saturation.rs

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/*
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 * Copyright (C) 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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#pragma version(1)
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#pragma rs java_package_name(com.example.android.basicrenderscript)
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#pragma rs_fp_relaxed
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const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
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float saturationValue = 0.f;
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/*
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RenderScript kernel that performs saturation manipulation.
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*/
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uchar4 __attribute__((kernel)) saturation(uchar4 in)
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{
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    float4 f4 = rsUnpackColor8888(in);
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    float3 result = dot(f4.rgb, gMonoMult);
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    result = mix( result, f4.rgb, saturationValue );
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    return rsPackColorTo8888(result);
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}
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