ImageSharp/tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs at f8573e334a4673a31665ee280a10b0e4eb96a15a · SixLabors/ImageSharp · GitHub

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

namespace ImageSharp.Tests
{
    using System.IO;
    using System.Text;
    using Xunit;

    using ImageSharp.Formats;
    using ImageSharp.PixelFormats;

    public class PngDecoderTests
    {
        private const PixelTypes PixelTypes = Tests.PixelTypes.Rgba32 | Tests.PixelTypes.RgbaVector | Tests.PixelTypes.Argb32;

        public static readonly string[] TestFiles =
            {
                TestImages.Png.Splash, TestImages.Png.Indexed, TestImages.Png.Interlaced, TestImages.Png.FilterVar,
                TestImages.Png.Bad.ChunkLength1, TestImages.Png.Bad.ChunkLength2, TestImages.Png.Rgb48Bpp, TestImages.Png.Rgb48BppInterlaced
            };

        [Theory]
        [WithFileCollection(nameof(TestFiles), PixelTypes)]
        public void DecodeAndReSave<TPixel>(TestImageProvider<TPixel> imageProvider)
            where TPixel : struct, IPixel<TPixel>
        {
            using (Image<TPixel> image = imageProvider.GetImage())
            {
                imageProvider.Utility.SaveTestOutputFile(image, "bmp");
            }
        }

        [Fact]
        public void Decode_IgnoreMetadataIsFalse_TextChunckIsRead()
        {
            PngDecoder options = new PngDecoder()
            {
                IgnoreMetadata = false
            };

            TestFile testFile = TestFile.Create(TestImages.Png.Blur);

            using (Image<Rgba32> image = testFile.CreateImage(options))
            {
                Assert.Equal(1, image.MetaData.Properties.Count);
                Assert.Equal("Software", image.MetaData.Properties[0].Name);
                Assert.Equal("paint.net 4.0.6", image.MetaData.Properties[0].Value);
            }
        }

        [Fact]
        public void Decode_IgnoreMetadataIsTrue_TextChunksAreIgnored()
        {
            PngDecoder options = new PngDecoder()
            {
                IgnoreMetadata = true
            };

            TestFile testFile = TestFile.Create(TestImages.Png.Blur);

            using (Image<Rgba32> image = testFile.CreateImage(options))
            {
                Assert.Equal(0, image.MetaData.Properties.Count);
            }
        }

        [Fact]
        public void Decode_TextEncodingSetToUnicode_TextIsReadWithCorrectEncoding()
        {
            PngDecoder options = new PngDecoder()
            {
                TextEncoding = Encoding.Unicode
            };

            TestFile testFile = TestFile.Create(TestImages.Png.Blur);

            using (Image<Rgba32> image = testFile.CreateImage(options))
            {
                Assert.Equal(1, image.MetaData.Properties.Count);
                Assert.Equal("潓瑦慷敲", image.MetaData.Properties[0].Name);
            }
        }

        [Theory]
        [InlineData(TestImages.Png.Bpp1, 1)]
        [InlineData(TestImages.Png.Gray4Bpp, 4)]
        [InlineData(TestImages.Png.Palette8Bpp, 8)]
        [InlineData(TestImages.Png.Pd, 24)]
        [InlineData(TestImages.Png.Blur, 32)]
        [InlineData(TestImages.Png.Rgb48Bpp, 48)]
        [InlineData(TestImages.Png.Rgb48BppInterlaced, 48)]
        public void DetectPixelSize(string imagePath, int expectedPixelSize)
        {
            TestFile testFile = TestFile.Create(imagePath);
            using (var stream = new MemoryStream(testFile.Bytes, false))
            {
                Assert.Equal(expectedPixelSize, Image.DetectPixelSize(stream));
            }
        }
    }
}