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housecor on 10/31/10

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Resize uploaded image on the fly

/ Published in: C#

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/// <summary>
		/// Save posted data to the db
		/// </summary>
		public void Save(object sender, EventArgs e)
		{
			if (!Page.IsValid) return;

if (Request["ID"] != null) //so editing news
			{
				teamMember = GetTeamMember();
			}

FileUpload fileUpload = ((FileUpload)Page.Master.FindControl("ContentPlaceHolder1").FindControl("fuPhoto"));
			if (fileUpload.HasFile)
			{
				//resize uploaded photo and save
				using (Bitmap img = ResizeImage(new Bitmap(fuPhoto.PostedFile.InputStream), MemberPhotoWidth, MemberPhotoHeight, FileResizeOptions.MaxWidthAndHeight))
				{
					var filename = System.IO.Path.GetFileName(fileUpload.PostedFile.FileName);
					var destination = Path.Combine(System.Configuration.ConfigurationManager.AppSettings["TeamMemberPhotosPath"], filename);

switch (Path.GetExtension(fuPhoto.FileName).ToLower())
					{
						case ".png":
							img.Save(destination, System.Drawing.Imaging.ImageFormat.Png);
							break;
						default:
							img.Save(destination, System.Drawing.Imaging.ImageFormat.Jpeg);
							break;
					}
				}
			}

teamMember.Name = txtName.Text;
			teamMember.Bio = txtBio.Text;
			teamMember.Modified = DateTime.Now;
			teamMember.Status = ddStatus.SelectedValue;
			teamMember.Photo = fuPhoto.FileName;

if (Request["ID"] == null) //so adding
			{
				db.TeamMembers.InsertOnSubmit(teamMember);
			}

db.SubmitChanges();

Notification n = new Notification("Save Complete.", ScreenMessageType.Confirmation);
			Response.Redirect("/Admin/Team", true);
		}

/// <summary>
		/// Do the actual resize of the image
		/// </summary>
		/// <param name="originalImg"></param>
		/// <param name="widthInPixels"></param>
		/// <param name="heightInPixels"></param>
		/// <returns></returns>
		public static Bitmap DoResize(Bitmap originalImg, int widthInPixels, int heightInPixels)
		{
			Bitmap bitmap;
			try
			{
				bitmap = new Bitmap(widthInPixels, heightInPixels);
				using (Graphics graphic = Graphics.FromImage(bitmap))
				{
					// Quality properties
					graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
					graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
					graphic.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
					graphic.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

graphic.DrawImage(originalImg, 0, 0, widthInPixels, heightInPixels);
					return bitmap;
				}
			}
			finally
			{
				if (originalImg != null)
				{
					originalImg.Dispose();
				}
			}
		}

/// <summary>
		/// Determine how the image will be resized.
		/// </summary>
		/// <param name="image"></param>
		/// <param name="width"></param>
		/// <param name="height"></param>
		/// <param name="resizeOptions"></param>
		/// <returns></returns>
		public static Bitmap ResizeImage(Bitmap image, int width, int height, FileResizeOptions resizeOptions)
		{
			float f_width;
			float f_height;
			float dim;
			switch (resizeOptions)
			{
				case FileResizeOptions.ExactWidthAndHeight:
					return DoResize(image, width, height);

case FileResizeOptions.MaxHeight:
					f_width = image.Width;
					f_height = image.Height;

if (f_height <= height)
						return DoResize(image, (int)f_width, (int)f_height);

dim = f_width / f_height;
					width = (int)((float)(height) * dim);
					return DoResize(image, width, height);

case FileResizeOptions.MaxWidth:
					f_width = image.Width;
					f_height = image.Height;

if (f_width <= width)
						return DoResize(image, (int)f_width, (int)f_height);

dim = f_width / f_height;
					height = (int)((float)(width) / dim);
					return DoResize(image, width, height);

case FileResizeOptions.MaxWidthAndHeight:
					int tmpHeight = height;
					int tmpWidth = width;
					f_width = image.Width;
					f_height = image.Height;

if (f_width <= width && f_height <= height)
						return DoResize(image, (int)f_width, (int)f_height);

dim = f_width / f_height;

// Check if the width is ok
					if (f_width < width)
						width = (int)f_width;
					height = (int)((float)(width) / dim);
					// The width is too width
					if (height > tmpHeight)
					{
						if (f_height < tmpHeight)
							height = (int)f_height;
						else
							height = tmpHeight;
						width = (int)((float)(height) * dim);
					}
					return DoResize(image, width, height);
				default:
					return image;
			}
		}
	}

URL: http://mironabramson.com/blog/post/2007/10/Resize-images-\\\\\\\\\\\\\\\'on-the-fly\\\\\\\\\\\\\\\'-while-uploading.aspx

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