/// <summary>
/// Saves a stream as images of multiple assorted sizes
/// </summary>
/// <param name="stream">The Stream containing the image data to be saved</param>
/// <param name="name">The base image name</param>
/// <param name="sizes">The list of image widths to be created</param>
/// <returns>The URL by which the base file is accessible</returns>
public async Task <string> SaveImageMultipleSizes(Stream stream, string name, List <int> sizes = null, string timeStamp = "")
{
if (timeStamp != "")
{
// Timestamp the filename to prevent collisions
name = GetTimeStampedFileName(name, timeStamp);
}
if (sizes == null)
{
sizes = _imageSizes;
}
List <string> srcSetItems = new List <string>();
// For small images (smaller than largest desired width), remove target sizes that are larger than original image,
// so as not to attempt expanding image.
int imageWidth = new ImageResizer(stream).GetImageWidth();
sizes = GetAdjustedSizeList(sizes, imageWidth);
MemoryStream memoryStream = stream.CloneToMemoryStream();
for (var i = 0; i < sizes.Count; i++)
{
// timeStamped = false, so not to double timestamp
string url = await SaveFile(memoryStream, name, sizes[i]);
srcSetItems.Add(url + " " + sizes[i] + "w");
}
string srcset = string.Join(", ", srcSetItems);
return(srcset);
}
/// <summary>
/// Saves an image stream
/// </summary>
/// <param name="stream">The Stream object containing the image data</param>
/// <param name="name">The name under which to save the images</param>
/// <param name="maxWidth">The maximum width of the image in pixels</param>
/// <returns>The URL by which the file is accessible</returns>
public async Task <string> SaveFile(Stream stream, string name, int?maxWidth, string timeStamp = "")
{
if (timeStamp != "")
{
// Timestamp the filename to prevent collisions
name = GetTimeStampedFileName(name, timeStamp);
}
if (maxWidth != null)
{
ImageResizer imageResizer = new ImageResizer(stream);
int imageWidth = imageResizer.GetImageWidth();
if (imageWidth > maxWidth)
{
Stream resizedStream = imageResizer.GetResizedImageStream((int)(maxWidth));
stream = resizedStream;
imageWidth = (int)(maxWidth);
}
name = GetResizedFileName(name, (int)(imageWidth));
}
// timeStamped = false, so not to double timestamp
return(await base.SaveFile(stream, name));
}
