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 "filters.h" 18 19 void JNIFUNCF(ImageFilterSaturated, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat saturation) 20 { 21 char* destination = 0; 22 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination); 23 int i; 24 int len = width * height * 4; 25 float Rf = 0.2999f; 26 float Gf = 0.587f; 27 float Bf = 0.114f; 28 float S = saturation;; 29 float MS = 1.0f - S; 30 float Rt = Rf * MS; 31 float Gt = Gf * MS; 32 float Bt = Bf * MS; 33 float R, G, B; 34 for (i = 0; i < len; i+=4) 35 { 36 int r = destination[RED]; 37 int g = destination[GREEN]; 38 int b = destination[BLUE]; 39 int t = (r + g) / 2; 40 R = r; 41 G = g; 42 B = b; 43 44 float Rc = R * (Rt + S) + G * Gt + B * Bt; 45 float Gc = R * Rt + G * (Gt + S) + B * Bt; 46 float Bc = R * Rt + G * Gt + B * (Bt + S); 47 48 destination[RED] = CLAMP(Rc); 49 destination[GREEN] = CLAMP(Gc); 50 destination[BLUE] = CLAMP(Bc); 51 } 52 AndroidBitmap_unlockPixels(env, bitmap); 53 } 54
