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
20static float brightM = 1.4142136f;
21static float brightC = -50.948268f;
22
23/*
24void setBright(float v) {
25    brightM = pow(2.f, v / 100.f);
26    brightC = 127.f - brightM * 127.f;
27}
28*/
29
30float4 RS_KERNEL contrast(float4 in) {
31    return in * brightM + brightC;
32}
33