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(ImageFilterBwFilter, nativeApplyFilter, jobject bitmap, jint width, jint height, jint rw, jint gw, jint bw)
22 char* destination = 0;
23 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
24 unsigned char * rgb = (unsigned char * )destination;
29 float min = MIN(sg,sb);
31 float max = MAX(sg,sb);
33 float avg = (min+max)/2;
38 int len = width * height * 4;
40 for (i = 0; i < len; i+=4)
42 float r = sr *rgb[RED];
43 float g = sg *rgb[GREEN];
44 float b = sb *rgb[BLUE];
50 rgb[RED] = CLAMP(avg);
51 rgb[GREEN] = rgb[RED];
54 AndroidBitmap_unlockPixels(env, bitmap);