jellyfin-server/Jellyfin.Drawing.Skia/StripCollageBuilder.cs

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C#
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using System;
using System.Collections.Generic;
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using System.IO;
using SkiaSharp;
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namespace Jellyfin.Drawing.Skia
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{
/// <summary>
/// Used to build collages of multiple images arranged in vertical strips.
/// </summary>
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public class StripCollageBuilder
{
private readonly SkiaEncoder _skiaEncoder;
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/// <summary>
/// Initializes a new instance of the <see cref="StripCollageBuilder"/> class.
/// </summary>
/// <param name="skiaEncoder">The encoder to use for building collages.</param>
public StripCollageBuilder(SkiaEncoder skiaEncoder)
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{
_skiaEncoder = skiaEncoder;
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}
/// <summary>
/// Check which format an image has been encoded with using its filename extension.
/// </summary>
/// <param name="outputPath">The path to the image to get the format for.</param>
/// <returns>The image format.</returns>
public static SKEncodedImageFormat GetEncodedFormat(string outputPath)
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{
if (outputPath == null)
{
throw new ArgumentNullException(nameof(outputPath));
}
var ext = Path.GetExtension(outputPath);
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if (string.Equals(ext, ".jpg", StringComparison.OrdinalIgnoreCase)
|| string.Equals(ext, ".jpeg", StringComparison.OrdinalIgnoreCase))
{
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return SKEncodedImageFormat.Jpeg;
}
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if (string.Equals(ext, ".webp", StringComparison.OrdinalIgnoreCase))
{
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return SKEncodedImageFormat.Webp;
}
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if (string.Equals(ext, ".gif", StringComparison.OrdinalIgnoreCase))
{
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return SKEncodedImageFormat.Gif;
}
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if (string.Equals(ext, ".bmp", StringComparison.OrdinalIgnoreCase))
{
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return SKEncodedImageFormat.Bmp;
}
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// default to png
return SKEncodedImageFormat.Png;
}
/// <summary>
/// Create a square collage.
/// </summary>
/// <param name="paths">The paths of the images to use in the collage.</param>
/// <param name="outputPath">The path at which to place the resulting collage image.</param>
/// <param name="width">The desired width of the collage.</param>
/// <param name="height">The desired height of the collage.</param>
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public void BuildSquareCollage(string[] paths, string outputPath, int width, int height)
{
using (var bitmap = BuildSquareCollageBitmap(paths, width, height))
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using (var outputStream = new SKFileWStream(outputPath))
using (var pixmap = new SKPixmap(new SKImageInfo(width, height), bitmap.GetPixels()))
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{
pixmap.Encode(outputStream, GetEncodedFormat(outputPath), 90);
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}
}
/// <summary>
/// Create a thumb collage.
/// </summary>
/// <param name="paths">The paths of the images to use in the collage.</param>
/// <param name="outputPath">The path at which to place the resulting image.</param>
/// <param name="width">The desired width of the collage.</param>
/// <param name="height">The desired height of the collage.</param>
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public void BuildThumbCollage(string[] paths, string outputPath, int width, int height)
{
using (var bitmap = BuildThumbCollageBitmap(paths, width, height))
using (var outputStream = new SKFileWStream(outputPath))
using (var pixmap = new SKPixmap(new SKImageInfo(width, height), bitmap.GetPixels()))
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{
pixmap.Encode(outputStream, GetEncodedFormat(outputPath), 90);
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}
}
private SKBitmap BuildThumbCollageBitmap(string[] paths, int width, int height)
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{
var bitmap = new SKBitmap(width, height);
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using (var canvas = new SKCanvas(bitmap))
{
canvas.Clear(SKColors.Black);
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// number of images used in the thumbnail
var iCount = 3;
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// determine sizes for each image that will composited into the final image
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var iSlice = Convert.ToInt32(width / iCount);
int iHeight = Convert.ToInt32(height * 1.00);
int imageIndex = 0;
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for (int i = 0; i < iCount; i++)
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{
using (var currentBitmap = GetNextValidImage(paths, imageIndex, out int newIndex))
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{
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imageIndex = newIndex;
if (currentBitmap == null)
{
continue;
}
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// resize to the same aspect as the original
int iWidth = (int)Math.Abs(iHeight * currentBitmap.Width / currentBitmap.Height);
using (var resizeBitmap = new SKBitmap(iWidth, iHeight, currentBitmap.ColorType, currentBitmap.AlphaType))
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{
currentBitmap.ScalePixels(resizeBitmap, SKFilterQuality.High);
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// crop image
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int ix = (int)Math.Abs((iWidth - iSlice) / 2);
using (var image = SKImage.FromBitmap(resizeBitmap))
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using (var subset = image.Subset(SKRectI.Create(ix, 0, iSlice, iHeight)))
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{
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// draw image onto canvas
canvas.DrawImage(subset ?? image, iSlice * i, 0);
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}
}
}
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}
}
return bitmap;
}
private SKBitmap GetNextValidImage(string[] paths, int currentIndex, out int newIndex)
{
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var imagesTested = new Dictionary<int, int>();
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SKBitmap bitmap = null;
while (imagesTested.Count < paths.Length)
{
if (currentIndex >= paths.Length)
{
currentIndex = 0;
}
bitmap = _skiaEncoder.Decode(paths[currentIndex], false, null, out var origin);
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imagesTested[currentIndex] = 0;
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currentIndex++;
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if (bitmap != null)
{
break;
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}
}
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newIndex = currentIndex;
return bitmap;
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}
private SKBitmap BuildSquareCollageBitmap(string[] paths, int width, int height)
{
var bitmap = new SKBitmap(width, height);
var imageIndex = 0;
var cellWidth = width / 2;
var cellHeight = height / 2;
using (var canvas = new SKCanvas(bitmap))
{
for (var x = 0; x < 2; x++)
{
for (var y = 0; y < 2; y++)
{
using (var currentBitmap = GetNextValidImage(paths, imageIndex, out int newIndex))
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{
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imageIndex = newIndex;
if (currentBitmap == null)
{
continue;
}
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using (var resizedBitmap = new SKBitmap(cellWidth, cellHeight, currentBitmap.ColorType, currentBitmap.AlphaType))
{
// scale image
currentBitmap.ScalePixels(resizedBitmap, SKFilterQuality.High);
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// draw this image into the strip at the next position
var xPos = x * cellWidth;
var yPos = y * cellHeight;
canvas.DrawBitmap(resizedBitmap, xPos, yPos);
}
}
}
}
}
return bitmap;
}
}
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}