ImageFilterDownsample.java revision afa8ed9d46e760d4b0c0331cfcb4bb49ef6ba280 
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 android.graphics.Bitmap;
20import android.graphics.Canvas;
21import android.graphics.Rect;
22
23import com.android.gallery3d.R;
24import com.android.gallery3d.filtershow.cache.ImageLoader;
25
26public class ImageFilterDownsample extends SimpleImageFilter {
27    private static final String SERIALIZATION_NAME = "DOWNSAMPLE";
28    private static final int ICON_DOWNSAMPLE_FRACTION = 8;
29    private ImageLoader mImageLoader;
30
31    public ImageFilterDownsample(ImageLoader loader) {
32        mName = "Downsample";
33        mImageLoader = loader;
34    }
35
36    public FilterRepresentation getDefaultRepresentation() {
37        FilterBasicRepresentation representation = (FilterBasicRepresentation) super.getDefaultRepresentation();
38        representation.setName("Downsample");
39        representation.setSerializationName(SERIALIZATION_NAME);
40
41        representation.setFilterClass(ImageFilterDownsample.class);
42        representation.setMaximum(100);
43        representation.setMinimum(1);
44        representation.setValue(50);
45        representation.setDefaultValue(50);
46        representation.setPreviewValue(3);
47        representation.setTextId(R.string.downsample);
48        representation.setButtonId(R.id.downsampleButton);
49        return representation;
50    }
51
52    @Override
53    public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
54        if (getParameters() == null) {
55            return bitmap;
56        }
57        int w = bitmap.getWidth();
58        int h = bitmap.getHeight();
59        int p = getParameters().getValue();
60
61        // size of original precached image
62        Rect size = mImageLoader.getOriginalBounds();
63        int orig_w = size.width();
64        int orig_h = size.height();
65
66        if (p > 0 && p < 100) {
67            // scale preview to same size as the resulting bitmap from a "save"
68            int newWidth = orig_w * p / 100;
69            int newHeight = orig_h * p / 100;
70
71            // only scale preview if preview isn't already scaled enough
72            if (newWidth <= 0 || newHeight <= 0 || newWidth >= w || newHeight >= h) {
73                return bitmap;
74            }
75            Bitmap ret = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
76            if (ret != bitmap) {
77                bitmap.recycle();
78            }
79            return ret;
80        }
81        return bitmap;
82    }
83}
84