private static async Task SaveFacesForTileAsync(List <Rect> faces, IBuffer imageBuffer, int postId)
{
foreach (var face in faces)
{
var imageFolder = await ApplicationData.Current.LocalFolder.CreateFolderAsync(TILE_FOLDER_NAME, CreationCollisionOption.OpenIfExists);
var imageFile = await imageFolder.CreateFileAsync($"{postId}-{faces.IndexOf(face)}.jpg", CreationCollisionOption.ReplaceExisting);
await FileIO.WriteBufferAsync(imageFile, imageBuffer);
await CropBitmap.GetCroppedBitmapAsync(imageFile, face, 1);
}
}
private static async Task CropImageFile(StorageFile imageFile, Size imageSize, CropMethod method, Size screenSize, IBuffer previewBuffer)
{
switch (method)
{
case CropMethod.None:
break;
case CropMethod.Center:
{
var cropRect = CropBitmap.GetCenterCropRect(imageSize, screenSize);
await CropBitmap.GetCroppedBitmapAsync(imageFile, cropRect, 1.0);
}
break;
case CropMethod.TopMiddle:
{
var cropRect = CropBitmap.GetTopMiddleCropRect(imageSize, screenSize);
await CropBitmap.GetCroppedBitmapAsync(imageFile, cropRect, 1.0);
}
break;
case CropMethod.MostFaces:
case CropMethod.BiggestFace:
var result = await DetechFromBufferAsync(previewBuffer, 3, 25);
var faces = ImageCropper.ScaleFaces(result.Faces, imageSize, result.FrameSize);
if (faces.Count() > 0)
{
if (method == CropMethod.BiggestFace)
{
faces = faces.OrderByDescending(o => o.Width).Take(1);
}
var cropRect = CropBitmap.GetGreedyCropRect(imageSize, screenSize, faces);
await CropBitmap.GetCroppedBitmapAsync(imageFile, cropRect, 1.0);
}
else
{
// No face detected, fall back crop
var cropRect = CropBitmap.GetTopMiddleCropRect(imageSize, screenSize);
await CropBitmap.GetCroppedBitmapAsync(imageFile, cropRect, 1.0);
}
break;
default:
break;
}
}
public static async Task SetLockScreen(Post post, Rect cropRect)
{
Uri urlToDownload;
if (false) // TODO: detect whether the device is a phone
{
// Only select file smaller than 2MB as the system required
if (post.FileSize <= 2000000)
{
urlToDownload = new Uri(post.FileUrl);
}
else if (post.JpegFileSize <= 2000000)
{
urlToDownload = new Uri(post.JpegUrl);
}
else if (post.SampleFileSize <= 2000000)
{
urlToDownload = new Uri(post.SampleUrl);
}
else
{
urlToDownload = new Uri(post.PreviewUrl);
}
}
else
{
urlToDownload = new Uri(post.JpegUrl);
}
// Download the file into local storage
var imageSaved = await DownloadImageFromUri(urlToDownload, BackgroundTaskType.LockScreen);
// Crop if needed
//if (cropRect)
//{
await CropBitmap.GetCroppedBitmapAsync(imageSaved, cropRect, 1);
//}
// Set the lockScreen
await ChangeLockScreenBackground(imageSaved);
// Delete the local file
}