public ImageSize Resize(ImageSize originalSize, ImageSize targetSize)
{
var aspectRatio = (float)originalSize.Width / (float)originalSize.Height;
var width = targetSize.Width;
var height = targetSize.Height;
if (originalSize.Width > targetSize.Width || originalSize.Height > targetSize.Height)
{
if (aspectRatio > 1)
{
height = (int)(targetSize.Height / aspectRatio);
}
else
{
width = (int)(targetSize.Width * aspectRatio);
}
}
else
{
width = originalSize.Width;
height = originalSize.Height;
}
return new ImageSize
{
Width = Math.Max(width, 1),
Height = Math.Max(height, 1)
};
}
public byte[] Create(Stream source, ImageSize desiredSize, string contentType)
{
using (var image = Image.FromStream(source))
{
var originalSize = new ImageSize
{
Height = image.Height,
Width = image.Width
};
var size = resizer.Resize(originalSize, desiredSize);
using (var thumbnail = new Bitmap(size.Width, size.Height))
{
ScaleImage(image, thumbnail);
using (var memoryStream = new MemoryStream())
{
thumbnail.Save(memoryStream, ImageFormats[contentType]);
return memoryStream.ToArray();
}
}
}
}
private FileContentResult CreateThumbnail(string physicalPath)
{
using (var fileStream = System.IO.File.OpenRead(physicalPath))
{
var desiredSize = new ImageSize
{
Width = ThumbnailWidth,
Height = ThumbnailHeight
};
const string contentType = "image/png";
return File(thumbnailCreator.Create(fileStream, desiredSize, contentType), contentType);
}
}