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using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using SkiaSharp;
using SkiaSharp.HarfBuzz;
namespace Jellyfin.Drawing.Skia;
/// <summary>
/// Used to build collages of multiple images arranged in vertical strips.
/// </summary>
public partial class StripCollageBuilder
{
private readonly SkiaEncoder _skiaEncoder;
/// <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)
{
_skiaEncoder = skiaEncoder;
}
[GeneratedRegex(@"[^\p{IsCJKUnifiedIdeographs}\p{IsCJKUnifiedIdeographsExtensionA}\p{IsKatakana}\p{IsHiragana}\p{IsHangulSyllables}\p{IsHangulJamo}]")]
private static partial Regex NonCjkPatternRegex();
[GeneratedRegex(@"\p{IsArabic}|\p{IsArmenian}|\p{IsHebrew}|\p{IsSyriac}|\p{IsThaana}")]
private static partial Regex IsRtlTextRegex();
/// <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)
{
ArgumentNullException.ThrowIfNull(outputPath);
var ext = Path.GetExtension(outputPath);
if (string.Equals(ext, ".jpg", StringComparison.OrdinalIgnoreCase)
|| string.Equals(ext, ".jpeg", StringComparison.OrdinalIgnoreCase))
{
return SKEncodedImageFormat.Jpeg;
}
if (string.Equals(ext, ".webp", StringComparison.OrdinalIgnoreCase))
{
return SKEncodedImageFormat.Webp;
}
if (string.Equals(ext, ".gif", StringComparison.OrdinalIgnoreCase))
{
return SKEncodedImageFormat.Gif;
}
if (string.Equals(ext, ".bmp", StringComparison.OrdinalIgnoreCase))
{
return SKEncodedImageFormat.Bmp;
}
// 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>
public void BuildSquareCollage(IReadOnlyList<string> paths, string outputPath, int width, int height)
{
using var bitmap = BuildSquareCollageBitmap(paths, width, height);
using var outputStream = new SKFileWStream(outputPath);
using var pixmap = new SKPixmap(new SKImageInfo(width, height), bitmap.GetPixels());
pixmap.Encode(outputStream, GetEncodedFormat(outputPath), 90);
}
/// <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>
/// <param name="libraryName">The name of the library to draw on the collage.</param>
public void BuildThumbCollage(IReadOnlyList<string> paths, string outputPath, int width, int height, string? libraryName)
{
using var bitmap = BuildThumbCollageBitmap(paths, width, height, libraryName);
using var outputStream = new SKFileWStream(outputPath);
using var pixmap = new SKPixmap(new SKImageInfo(width, height), bitmap.GetPixels());
pixmap.Encode(outputStream, GetEncodedFormat(outputPath), 90);
}
private SKBitmap BuildThumbCollageBitmap(IReadOnlyList<string> paths, int width, int height, string? libraryName)
{
var bitmap = new SKBitmap(width, height);
using var canvas = new SKCanvas(bitmap);
canvas.Clear(SKColors.Black);
using var backdrop = SkiaHelper.GetNextValidImage(_skiaEncoder, paths, 0, out _);
if (backdrop is null)
{
return bitmap;
}
// resize to the same aspect as the original
var backdropHeight = Math.Abs(width * backdrop.Height / backdrop.Width);
using var residedBackdrop = SkiaEncoder.ResizeImage(backdrop, new SKImageInfo(width, backdropHeight, backdrop.ColorType, backdrop.AlphaType, backdrop.ColorSpace));
// draw the backdrop
canvas.DrawImage(residedBackdrop, 0, 0);
// draw shadow rectangle
using var paintColor = new SKPaint
{
Color = SKColors.Black.WithAlpha(0x78),
Style = SKPaintStyle.Fill
};
canvas.DrawRect(0, 0, width, height, paintColor);
var typeFace = SKTypeface.FromFamilyName("sans-serif", SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright);
// use the system fallback to find a typeface for the given CJK character
var filteredName = NonCjkPatternRegex().Replace(libraryName ?? string.Empty, string.Empty);
if (!string.IsNullOrEmpty(filteredName))
{
typeFace = SKFontManager.Default.MatchCharacter(null, SKFontStyleWeight.Bold, SKFontStyleWidth.Normal, SKFontStyleSlant.Upright, null, filteredName[0]);
}
// draw library name
using var textPaint = new SKPaint
{
Color = SKColors.White,
Style = SKPaintStyle.Fill,
TextSize = 112,
TextAlign = SKTextAlign.Center,
Typeface = typeFace,
IsAntialias = true
};
// scale down text to 90% of the width if text is larger than 95% of the width
var textWidth = textPaint.MeasureText(libraryName);
if (textWidth > width * 0.95)
{
textPaint.TextSize = 0.9f * width * textPaint.TextSize / textWidth;
}
if (string.IsNullOrWhiteSpace(libraryName))
{
return bitmap;
}
if (IsRtlTextRegex().IsMatch(libraryName))
{
canvas.DrawShapedText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
}
else
{
canvas.DrawText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
}
return bitmap;
}
private SKBitmap BuildSquareCollageBitmap(IReadOnlyList<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 = SkiaHelper.GetNextValidImage(_skiaEncoder, paths, imageIndex, out int newIndex);
imageIndex = newIndex;
if (currentBitmap is null)
{
continue;
}
// Scale image. The FromBitmap creates a copy
var imageInfo = new SKImageInfo(cellWidth, cellHeight, currentBitmap.ColorType, currentBitmap.AlphaType, currentBitmap.ColorSpace);
using var resizeImage = SkiaEncoder.ResizeImage(currentBitmap, imageInfo);
// draw this image into the strip at the next position
var xPos = x * cellWidth;
var yPos = y * cellHeight;
canvas.DrawImage(resizeImage, xPos, yPos);
}
}
return bitmap;
}
}
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