1 /*
2  * Copyright (C) 2013 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.rs.hellocomputendk)
19 
20 const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
21 
22 void root(const uchar4 *v_in, uchar4 *v_out) {
23     float4 f4 = rsUnpackColor8888(*v_in);
24 
25     float3 mono = dot(f4.rgb, gMonoMult);
26     *v_out = rsPackColorTo8888(mono);
27 }
28 
29