIX(dither_tex), tc * PREFIX(tc_scale)).xxx;
// NEED_EXPLICIT_ROUND will be #defined to 1 if the GPU has inaccurate
// fp32 -> int8 framebuffer rounding, and 0 otherwise.
#if NEED_EXPLICIT_ROUND
result = round(result * vec4(PREFIX(round_fac))) * vec4(PREFIX(inv_round_fac));
#endif
return result;
}
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