ImageFilterBwFilter.java revision 6900cad45d240c9a54b92991538b6a33652e766c 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.gallery3d.filtershow.filters;
18
19import com.android.gallery3d.R;
20
21import android.graphics.Bitmap;
22import android.graphics.Color;
23
24
25public class ImageFilterBwFilter extends SimpleImageFilter {
26
27    public ImageFilterBwFilter() {
28        mName = "BW Filter";
29    }
30
31    public FilterRepresentation getDefaultRepresentation() {
32        FilterBasicRepresentation representation = (FilterBasicRepresentation) super.getDefaultRepresentation();
33        representation.setName("BW Filter");
34        representation.setFilterClass(ImageFilterBwFilter.class);
35        representation.setMaximum(180);
36        representation.setMinimum(-180);
37        representation.setTextId(R.string.bwfilter);
38        representation.setButtonId(R.id.bwfilterButton);
39        return representation;
40    }
41
42    native protected void nativeApplyFilter(Bitmap bitmap, int w, int h, int r, int g, int b);
43
44    @Override
45    public Bitmap apply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
46        if (getParameters() == null) {
47            return bitmap;
48        }
49        int w = bitmap.getWidth();
50        int h = bitmap.getHeight();
51        float[] hsv = new float[] {
52                180 + getParameters().getValue(), 1, 1
53        };
54        int rgb = Color.HSVToColor(hsv);
55        int r = 0xFF & (rgb >> 16);
56        int g = 0xFF & (rgb >> 8);
57        int b = 0xFF & (rgb >> 0);
58        nativeApplyFilter(bitmap, w, h, r, g, b);
59        return bitmap;
60    }
61}
62