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uniform sampler2D dst_texture;
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uniform sampler2D mask_texture;
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uniform vec2 inv_mask_size;
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uniform vec2 inv_dst_size;
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uniform vec2 mask_offset;
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uniform vec4 mask_channel;
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float mask()
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{
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return dot(mask_channel, texture2D(mask_texture, (gl_FragCoord.xy + mask_offset) * inv_mask_size));
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}
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void main()
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{
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vec4 dst = texture2D(dst_texture, gl_FragCoord.xy * inv_dst_size);
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// combine clip and coverage channels
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float mask_alpha = mask();
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gl_FragColor = mix(dst, composite(brush(), dst), mask_alpha);
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}
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