129 lines
4.7 KiB
C++
129 lines
4.7 KiB
C++
/*
|
|
* 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;
|
|
}
|
|
}
|