我正在尝试实现一个更改锁屏图像的 Windows Phone 8 应用程序。将图像写入独立存储的部分代码如下:
private async void photoChooserTask_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
store.Remove();
}
BitmapImage bi = new BitmapImage();
bi.SetSource(e.ChosenPhoto);
WriteableBitmap wb = new WriteableBitmap(bi);
byte[] buffer = null;
using (var ms = new System.IO.MemoryStream())
{
int quality = 80;
e.ChosenPhoto.Seek(0, SeekOrigin.Begin);
// TODO: Crop or rotate here if needed
wb.SaveJpeg(ms, wb.PixelWidth, wb.PixelHeight, 0, quality);
buffer = ms.ToArray();
}
var isoFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
var nextImageName = Guid.NewGuid() + ".jpg";
var newImageFile = await isoFolder.CreateFileAsync(nextImageName, Windows.Storage.CreationCollisionOption.FailIfExists);
using (var wfs = await newImageFile.OpenStreamForWriteAsync())
{
wfs.Write(buffer, 0, buffer.Length);
}
Windows.Phone.System.UserProfile.LockScreen.SetImageUri(new Uri("ms-appdata:///Local/" + nextImageName, UriKind.Absolute));
MessageBox.Show("You have successfully set a new background");
}
}
在代码中间,您会看到以下注释:
// TODO: Crop or rotate here if needed
我的问题是:
原生图像裁剪的代码是什么?(例如,当您通过本机 Windows Phone 锁屏设置为锁屏选择照片时看到的那个)