551 lines
20 KiB
C#
551 lines
20 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using BlurHashSharp.SkiaSharp;
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using MediaBrowser.Common.Configuration;
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using MediaBrowser.Controller.Drawing;
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using MediaBrowser.Controller.Extensions;
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using MediaBrowser.Model.Drawing;
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using Microsoft.Extensions.Logging;
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using SkiaSharp;
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using static Jellyfin.Drawing.Skia.SkiaHelper;
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namespace Jellyfin.Drawing.Skia
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{
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/// <summary>
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/// Image encoder that uses <see cref="SkiaSharp"/> to manipulate images.
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/// </summary>
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public class SkiaEncoder : IImageEncoder
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{
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private static readonly HashSet<string> _transparentImageTypes
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= new HashSet<string>(StringComparer.OrdinalIgnoreCase) { ".png", ".gif", ".webp" };
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private readonly ILogger<SkiaEncoder> _logger;
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private readonly IApplicationPaths _appPaths;
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/// <summary>
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/// Initializes a new instance of the <see cref="SkiaEncoder"/> class.
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/// </summary>
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/// <param name="logger">The application logger.</param>
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/// <param name="appPaths">The application paths.</param>
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public SkiaEncoder(ILogger<SkiaEncoder> logger, IApplicationPaths appPaths)
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{
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_logger = logger;
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_appPaths = appPaths;
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}
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/// <inheritdoc/>
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public string Name => "Skia";
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/// <inheritdoc/>
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public bool SupportsImageCollageCreation => true;
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/// <inheritdoc/>
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public bool SupportsImageEncoding => true;
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/// <inheritdoc/>
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public IReadOnlyCollection<string> SupportedInputFormats =>
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new HashSet<string>(StringComparer.OrdinalIgnoreCase)
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{
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"jpeg",
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"jpg",
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"png",
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"dng",
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"webp",
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"gif",
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"bmp",
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"ico",
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"astc",
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"ktx",
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"pkm",
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"wbmp",
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// TODO: check if these are supported on multiple platforms
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// https://github.com/google/skia/blob/master/infra/bots/recipes/test.py#L454
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// working on windows at least
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"cr2",
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"nef",
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"arw"
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};
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/// <inheritdoc/>
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public IReadOnlyCollection<ImageFormat> SupportedOutputFormats
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=> new HashSet<ImageFormat>() { ImageFormat.Webp, ImageFormat.Jpg, ImageFormat.Png };
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/// <summary>
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/// Check if the native lib is available.
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/// </summary>
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/// <returns>True if the native lib is available, otherwise false.</returns>
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public static bool IsNativeLibAvailable()
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{
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try
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{
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// test an operation that requires the native library
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SKPMColor.PreMultiply(SKColors.Black);
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return true;
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}
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catch (Exception)
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{
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return false;
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}
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}
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private static bool IsTransparent(SKColor color)
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=> (color.Red == 255 && color.Green == 255 && color.Blue == 255) || color.Alpha == 0;
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/// <summary>
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/// Convert a <see cref="ImageFormat"/> to a <see cref="SKEncodedImageFormat"/>.
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/// </summary>
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/// <param name="selectedFormat">The format to convert.</param>
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/// <returns>The converted format.</returns>
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public static SKEncodedImageFormat GetImageFormat(ImageFormat selectedFormat)
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{
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return selectedFormat switch
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{
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ImageFormat.Bmp => SKEncodedImageFormat.Bmp,
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ImageFormat.Jpg => SKEncodedImageFormat.Jpeg,
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ImageFormat.Gif => SKEncodedImageFormat.Gif,
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ImageFormat.Webp => SKEncodedImageFormat.Webp,
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_ => SKEncodedImageFormat.Png
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};
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}
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private static bool IsTransparentRow(SKBitmap bmp, int row)
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{
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for (var i = 0; i < bmp.Width; ++i)
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{
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if (!IsTransparent(bmp.GetPixel(i, row)))
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{
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return false;
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}
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}
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return true;
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}
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private static bool IsTransparentColumn(SKBitmap bmp, int col)
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{
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for (var i = 0; i < bmp.Height; ++i)
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{
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if (!IsTransparent(bmp.GetPixel(col, i)))
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{
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return false;
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}
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}
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return true;
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}
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private SKBitmap CropWhiteSpace(SKBitmap bitmap)
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{
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var topmost = 0;
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while (topmost < bitmap.Height && IsTransparentRow(bitmap, topmost))
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{
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topmost++;
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}
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int bottommost = bitmap.Height;
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while (bottommost >= 0 && IsTransparentRow(bitmap, bottommost - 1))
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{
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bottommost--;
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}
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var leftmost = 0;
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while (leftmost < bitmap.Width && IsTransparentColumn(bitmap, leftmost))
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{
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leftmost++;
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}
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var rightmost = bitmap.Width;
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while (rightmost >= 0 && IsTransparentColumn(bitmap, rightmost - 1))
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{
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rightmost--;
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}
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var newRect = SKRectI.Create(leftmost, topmost, rightmost - leftmost, bottommost - topmost);
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using var image = SKImage.FromBitmap(bitmap);
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using var subset = image.Subset(newRect);
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return SKBitmap.FromImage(subset);
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}
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/// <inheritdoc />
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/// <exception cref="ArgumentNullException">The path is null.</exception>
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/// <exception cref="FileNotFoundException">The path is not valid.</exception>
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/// <exception cref="SkiaCodecException">The file at the specified path could not be used to generate a codec.</exception>
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public ImageDimensions GetImageSize(string path)
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{
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if (!File.Exists(path))
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{
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throw new FileNotFoundException("File not found", path);
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}
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using var codec = SKCodec.Create(path, out SKCodecResult result);
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EnsureSuccess(result);
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var info = codec.Info;
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return new ImageDimensions(info.Width, info.Height);
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}
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/// <inheritdoc />
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/// <exception cref="ArgumentNullException">The path is null.</exception>
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/// <exception cref="FileNotFoundException">The path is not valid.</exception>
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/// <exception cref="SkiaCodecException">The file at the specified path could not be used to generate a codec.</exception>
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public string GetImageBlurHash(int xComp, int yComp, string path)
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{
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if (path == null)
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{
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throw new ArgumentNullException(nameof(path));
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}
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return BlurHashEncoder.Encode(xComp, yComp, path);
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}
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private static bool HasDiacritics(string text)
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=> !string.Equals(text, text.RemoveDiacritics(), StringComparison.Ordinal);
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private bool RequiresSpecialCharacterHack(string path)
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{
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for (int i = 0; i < path.Length; i++)
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{
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if (char.GetUnicodeCategory(path[i]) == UnicodeCategory.OtherLetter)
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{
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return true;
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}
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}
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return HasDiacritics(path);
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}
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private string NormalizePath(string path)
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{
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if (!RequiresSpecialCharacterHack(path))
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{
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return path;
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}
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var tempPath = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + Path.GetExtension(path));
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Directory.CreateDirectory(Path.GetDirectoryName(tempPath));
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File.Copy(path, tempPath, true);
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return tempPath;
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}
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private static SKEncodedOrigin GetSKEncodedOrigin(ImageOrientation? orientation)
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{
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if (!orientation.HasValue)
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{
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return SKEncodedOrigin.TopLeft;
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}
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return orientation.Value switch
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{
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ImageOrientation.TopRight => SKEncodedOrigin.TopRight,
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ImageOrientation.RightTop => SKEncodedOrigin.RightTop,
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ImageOrientation.RightBottom => SKEncodedOrigin.RightBottom,
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ImageOrientation.LeftTop => SKEncodedOrigin.LeftTop,
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ImageOrientation.LeftBottom => SKEncodedOrigin.LeftBottom,
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ImageOrientation.BottomRight => SKEncodedOrigin.BottomRight,
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ImageOrientation.BottomLeft => SKEncodedOrigin.BottomLeft,
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_ => SKEncodedOrigin.TopLeft
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};
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}
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/// <summary>
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/// Decode an image.
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/// </summary>
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/// <param name="path">The filepath of the image to decode.</param>
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/// <param name="forceCleanBitmap">Whether to force clean the bitmap.</param>
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/// <param name="orientation">The orientation of the image.</param>
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/// <param name="origin">The detected origin of the image.</param>
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/// <returns>The resulting bitmap of the image.</returns>
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internal SKBitmap? Decode(string path, bool forceCleanBitmap, ImageOrientation? orientation, out SKEncodedOrigin origin)
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{
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if (!File.Exists(path))
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{
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throw new FileNotFoundException("File not found", path);
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}
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var requiresTransparencyHack = _transparentImageTypes.Contains(Path.GetExtension(path));
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if (requiresTransparencyHack || forceCleanBitmap)
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{
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using var codec = SKCodec.Create(NormalizePath(path));
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if (codec == null)
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{
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origin = GetSKEncodedOrigin(orientation);
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return null;
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}
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// create the bitmap
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var bitmap = new SKBitmap(codec.Info.Width, codec.Info.Height, !requiresTransparencyHack);
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// decode
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_ = codec.GetPixels(bitmap.Info, bitmap.GetPixels());
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origin = codec.EncodedOrigin;
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return bitmap;
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}
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var resultBitmap = SKBitmap.Decode(NormalizePath(path));
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if (resultBitmap == null)
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{
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return Decode(path, true, orientation, out origin);
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}
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// If we have to resize these they often end up distorted
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if (resultBitmap.ColorType == SKColorType.Gray8)
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{
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using (resultBitmap)
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{
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return Decode(path, true, orientation, out origin);
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}
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}
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origin = SKEncodedOrigin.TopLeft;
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return resultBitmap;
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}
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private SKBitmap? GetBitmap(string path, bool cropWhitespace, bool forceAnalyzeBitmap, ImageOrientation? orientation, out SKEncodedOrigin origin)
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{
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if (cropWhitespace)
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{
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using var bitmap = Decode(path, forceAnalyzeBitmap, orientation, out origin);
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return bitmap == null ? null : CropWhiteSpace(bitmap);
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}
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return Decode(path, forceAnalyzeBitmap, orientation, out origin);
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}
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private SKBitmap? GetBitmap(string path, bool cropWhitespace, bool autoOrient, ImageOrientation? orientation)
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{
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if (autoOrient)
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{
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var bitmap = GetBitmap(path, cropWhitespace, true, orientation, out var origin);
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if (bitmap != null && origin != SKEncodedOrigin.TopLeft)
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{
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using (bitmap)
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{
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return OrientImage(bitmap, origin);
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}
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}
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return bitmap;
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}
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return GetBitmap(path, cropWhitespace, false, orientation, out _);
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}
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private SKBitmap OrientImage(SKBitmap bitmap, SKEncodedOrigin origin)
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{
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if (origin == SKEncodedOrigin.Default)
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{
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return bitmap;
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}
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var needsFlip = origin == SKEncodedOrigin.LeftBottom
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|| origin == SKEncodedOrigin.LeftTop
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|| origin == SKEncodedOrigin.RightBottom
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|| origin == SKEncodedOrigin.RightTop;
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var rotated = needsFlip
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? new SKBitmap(bitmap.Height, bitmap.Width)
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: new SKBitmap(bitmap.Width, bitmap.Height);
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using var surface = new SKCanvas(rotated);
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var midX = (float)rotated.Width / 2;
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var midY = (float)rotated.Height / 2;
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switch (origin)
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{
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case SKEncodedOrigin.TopRight:
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surface.Scale(-1, 1, midX, midY);
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break;
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case SKEncodedOrigin.BottomRight:
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surface.RotateDegrees(180, midX, midY);
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break;
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case SKEncodedOrigin.BottomLeft:
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surface.Scale(1, -1, midX, midY);
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break;
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case SKEncodedOrigin.LeftTop:
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surface.Translate(0, -rotated.Height);
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surface.Scale(1, -1, midX, midY);
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surface.RotateDegrees(-90);
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break;
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case SKEncodedOrigin.RightTop:
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surface.Translate(rotated.Width, 0);
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surface.RotateDegrees(90);
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break;
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case SKEncodedOrigin.RightBottom:
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surface.Translate(rotated.Width, 0);
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surface.Scale(1, -1, midX, midY);
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surface.RotateDegrees(90);
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break;
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case SKEncodedOrigin.LeftBottom:
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surface.Translate(0, rotated.Height);
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surface.RotateDegrees(-90);
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break;
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}
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surface.DrawBitmap(bitmap, 0, 0);
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return rotated;
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}
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/// <inheritdoc/>
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public string EncodeImage(string inputPath, DateTime dateModified, string outputPath, bool autoOrient, ImageOrientation? orientation, int quality, ImageProcessingOptions options, ImageFormat selectedOutputFormat)
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{
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if (inputPath.Length == 0)
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{
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throw new ArgumentException("String can't be empty.", nameof(inputPath));
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}
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if (outputPath.Length == 0)
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{
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throw new ArgumentException("String can't be empty.", nameof(outputPath));
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}
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var skiaOutputFormat = GetImageFormat(selectedOutputFormat);
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var hasBackgroundColor = !string.IsNullOrWhiteSpace(options.BackgroundColor);
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var hasForegroundColor = !string.IsNullOrWhiteSpace(options.ForegroundLayer);
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var blur = options.Blur ?? 0;
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var hasIndicator = options.AddPlayedIndicator || options.UnplayedCount.HasValue || !options.PercentPlayed.Equals(0);
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using var bitmap = GetBitmap(inputPath, options.CropWhiteSpace, autoOrient, orientation);
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if (bitmap == null)
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{
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throw new InvalidDataException($"Skia unable to read image {inputPath}");
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}
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var originalImageSize = new ImageDimensions(bitmap.Width, bitmap.Height);
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if (!options.CropWhiteSpace
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&& options.HasDefaultOptions(inputPath, originalImageSize)
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&& !autoOrient)
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{
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// Just spit out the original file if all the options are default
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return inputPath;
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}
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var newImageSize = ImageHelper.GetNewImageSize(options, originalImageSize);
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var width = newImageSize.Width;
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var height = newImageSize.Height;
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using var resizedBitmap = new SKBitmap(width, height, bitmap.ColorType, bitmap.AlphaType);
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// scale image
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bitmap.ScalePixels(resizedBitmap, SKFilterQuality.High);
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// If all we're doing is resizing then we can stop now
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if (!hasBackgroundColor && !hasForegroundColor && blur == 0 && !hasIndicator)
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{
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Directory.CreateDirectory(Path.GetDirectoryName(outputPath));
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using var outputStream = new SKFileWStream(outputPath);
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using var pixmap = new SKPixmap(new SKImageInfo(width, height), resizedBitmap.GetPixels());
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pixmap.Encode(outputStream, skiaOutputFormat, quality);
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return outputPath;
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}
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// create bitmap to use for canvas drawing used to draw into bitmap
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using var saveBitmap = new SKBitmap(width, height);
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using var canvas = new SKCanvas(saveBitmap);
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// set background color if present
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if (hasBackgroundColor)
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{
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canvas.Clear(SKColor.Parse(options.BackgroundColor));
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}
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// Add blur if option is present
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if (blur > 0)
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{
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// create image from resized bitmap to apply blur
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using var paint = new SKPaint();
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using var filter = SKImageFilter.CreateBlur(blur, blur);
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paint.ImageFilter = filter;
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canvas.DrawBitmap(resizedBitmap, SKRect.Create(width, height), paint);
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}
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else
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{
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// draw resized bitmap onto canvas
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canvas.DrawBitmap(resizedBitmap, SKRect.Create(width, height));
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}
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// If foreground layer present then draw
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if (hasForegroundColor)
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{
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if (!double.TryParse(options.ForegroundLayer, out double opacity))
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{
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opacity = .4;
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}
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canvas.DrawColor(new SKColor(0, 0, 0, (byte)((1 - opacity) * 0xFF)), SKBlendMode.SrcOver);
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}
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if (hasIndicator)
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{
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DrawIndicator(canvas, width, height, options);
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}
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Directory.CreateDirectory(Path.GetDirectoryName(outputPath));
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using (var outputStream = new SKFileWStream(outputPath))
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{
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using (var pixmap = new SKPixmap(new SKImageInfo(width, height), saveBitmap.GetPixels()))
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{
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pixmap.Encode(outputStream, skiaOutputFormat, quality);
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}
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}
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return outputPath;
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}
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/// <inheritdoc/>
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public void CreateImageCollage(ImageCollageOptions options)
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{
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double ratio = (double)options.Width / options.Height;
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if (ratio >= 1.4)
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{
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new StripCollageBuilder(this).BuildThumbCollage(options.InputPaths, options.OutputPath, options.Width, options.Height);
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}
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else if (ratio >= .9)
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{
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new StripCollageBuilder(this).BuildSquareCollage(options.InputPaths, options.OutputPath, options.Width, options.Height);
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}
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else
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{
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// TODO: Create Poster collage capability
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new StripCollageBuilder(this).BuildSquareCollage(options.InputPaths, options.OutputPath, options.Width, options.Height);
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}
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}
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private void DrawIndicator(SKCanvas canvas, int imageWidth, int imageHeight, ImageProcessingOptions options)
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{
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try
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{
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var currentImageSize = new ImageDimensions(imageWidth, imageHeight);
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if (options.AddPlayedIndicator)
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{
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PlayedIndicatorDrawer.DrawPlayedIndicator(canvas, currentImageSize);
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}
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else if (options.UnplayedCount.HasValue)
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{
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UnplayedCountIndicator.DrawUnplayedCountIndicator(canvas, currentImageSize, options.UnplayedCount.Value);
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}
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if (options.PercentPlayed > 0)
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{
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PercentPlayedDrawer.Process(canvas, currentImageSize, options.PercentPlayed);
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}
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error drawing indicator overlay");
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}
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}
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}
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}
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