1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <math.h> 18 #include "filters.h" 19 20 void JNIFUNCF(ImageFilterVibrance, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat vibrance) 21 { 22 char* destination = 0; 23 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); 24 int i; 25 int len = width * height * 4; 26 float Rf = 0.2999f; 27 float Gf = 0.587f; 28 float Bf = 0.114f; 29 float Vib = vibrance/100.f; 30 float S = Vib+1; 31 float MS = 1.0f - S; 32 float Rt = Rf * MS; 33 float Gt = Gf * MS; 34 float Bt = Bf * MS; 35 float R, G, B; 36 for (i = 0; i < len; i+=4) 37 { 38 int r = destination[RED]; 39 int g = destination[GREEN]; 40 int b = destination[BLUE]; 41 float red = (r-MAX(g, b))/256.f; 42 float sx = (float)(Vib/(1+exp(-red*3))); 43 S = sx+1; 44 MS = 1.0f - S; 45 Rt = Rf * MS; 46 Gt = Gf * MS; 47 Bt = Bf * MS; 48 int t = (r + g) / 2; 49 R = r; 50 G = g; 51 B = b; 52 53 float Rc = R * (Rt + S) + G * Gt + B * Bt; 54 float Gc = R * Rt + G * (Gt + S) + B * Bt; 55 float Bc = R * Rt + G * Gt + B * (Bt + S); 56 57 destination[RED] = CLAMP(Rc); 58 destination[GREEN] = CLAMP(Gc); 59 destination[BLUE] = CLAMP(Bc); 60 } 61 AndroidBitmap_unlockPixels(env, bitmap); 62 } 63
