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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
float vibrance = 0.f;
static const float Rf = 0.2999f;
static const float Gf = 0.587f;
static const float Bf = 0.114f;
static float Vib = 0.f;
uchar4 RS_KERNEL vibranceKernel(uchar4 in) {
int r = in.r;
int g = in.g;
int b = in.b;
float red = (r-max(g, b)) * (1.f / 256.f);
float S = (float)(Vib/(1+native_exp(-red*3)))+1;
float MS = 1.0f - S;
float Rt = Rf * MS;
float Gt = Gf * MS;
float Bt = Bf * MS;
float R = r;
float G = g;
float B = b;
float Rc = R * (Rt + S) + G * Gt + B * Bt;
float Gc = R * Rt + G * (Gt + S) + B * Bt;
float Bc = R * Rt + G * Gt + B * (Bt + S);
uchar4 o;
o.r = clamp((int) Rc, 0, 255);
o.g = clamp((int) Gc, 0, 255);
o.b = clamp((int) Bc, 0, 255);
o.a = 0xff;
return o;
}
void prepareVibrance() {
Vib = vibrance/100.f;
}
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