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.content.res.Resources;
20import android.graphics.Bitmap;
21import android.graphics.Bitmap.Config;
22import android.test.InstrumentationTestCase;
23import android.test.suitebuilder.annotation.SmallTest;
24
25import com.android.volley.NetworkResponse;
26import com.android.volley.Response;
27import com.android.volley.tests.R;
28
29import java.io.ByteArrayOutputStream;
30import java.io.IOException;
31import java.io.InputStream;
32
33@SmallTest
34public class ImageRequestTest extends InstrumentationTestCase {
35
36    public void testParseNetworkResponse_resizing() throws Exception {
37        byte[] jpegBytes = readRawResource(
38                getInstrumentation().getContext().getResources(), R.raw.large_jpeg_1024_500);
39        NetworkResponse jpeg = new NetworkResponse(jpegBytes);
40
41        // Exact sizes
42        verifyResize(jpeg, 512, 250, 512, 250); // exactly half
43        verifyResize(jpeg, 511, 249, 509, 249); // just under half
44        verifyResize(jpeg, 1080, 500, 1024, 500); // larger
45        verifyResize(jpeg, 500, 500, 500, 244); // keep same ratio
46
47        // Specify only width, preserve aspect ratio
48        verifyResize(jpeg, 512, 0, 512, 250);
49        verifyResize(jpeg, 800, 0, 800, 390);
50        verifyResize(jpeg, 1024, 0, 1024, 500);
51
52        // Specify only height, preserve aspect ratio
53        verifyResize(jpeg, 0, 250, 512, 250);
54        verifyResize(jpeg, 0, 391, 800, 391);
55        verifyResize(jpeg, 0, 500, 1024, 500);
56
57        // No resize
58        verifyResize(jpeg, 0, 0, 1024, 500);
59    }
60
61    private void verifyResize(NetworkResponse networkResponse, int maxWidth, int maxHeight,
62            int expectedWidth, int expectedHeight) {
63        ImageRequest request = new ImageRequest(
64                "", null, maxWidth, maxHeight, Config.RGB_565, null);
65        Response<Bitmap> response = request.parseNetworkResponse(networkResponse);
66        assertNotNull(response);
67        assertTrue(response.isSuccess());
68        Bitmap bitmap = response.result;
69        assertNotNull(bitmap);
70        assertEquals(expectedWidth, bitmap.getWidth());
71        assertEquals(expectedHeight, bitmap.getHeight());
72    }
73
74    public void testFindBestSampleSize() {
75        // desired == actual == 1
76        assertEquals(1, ImageRequest.findBestSampleSize(100, 150, 100, 150));
77
78        // exactly half == 2
79        assertEquals(2, ImageRequest.findBestSampleSize(280, 160, 140, 80));
80
81        // just over half == 1
82        assertEquals(1, ImageRequest.findBestSampleSize(1000, 800, 501, 401));
83
84        // just under 1/4 == 4
85        assertEquals(4, ImageRequest.findBestSampleSize(100, 200, 24, 50));
86    }
87
88    private static byte[] readRawResource(Resources res, int resId) throws IOException {
89        InputStream in = res.openRawResource(resId);
90        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
91        byte[] buffer = new byte[1024];
92        int count;
93        while ((count = in.read(buffer)) != -1) {
94            bytes.write(buffer, 0, count);
95        }
96        in.close();
97        return bytes.toByteArray();
98    }
99
100}
101