public static Stream Resize(int width, int height, Stream image, string fileName)
{
Stream fileStream = new MemoryStream();
Image tempImage = Bitmap.FromStream(image);
long maxFactor = width * height;
long imageFactor = tempImage.Width * tempImage.Height;
if (maxFactor < imageFactor)
{
using (ImageResizer resizer = new ImageResizer())
{
resizer.MimeType = Path.GetExtension(fileName);
resizer.SourceImage = tempImage;
resizer.Background = ColorTranslator.FromHtml("#fff");
resizer.Mode = ImageResizer.ResizeMode.KeepOriginalAspect;
resizer.Width = width;
resizer.Height = height;
resizer.Process();
resizer.ResultImage.Save(fileStream, tempImage.RawFormat);
}
}
else
{
image.Seek(0, SeekOrigin.Begin);
image.CopyTo(fileStream);
}
return(fileStream);
}
private void StartAsyncTask(Object workItemState)
{
try
{
string location = _context.Request.QueryString["image"];
if (location == null)
{
//throw new HttpException("Invalid request.");
return;
}
string extension;
string contentType;
try
{
extension = Path.GetExtension(location).ToLower();
}
catch
{
throw new HttpException("Invalid request: " + location);
}
switch (extension)
{
case ".jpg":
contentType = "image/jpeg";
break;
case ".jpeg":
contentType = "image/jpeg";
break;
case ".png":
contentType = "image/png";
break;
case ".gif":
contentType = "image/gif";
break;
case ".bmp":
contentType = "image/bmp";
break;
default:
throw new HttpException(404, "Invalid request: " + location);
}
string absoluteLocation = _context.Server.MapPath("~/" + location);
var ecommerceService = (IECommerce)DependencyResolver.Current.GetService(typeof(IECommerce));
//var config = ImageProviderWebSectionGroup.FromCurrentConfiguration().ImageProvider;
//if (config.Presets.Count == 0)
// throw new ConfigurationErrorsException("No resize presets defined.");
//ImageProviderPresetElement preset;
var preset = new tbl_ProdImageVerNames();
if (_context.Request["preset"] != null)
{
preset = ecommerceService.GetProductImageVersionByName(_context.Request.QueryString["preset"]);
if (preset == null)
{
throw new ArgumentException("The specified preset name is not valid.", "preset");
}
}
_context.Response.Cache.SetCacheability(HttpCacheability.Public);
_context.Response.Cache.SetExpires(DateTime.Now.AddDays(3));
if (preset.VN_Width == 0 && preset.VN_Width == 0 && File.Exists(absoluteLocation))
{
_context.Response.ContentType = contentType;
using (FileStream f = File.OpenRead(absoluteLocation))
{
f.Write(_context.Response.OutputStream, 65536);
}
return;
}
string absoluteCacheDirectoryLocation =
_context.Server.MapPath(String.IsNullOrWhiteSpace(preset.VN_Path)
? "/Images/Versions"
: preset.VN_Path.TrimEnd('/'));
string absoluteCacheFileLocation = new StringBuilder()
.Append(absoluteCacheDirectoryLocation).Append(Path.DirectorySeparatorChar)
.Append(preset.VN_Width).Append("x").Append(preset.VN_Height)
.Append("_")
.Append(
(ImageResizer.ResizeMode)
Enum.Parse(typeof(ImageResizer.ResizeMode),
preset.VN_Mode.GetValueOrDefault(
(int)ImageResizer.ResizeMode.CropToDestinationAspect).ToString(CultureInfo.InvariantCulture)))
.Append("_").Append(Path.GetFileName(location)).ToString();
if (File.Exists(absoluteCacheFileLocation))
{
_context.Response.ContentType = contentType;
using (FileStream f = File.OpenRead(absoluteCacheFileLocation))
{
f.Write(_context.Response.OutputStream, 65536);
}
return;
}
if (File.Exists(absoluteLocation))
{
using (var resizer = new ImageResizer(absoluteLocation))
{
resizer.Background = String.IsNullOrEmpty(preset.VN_Background)
? ColorTranslator.FromHtml("#FFF")
: ColorTranslator.FromHtml(preset.VN_Background);
resizer.Mode = preset.VN_Mode.HasValue
? (ImageResizer.ResizeMode)
Enum.Parse(typeof(ImageResizer.ResizeMode), preset.VN_Mode.Value.ToString(CultureInfo.InvariantCulture))
: ImageResizer.ResizeMode.CropToDestinationAspect;
resizer.Width = preset.VN_Width;
resizer.Height = preset.VN_Height;
resizer.Process();
_context.Response.ContentType = contentType;
if (!Directory.Exists(absoluteCacheDirectoryLocation))
{
Directory.CreateDirectory(absoluteCacheDirectoryLocation);
}
using (var output = new MemoryStream())
{
resizer.SaveAs(output);
output.WriteTo(_context.Response.OutputStream);
}
resizer.SaveAs(absoluteCacheFileLocation);
}
}
}
catch (Exception e)
{
Log.Error(e.Message);
}
finally
{
_completed = true;
_callback(this);
}
}