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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.
*/
#include <math.h>
#include "filters.h"
void JNIFUNCF(ImageFilterBwFilter, nativeApplyFilter, jobject bitmap, jint width, jint height, jint rw, jint gw, jint bw)
{
char* destination = 0;
AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
unsigned char * rgb = (unsigned char * )destination;
float sr = rw;
float sg = gw;
float sb = bw;
float min = MIN(sg,sb);
min = MIN(sr,min);
float max = MAX(sg,sb);
max = MAX(sr,max);
float avg = (min+max)/2;
sb /= avg;
sg /= avg;
sr /= avg;
int i;
int len = width * height * 4;
for (i = 0; i < len; i+=4)
{
float r = sr *rgb[RED];
float g = sg *rgb[GREEN];
float b = sb *rgb[BLUE];
min = MIN(g,b);
min = MIN(r,min);
max = MAX(g,b);
max = MAX(r,max);
avg =(min+max)/2;
rgb[RED] = CLAMP(avg);
rgb[GREEN] = rgb[RED];
rgb[BLUE] = rgb[RED];
}
AndroidBitmap_unlockPixels(env, bitmap);
}
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