public static bool GenerateThumbnail(Stream Source, string SourceMimeType, out Image Thumbnail)
{
if (Source != null)
{
// GDI+ (jpg, png, gif, bmp)
if (SourceMimeType.Equals("image/jpeg", StringComparison.OrdinalIgnoreCase) || SourceMimeType.Contains("jpg") ||
SourceMimeType.Equals("image/png", StringComparison.OrdinalIgnoreCase) || SourceMimeType.Contains("png") ||
SourceMimeType.Equals("image/gif", StringComparison.OrdinalIgnoreCase) || SourceMimeType.Contains("gif") ||
SourceMimeType.Equals("image/bmp", StringComparison.OrdinalIgnoreCase) || SourceMimeType.Contains("bmp"))
{
try
{
using (Image sourceImage = Image.FromStream(Source))
{
Thumbnail = sourceImage.ResizeImage(48, 48, Brushes.Black);
using (Image mimeTypeIcon = Properties.Resources.MimeType_img16)
{
Thumbnail.EmbedIconOverlay(mimeTypeIcon);
}
return true;
}
}
catch (Exception ex)
{
ex.ToExceptionless().Submit();
}
}
// PDF
if (SourceMimeType.Equals("application/pdf", StringComparison.OrdinalIgnoreCase) || SourceMimeType.Contains("pdf"))
{
try
{
using (var pdfiumDocument = PdfiumViewer.PdfDocument.Load(Source))
{
if (pdfiumDocument.PageCount > 0)
{
var pageSize = pdfiumDocument.PageSizes[0];
var size = ImagingExtensions.CalculateResize((int)pageSize.Width, (int)pageSize.Height, 48, 48);
using (var sourceImage = pdfiumDocument.Render(0, (int)size.Width, (int)size.Height, 72, 72, true))
{
Thumbnail = sourceImage.ResizeImage(48, 48, Brushes.White);
using (Image mimeTypeIcon = Properties.Resources.MimeType_pdf16)
{
Thumbnail.EmbedIconOverlay(mimeTypeIcon);
}
return true;
}
}
}
}
catch (Exception ex)
{
ex.ToExceptionless().Submit();
}
}
}
Thumbnail = null;
return false;
}
