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better NConvert decoding

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This commit is contained in:
Paddy Xu
2018-09-02 14:09:01 +03:00
parent e4db93704e
commit 187fe2649b
3 changed files with 12 additions and 5 deletions
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8
QuickLook.Plugin/QuickLook.Plugin.ImageViewer/AnimatedImage/NConvertImageProvider.cs
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@@ -36,6 +36,11 @@ namespace QuickLook.Plugin.ImageViewer.AnimatedImage
public override Task<BitmapSource> GetThumbnail(Size size, Size fullSize)
{
var decodeWidth = (int) Math.Round(fullSize.Width *
Math.Min(size.Width / 2 / fullSize.Width,
size.Height / 2 / fullSize.Height));
var decodeHeight = (int) Math.Round(fullSize.Height / fullSize.Width * decodeWidth);
return new Task<BitmapSource>(() =>
{
try
@@ -46,11 +51,14 @@ namespace QuickLook.Plugin.ImageViewer.AnimatedImage
img.BeginInit();
img.StreamSource = ms;
img.CacheOption = BitmapCacheOption.OnLoad;
img.DecodePixelWidth = decodeWidth;
img.DecodePixelHeight = decodeHeight; // specific size to avoid .net's double to int conversion
img.EndInit();
var scaled = new TransformedBitmap(img,
new ScaleTransform(fullSize.Width / img.PixelWidth, fullSize.Height / img.PixelHeight));
scaled.Freeze();
return scaled;
}
}