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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.volley.toolbox;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import com.android.volley.NetworkResponse;
import com.android.volley.Response;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.shadows.ShadowBitmapFactory;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import static org.junit.Assert.*;
@RunWith(RobolectricTestRunner.class)
public class ImageRequestTest {
@Test public void parseNetworkResponse_resizing() throws Exception {
// This is a horrible hack but Robolectric doesn't have a way to provide
// width and height hints for decodeByteArray. It works because the byte array
// "file:fake" is ASCII encodable and thus the name in Robolectric's fake
// bitmap creator survives as-is, and provideWidthAndHeightHints puts
// "file:" + name in its lookaside map. I write all this because it will
// probably break mysteriously at some point and I feel terrible about your
// having to debug it.
byte[] jpegBytes = "file:fake".getBytes();
ShadowBitmapFactory.provideWidthAndHeightHints("fake", 1024, 500);
NetworkResponse jpeg = new NetworkResponse(jpegBytes);
// No resize
verifyResize(jpeg, 0, 0, 1024, 500);
// Exact sizes
verifyResize(jpeg, 512, 250, 512, 250); // exactly half
verifyResize(jpeg, 511, 249, 509, 249); // just under half
verifyResize(jpeg, 1080, 500, 1024, 500); // larger
verifyResize(jpeg, 500, 500, 500, 244); // keep same ratio
// Specify only width, preserve aspect ratio
verifyResize(jpeg, 512, 0, 512, 250);
verifyResize(jpeg, 800, 0, 800, 390);
verifyResize(jpeg, 1024, 0, 1024, 500);
// Specify only height, preserve aspect ratio
verifyResize(jpeg, 0, 250, 512, 250);
verifyResize(jpeg, 0, 391, 800, 391);
verifyResize(jpeg, 0, 500, 1024, 500);
}
private void verifyResize(NetworkResponse networkResponse, int maxWidth, int maxHeight,
int expectedWidth, int expectedHeight) {
ImageRequest request = new ImageRequest(
"", null, maxWidth, maxHeight, Config.RGB_565, null);
Response<Bitmap> response = request.parseNetworkResponse(networkResponse);
assertNotNull(response);
assertTrue(response.isSuccess());
Bitmap bitmap = response.result;
assertNotNull(bitmap);
assertEquals(expectedWidth, bitmap.getWidth());
assertEquals(expectedHeight, bitmap.getHeight());
}
@Test public void findBestSampleSize() {
// desired == actual == 1
assertEquals(1, ImageRequest.findBestSampleSize(100, 150, 100, 150));
// exactly half == 2
assertEquals(2, ImageRequest.findBestSampleSize(280, 160, 140, 80));
// just over half == 1
assertEquals(1, ImageRequest.findBestSampleSize(1000, 800, 501, 401));
// just under 1/4 == 4
assertEquals(4, ImageRequest.findBestSampleSize(100, 200, 24, 50));
}
private static byte[] readInputStream(InputStream in) throws IOException {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int count;
while ((count = in.read(buffer)) != -1) {
bytes.write(buffer, 0, count);
}
in.close();
return bytes.toByteArray();
}
}
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