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 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