private void GenerateSlideThumbnails(ICollection <Slide> slides)
{
Directory.CreateDirectory(AppDirectories.SlideThumbs);
var existingThumbs = from file in Directory.EnumerateFiles(AppDirectories.SlideThumbs, "*.jpeg")
select file;
var existingThumbsCount = existingThumbs.Count();
if (slides.Count == existingThumbsCount)
{
return;
}
foreach (var slide in slides)
{
var existingSlideThumb = from file in existingThumbs
where file.ToLower().Contains($"{slide.Name.ToUrlSlug()}")
select file;
if (existingSlideThumb.Any())
{
continue;
}
logger.LogInformation("Generating thumbnail of slide {id}: {name}..", slide.Id, slide.Name);
using (var osr = new OpenSlide(slide.FilePath))
{
var thumb = osr.GetThumbnail(new Size(400, 400));
thumb.Save($@"{AppDirectories.SlideThumbs}{slide.Name.ToUrlSlug()}.jpeg", ImageFormat.Jpeg);
}
}
}
public void TestThumbnail()
{
Assert.AreEqual(new Size(100, 83), osr.GetThumbnail(new SizeL(100, 100)).Size);
}