public static Stream ResizeImage(this string imagePath, ImageResizeRequestModel resizeParameters)
{
if (imagePath == null) throw new ArgumentNullException("imagePath");
if (resizeParameters == null) throw new ArgumentNullException("resizeParameters");
using (var image = Image.FromFile(imagePath))
{
return image.ResizeImage(resizeParameters);
}
}
public static Stream ResizeImage(this byte[] imageContent, ImageResizeRequestModel resizeParameters)
{
if (imageContent == null) throw new ArgumentNullException("imageContent");
if (resizeParameters == null) throw new ArgumentNullException("resizeParameters");
Stream stream = new MemoryStream(imageContent);
using (var image = Image.FromStream(stream))
{
return image.ResizeImage(resizeParameters);
}
}
private static Stream ResizeImage(this Image image, ImageResizeRequestModel resizeParameters)
{
if (image == null) throw new ArgumentNullException("image");
if (resizeParameters == null) throw new ArgumentNullException("resizeParameters");
Stream stream;
if (resizeParameters.MaxHeight.HasValue ||
resizeParameters.MaxWidth.HasValue ||
resizeParameters.MaxSide.HasValue)
{
var targetSize = resizeParameters.GetTargetSize(new Size(image.Width, image.Height));
var quality = resizeParameters.GetQuality();
if (quality == ImageResizeQuality.High)
{
using (var thumbnailBitmap = new Bitmap(targetSize.Width, targetSize.Height))
{
thumbnailBitmap.SetResolution(72.0f, 72.0f);
using (var thumbnailGraph = Graphics.FromImage(thumbnailBitmap))
{
thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, targetSize.Width, targetSize.Height);
thumbnailGraph.DrawImage(image, imageRectangle);
stream = new MemoryStream();
thumbnailBitmap.Save(stream, image.RawFormat);
}
}
}
else
{
var abort = new Image.GetThumbnailImageAbort(() => false);
using (var thumbnailImage = image.GetThumbnailImage(
targetSize.Width, targetSize.Height, abort, IntPtr.Zero))
{
stream = new MemoryStream();
thumbnailImage.Save(stream, image.RawFormat);
}
}
}
else
{
stream = new MemoryStream();
image.Save(stream, image.RawFormat);
}
stream.Position = 0;
return stream;
}