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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.imaging.roundtrip;
19  
20  import static org.junit.jupiter.api.Assertions.assertTrue;
21  
22  import java.awt.image.BufferedImage;
23  import java.io.ByteArrayOutputStream;
24  import java.util.stream.Stream;
25  
26  import org.apache.commons.imaging.ImageInfo;
27  import org.apache.commons.imaging.Imaging;
28  import org.apache.commons.imaging.PixelDensity;
29  import org.apache.commons.imaging.formats.tiff.TiffImageParser;
30  import org.apache.commons.imaging.formats.tiff.TiffImagingParameters;
31  import org.junit.jupiter.params.ParameterizedTest;
32  import org.junit.jupiter.params.provider.MethodSource;
33  
34  public class PixelDensityRoundtrip extends RoundtripBase {
35  
36      public static Stream<FormatInfo> testPixelDensityRoundtrip() {
37          return Stream.of(FormatInfo.PRESERVING_RESOLUTION_FORMATS);
38      }
39  
40      @ParameterizedTest
41      @MethodSource
42      public void testPixelDensityRoundtrip(final FormatInfo formatInfo) throws Exception {
43          final BufferedImage testImage = TestImages.createFullColorImage(2, 2);
44  
45          final TiffImagingParameters params = new TiffImagingParameters();
46          final PixelDensity pixelDensity = PixelDensity.createFromPixelsPerInch(75, 150);
47          params.setPixelDensity(pixelDensity);
48          final TiffImageParser tiffImageParser = new TiffImageParser();
49          final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
50          tiffImageParser.writeImage(testImage, byteArrayOutputStream, params);
51  
52          final ImageInfo imageInfo = Imaging.getImageInfo(byteArrayOutputStream.toByteArray());
53          if (imageInfo != null) {
54              final int xReadDPI = imageInfo.getPhysicalWidthDpi();
55              final int yReadDPI = imageInfo.getPhysicalHeightDpi();
56              // allow a 5% margin of error in storage and conversion
57              assertTrue(Math.abs((xReadDPI - pixelDensity.horizontalDensityInches()) / pixelDensity.horizontalDensityInches()) <= 0.05);
58              assertTrue(Math.abs((yReadDPI - pixelDensity.verticalDensityInches()) / pixelDensity.verticalDensityInches()) <= 0.05);
59          }
60      }
61  
62  }