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
JNIFUNCF(ImageFilterSaturated,nativeApplyFilter,jobject bitmap,jint width,jint height,jfloat saturation)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