/// <summary>
/// Rotates the image at the specified file path.
/// </summary>
/// <param name="filePath">The file path to the image.</param>
/// <param name="rotation">The rotation direction.</param>
/// <remarks>
/// https://docs.microsoft.com/en-us/uwp/api/windows.graphics.imaging.bitmapdecoder?view=winrt-22000
/// https://docs.microsoft.com/en-us/uwp/api/windows.graphics.imaging.bitmapencoder?view=winrt-22000
/// </remarks>
public static async Task Rotate(string filePath, BitmapRotation rotation)
{
if (string.IsNullOrEmpty(filePath))
{
return;
}
var file = await StorageHelpers.ToStorageItem <IStorageFile>(filePath);
if (file == null)
{
return;
}
using IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.ReadWrite);
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(fileStream);
using var memStream = new InMemoryRandomAccessStream();
BitmapEncoder encoder = await BitmapEncoder.CreateForTranscodingAsync(memStream, decoder);
encoder.BitmapTransform.Rotation = rotation;
await encoder.FlushAsync();
memStream.Seek(0);
fileStream.Seek(0);
fileStream.Size = 0;
await RandomAccessStream.CopyAsync(memStream, fileStream);
}
public static async Task <byte[]> LoadIconFromPathAsync(string filePath, uint thumbnailSize, ThumbnailMode thumbnailMode)
{
if (!filePath.EndsWith(".lnk", StringComparison.Ordinal) && !filePath.EndsWith(".url", StringComparison.Ordinal))
{
var item = await StorageHelpers.ToStorageItem <IStorageItem>(filePath);
if (item != null)
{
var iconData = await LoadIconFromStorageItemAsync(item, thumbnailSize, thumbnailMode);
if (iconData != null)
{
return(iconData);
}
}
}
return(await LoadIconWithoutOverlayAsync(filePath, thumbnailSize));
}
public static async void SetAsBackground(WallpaperType type, string filePath, IShellPage associatedInstance)
{
if (UserProfilePersonalizationSettings.IsSupported())
{
// Get the path of the selected file
BaseStorageFile sourceFile = await StorageHelpers.ToStorageItem <BaseStorageFile>(filePath, associatedInstance);
if (sourceFile == null)
{
return;
}
// Get the app's local folder to use as the destination folder.
BaseStorageFolder localFolder = ApplicationData.Current.LocalFolder;
// the file to the destination folder.
// Generate unique name if the file already exists.
// If the file you are trying to set as the wallpaper has the same name as the current wallpaper,
// the system will ignore the request and no-op the operation
BaseStorageFile file = await FilesystemTasks.Wrap(() => sourceFile.CopyAsync(localFolder, sourceFile.Name, NameCollisionOption.GenerateUniqueName).AsTask());
if (file == null)
{
return;
}
UserProfilePersonalizationSettings profileSettings = UserProfilePersonalizationSettings.Current;
if (type == WallpaperType.Desktop)
{
// Set the desktop background
await profileSettings.TrySetWallpaperImageAsync(await file.ToStorageFileAsync());
}
else if (type == WallpaperType.LockScreen)
{
// Set the lockscreen background
await profileSettings.TrySetLockScreenImageAsync(await file.ToStorageFileAsync());
}
}
}
