jellyfin/Emby.Drawing.Skia/SkiaEncoder.cs
2017-09-22 16:33:01 -04:00

611 lines
22 KiB
C#

using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Model.Drawing;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Logging;
using SkiaSharp;
using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
namespace Emby.Drawing.Skia
{
public class SkiaEncoder : IImageEncoder
{
private readonly ILogger _logger;
private readonly IApplicationPaths _appPaths;
private readonly Func<IHttpClient> _httpClientFactory;
private readonly IFileSystem _fileSystem;
public SkiaEncoder(ILogger logger, IApplicationPaths appPaths, Func<IHttpClient> httpClientFactory, IFileSystem fileSystem)
{
_logger = logger;
_appPaths = appPaths;
_httpClientFactory = httpClientFactory;
_fileSystem = fileSystem;
LogVersion();
}
public string[] SupportedInputFormats
{
get
{
// Some common file name extensions for RAW picture files include: .cr2, .crw, .dng, .nef, .orf, .rw2, .pef, .arw, .sr2, .srf, and .tif.
return new[]
{
"jpeg",
"jpg",
"png",
"dng",
"webp",
"gif",
"bmp",
"ico",
"astc",
"ktx",
"pkm",
"wbmp",
// working on windows at least
"cr2"
};
}
}
public ImageFormat[] SupportedOutputFormats
{
get
{
return new[] { ImageFormat.Webp, ImageFormat.Gif, ImageFormat.Jpg, ImageFormat.Png, ImageFormat.Bmp };
}
}
private void LogVersion()
{
// test an operation that requires the native library
SKPMColor.PreMultiply(SKColors.Black);
_logger.Info("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 string[] TransparentImageTypes = new string[] { ".png", ".gif", ".webp" };
internal static SKBitmap Decode(string path, bool forceCleanBitmap, out SKCodecOrigin origin)
{
var requiresTransparencyHack = TransparentImageTypes.Contains(Path.GetExtension(path) ?? string.Empty);
if (requiresTransparencyHack || forceCleanBitmap)
{
using (var stream = new SKFileStream(path))
{
using (var codec = SKCodec.Create(stream))
{
if (codec == null)
{
origin = SKCodecOrigin.TopLeft;
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.Origin;
}
else
{
origin = SKCodecOrigin.TopLeft;
}
return bitmap;
}
}
}
var resultBitmap = SKBitmap.Decode(path);
if (resultBitmap == null)
{
return Decode(path, true, out origin);
}
// If we have to resize these they often end up distorted
if (resultBitmap.ColorType == SKColorType.Gray8)
{
using (resultBitmap)
{
return Decode(path, true, out origin);
}
}
origin = SKCodecOrigin.TopLeft;
return resultBitmap;
}
private SKBitmap GetBitmap(string path, bool cropWhitespace, bool forceAnalyzeBitmap, out SKCodecOrigin origin)
{
if (cropWhitespace)
{
using (var bitmap = Decode(path, forceAnalyzeBitmap, out origin))
{
return CropWhiteSpace(bitmap);
}
}
return Decode(path, forceAnalyzeBitmap, out origin);
}
private SKBitmap GetBitmap(string path, bool cropWhitespace, bool autoOrient)
{
SKCodecOrigin origin;
if (autoOrient)
{
var bitmap = GetBitmap(path, cropWhitespace, true, out origin);
if (bitmap != null)
{
if (origin != SKCodecOrigin.TopLeft)
{
using (bitmap)
{
return OrientImage(bitmap, origin);
}
}
}
return bitmap;
}
return GetBitmap(path, cropWhitespace, false, out origin);
}
private SKBitmap OrientImage(SKBitmap bitmap, SKCodecOrigin 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 SKCodecOrigin.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 SKCodecOrigin.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 SKCodecOrigin.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 SKCodecOrigin.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 SKCodecOrigin.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 SKCodecOrigin.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 SKCodecOrigin.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("inputPath");
}
if (string.IsNullOrWhiteSpace(inputPath))
{
throw new ArgumentNullException("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))
{
if (bitmap == null)
{
throw new ArgumentOutOfRangeException(string.Format("Skia unable to read image {0}", inputPath));
}
//_logger.Info("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
var resizeMethod = SKBitmapResizeMethod.Lanczos3;
bitmap.Resize(resizedBitmap, resizeMethod);
// If all we're doing is resizing then we can stop now
if (!hasBackgroundColor && !hasForegroundColor && blur == 0 && !hasIndicator)
{
using (var outputStream = new SKFileWStream(outputPath))
{
resizedBitmap.Encode(outputStream, skiaOutputFormat, quality);
return outputPath;
}
}
// create bitmap to use for canvas drawing
using (var saveBitmap = new SKBitmap(width, height))//, bitmap.ColorType, bitmap.AlphaType))
{
// create canvas used to draw into bitmap
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)
{
using (var paint = new SKPaint())
{
// create image from resized bitmap to apply blur
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)
{
Double opacity;
if (!Double.TryParse(options.ForegroundLayer, out opacity)) opacity = .4;
canvas.DrawColor(new SKColor(0, 0, 0, (Byte)((1 - opacity) * 0xFF)), SKBlendMode.SrcOver);
}
if (hasIndicator)
{
DrawIndicator(canvas, width, height, options);
}
using (var outputStream = new SKFileWStream(outputPath))
{
saveBitmap.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)
{
var task = new PlayedIndicatorDrawer(_appPaths, _httpClientFactory(), _fileSystem).DrawPlayedIndicator(canvas, currentImageSize);
Task.WaitAll(task);
}
else if (options.UnplayedCount.HasValue)
{
new UnplayedCountIndicator(_appPaths, _httpClientFactory(), _fileSystem).DrawUnplayedCountIndicator(canvas, currentImageSize, options.UnplayedCount.Value);
}
if (options.PercentPlayed > 0)
{
new PercentPlayedDrawer().Process(canvas, currentImageSize, options.PercentPlayed);
}
}
catch (Exception ex)
{
_logger.ErrorException("Error drawing indicator overlay", ex);
}
}
public string Name
{
get { return "Skia"; }
}
public bool SupportsImageCollageCreation
{
get { return true; }
}
public bool SupportsImageEncoding
{
get { return true; }
}
}
}