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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ip.rsh"
// #pragma rs_fp_relaxed
static float brightM = 1.4142136f;
static float brightC = -50.948268f;
/*
void setBright(float v) {
brightM = pow(2.f, v / 100.f);
brightC = 127.f - brightM * 127.f;
}
*/
float4 RS_KERNEL contrast(float4 in) {
return in * brightM + brightC;
}
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