1572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams/*
2572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * Copyright (C) 2012 The Android Open Source Project
3572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams *
4572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * Licensed under the Apache License, Version 2.0 (the "License");
5572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * you may not use this file except in compliance with the License.
6572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * You may obtain a copy of the License at
7572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams *
8572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams *      http://www.apache.org/licenses/LICENSE-2.0
9572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams *
10572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * Unless required by applicable law or agreed to in writing, software
11572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * distributed under the License is distributed on an "AS IS" BASIS,
12572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * See the License for the specific language governing permissions and
14572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams * limitations under the License.
15572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams */
16572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams
17572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams#include "ip.rsh"
186939f7bf32ab2765dcedb8a8d6fd352e7d08540fJason Sams#pragma rs_fp_relaxed
19572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams
20572a5031a5d8602db0bec0b253428a034bd4dd59Jason Samsstatic float brightM = 0.f;
21572a5031a5d8602db0bec0b253428a034bd4dd59Jason Samsstatic float brightC = 0.f;
22572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams
23572a5031a5d8602db0bec0b253428a034bd4dd59Jason Samsvoid setBright(float v) {
24572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams    brightM = pow(2.f, v / 100.f);
25572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams    brightC = 127.f - brightM * 127.f;
26572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams}
27572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams
28025b5f82971c431eb22df3c9d0f00b3cbe426bdbChris Wailesuchar4 RS_KERNEL contrast(uchar4 in) {
2923e1074f29f431f68c6b3230c1315ea0f7c7bc86Jason Sams    float3 v = convert_float3(in.rgb) * brightM + brightC;
3023e1074f29f431f68c6b3230c1315ea0f7c7bc86Jason Sams    uchar4 o;
3123e1074f29f431f68c6b3230c1315ea0f7c7bc86Jason Sams    o.rgb = convert_uchar3(clamp(v, 0.f, 255.f));
3223e1074f29f431f68c6b3230c1315ea0f7c7bc86Jason Sams    o.a = 0xff;
3323e1074f29f431f68c6b3230c1315ea0f7c7bc86Jason Sams    return o;
34572a5031a5d8602db0bec0b253428a034bd4dd59Jason Sams}
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