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
19void 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