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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.
*/
package com.android.gallery3d.filtershow.filters;
import android.graphics.Bitmap;
import android.text.format.Time;
import com.android.gallery3d.R;
public class ImageFilterKMeans extends ImageFilter {
private int mSeed = 0;
public ImageFilterKMeans() {
mName = "KMeans";
mMaxParameter = 20;
mMinParameter = 2;
mPreviewParameter = 4;
mDefaultParameter = 4;
mParameter = 4;
// set random seed for session
Time t = new Time();
t.setToNow();
mSeed = (int) t.toMillis(false);
}
native protected void nativeApplyFilter(Bitmap bitmap, int width, int height,
Bitmap large_ds_bm, int lwidth, int lheight, Bitmap small_ds_bm,
int swidth, int sheight, int p, int seed);
@Override
public int getButtonId() {
return R.id.kmeansButton;
}
@Override
public int getTextId() {
return R.string.kmeans;
}
@Override
public boolean isNil() {
return false;
}
@Override
public Bitmap apply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Bitmap large_bm_ds = bitmap;
Bitmap small_bm_ds = bitmap;
// find width/height for larger downsampled bitmap
int lw = w;
int lh = h;
while (lw > 256 && lh > 256) {
lw /= 2;
lh /= 2;
}
if (lw != w) {
large_bm_ds = Bitmap.createScaledBitmap(bitmap, lw, lh, true);
}
// find width/height for smaller downsampled bitmap
int sw = lw;
int sh = lh;
while (sw > 64 && sh > 64) {
sw /= 2;
sh /= 2;
}
if (sw != lw) {
small_bm_ds = Bitmap.createScaledBitmap(large_bm_ds, sw, sh, true);
}
int p = Math.max(mParameter, mMinParameter) % (mMaxParameter + 1);
nativeApplyFilter(bitmap, w, h, large_bm_ds, lw, lh, small_bm_ds, sw, sh, p, mSeed);
return bitmap;
}
}
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