1227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks/* 2227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * Copyright (C) 2013 The Android Open Source Project 3227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * 4227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * Licensed under the Apache License, Version 2.0 (the "License"); 5227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * you may not use this file except in compliance with the License. 6227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * You may obtain a copy of the License at 7227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * 8227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * http://www.apache.org/licenses/LICENSE-2.0 9227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * 10227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * Unless required by applicable law or agreed to in writing, software 11227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * distributed under the License is distributed on an "AS IS" BASIS 12227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * See the License for the specific language governing permissions and 14227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks * limitations under the License. 15227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks */ 16227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 17227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks// Native function to extract brightness from image (handed down as ByteBuffer). 18227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 19227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks#include "brightness.h" 20227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 21227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks#include <math.h> 22227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks#include <string.h> 23227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks#include <jni.h> 24227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks#include <unistd.h> 25227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks#include <android/log.h> 26227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 27227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricksjfloat 28227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin HendricksJava_androidx_media_filterfw_samples_simplecamera_AvgBrightnessFilter_brightnessOperator( 29227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks JNIEnv* env, jclass clazz, jint width, jint height, jobject imageBuffer) { 30227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 31227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks if (imageBuffer == 0) { 32227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks return 0.0f; 33227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks } 34227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks float pixelTotals[] = { 0.0f, 0.0f, 0.0f }; 35227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks const int numPixels = width * height; 36227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks unsigned char* srcPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer)); 37227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks for (int i = 0; i < numPixels; i++) { 38227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks pixelTotals[0] += *(srcPtr + 4 * i); 39227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks pixelTotals[1] += *(srcPtr + 4 * i + 1); 40227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks pixelTotals[2] += *(srcPtr + 4 * i + 2); 41227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks } 42227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks float avgPixels[] = { 0.0f, 0.0f, 0.0f }; 43227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 44227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks avgPixels[0] = pixelTotals[0] / numPixels; 45227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks avgPixels[1] = pixelTotals[1] / numPixels; 46227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks avgPixels[2] = pixelTotals[2] / numPixels; 47227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks float returnValue = sqrt(0.241f * avgPixels[0] * avgPixels[0] + 48227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 0.691f * avgPixels[1] * avgPixels[1] + 49227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 0.068f * avgPixels[2] * avgPixels[2]); 50227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks 51227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks return returnValue / 255; 52227b47625d7482b5b47ad0e4c70ce0a246236adeBenjamin Hendricks} 53