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(ImageFilterNegative,nativeApplyFilter,jobject bitmap,jint width,jint height)19 void JNIFUNCF(ImageFilterNegative, nativeApplyFilter, jobject bitmap, jint width, jint height)
20 {
21 char* destination = 0;
22 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
23
24 int tot_len = height * width * 4;
25 int i;
26 char * dst = destination;
27 for (i = 0; i < tot_len; i+=4) {
28 dst[RED] = 255 - dst[RED];
29 dst[GREEN] = 255 - dst[GREEN];
30 dst[BLUE] = 255 - dst[BLUE];
31 }
32 AndroidBitmap_unlockPixels(env, bitmap);
33 }
34