using System; using System.Globalization; using System.IO; using System.Linq; using System.Reflection; using MediaBrowser.Common.Configuration; using MediaBrowser.Controller.Drawing; using MediaBrowser.Controller.Extensions; using MediaBrowser.Model.Drawing; using MediaBrowser.Model.Globalization; using MediaBrowser.Model.IO; using Microsoft.Extensions.Logging; using SkiaSharp; namespace Emby.Drawing { public class SkiaEncoder : IImageEncoder { private readonly ILogger _logger; private static IApplicationPaths _appPaths; private readonly IFileSystem _fileSystem; private static ILocalizationManager _localizationManager; public SkiaEncoder( ILoggerFactory loggerFactory, IApplicationPaths appPaths, IFileSystem fileSystem, ILocalizationManager localizationManager) { _logger = loggerFactory.CreateLogger("ImageEncoder"); _appPaths = appPaths; _fileSystem = fileSystem; _localizationManager = localizationManager; LogVersion(); } public string[] SupportedInputFormats => new[] { "jpeg", "jpg", "png", "dng", "webp", "gif", "bmp", "ico", "astc", "ktx", "pkm", "wbmp", // TODO // Are all of these supported? https://github.com/google/skia/blob/master/infra/bots/recipes/test.py#L454 // working on windows at least "cr2", "nef", "arw" }; public ImageFormat[] SupportedOutputFormats => new[] { ImageFormat.Webp, ImageFormat.Jpg, ImageFormat.Png }; private void LogVersion() { // test an operation that requires the native library SKPMColor.PreMultiply(SKColors.Black); _logger.LogInformation("SkiaSharp version: " + GetVersion()); } public static string GetVersion() { return typeof(SKBitmap).GetTypeInfo().Assembly.GetName().Version.ToString(); } private static bool IsTransparent(SKColor color) { return (color.Red == 255 && color.Green == 255 && color.Blue == 255) || color.Alpha == 0; } public static SKEncodedImageFormat GetImageFormat(ImageFormat selectedFormat) { switch (selectedFormat) { case ImageFormat.Bmp: return SKEncodedImageFormat.Bmp; case ImageFormat.Jpg: return SKEncodedImageFormat.Jpeg; case ImageFormat.Gif: return SKEncodedImageFormat.Gif; case ImageFormat.Webp: return SKEncodedImageFormat.Webp; default: return SKEncodedImageFormat.Png; } } private static bool IsTransparentRow(SKBitmap bmp, int row) { for (var i = 0; i < bmp.Width; ++i) { if (!IsTransparent(bmp.GetPixel(i, row))) { return false; } } return true; } private static bool IsTransparentColumn(SKBitmap bmp, int col) { for (var i = 0; i < bmp.Height; ++i) { if (!IsTransparent(bmp.GetPixel(col, i))) { return false; } } return true; } private SKBitmap CropWhiteSpace(SKBitmap bitmap) { var topmost = 0; for (int row = 0; row < bitmap.Height; ++row) { if (IsTransparentRow(bitmap, row)) topmost = row + 1; else break; } int bottommost = bitmap.Height; for (int row = bitmap.Height - 1; row >= 0; --row) { if (IsTransparentRow(bitmap, row)) bottommost = row; else break; } int leftmost = 0, rightmost = bitmap.Width; for (int col = 0; col < bitmap.Width; ++col) { if (IsTransparentColumn(bitmap, col)) leftmost = col + 1; else break; } for (int col = bitmap.Width - 1; col >= 0; --col) { if (IsTransparentColumn(bitmap, col)) rightmost = col; else break; } var newRect = SKRectI.Create(leftmost, topmost, rightmost - leftmost, bottommost - topmost); using (var image = SKImage.FromBitmap(bitmap)) using (var subset = image.Subset(newRect)) { return SKBitmap.FromImage(subset); } } public ImageSize GetImageSize(string path) { using (var s = new SKFileStream(path)) using (var codec = SKCodec.Create(s)) { var info = codec.Info; return new ImageSize { Width = info.Width, Height = info.Height }; } } private static bool HasDiacritics(string text) { return !string.Equals(text, text.RemoveDiacritics(), StringComparison.Ordinal); } private static bool RequiresSpecialCharacterHack(string path) { if (_localizationManager.HasUnicodeCategory(path, UnicodeCategory.OtherLetter)) { return true; } if (HasDiacritics(path)) { return true; } return false; } private static string NormalizePath(string path, IFileSystem fileSystem) { if (!RequiresSpecialCharacterHack(path)) { return path; } var tempPath = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + Path.GetExtension(path) ?? string.Empty); fileSystem.CreateDirectory(fileSystem.GetDirectoryName(tempPath)); fileSystem.CopyFile(path, tempPath, true); return tempPath; } private static SKEncodedOrigin GetSKEncodedOrigin(ImageOrientation? orientation) { if (!orientation.HasValue) { return SKEncodedOrigin.TopLeft; } switch (orientation.Value) { case ImageOrientation.TopRight: return SKEncodedOrigin.TopRight; case ImageOrientation.RightTop: return SKEncodedOrigin.RightTop; case ImageOrientation.RightBottom: return SKEncodedOrigin.RightBottom; case ImageOrientation.LeftTop: return SKEncodedOrigin.LeftTop; case ImageOrientation.LeftBottom: return SKEncodedOrigin.LeftBottom; case ImageOrientation.BottomRight: return SKEncodedOrigin.BottomRight; case ImageOrientation.BottomLeft: return SKEncodedOrigin.BottomLeft; default: return SKEncodedOrigin.TopLeft; } } private static string[] TransparentImageTypes = new string[] { ".png", ".gif", ".webp" }; internal static SKBitmap Decode(string path, bool forceCleanBitmap, IFileSystem fileSystem, ImageOrientation? orientation, out SKEncodedOrigin origin) { if (!fileSystem.FileExists(path)) { throw new FileNotFoundException("File not found", path); } var requiresTransparencyHack = TransparentImageTypes.Contains(Path.GetExtension(path) ?? string.Empty); if (requiresTransparencyHack || forceCleanBitmap) { using (var stream = new SKFileStream(NormalizePath(path, fileSystem))) using (var codec = SKCodec.Create(stream)) { if (codec == null) { origin = GetSKEncodedOrigin(orientation); return null; } // create the bitmap var bitmap = new SKBitmap(codec.Info.Width, codec.Info.Height, !requiresTransparencyHack); if (bitmap != null) { // decode codec.GetPixels(bitmap.Info, bitmap.GetPixels()); origin = codec.EncodedOrigin; } else { origin = GetSKEncodedOrigin(orientation); } return bitmap; } } var resultBitmap = SKBitmap.Decode(NormalizePath(path, fileSystem)); if (resultBitmap == null) { return Decode(path, true, fileSystem, orientation, out origin); } // If we have to resize these they often end up distorted if (resultBitmap.ColorType == SKColorType.Gray8) { using (resultBitmap) { return Decode(path, true, fileSystem, orientation, out origin); } } origin = SKEncodedOrigin.TopLeft; return resultBitmap; } private SKBitmap GetBitmap(string path, bool cropWhitespace, bool forceAnalyzeBitmap, ImageOrientation? orientation, out SKEncodedOrigin origin) { if (cropWhitespace) { using (var bitmap = Decode(path, forceAnalyzeBitmap, _fileSystem, orientation, out origin)) { return CropWhiteSpace(bitmap); } } return Decode(path, forceAnalyzeBitmap, _fileSystem, orientation, out origin); } private SKBitmap GetBitmap(string path, bool cropWhitespace, bool autoOrient, ImageOrientation? orientation) { SKEncodedOrigin origin; if (autoOrient) { var bitmap = GetBitmap(path, cropWhitespace, true, orientation, out origin); if (bitmap != null) { if (origin != SKEncodedOrigin.TopLeft) { using (bitmap) { return OrientImage(bitmap, origin); } } } return bitmap; } return GetBitmap(path, cropWhitespace, false, orientation, out origin); } private SKBitmap OrientImage(SKBitmap bitmap, SKEncodedOrigin origin) { //var transformations = { // 2: { rotate: 0, flip: true}, // 3: { rotate: 180, flip: false}, // 4: { rotate: 180, flip: true}, // 5: { rotate: 90, flip: true}, // 6: { rotate: 90, flip: false}, // 7: { rotate: 270, flip: true}, // 8: { rotate: 270, flip: false}, //} switch (origin) { case SKEncodedOrigin.TopRight: { var rotated = new SKBitmap(bitmap.Width, bitmap.Height); using (var surface = new SKCanvas(rotated)) { surface.Translate(rotated.Width, 0); surface.Scale(-1, 1); surface.DrawBitmap(bitmap, 0, 0); } return rotated; } case SKEncodedOrigin.BottomRight: { var rotated = new SKBitmap(bitmap.Width, bitmap.Height); using (var surface = new SKCanvas(rotated)) { float px = bitmap.Width; px /= 2; float py = bitmap.Height; py /= 2; surface.RotateDegrees(180, px, py); surface.DrawBitmap(bitmap, 0, 0); } return rotated; } case SKEncodedOrigin.BottomLeft: { var rotated = new SKBitmap(bitmap.Width, bitmap.Height); using (var surface = new SKCanvas(rotated)) { float px = bitmap.Width; px /= 2; float py = bitmap.Height; py /= 2; surface.Translate(rotated.Width, 0); surface.Scale(-1, 1); surface.RotateDegrees(180, px, py); surface.DrawBitmap(bitmap, 0, 0); } return rotated; } case SKEncodedOrigin.LeftTop: { // TODO: Remove dual canvases, had trouble with flipping using (var rotated = new SKBitmap(bitmap.Height, bitmap.Width)) { using (var surface = new SKCanvas(rotated)) { surface.Translate(rotated.Width, 0); surface.RotateDegrees(90); surface.DrawBitmap(bitmap, 0, 0); } var flippedBitmap = new SKBitmap(rotated.Width, rotated.Height); using (var flippedCanvas = new SKCanvas(flippedBitmap)) { flippedCanvas.Translate(flippedBitmap.Width, 0); flippedCanvas.Scale(-1, 1); flippedCanvas.DrawBitmap(rotated, 0, 0); } return flippedBitmap; } } case SKEncodedOrigin.RightTop: { var rotated = new SKBitmap(bitmap.Height, bitmap.Width); using (var surface = new SKCanvas(rotated)) { surface.Translate(rotated.Width, 0); surface.RotateDegrees(90); surface.DrawBitmap(bitmap, 0, 0); } return rotated; } case SKEncodedOrigin.RightBottom: { // TODO: Remove dual canvases, had trouble with flipping using (var rotated = new SKBitmap(bitmap.Height, bitmap.Width)) { using (var surface = new SKCanvas(rotated)) { surface.Translate(0, rotated.Height); surface.RotateDegrees(270); surface.DrawBitmap(bitmap, 0, 0); } var flippedBitmap = new SKBitmap(rotated.Width, rotated.Height); using (var flippedCanvas = new SKCanvas(flippedBitmap)) { flippedCanvas.Translate(flippedBitmap.Width, 0); flippedCanvas.Scale(-1, 1); flippedCanvas.DrawBitmap(rotated, 0, 0); } return flippedBitmap; } } case SKEncodedOrigin.LeftBottom: { var rotated = new SKBitmap(bitmap.Height, bitmap.Width); using (var surface = new SKCanvas(rotated)) { surface.Translate(0, rotated.Height); surface.RotateDegrees(270); surface.DrawBitmap(bitmap, 0, 0); } return rotated; } default: return bitmap; } } public string EncodeImage(string inputPath, DateTime dateModified, string outputPath, bool autoOrient, ImageOrientation? orientation, int quality, ImageProcessingOptions options, ImageFormat selectedOutputFormat) { if (string.IsNullOrWhiteSpace(inputPath)) { throw new ArgumentNullException(nameof(inputPath)); } if (string.IsNullOrWhiteSpace(inputPath)) { throw new ArgumentNullException(nameof(outputPath)); } var skiaOutputFormat = GetImageFormat(selectedOutputFormat); var hasBackgroundColor = !string.IsNullOrWhiteSpace(options.BackgroundColor); var hasForegroundColor = !string.IsNullOrWhiteSpace(options.ForegroundLayer); var blur = options.Blur ?? 0; var hasIndicator = options.AddPlayedIndicator || options.UnplayedCount.HasValue || !options.PercentPlayed.Equals(0); using (var bitmap = GetBitmap(inputPath, options.CropWhiteSpace, autoOrient, orientation)) { if (bitmap == null) { throw new ArgumentOutOfRangeException(string.Format("Skia unable to read image {0}", inputPath)); } //_logger.LogInformation("Color type {0}", bitmap.Info.ColorType); var originalImageSize = new ImageSize(bitmap.Width, bitmap.Height); if (!options.CropWhiteSpace && options.HasDefaultOptions(inputPath, originalImageSize) && !autoOrient) { // Just spit out the original file if all the options are default return inputPath; } var newImageSize = ImageHelper.GetNewImageSize(options, originalImageSize); var width = Convert.ToInt32(Math.Round(newImageSize.Width)); var height = Convert.ToInt32(Math.Round(newImageSize.Height)); using (var resizedBitmap = new SKBitmap(width, height))//, bitmap.ColorType, bitmap.AlphaType)) { // scale image bitmap.ScalePixels(resizedBitmap, SKFilterQuality.High); // If all we're doing is resizing then we can stop now if (!hasBackgroundColor && !hasForegroundColor && blur == 0 && !hasIndicator) { _fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(outputPath)); using (var outputStream = new SKFileWStream(outputPath)) { using (var pixmap = new SKPixmap(new SKImageInfo(width, height), resizedBitmap.GetPixels())) { pixmap.Encode(outputStream, skiaOutputFormat, quality); return outputPath; } } } // create bitmap to use for canvas drawing used to draw into bitmap using (var saveBitmap = new SKBitmap(width, height))//, bitmap.ColorType, bitmap.AlphaType)) using (var canvas = new SKCanvas(saveBitmap)) { // set background color if present if (hasBackgroundColor) { canvas.Clear(SKColor.Parse(options.BackgroundColor)); } // Add blur if option is present if (blur > 0) { // create image from resized bitmap to apply blur using (var paint = new SKPaint()) using (var filter = SKImageFilter.CreateBlur(blur, blur)) { paint.ImageFilter = filter; canvas.DrawBitmap(resizedBitmap, SKRect.Create(width, height), paint); } } else { // draw resized bitmap onto canvas canvas.DrawBitmap(resizedBitmap, SKRect.Create(width, height)); } // If foreground layer present then draw if (hasForegroundColor) { if (!double.TryParse(options.ForegroundLayer, out double opacity)) { opacity = .4; } canvas.DrawColor(new SKColor(0, 0, 0, (byte)((1 - opacity) * 0xFF)), SKBlendMode.SrcOver); } if (hasIndicator) { DrawIndicator(canvas, width, height, options); } _fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(outputPath)); using (var outputStream = new SKFileWStream(outputPath)) { using (var pixmap = new SKPixmap(new SKImageInfo(width, height), saveBitmap.GetPixels())) { pixmap.Encode(outputStream, skiaOutputFormat, quality); } } } } } return outputPath; } public void CreateImageCollage(ImageCollageOptions options) { double ratio = options.Width; ratio /= options.Height; if (ratio >= 1.4) { new StripCollageBuilder(_appPaths, _fileSystem).BuildThumbCollage(options.InputPaths, options.OutputPath, options.Width, options.Height); } else if (ratio >= .9) { new StripCollageBuilder(_appPaths, _fileSystem).BuildSquareCollage(options.InputPaths, options.OutputPath, options.Width, options.Height); } else { // @todo create Poster collage capability new StripCollageBuilder(_appPaths, _fileSystem).BuildSquareCollage(options.InputPaths, options.OutputPath, options.Width, options.Height); } } private void DrawIndicator(SKCanvas canvas, int imageWidth, int imageHeight, ImageProcessingOptions options) { try { var currentImageSize = new ImageSize(imageWidth, imageHeight); if (options.AddPlayedIndicator) { PlayedIndicatorDrawer.DrawPlayedIndicator(canvas, currentImageSize); } else if (options.UnplayedCount.HasValue) { UnplayedCountIndicator.DrawUnplayedCountIndicator(canvas, currentImageSize, options.UnplayedCount.Value); } if (options.PercentPlayed > 0) { PercentPlayedDrawer.Process(canvas, currentImageSize, options.PercentPlayed); } } catch (Exception ex) { _logger.LogError(ex, "Error drawing indicator overlay"); } } public string Name => "Skia"; public bool SupportsImageCollageCreation => true; public bool SupportsImageEncoding => true; } }