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(ImageFilterExposure,nativeApplyFilter,jobject bitmap,jint width,jint height,jfloat bright)19 void JNIFUNCF(ImageFilterExposure, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat bright)
20 {
21 char* destination = 0;
22 AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
23 unsigned char * rgb = (unsigned char * )destination;
24 int i;
25 int len = width * height * 4;
26
27 int m = (255-bright);
28
29 for (i = 0; i < len; i+=4)
30 {
31 rgb[RED] = clamp((255*(rgb[RED]))/m);
32 rgb[GREEN] = clamp((255*(rgb[GREEN]))/m);
33 rgb[BLUE] = clamp((255*(rgb[BLUE]))/m);
34 }
35 AndroidBitmap_unlockPixels(env, bitmap);
36 }
37
38