| /* |
| * 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; |
| } |