async Task StoreResizedImage(ImageStoreSaveOptions options, CloudBlockBlob blobReference)
{
using (var src = Image.FromStream(options.InputStream)) {
var largestDimension = src.Width > src.Height ? src.Width : src.Height;
var ratio = 1D * options.MaxDimension / largestDimension;
var destinationWidth = Convert.ToInt32(src.Width * ratio);
var destinationHeight = Convert.ToInt32(src.Height * ratio);
using (var targetImage = new Bitmap(destinationWidth, destinationHeight)) {
using (var g = Graphics.FromImage(targetImage)) {
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(src, 0, 0, targetImage.Width, targetImage.Height);
}
using (var memoryStream = new MemoryStream()) {
targetImage.Save(memoryStream, ImageFormat.Png);
memoryStream.Position = 0;
await blobReference.UploadFromStreamAsync(memoryStream);
}
}
}
}
public async Task <string> Save(ImageStoreSaveOptions options)
{
var container = CloudBlobClient.GetContainerReference(options.ContainerName);
if (await container.CreateIfNotExistsAsync())
{
await container.SetPermissionsAsync(new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob });
}
var blobReference = container.GetBlockBlobReference(options.FileName);
var exists = await blobReference.ExistsAsync();
var expired = false;
if (exists)
{
var lastModified = blobReference.Properties.LastModified ?? DateTime.Now;
expired = lastModified < DateTime.Now.AddDays(-14);
}
if (!exists || options.Overwrite || expired)
{
blobReference.Properties.ContentType = options.ContentType;
if (options.MaxDimension > 0)
{
await StoreResizedImage(options, blobReference);
}
else
{
options.InputStream.Position = 0;
await blobReference.UploadFromStreamAsync(options.InputStream);
}
}
return(blobReference.Uri.AbsoluteUri);
}