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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"
static int* gVignetteMap = 0;
static int gVignetteWidth = 0;
static int gVignetteHeight = 0;
__inline__ void createVignetteMap(int w, int h)
{
if (gVignetteMap && (gVignetteWidth != w || gVignetteHeight != h))
{
free(gVignetteMap);
gVignetteMap = 0;
}
if (gVignetteMap == 0)
{
gVignetteWidth = w;
gVignetteHeight = h;
int cx = w / 2;
int cy = h / 2;
int i, j;
gVignetteMap = malloc(w * h * sizeof(int));
float maxDistance = cx * cx * 2.0f;
for (i = 0; i < w; i++)
{
for (j = 0; j < h; j++)
{
float distance = (cx - i) * (cx - i) + (cy - j) * (cy - j);
gVignetteMap[j * w + i] = (int) (distance / maxDistance * 255);
}
}
}
}
void JNIFUNCF(ImageFilterVignette, nativeApplyFilter, jobject bitmap, jint width, jint height, jfloat strength)
{
char* destination = 0;
AndroidBitmap_lockPixels(env, bitmap, (void**) &destination);
createVignetteMap(width, height);
int i;
int len = width * height * 4;
int vignette = 0;
for (i = 0; i < len; i += 4)
{
vignette = (int) (strength * gVignetteMap[i / 4]);
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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