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Pick blurhash sizes depending on image aspect ratio

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This commit is contained in:
Vasily 2020-05-26 02:31:40 +03:00
parent 0f32b0ffad
commit f575415e0b
1 changed files with 10 additions and 4 deletions
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14
Jellyfin.Drawing.Skia/SkiaEncoder.cs
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@ -241,14 +241,20 @@ namespace Jellyfin.Drawing.Skia
throw new ArgumentNullException(nameof(path)); throw new ArgumentNullException(nameof(path));
} }
if (!File.Exists(path)) var dims = GetImageSize(path);
if (dims.Width <= 0 || dims.Height <= 0)
{ {
throw new FileNotFoundException("File not found", path); // empty image does not have any blurhash
return string.Empty;
} }
// Use 4 vertical and 4 horizontal components of DCT of the image. // We want tiles to be as close to square as possible, and to *mostly* keep under 16 tiles for performance.
// One tile is (width / xComp) x (height / yComp) pixels, which means that ideally yComp = xComp * height / width.
// See more at https://github.com/woltapp/blurhash/#how-do-i-pick-the-number-of-x-and-y-components // See more at https://github.com/woltapp/blurhash/#how-do-i-pick-the-number-of-x-and-y-components
return BlurHashEncoder.Encode(4, 4, path); float xComp = MathF.Sqrt(16.0f * dims.Width / dims.Height);
float yComp = xComp * dims.Height / dims.Width;
return BlurHashEncoder.Encode(Math.Min((int)xComp + 1, 9), Math.Min((int)yComp + 1, 9), path);
} }
private static bool HasDiacritics(string text) private static bool HasDiacritics(string text)