/usr/share/kde4/apps/kwin/shaders/1.10/logout-blur.frag is in kde-window-manager-common 4:4.11.8-0ubuntu6.
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 sampler2D sampler;
uniform float u_alphaProgress;
varying vec2 varyingTexCoords;
void main() {
gl_FragColor = texture2D(sampler, varyingTexCoords, 1.75);
gl_FragColor.a = u_alphaProgress;
}
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