ImageSharp/tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.cs

// <copyright file="JpegEncoderTests.cs" company="James Jackson-South">
// Copyright (c) James Jackson-South and contributors.
// Licensed under the Apache License, Version 2.0.
// </copyright>

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using ImageSharp.Formats;
using Xunit;
using Xunit.Abstractions;
// ReSharper disable InconsistentNaming

namespace ImageSharp.Tests
{
    using ImageSharp.Formats.Jpg;
    using ImageSharp.Processing;

    public class JpegEncoderTests : MeasureFixture
    {
        public static IEnumerable<string> AllBmpFiles => TestImages.Bmp.All;

        public JpegEncoderTests(ITestOutputHelper output)
            : base(output)
        {
        }

        [Theory]
        [WithFile(TestImages.Jpeg.Baseline.Snake, PixelTypes.StandardImageClass, 75, JpegSubsample.Ratio420)]
        [WithFile(TestImages.Jpeg.Baseline.Lake, PixelTypes.StandardImageClass, 75, JpegSubsample.Ratio420)]
        [WithFile(TestImages.Jpeg.Baseline.Snake, PixelTypes.StandardImageClass, 75, JpegSubsample.Ratio444)]
        [WithFile(TestImages.Jpeg.Baseline.Lake, PixelTypes.StandardImageClass, 75, JpegSubsample.Ratio444)]
        public void LoadResizeSave<TColor>(TestImageProvider<TColor> provider, int quality, JpegSubsample subsample)
            where TColor : struct, IPackedPixel, IEquatable<TColor>
        {
            using (Image<TColor> image = provider.GetImage().Resize(new ResizeOptions { Size = new Size(150, 100), Mode = ResizeMode.Max }))
            {
                image.Quality = quality;
                image.ExifProfile = null; // Reduce the size of the file
                JpegEncoder encoder = new JpegEncoder { Subsample = subsample, Quality = quality };

                provider.Utility.TestName += $"{subsample}_Q{quality}";
                provider.Utility.SaveTestOutputFile(image, "png");
                provider.Utility.SaveTestOutputFile(image, "jpg", encoder);
            }
        }

        [Theory]
        [WithFileCollection(nameof(AllBmpFiles), PixelTypes.Color | PixelTypes.StandardImageClass | PixelTypes.Argb, JpegSubsample.Ratio420, 75)]
        [WithFileCollection(nameof(AllBmpFiles), PixelTypes.Color | PixelTypes.StandardImageClass | PixelTypes.Argb, JpegSubsample.Ratio444, 75)]
        public void OpenBmp_SaveJpeg<TColor>(TestImageProvider<TColor> provider, JpegSubsample subSample, int quality)
           where TColor : struct, IPackedPixel, IEquatable<TColor>
        {
            using (Image<TColor> image = provider.GetImage())
            {
                ImagingTestCaseUtility utility = provider.Utility;
                utility.TestName += "_" + subSample + "_Q" + quality;

                using (FileStream outputStream = File.OpenWrite(utility.GetTestOutputFileName("jpg")))
                {
                    JpegEncoder encoder = new JpegEncoder()
                                              {
                                                  Subsample = subSample,
                                                  Quality = quality
                                              };

                    image.Save(outputStream, encoder);
                }
            }
        }
    }
}