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      1 /*
      2  * Copyright (C) 2012 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 #include "ip.rsh"
     18 #pragma rs_fp_relaxed
     19 
     20 const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
     21 
     22 uchar4 RS_KERNEL root(uchar4 v_in) {
     23     float4 f4 = rsUnpackColor8888(v_in);
     24 
     25     float3 mono = dot(f4.rgb, gMonoMult);
     26     return rsPackColorTo8888(mono);
     27 }
     28 
     29 uchar RS_KERNEL toU8(uchar4 v_in) {
     30     float4 f4 = convert_float4(v_in);
     31     return (uchar)dot(f4.rgb, gMonoMult);
     32 }
     33 
     34 uchar4 RS_KERNEL toU8_4(uchar v_in) {
     35     return (uchar4)v_in;
     36 }
     37 
     38