/// <summary>
/// Uploads image by resizing and storing it.
/// </summary>
/// <param name="source"></param>
/// <param name="resizes"></param>
/// <param name="fileName">Unique filename.</param>
/// <param name="contentType"></param>
/// <param name="uploadedOn"></param>
/// <param name="appType"></param>
/// <param name="userId"></param>
/// <param name="uploadFrom"></param>
/// <returns></returns>
public async Task <Media> UploadImageAsync(Stream source,
List <ImageResizeInfo> resizes,
string fileName,
string contentType,
string title,
DateTimeOffset uploadedOn,
EAppType appType,
int userId,
EUploadedFrom uploadFrom = EUploadedFrom.Browser)
{
int resizeCount = 0;
var(widthOrig, heightOrig) = GetOriginalSize(source);
foreach (var resize in resizes)
{
using (var dest = new MemoryStream())
{
// each time source is read, it needs reset
source.Position = 0;
// don't resize original png and gif may output large file size, save it as is
if (resize.TargetSize == int.MaxValue)
{
await _storageProvider.SaveFileAsync(source, fileName, resize.Path, resize.PathSeparator);
}
else if (Math.Max(widthOrig, heightOrig) > resize.TargetSize) // only resize and save when it's larger than target
{
resizeCount++;
Resize(source, dest, resize.TargetSize);
dest.Position = 0;
await _storageProvider.SaveFileAsync(dest, fileName, resize.Path, resize.PathSeparator);
}
}
}
// if already exists return it
var media = await _mediaRepo.GetAsync(fileName, uploadedOn.Year, uploadedOn.Month);
if (media != null)
{
return(media);
}
// create record in db
media = new Media
{
UserId = userId,
AppType = appType,
FileName = fileName,
Title = title,
Description = null,
Length = source.Length,
MediaType = EMediaType.Image,
UploadedOn = uploadedOn,
UploadedFrom = uploadFrom,
Width = widthOrig,
Height = heightOrig,
Caption = title,
ContentType = contentType,
Alt = title,
ResizeCount = resizeCount,
};
await _mediaRepo.CreateAsync(media);
return(media);
}
/// <summary>
/// Uploads image by resizing and storing it.
/// </summary>
/// <param name="source"></param>
/// <param name="resizes"></param>
/// <param name="fileName"></param>
/// <param name="contentType"></param>
/// <param name="uploadedOn"></param>
/// <param name="appType"></param>
/// <param name="userId"></param>
/// <param name="uploadFrom"></param>
/// <returns></returns>
public async Task <Media> UploadImageAsync(Stream source,
List <ImageResizeInfo> resizes,
string fileName,
string contentType,
string title,
DateTimeOffset uploadedOn,
EAppType appType,
int userId,
EUploadedFrom uploadFrom = EUploadedFrom.Browser)
{
int widthOrig;
int heightOrig;
int resizeCount = 0;
if (contentType.Equals("image/gif"))
{
using (var imageColl = new MagickImageCollection(source))
{
widthOrig = imageColl[0].Width;
heightOrig = imageColl[0].Height;
// resize and store
foreach (var resize in resizes)
{
// save original without resizing, currently I couldn't dec original file size by resizing with ImageMagick
if (resize.TargetSize == int.MaxValue)
{
source.Position = 0;
await _storageProvider.SaveFileAsync(source, fileName, resize.Path, resize.PathSeparator);
}
else if (Math.Max(widthOrig, heightOrig) > resize.TargetSize)
{
resizeCount++;
var(width, height) = GetNewSize(widthOrig, heightOrig, resize.TargetSize);
imageColl.Coalesce();
foreach (var image in imageColl)
{
var colors = image.TotalColors;
image.Resize(width, height); // resize will make # of colors higher
image.Quantize(new QuantizeSettings
{
Colors = colors, // set it back to the smaller original colors
DitherMethod = DitherMethod.No
});
}
imageColl.Optimize();
await _storageProvider.SaveFileAsync(imageColl.ToByteArray(), fileName, resize.Path, resize.PathSeparator);
}
}
}
}
else if (contentType.Equals("image/png"))
{
using (var image = new MagickImage(source))
{
widthOrig = image.Width;
heightOrig = image.Height;
foreach (var resize in resizes)
{
// save original without resizing for png
if (resize.TargetSize == int.MaxValue)
{
source.Position = 0;
await _storageProvider.SaveFileAsync(source, fileName, resize.Path, resize.PathSeparator);
}
else if (Math.Max(widthOrig, heightOrig) > resize.TargetSize)
{
resizeCount++;
var(width, height) = GetNewSize(widthOrig, heightOrig, resize.TargetSize);
//image.Quality = 75; // does not seem to affect output file size, so commented out
image.Resize(width, height);
await _storageProvider.SaveFileAsync(image.ToByteArray(), fileName, resize.Path, resize.PathSeparator);
}
}
}
}
else // jpg
{
using (var image = new MagickImage(source))
{
widthOrig = image.Width;
heightOrig = image.Height;
foreach (var resize in resizes)
{
if (resize.TargetSize == int.MaxValue || Math.Max(widthOrig, heightOrig) > resize.TargetSize)
{
if (resize.TargetSize != int.MaxValue)
{
resizeCount++;
}
var(width, height) = GetNewSize(widthOrig, heightOrig, resize.TargetSize);
// setting the Quality is needed for having it here makes a difference for a smaller output file size!
image.Quality = 85; // 75 is default
image.Resize(width, height);
await _storageProvider.SaveFileAsync(image.ToByteArray(), fileName, resize.Path, resize.PathSeparator);
}
}
}
}
// create record in db
var media = new Media
{
UserId = userId,
AppType = appType,
FileName = fileName,
Title = title,
Description = null,
Length = source.Length,
MediaType = EMediaType.Image,
UploadedOn = uploadedOn,
UploadedFrom = uploadFrom,
Width = widthOrig,
Height = heightOrig,
Caption = title,
ContentType = contentType,
Alt = title,
ResizeCount = resizeCount,
};
await _mediaRepo.CreateAsync(media);
return(media);
}