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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 "filters.h"
#include <math.h>
static int* gVignetteMap = 0;
static int gVignetteWidth = 0;
static int gVignetteHeight = 0;
void JNIFUNCF(ImageFilterVignette, nativeApplyFilter, jobject bitmap, jint width, jint height, jint centerx, jint centery, jfloat radiusx, jfloat radiusy, jfloat strength)
{
char* destination = 0;
AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
int i;
int len = width * height * 4;
int vignette = 0;
float d = centerx;
if (radiusx == 0) radiusx = 10;
if (radiusy == 0) radiusy = 10;
float scalex = 1/radiusx;
float scaley = 1/radiusy;
for (i = 0; i < len; i += 4)
{
int p = i/4;
float x = ((p%width)-centerx)*scalex;
float y = ((p/width)-centery)*scaley;
float dist = sqrt(x*x+y*y)-1;
vignette = (int) (strength*256*MAX(dist,0));
destination[RED] = CLAMP(destination[RED] - vignette);
destination[GREEN] = CLAMP(destination[GREEN] - vignette);
destination[BLUE] = CLAMP(destination[BLUE] - vignette);
}
AndroidBitmap_unlockPixels(env, bitmap);
}
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