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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Native function to extract exposure from image (handed down as ByteBuffer).
#include "exposure.h"
#include <math.h>
#include <string.h>
#include <jni.h>
#include <unistd.h>
#include <android/log.h>
jfloat
Java_androidx_media_filterfw_samples_simplecamera_ExposureFilter_overExposureOperator(
JNIEnv* env, jclass clazz, jint width, jint height, jobject imageBuffer) {
if (imageBuffer == 0) {
return 0.0f;
}
const int numPixels = width * height;
unsigned char* srcPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer));
int output = 0;
float tempLuminance = 0.0f;
for (int i = 0; i < numPixels; i++) {
tempLuminance = (0.2126f * *(srcPtr + 4 * i) +
0.7152f * *(srcPtr + 4 * i + 1) +
0.0722f * *(srcPtr + 4 * i + 2));
if (tempLuminance + 5 >= 255) {
output++;
}
}
return (static_cast<float>(output)) / numPixels;
}
jfloat
Java_androidx_media_filterfw_samples_simplecamera_ExposureFilter_underExposureOperator(
JNIEnv* env, jclass clazz, jint width, jint height, jobject imageBuffer) {
if (imageBuffer == 0) {
return 0.0f;
}
const int numPixels = width * height;
unsigned char* srcPtr = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer));
int output = 0;
float tempLuminance = 0.0f;
for (int i = 0; i < numPixels; i++) {
tempLuminance = (0.2126f * *(srcPtr + 4 * i) +
0.7152f * *(srcPtr + 4 * i + 1) +
0.0722f * *(srcPtr + 4 * i + 2));
if (tempLuminance - 5 <= 0) {
output++;
}
}
return (static_cast<float>(output)) / numPixels;
}
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