public async Task <bool> CompressImage(Stream fileStream, string inputFile, string outputFile)
{
NSError error = await Task.Run(() =>
{
Debug.WriteLine($"Original image file '{inputFile}' (Size: {new FileInfo(inputFile).Length / 1024} KB)");
UIImage img = new UIImage(NSData.FromStream(fileStream));
CGSize imgSize = img.Size;
switch (ImageCompression.DeterminePrimaryScaleDimension(imgSize.Height, imgSize.Width))
{
case ImageCompression.ScaleDown.Height:
imgSize = new CGSize(
ImageCompression.SecondaryTargetSize(imgSize.Height, imgSize.Width),
ImageCompression.MaximumDimension
);
img = img.Scale(imgSize);
break;
case ImageCompression.ScaleDown.Width:
imgSize = new CGSize(
ImageCompression.MaximumDimension,
ImageCompression.SecondaryTargetSize(imgSize.Width, imgSize.Height)
);
img = img.Scale(imgSize);
break;
case ImageCompression.ScaleDown.None:
break;
}
NSData imgData = img.AsJPEG(ImageCompression.CompressionFactorJpegFloat);
imgData.Save(outputFile, NSDataWritingOptions.FileProtectionCompleteUntilFirstUserAuthentication, out error);
Debug.WriteLine($"Wrote compressed image file to '{outputFile}' (Size: {new FileInfo(outputFile).Length / 1024} KB)");
return(error);
}); // TODO: maybe use configure context here
return(error == null);
}
public async Task <bool> CompressImage(Stream fileStream, string inputFile, string outputFile)
{
SDebug.WriteLine($"Original image file '{inputFile}' (Size: {new FileInfo(inputFile).Length / 1024} KB)");
Bitmap img = await BitmapFactory.DecodeStreamAsync(fileStream);
switch (ImageCompression.DeterminePrimaryScaleDimension(img.Height, img.Width))
{
case ImageCompression.ScaleDown.Height:
img = Bitmap.CreateScaledBitmap(
img,
ImageCompression.SecondaryTargetSize(img.Height, img.Width),
ImageCompression.MaximumDimension,
true);
break;
case ImageCompression.ScaleDown.Width:
img = Bitmap.CreateScaledBitmap(
img,
ImageCompression.MaximumDimension,
ImageCompression.SecondaryTargetSize(img.Width, img.Height),
true);
break;
case ImageCompression.ScaleDown.None:
break;
}
FileStream writeStream = new FileStream(path: outputFile,
mode: FileMode.Create,
access: FileAccess.Write,
share: FileShare.None,
bufferSize: 8,
useAsync: true);
bool success = await img.CompressAsync(Bitmap.CompressFormat.Jpeg, ImageCompression.CompressionFactorJpeg, writeStream); // async version available
writeStream.Close();
SDebug.WriteLine($"Wrote compressed image file to '{outputFile}' (Size: {new FileInfo(outputFile).Length / 1024} KB)");
return(success);
}
