1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma version(1)
18 #pragma rs java_package_name(com.example.android.basicrenderscript)
19 #pragma rs_fp_relaxed
20 
21 const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
22 
23 float saturationValue = 0.f;
24 
25 /*
26 RenderScript kernel that performs saturation manipulation.
27 */
28 uchar4 __attribute__((kernel)) saturation(uchar4 in)
29 {
30     float4 f4 = rsUnpackColor8888(in);
31     float3 result = dot(f4.rgb, gMonoMult);
32     result = mix( result, f4.rgb, saturationValue );
33 
34     return rsPackColorTo8888(result);
35 }
36 
37