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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