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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"
float vibrance = 0.f;
static const float Rf = 0.2999f;
static const float Gf = 0.587f;
static const float Bf = 0.114f;
static float S = 0.f;
static float MS = 0.f;
static float Rt = 0.f;
static float Gt = 0.f;
static float Bt = 0.f;
static float Vib = 0.f;
void vibranceKernel(const uchar4 *in, uchar4 *out) {
float R, G, B;
int r = in->r;
int g = in->g;
int b = in->b;
float red = (r-max(g, b))/256.f;
float sx = (float)(Vib/(1+exp(-red*3)));
S = sx+1;
MS = 1.0f - S;
Rt = Rf * MS;
Gt = Gf * MS;
Bt = Bf * MS;
int t = (r + g) / 2;
R = r;
G = g;
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);
out->r = rsClamp(Rc, 0, 255);
out->g = rsClamp(Gc, 0, 255);
out->b = rsClamp(Bc, 0, 255);
}
void prepareVibrance() {
Vib = vibrance/100.f;
S = Vib + 1;
MS = 1.0f - S;
Rt = Rf * MS;
Gt = Gf * MS;
Bt = Bf * MS;
}
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