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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(ImageFilterContrast, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat bright)
{
(void)obj;
char* destination = 0;
AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
unsigned char * rgb = (unsigned char * )destination;
int i;
int len = width * height * 4;
float m = (float)pow(2, bright/100.);
float c = 127-m*127;
for (i = 0; i < len; i+=4) {
rgb[RED] = clamp((int)(m*rgb[RED]+c));
rgb[GREEN] = clamp((int)(m*rgb[GREEN]+c));
rgb[BLUE] = clamp((int)(m*rgb[BLUE]+c));
}
AndroidBitmap_unlockPixels(env, bitmap);
}
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