jellyfin/Jellyfin.Drawing.Skia/SkiaEncoder.cs
2020-07-19 18:06:12 -04:00

551 lines
20 KiB
C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using BlurHashSharp.SkiaSharp;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Extensions;
using MediaBrowser.Model.Drawing;
using Microsoft.Extensions.Logging;
using SkiaSharp;
using static Jellyfin.Drawing.Skia.SkiaHelper;
namespace Jellyfin.Drawing.Skia
{
/// <summary>
/// Image encoder that uses <see cref="SkiaSharp"/> to manipulate images.
/// </summary>
public class SkiaEncoder : IImageEncoder
{
private static readonly HashSet<string> _transparentImageTypes
= new HashSet<string>(StringComparer.OrdinalIgnoreCase) { ".png", ".gif", ".webp" };
private readonly ILogger<SkiaEncoder> _logger;
private readonly IApplicationPaths _appPaths;
/// <summary>
/// Initializes a new instance of the <see cref="SkiaEncoder"/> class.
/// </summary>
/// <param name="logger">The application logger.</param>
/// <param name="appPaths">The application paths.</param>
public SkiaEncoder(ILogger<SkiaEncoder> logger, IApplicationPaths appPaths)
{
_logger = logger;
_appPaths = appPaths;
}
/// <inheritdoc/>
public string Name => "Skia";
/// <inheritdoc/>
public bool SupportsImageCollageCreation => true;
/// <inheritdoc/>
public bool SupportsImageEncoding => true;
/// <inheritdoc/>
public IReadOnlyCollection<string> SupportedInputFormats =>
new HashSet<string>(StringComparer.OrdinalIgnoreCase)
{
"jpeg",
"jpg",
"png",
"dng",
"webp",
"gif",
"bmp",
"ico",
"astc",
"ktx",
"pkm",
"wbmp",
// TODO: check if these are supported on multiple platforms
// https://github.com/google/skia/blob/master/infra/bots/recipes/test.py#L454
// working on windows at least
"cr2",
"nef",
"arw"
};
/// <inheritdoc/>
public IReadOnlyCollection<ImageFormat> SupportedOutputFormats
=> new HashSet<ImageFormat>() { ImageFormat.Webp, ImageFormat.Jpg, ImageFormat.Png };
/// <summary>
/// Check if the native lib is available.
/// </summary>
/// <returns>True if the native lib is available, otherwise false.</returns>
public static bool IsNativeLibAvailable()
{
try
{
// test an operation that requires the native library
SKPMColor.PreMultiply(SKColors.Black);
return true;
}
catch (Exception)
{
return false;
}
}
private static bool IsTransparent(SKColor color)
=> (color.Red == 255 && color.Green == 255 && color.Blue == 255) || color.Alpha == 0;
/// <summary>
/// Convert a <see cref="ImageFormat"/> to a <see cref="SKEncodedImageFormat"/>.
/// </summary>
/// <param name="selectedFormat">The format to convert.</param>
/// <returns>The converted format.</returns>
public static SKEncodedImageFormat GetImageFormat(ImageFormat selectedFormat)
{
return selectedFormat switch
{
ImageFormat.Bmp => SKEncodedImageFormat.Bmp,
ImageFormat.Jpg => SKEncodedImageFormat.Jpeg,
ImageFormat.Gif => SKEncodedImageFormat.Gif,
ImageFormat.Webp => SKEncodedImageFormat.Webp,
_ => 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;
while (topmost < bitmap.Height && IsTransparentRow(bitmap, topmost))
{
topmost++;
}
int bottommost = bitmap.Height;
while (bottommost >= 0 && IsTransparentRow(bitmap, bottommost - 1))
{
bottommost--;
}
var leftmost = 0;
while (leftmost < bitmap.Width && IsTransparentColumn(bitmap, leftmost))
{
leftmost++;
}
var rightmost = bitmap.Width;
while (rightmost >= 0 && IsTransparentColumn(bitmap, rightmost - 1))
{
rightmost--;
}
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);
}
/// <inheritdoc />
/// <exception cref="ArgumentNullException">The path is null.</exception>
/// <exception cref="FileNotFoundException">The path is not valid.</exception>
/// <exception cref="SkiaCodecException">The file at the specified path could not be used to generate a codec.</exception>
public ImageDimensions GetImageSize(string path)
{
if (!File.Exists(path))
{
throw new FileNotFoundException("File not found", path);
}
using var codec = SKCodec.Create(path, out SKCodecResult result);
EnsureSuccess(result);
var info = codec.Info;
return new ImageDimensions(info.Width, info.Height);
}
/// <inheritdoc />
/// <exception cref="ArgumentNullException">The path is null.</exception>
/// <exception cref="FileNotFoundException">The path is not valid.</exception>
/// <exception cref="SkiaCodecException">The file at the specified path could not be used to generate a codec.</exception>
public string GetImageBlurHash(int xComp, int yComp, string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
return BlurHashEncoder.Encode(xComp, yComp, path);
}
private static bool HasDiacritics(string text)
=> !string.Equals(text, text.RemoveDiacritics(), StringComparison.Ordinal);
private bool RequiresSpecialCharacterHack(string path)
{
for (int i = 0; i < path.Length; i++)
{
if (char.GetUnicodeCategory(path[i]) == UnicodeCategory.OtherLetter)
{
return true;
}
}
return HasDiacritics(path);
}
private string NormalizePath(string path)
{
if (!RequiresSpecialCharacterHack(path))
{
return path;
}
var tempPath = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + Path.GetExtension(path));
Directory.CreateDirectory(Path.GetDirectoryName(tempPath));
File.Copy(path, tempPath, true);
return tempPath;
}
private static SKEncodedOrigin GetSKEncodedOrigin(ImageOrientation? orientation)
{
if (!orientation.HasValue)
{
return SKEncodedOrigin.TopLeft;
}
return orientation.Value switch
{
ImageOrientation.TopRight => SKEncodedOrigin.TopRight,
ImageOrientation.RightTop => SKEncodedOrigin.RightTop,
ImageOrientation.RightBottom => SKEncodedOrigin.RightBottom,
ImageOrientation.LeftTop => SKEncodedOrigin.LeftTop,
ImageOrientation.LeftBottom => SKEncodedOrigin.LeftBottom,
ImageOrientation.BottomRight => SKEncodedOrigin.BottomRight,
ImageOrientation.BottomLeft => SKEncodedOrigin.BottomLeft,
_ => SKEncodedOrigin.TopLeft
};
}
/// <summary>
/// Decode an image.
/// </summary>
/// <param name="path">The filepath of the image to decode.</param>
/// <param name="forceCleanBitmap">Whether to force clean the bitmap.</param>
/// <param name="orientation">The orientation of the image.</param>
/// <param name="origin">The detected origin of the image.</param>
/// <returns>The resulting bitmap of the image.</returns>
internal SKBitmap? Decode(string path, bool forceCleanBitmap, ImageOrientation? orientation, out SKEncodedOrigin origin)
{
if (!File.Exists(path))
{
throw new FileNotFoundException("File not found", path);
}
var requiresTransparencyHack = _transparentImageTypes.Contains(Path.GetExtension(path));
if (requiresTransparencyHack || forceCleanBitmap)
{
using var codec = SKCodec.Create(NormalizePath(path));
if (codec == null)
{
origin = GetSKEncodedOrigin(orientation);
return null;
}
// create the bitmap
var bitmap = new SKBitmap(codec.Info.Width, codec.Info.Height, !requiresTransparencyHack);
// decode
_ = codec.GetPixels(bitmap.Info, bitmap.GetPixels());
origin = codec.EncodedOrigin;
return bitmap;
}
var resultBitmap = SKBitmap.Decode(NormalizePath(path));
if (resultBitmap == null)
{
return Decode(path, true, 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, 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, orientation, out origin);
return bitmap == null ? null : CropWhiteSpace(bitmap);
}
return Decode(path, forceAnalyzeBitmap, orientation, out origin);
}
private SKBitmap? GetBitmap(string path, bool cropWhitespace, bool autoOrient, ImageOrientation? orientation)
{
if (autoOrient)
{
var bitmap = GetBitmap(path, cropWhitespace, true, orientation, out var origin);
if (bitmap != null && origin != SKEncodedOrigin.TopLeft)
{
using (bitmap)
{
return OrientImage(bitmap, origin);
}
}
return bitmap;
}
return GetBitmap(path, cropWhitespace, false, orientation, out _);
}
private SKBitmap OrientImage(SKBitmap bitmap, SKEncodedOrigin origin)
{
if (origin == SKEncodedOrigin.Default)
{
return bitmap;
}
var needsFlip = origin == SKEncodedOrigin.LeftBottom
|| origin == SKEncodedOrigin.LeftTop
|| origin == SKEncodedOrigin.RightBottom
|| origin == SKEncodedOrigin.RightTop;
var rotated = needsFlip
? new SKBitmap(bitmap.Height, bitmap.Width)
: new SKBitmap(bitmap.Width, bitmap.Height);
using var surface = new SKCanvas(rotated);
var midX = (float)rotated.Width / 2;
var midY = (float)rotated.Height / 2;
switch (origin)
{
case SKEncodedOrigin.TopRight:
surface.Scale(-1, 1, midX, midY);
break;
case SKEncodedOrigin.BottomRight:
surface.RotateDegrees(180, midX, midY);
break;
case SKEncodedOrigin.BottomLeft:
surface.Scale(1, -1, midX, midY);
break;
case SKEncodedOrigin.LeftTop:
surface.Translate(0, -rotated.Height);
surface.Scale(1, -1, midX, midY);
surface.RotateDegrees(-90);
break;
case SKEncodedOrigin.RightTop:
surface.Translate(rotated.Width, 0);
surface.RotateDegrees(90);
break;
case SKEncodedOrigin.RightBottom:
surface.Translate(rotated.Width, 0);
surface.Scale(1, -1, midX, midY);
surface.RotateDegrees(90);
break;
case SKEncodedOrigin.LeftBottom:
surface.Translate(0, rotated.Height);
surface.RotateDegrees(-90);
break;
}
surface.DrawBitmap(bitmap, 0, 0);
return rotated;
}
/// <inheritdoc/>
public string EncodeImage(string inputPath, DateTime dateModified, string outputPath, bool autoOrient, ImageOrientation? orientation, int quality, ImageProcessingOptions options, ImageFormat selectedOutputFormat)
{
if (inputPath.Length == 0)
{
throw new ArgumentException("String can't be empty.", nameof(inputPath));
}
if (outputPath.Length == 0)
{
throw new ArgumentException("String can't be empty.", 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 InvalidDataException($"Skia unable to read image {inputPath}");
}
var originalImageSize = new ImageDimensions(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 = newImageSize.Width;
var height = 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)
{
Directory.CreateDirectory(Path.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);
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);
}
Directory.CreateDirectory(Path.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;
}
/// <inheritdoc/>
public void CreateImageCollage(ImageCollageOptions options)
{
double ratio = (double)options.Width / options.Height;
if (ratio >= 1.4)
{
new StripCollageBuilder(this).BuildThumbCollage(options.InputPaths, options.OutputPath, options.Width, options.Height);
}
else if (ratio >= .9)
{
new StripCollageBuilder(this).BuildSquareCollage(options.InputPaths, options.OutputPath, options.Width, options.Height);
}
else
{
// TODO: Create Poster collage capability
new StripCollageBuilder(this).BuildSquareCollage(options.InputPaths, options.OutputPath, options.Width, options.Height);
}
}
private void DrawIndicator(SKCanvas canvas, int imageWidth, int imageHeight, ImageProcessingOptions options)
{
try
{
var currentImageSize = new ImageDimensions(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");
}
}
}
}