jellyfin/Jellyfin.Drawing.Skia/SkiaHelper.cs
2022-01-04 08:20:16 -07:00

61 lines
1.9 KiB
C#

using System.Collections.Generic;
using SkiaSharp;
namespace Jellyfin.Drawing.Skia
{
/// <summary>
/// Class containing helper methods for working with SkiaSharp.
/// </summary>
public static class SkiaHelper
{
/// <summary>
/// Ensures the result is a success
/// by throwing an exception when that's not the case.
/// </summary>
/// <param name="result">The result returned by Skia.</param>
public static void EnsureSuccess(SKCodecResult result)
{
if (result != SKCodecResult.Success)
{
throw new SkiaCodecException(result);
}
}
/// <summary>
/// Gets the next valid image as a bitmap.
/// </summary>
/// <param name="skiaEncoder">The current skia encoder.</param>
/// <param name="paths">The list of image paths.</param>
/// <param name="currentIndex">The current checked indes.</param>
/// <param name="newIndex">The new index.</param>
/// <returns>A valid bitmap, or null if no bitmap exists after <c>currentIndex</c>.</returns>
public static SKBitmap? GetNextValidImage(SkiaEncoder skiaEncoder, IReadOnlyList<string> paths, int currentIndex, out int newIndex)
{
var imagesTested = new Dictionary<int, int>();
SKBitmap? bitmap = null;
while (imagesTested.Count < paths.Count)
{
if (currentIndex >= paths.Count)
{
currentIndex = 0;
}
bitmap = skiaEncoder.Decode(paths[currentIndex], false, null, out _);
imagesTested[currentIndex] = 0;
currentIndex++;
if (bitmap != null)
{
break;
}
}
newIndex = currentIndex;
return bitmap;
}
}
}