| /* |
| * 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 <math.h> |
| #include "filters.h" |
| |
| void JNIFUNCF(ImageFilterVibrance, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat vibrance) |
| { |
| char* destination = 0; |
| AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); |
| int i; |
| int len = width * height * 4; |
| float Rf = 0.2999f; |
| float Gf = 0.587f; |
| float Bf = 0.114f; |
| float Vib = vibrance/100.f; |
| float S = Vib+1; |
| float MS = 1.0f - S; |
| float Rt = Rf * MS; |
| float Gt = Gf * MS; |
| float Bt = Bf * MS; |
| float R, G, B; |
| for (i = 0; i < len; i+=4) |
| { |
| int r = destination[RED]; |
| int g = destination[GREEN]; |
| int b = destination[BLUE]; |
| 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); |
| |
| destination[RED] = CLAMP(Rc); |
| destination[GREEN] = CLAMP(Gc); |
| destination[BLUE] = CLAMP(Bc); |
| } |
| AndroidBitmap_unlockPixels(env, bitmap); |
| } |