private (string, NSDictionary) GetImageMetadata(NSDictionary info)
{
string localId = null;
NSDictionary meta = null;
try
{
if (source == UIImagePickerControllerSourceType.Camera)
{
meta = info[UIImagePickerController.MediaMetadata] as NSDictionary;
if (meta != null && meta.ContainsKey(ImageIO.CGImageProperties.Orientation))
{
var newMeta = new NSMutableDictionary();
newMeta.SetValuesForKeysWithDictionary(meta);
var newTiffDict = new NSMutableDictionary();
newTiffDict.SetValuesForKeysWithDictionary(meta[ImageIO.CGImageProperties.TIFFDictionary] as NSDictionary);
newTiffDict.SetValueForKey(meta[ImageIO.CGImageProperties.Orientation], ImageIO.CGImageProperties.TIFFOrientation);
newMeta[ImageIO.CGImageProperties.TIFFDictionary] = newTiffDict;
meta = newMeta;
}
var location = options.Location;
if (meta != null && location != null)
{
meta = SetGpsLocation(meta, location);
}
}
else
{
(meta, localId) = PhotoLibraryAccess.GetPhotoLibraryMetadata(info[UIImagePickerController.ReferenceUrl] as NSUrl);
}
if (options.RotateImage)
{
meta.SetValueForKey((NSNumber)0, ImageIO.CGImageProperties.Orientation);
}
}
catch (Exception ex)
{
Console.WriteLine($"Unable to get metadata: {ex}");
}
return (localId, meta);
}
private async Task <MediaFile> GetPictureMediaFile(NSDictionary info)
{
var image = (UIImage)info[UIImagePickerController.EditedImage] ?? (UIImage)info[UIImagePickerController.OriginalImage];
if (image == null)
{
return(null);
}
var path = GetOutputPath(MediaImplementation.TypeImage,
options.Directory ?? ((IsCaptured) ? string.Empty : "temp"),
options.Name);
var cgImage = image.CGImage;
var percent = 1.0f;
float newHeight = image.CGImage.Height;
float newWidth = image.CGImage.Width;
if (options.PhotoSize != PhotoSize.Full)
{
try
{
switch (options.PhotoSize)
{
case PhotoSize.Large:
percent = .75f;
break;
case PhotoSize.Medium:
percent = .5f;
break;
case PhotoSize.Small:
percent = .25f;
break;
case PhotoSize.Custom:
percent = (float)options.CustomPhotoSize / 100f;
break;
}
if (options.PhotoSize == PhotoSize.MaxWidthHeight && options.MaxWidthHeight.HasValue)
{
var max = Math.Max(image.CGImage.Width, image.CGImage.Height);
if (max > options.MaxWidthHeight.Value)
{
percent = (float)options.MaxWidthHeight.Value / (float)max;
}
}
if (percent < 1.0f)
{
//begin resizing image
image = image.ResizeImageWithAspectRatio(percent);
}
}
catch (Exception ex)
{
Console.WriteLine($"Unable to compress image: {ex}");
}
}
NSDictionary meta = null;
try
{
if (options.SaveMetaData)
{
if (source == UIImagePickerControllerSourceType.Camera)
{
meta = info[UIImagePickerController.MediaMetadata] as NSDictionary;
if (meta != null && meta.ContainsKey(ImageIO.CGImageProperties.Orientation))
{
var newMeta = new NSMutableDictionary();
newMeta.SetValuesForKeysWithDictionary(meta);
var newTiffDict = new NSMutableDictionary();
newTiffDict.SetValuesForKeysWithDictionary(meta[ImageIO.CGImageProperties.TIFFDictionary] as NSDictionary);
newTiffDict.SetValueForKey(meta[ImageIO.CGImageProperties.Orientation], ImageIO.CGImageProperties.TIFFOrientation);
newMeta[ImageIO.CGImageProperties.TIFFDictionary] = newTiffDict;
meta = newMeta;
}
var location = options.Location;
if (meta != null && location != null)
{
meta = SetGpsLocation(meta, location);
}
}
else
{
meta = PhotoLibraryAccess.GetPhotoLibraryMetadata(info[UIImagePickerController.ReferenceUrl] as NSUrl);
}
}
}
catch (Exception ex)
{
Console.WriteLine($"Unable to get metadata: {ex}");
}
//iOS quality is 0.0-1.0
var quality = (options.CompressionQuality / 100f);
var savedImage = false;
if (meta != null)
{
savedImage = SaveImageWithMetadata(image, quality, meta, path);
}
if (!savedImage)
{
var finalQuality = quality;
var imageData = image.AsJPEG(finalQuality);
//continue to move down quality , rare instances
while (imageData == null && finalQuality > 0)
{
finalQuality -= 0.05f;
imageData = image.AsJPEG(finalQuality);
}
if (imageData == null)
{
throw new NullReferenceException("Unable to convert image to jpeg, please ensure file exists or lower quality level");
}
imageData.Save(path, true);
imageData.Dispose();
}
string aPath = null;
if (source != UIImagePickerControllerSourceType.Camera)
{
//try to get the album path's url
var url = (NSUrl)info[UIImagePickerController.ReferenceUrl];
aPath = url?.AbsoluteString;
}
else
{
if (options.SaveToAlbum)
{
try
{
var library = new ALAssetsLibrary();
var albumSave = await library.WriteImageToSavedPhotosAlbumAsync(cgImage, meta);
aPath = albumSave.AbsoluteString;
}
catch (Exception ex)
{
Console.WriteLine("unable to save to album:" + ex);
}
}
}
Func <Stream> getStreamForExternalStorage = () =>
{
if (options.RotateImage)
{
return(RotateImage(image));
}
else
{
return(File.OpenRead(path));
}
};
return(new MediaFile(path, () => File.OpenRead(path), streamGetterForExternalStorage: () => getStreamForExternalStorage(), albumPath: aPath));
}
private async Task <MediaFile> GetPictureMediaFile(NSDictionary info)
{
var image = (UIImage)info[UIImagePickerController.EditedImage] ?? (UIImage)info[UIImagePickerController.OriginalImage];
NSDictionary meta = null;
if (source == UIImagePickerControllerSourceType.Camera)
{
meta = info[UIImagePickerController.MediaMetadata] as NSDictionary;
if (meta != null && meta.ContainsKey(ImageIO.CGImageProperties.Orientation))
{
var newMeta = new NSMutableDictionary();
newMeta.SetValuesForKeysWithDictionary(meta);
var newTiffDict = new NSMutableDictionary();
newTiffDict.SetValuesForKeysWithDictionary(meta[ImageIO.CGImageProperties.TIFFDictionary] as NSDictionary);
newTiffDict.SetValueForKey(meta[ImageIO.CGImageProperties.Orientation], ImageIO.CGImageProperties.TIFFOrientation);
newMeta[ImageIO.CGImageProperties.TIFFDictionary] = newTiffDict;
meta = newMeta;
}
var location = options.Location;
if (meta != null && location.Latitude > 0.0)
{
meta = SetGpsLocation(meta, location);
}
}
else
{
meta = PhotoLibraryAccess.GetPhotoLibraryMetadata(info[UIImagePickerController.ReferenceUrl] as NSUrl);
}
string path = GetOutputPath(MediaImplementation.TypeImage,
options.Directory ?? ((IsCaptured) ? String.Empty : "temp"),
options.Name);
var cgImage = image.CGImage;
if (options.PhotoSize != PhotoSize.Full)
{
try
{
var percent = 1.0f;
switch (options.PhotoSize)
{
case PhotoSize.Large:
percent = .75f;
break;
case PhotoSize.Medium:
percent = .5f;
break;
case PhotoSize.Small:
percent = .25f;
break;
case PhotoSize.Custom:
percent = (float)options.CustomPhotoSize / 100f;
break;
}
if (options.PhotoSize == PhotoSize.MaxWidthHeight && options.MaxWidthHeight.HasValue)
{
var max = Math.Max(image.CGImage.Width, image.CGImage.Height);
if (max > options.MaxWidthHeight)
{
percent = (float)options.MaxWidthHeight / (float)max;
}
}
//calculate new size
var width = (image.CGImage.Width * percent);
var height = (image.CGImage.Height * percent);
//begin resizing image
image = image.ResizeImageWithAspectRatio(width, height);
//update exif pixel dimiensions
meta[ImageIO.CGImageProperties.ExifDictionary].SetValueForKey(new NSString(width.ToString()), ImageIO.CGImageProperties.ExifPixelXDimension);
meta[ImageIO.CGImageProperties.ExifDictionary].SetValueForKey(new NSString(height.ToString()), ImageIO.CGImageProperties.ExifPixelYDimension);
}
catch (Exception ex)
{
Console.WriteLine($"Unable to compress image: {ex}");
}
}
//iOS quality is 0.0-1.0
var quality = (options.CompressionQuality / 100f);
if (meta == null)
{
image.AsJPEG(quality).Save(path, true);
}
else
{
var success = SaveImageWithMetadata(image, quality, meta, path);
if (!success)
{
image.AsJPEG(quality).Save(path, true);
}
}
string aPath = null;
if (source != UIImagePickerControllerSourceType.Camera)
{
//try to get the album path's url
var url = (NSUrl)info[UIImagePickerController.ReferenceUrl];
aPath = url?.AbsoluteString;
}
else
{
if (this.options.SaveToAlbum)
{
try
{
var library = new ALAssetsLibrary();
var albumSave = await library.WriteImageToSavedPhotosAlbumAsync(cgImage, meta);
aPath = albumSave.AbsoluteString;
}
catch (Exception ex)
{
Console.WriteLine("unable to save to album:" + ex);
}
}
}
return(new MediaFile(path, () => File.OpenRead(path), albumPath: aPath));
}
static void ResizeAndCompressImage(StoreCameraMediaOptions options, MediaFile mediaFile, string pathExtension)
{
var image = UIImage.FromFile(mediaFile.Path);
var percent = 1.0f;
if (options.PhotoSize != PhotoSize.Full)
{
try
{
switch (options.PhotoSize)
{
case PhotoSize.Large:
percent = .75f;
break;
case PhotoSize.Medium:
percent = .5f;
break;
case PhotoSize.Small:
percent = .25f;
break;
case PhotoSize.Custom:
percent = (float)options.CustomPhotoSize / 100f;
break;
}
if (options.PhotoSize == PhotoSize.MaxWidthHeight && options.MaxWidthHeight.HasValue)
{
var max = Math.Max(image.Size.Width, image.Size.Height);
if (max > options.MaxWidthHeight.Value)
{
percent = (float)options.MaxWidthHeight.Value / (float)max;
}
}
if (percent < 1.0f)
{
//begin resizing image
image = image.ResizeImageWithAspectRatio(percent);
}
}
catch (Exception ex)
{
Console.WriteLine($"Unable to compress image: {ex}");
}
}
NSDictionary meta = null;
if (options.SaveMetaData)
{
try
{
meta = PhotoLibraryAccess.GetPhotoLibraryMetadata(new NSUrl(mediaFile.AlbumPath));
}
catch (Exception ex)
{
Console.WriteLine($"Unable to get metadata: {ex}");
}
}
//iOS quality is 0.0-1.0
var quality = (options.CompressionQuality / 100f);
var savedImage = false;
if (meta != null)
{
savedImage = MediaPickerDelegate.SaveImageWithMetadata(image, quality, meta, mediaFile.Path, pathExtension);
}
if (!savedImage)
{
if (pathExtension == "png")
{
image.AsPNG().Save(mediaFile.Path, true);
}
else
{
image.AsJPEG(quality).Save(mediaFile.Path, true);
}
}
image?.Dispose();
image = null;
GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
}