ImageFilterDownsample.java revision 71f04cbaedbb89e313e0b86b531640db2d3f6016 
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 int ICON_DOWNSAMPLE_FRACTION = 8;
28    private ImageLoader mImageLoader;
29
30    public ImageFilterDownsample(ImageLoader loader) {
31        mName = "Downsample";
32        mImageLoader = loader;
33    }
34
35    public FilterRepresentation getDefaultRepresentation() {
36        FilterBasicRepresentation representation = (FilterBasicRepresentation) super.getDefaultRepresentation();
37        representation.setName("Downsample");
38        representation.setFilterClass(ImageFilterDownsample.class);
39        representation.setMaximum(100);
40        representation.setMinimum(1);
41        representation.setValue(50);
42        representation.setDefaultValue(50);
43        representation.setPreviewValue(3);
44        return representation;
45    }
46
47    @Override
48    public int getButtonId() {
49        return R.id.downsampleButton;
50    }
51
52    @Override
53    public int getTextId() {
54        return R.string.downsample;
55    }
56
57    @Override
58    public Bitmap apply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
59        if (getParameters() == null) {
60            return bitmap;
61        }
62        int w = bitmap.getWidth();
63        int h = bitmap.getHeight();
64        int p = getParameters().getValue();
65
66        // size of original precached image
67        Rect size = mImageLoader.getOriginalBounds();
68        int orig_w = size.width();
69        int orig_h = size.height();
70
71        if (p > 0 && p < 100) {
72            // scale preview to same size as the resulting bitmap from a "save"
73            int newWidth = orig_w * p / 100;
74            int newHeight = orig_h * p / 100;
75
76            // only scale preview if preview isn't already scaled enough
77            if (newWidth <= 0 || newHeight <= 0 || newWidth >= w || newHeight >= h) {
78                return bitmap;
79            }
80            Bitmap ret = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
81            if (ret != bitmap) {
82                bitmap.recycle();
83            }
84            return ret;
85        }
86        return bitmap;
87    }
88
89    @Override
90    public Bitmap iconApply(Bitmap bitmap, float scaleFactor, boolean highQuality) {
91        int w = bitmap.getWidth();
92        int h = bitmap.getHeight();
93        Bitmap ret = Bitmap.createScaledBitmap(bitmap, w / ICON_DOWNSAMPLE_FRACTION, h
94                / ICON_DOWNSAMPLE_FRACTION, false);
95        Rect dst = new Rect(0, 0, w, h);
96        Rect src = new Rect(0, 0, w / ICON_DOWNSAMPLE_FRACTION, h / ICON_DOWNSAMPLE_FRACTION);
97        Canvas c = new Canvas(bitmap);
98        c.drawBitmap(ret, src, dst, null);
99        return bitmap;
100    }
101}
102