2 * Copyright (C) 2012 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
20 void JNIFUNCF(ImageFilterVibrance, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat vibrance)
22 char* destination = 0;
23 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
25 int len = width * height * 4;
29 float Vib = vibrance/100.f;
36 for (i = 0; i < len; i+=4)
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)));
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);
57 destination[RED] = CLAMP(Rc);
58 destination[GREEN] = CLAMP(Gc);
59 destination[BLUE] = CLAMP(Bc);
61 AndroidBitmap_unlockPixels(env, bitmap);