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/*
* Copyright (C) 2012 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 histogram from image (handed down as ByteBuffer).
#include "histogram.h"
#include <string.h>
#include <jni.h>
#include <unistd.h>
#include <android/log.h>
#include "imgprocutil.h"
inline void addPixelToHistogram(unsigned char*& pImg, int* pHist, int numBins) {
int R = *(pImg++);
int G = *(pImg++);
int B = *(pImg++);
++pImg;
int i = getIntensityFast(R, G, B);
int bin = clamp(0, static_cast<int>(static_cast<float>(i * numBins) / 255.0f), numBins - 1);
++pHist[bin];
}
void Java_androidx_media_filterpacks_histogram_GrayHistogramFilter_extractHistogram(
JNIEnv* env, jclass clazz, jobject imageBuffer, jobject maskBuffer, jobject histogramBuffer )
{
unsigned char* pImg = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer));
int* pHist = static_cast<int*>(env->GetDirectBufferAddress(histogramBuffer));
int numPixels = env->GetDirectBufferCapacity(imageBuffer) / 4; // 4 bytes per pixel
int numBins = env->GetDirectBufferCapacity(histogramBuffer);
unsigned char* pMask = NULL;
if(maskBuffer != NULL) {
pMask = static_cast<unsigned char*>(env->GetDirectBufferAddress(maskBuffer));
}
for(int i = 0; i < numBins; ++i) pHist[i] = 0;
if(pMask == NULL) {
for( ; numPixels > 0; --numPixels) {
addPixelToHistogram(pImg, pHist, numBins);
}
} else {
for( ; numPixels > 0; --numPixels) {
if(*pMask == 0){
pMask += 4;
pImg += 4; // Note that otherwise addPixelToHistogram advances pImg by 4
continue;
}
pMask += 4;
addPixelToHistogram(pImg, pHist, numBins);
}
}
}
void Java_androidx_media_filterpacks_histogram_ChromaHistogramFilter_extractChromaHistogram(
JNIEnv* env, jclass clazz, jobject imageBuffer, jobject histogramBuffer, jint hBins, jint sBins)
{
unsigned char* pixelIn = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer));
float* histOut = static_cast<float*>(env->GetDirectBufferAddress(histogramBuffer));
int numPixels = env->GetDirectBufferCapacity(imageBuffer) / 4; // 4 bytes per pixel
for (int i = 0; i < hBins * sBins; ++i) histOut[i] = 0.0f;
int h, s, v;
float hScaler = hBins / 256.0f;
float sScaler = sBins / 256.0f;
for( ; numPixels > 0; --numPixels) {
h = *(pixelIn++);
s = *(pixelIn++);
v = *(pixelIn++);
pixelIn++;
int index = static_cast<int>(s * sScaler) * hBins + static_cast<int>(h * hScaler);
histOut[index] += 1.0f;
}
}
void Java_androidx_media_filterpacks_histogram_NewChromaHistogramFilter_extractChromaHistogram(
JNIEnv* env, jclass clazz, jobject imageBuffer, jobject histogramBuffer,
jint hueBins, jint saturationBins, jint valueBins,
jint saturationThreshold, jint valueThreshold) {
unsigned char* pixelIn = static_cast<unsigned char*>(env->GetDirectBufferAddress(imageBuffer));
float* histOut = static_cast<float*>(env->GetDirectBufferAddress(histogramBuffer));
int numPixels = env->GetDirectBufferCapacity(imageBuffer) / 4; // 4 bytes per pixel
// TODO: add check on the size of histOut
for (int i = 0; i < (hueBins * saturationBins + valueBins); ++i) {
histOut[i] = 0.0f;
}
for( ; numPixels > 0; --numPixels) {
int h = *(pixelIn++);
int s = *(pixelIn++);
int v = *(pixelIn++);
pixelIn++;
// If a pixel that is either too dark (less than valueThreshold) or colorless
// (less than saturationThreshold), if will be put in a 1-D value histogram instead.
int index;
if (s > saturationThreshold && v > valueThreshold) {
int sIndex = s * saturationBins / 256;
// Shifting hue index by 0.5 such that peaks of red, yellow, green, cyan, blue, pink
// will be at the center of some bins.
int hIndex = ((h * hueBins + 128) / 256) % hueBins;
index = sIndex * hueBins + hIndex;
} else {
index = hueBins * saturationBins + (v * valueBins / 256);
}
histOut[index] += 1.0f;
}
}
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