ImageFilterDownsample.java revision ff6b23e655883f8f42bcf5c806f594512beaa322 
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.Rect;
21
22import com.android.gallery3d.R;
23import com.android.gallery3d.filtershow.cache.ImageLoader;
24
25public class ImageFilterDownsample extends ImageFilter {
26    private ImageLoader mImageLoader;
27
28    public ImageFilterDownsample(ImageLoader loader) {
29        mName = "Downsample";
30        mMaxParameter = 100;
31        mMinParameter = 1;
32        mPreviewParameter = 3;
33        mDefaultParameter = 50;
34        mParameter = 50;
35        mImageLoader = loader;
36    }
37
38    @Override
39    public int getButtonId() {
40        return R.id.downsampleButton;
41    }
42
43    @Override
44    public int getTextId() {
45        return R.string.downsample;
46    }
47
48    @Override
49    public boolean isNil() {
50        return false;
51    }
52
53    @Override
54    public Bitmap apply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
55        int w = bitmap.getWidth();
56        int h = bitmap.getHeight();
57        int p = mParameter;
58
59        // size of original precached image
60        Rect size = mImageLoader.getOriginalBounds();
61        int orig_w = size.width();
62        int orig_h = size.height();
63
64        if (p > 0 && p < 100) {
65            // scale preview to same size as the resulting bitmap from a "save"
66            int newWidth =  orig_w * p / 100;
67            int newHeight = orig_h * p / 100;
68
69            // only scale preview if preview isn't already scaled enough
70            if (newWidth <= 0 || newHeight <= 0 || newWidth >= w || newHeight >= h) {
71                return bitmap;
72            }
73            Bitmap ret = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
74            if (ret != bitmap) {
75                bitmap.recycle();
76            }
77            return ret;
78        }
79        return bitmap;
80    }
81}
82