uniform lowp sampler2D cyan;
uniform lowp sampler2D magenta;
uniform lowp sampler2D yellow;
uniform lowp sampler2D black;
varying highp vec2 qt_TexCoord0;
uniform lowp float qt_Opacity;
void main() {
    highp vec2 t = qt_TexCoord0 * 3. - 1.;
    lowp float c = texture2D(cyan, t + vec2(.05, .09)).a;
    lowp float m = texture2D(magenta, t + vec2(.04, -.10)).a;
    lowp float y = texture2D(yellow, t + vec2(-.10, .01)).a;
    lowp float k = texture2D(black, t).a;
    gl_FragColor = 1. - vec4(c + k, m + k, y + k, 0.);
}