ImageRequestTest.java revision e1f0d61968d5194088c18f00b1bcfc46a91adbfd 
1/*
2 * Copyright (C) 2011 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.volley.toolbox;
18
19import android.graphics.Bitmap;
20import android.graphics.Bitmap.Config;
21import android.widget.ImageView;
22import android.widget.ImageView.ScaleType;
23import com.android.volley.NetworkResponse;
24import com.android.volley.Response;
25import org.junit.Test;
26import org.junit.runner.RunWith;
27import org.robolectric.RobolectricTestRunner;
28import org.robolectric.shadows.ShadowBitmapFactory;
29
30import java.io.ByteArrayOutputStream;
31import java.io.IOException;
32import java.io.InputStream;
33
34import static org.junit.Assert.*;
35
36@RunWith(RobolectricTestRunner.class)
37public class ImageRequestTest {
38
39    @Test public void parseNetworkResponse_resizing() throws Exception {
40        // This is a horrible hack but Robolectric doesn't have a way to provide
41        // width and height hints for decodeByteArray. It works because the byte array
42        // "file:fake" is ASCII encodable and thus the name in Robolectric's fake
43        // bitmap creator survives as-is, and provideWidthAndHeightHints puts
44        // "file:" + name in its lookaside map. I write all this because it will
45        // probably break mysteriously at some point and I feel terrible about your
46        // having to debug it.
47        byte[] jpegBytes = "file:fake".getBytes();
48        ShadowBitmapFactory.provideWidthAndHeightHints("fake", 1024, 500);
49        NetworkResponse jpeg = new NetworkResponse(jpegBytes);
50
51        // Scale the image uniformly (maintain the image's aspect ratio) so that
52        // both dimensions (width and height) of the image will be equal to or
53        // less than the corresponding dimension of the view.
54        ScaleType scalteType = ScaleType.CENTER_INSIDE;
55
56        // Exact sizes
57        verifyResize(jpeg, 512, 250, scalteType, 512, 250); // exactly half
58        verifyResize(jpeg, 511, 249, scalteType, 509, 249); // just under half
59        verifyResize(jpeg, 1080, 500, scalteType, 1024, 500); // larger
60        verifyResize(jpeg, 500, 500, scalteType, 500, 244); // keep same ratio
61
62        // Specify only width, preserve aspect ratio
63        verifyResize(jpeg, 512, 0, scalteType, 512, 250);
64        verifyResize(jpeg, 800, 0, scalteType, 800, 390);
65        verifyResize(jpeg, 1024, 0, scalteType, 1024, 500);
66
67        // Specify only height, preserve aspect ratio
68        verifyResize(jpeg, 0, 250, scalteType, 512, 250);
69        verifyResize(jpeg, 0, 391, scalteType, 800, 391);
70        verifyResize(jpeg, 0, 500, scalteType, 1024, 500);
71
72        // No resize
73        verifyResize(jpeg, 0, 0, scalteType, 1024, 500);
74
75
76        // Scale the image uniformly (maintain the image's aspect ratio) so that
77        // both dimensions (width and height) of the image will be equal to or
78        // larger than the corresponding dimension of the view.
79        scalteType = ScaleType.CENTER_CROP;
80
81        // Exact sizes
82        verifyResize(jpeg, 512, 250, scalteType, 512, 250);
83        verifyResize(jpeg, 511, 249, scalteType, 511, 249);
84        verifyResize(jpeg, 1080, 500, scalteType, 1024, 500);
85        verifyResize(jpeg, 500, 500, scalteType, 1024, 500);
86
87        // Specify only width
88        verifyResize(jpeg, 512, 0, scalteType, 512, 250);
89        verifyResize(jpeg, 800, 0, scalteType, 800, 390);
90        verifyResize(jpeg, 1024, 0, scalteType, 1024, 500);
91
92        // Specify only height
93        verifyResize(jpeg, 0, 250, scalteType, 512, 250);
94        verifyResize(jpeg, 0, 391, scalteType, 800, 391);
95        verifyResize(jpeg, 0, 500, scalteType, 1024, 500);
96
97        // No resize
98        verifyResize(jpeg, 0, 0, scalteType, 1024, 500);
99
100
101        // Scale in X and Y independently, so that src matches dst exactly. This
102        // may change the aspect ratio of the src.
103        scalteType = ScaleType.FIT_XY;
104
105        // Exact sizes
106        verifyResize(jpeg, 512, 250, scalteType, 512, 250);
107        verifyResize(jpeg, 511, 249, scalteType, 511, 249);
108        verifyResize(jpeg, 1080, 500, scalteType, 1024, 500);
109        verifyResize(jpeg, 500, 500, scalteType, 500, 500);
110
111        // Specify only width
112        verifyResize(jpeg, 512, 0, scalteType, 512, 500);
113        verifyResize(jpeg, 800, 0, scalteType, 800, 500);
114        verifyResize(jpeg, 1024, 0, scalteType, 1024, 500);
115
116        // Specify only height
117        verifyResize(jpeg, 0, 250, scalteType, 1024, 250);
118        verifyResize(jpeg, 0, 391, scalteType, 1024, 391);
119        verifyResize(jpeg, 0, 500, scalteType, 1024, 500);
120
121        // No resize
122        verifyResize(jpeg, 0, 0, scalteType, 1024, 500);
123    }
124
125    private void verifyResize(NetworkResponse networkResponse, int maxWidth, int maxHeight,
126                              ScaleType scaleType, int expectedWidth, int expectedHeight) {
127        ImageRequest request = new ImageRequest("", null, maxWidth, maxHeight, scaleType,
128                Config.RGB_565, null);
129        Response<Bitmap> response = request.parseNetworkResponse(networkResponse);
130        assertNotNull(response);
131        assertTrue(response.isSuccess());
132        Bitmap bitmap = response.result;
133        assertNotNull(bitmap);
134        assertEquals(expectedWidth, bitmap.getWidth());
135        assertEquals(expectedHeight, bitmap.getHeight());
136    }
137
138    @Test public void findBestSampleSize() {
139        // desired == actual == 1
140        assertEquals(1, ImageRequest.findBestSampleSize(100, 150, 100, 150));
141
142        // exactly half == 2
143        assertEquals(2, ImageRequest.findBestSampleSize(280, 160, 140, 80));
144
145        // just over half == 1
146        assertEquals(1, ImageRequest.findBestSampleSize(1000, 800, 501, 401));
147
148        // just under 1/4 == 4
149        assertEquals(4, ImageRequest.findBestSampleSize(100, 200, 24, 50));
150    }
151
152    private static byte[] readInputStream(InputStream in) throws IOException {
153        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
154        byte[] buffer = new byte[1024];
155        int count;
156        while ((count = in.read(buffer)) != -1) {
157            bytes.write(buffer, 0, count);
158        }
159        in.close();
160        return bytes.toByteArray();
161    }
162
163    @Test
164    public void publicMethods() throws Exception {
165        // Catch-all test to find API-breaking changes.
166        assertNotNull(ImageRequest.class.getConstructor(String.class, Response.Listener.class,
167                int.class, int.class, Bitmap.Config.class, Response.ErrorListener.class));
168        assertNotNull(ImageRequest.class.getConstructor(String.class, Response.Listener.class,
169                int.class, int.class, ImageView.ScaleType.class, Bitmap.Config.class,
170                Response.ErrorListener.class));
171    }
172}
173