unplugged-system/external/skia/resources/sksl/shared/TextureSharpen.sksl

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/*#pragma settings Sharpen*/
layout(binding=0) uniform sampler2D s;
void main() {
float4 a = sample(s, float2(0));
float4 b = sample(s, float3(0));
sk_FragColor = half4(half2(a.xy), half2(b.xy));
}