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;
}
}
