使用 Xamlcropcontrol 裁剪图像,用于 UI 和 WriteableBitmapEx
本文关键字:UI WriteableBitmapEx 用于 Xamlcropcontrol 裁剪 图像 使用 | 更新日期: 2023-09-27 17:55:08
在过去的一周里,我一直在研究如何在我的 Windows 应用商店应用中添加裁剪个人资料图像的功能。到目前为止,我已经研究了Microsoft解决方案,但决定走一条不同的路线。我从NuGet下载了一个名为XamlCropControl的控件。它非常适合 UI,甚至可以为我提供诸如原始高度/宽度、裁剪的顶部/底部/左侧/右侧/宽度/高度等信息,所有这些都在 xaml 控件内。我的问题是如何获取这些信息并使用WriteableBitmapEx裁剪图像。到目前为止,这是我的代码,我遇到了问题。
private async void ProfilePhotoImageClick(object sender, TappedRoutedEventArgs e)
{
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".png");
StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
{
using (Windows.Storage.Streams.IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
Windows.UI.Xaml.Media.Imaging.BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(fileStream);
BackgroundLogo.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
PhotoUploadCropper.Opacity = 1;
PhotoUploadCropper.ImageSource = bitmapImage;
ProfileSetupStackPanel.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
imagetoResize = bitmapImage;
}
}
}
BitmapImage imagetoResize;
private void AcceptPhotoImageCropClick(object sender, RoutedEventArgs e)
{
WriteableBitmap bmp = new WriteableBitmap(0,0).FromContent(imagetoResize);
var croppedBmp = bmp.Crop(0, 0, bmp.PixelWidth / 2, bmp.PixelHeight / 2);
croppedBmp.SaveToMediaLibrary("ProfilePhoto.jpg");
}
PhotoUploadCropper 是 xamlcropcontrol。
这是来自 xamlcropcontrol 的信息
这是我遇到的问题
它告诉我,如果我在那里有(图像调整大小),FromContent 没有定义,但如果我删除它,我不会出错。完成所有裁剪后,它将上传到我已经设置的 azure blob 存储。
编辑:像这样工作。
private async void ProfilePhotoImageClick(object sender, TappedRoutedEventArgs e)
{
FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".png");
StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
{
using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read))
{
BitmapImage bitmapImage = new BitmapImage();
await bitmapImage.SetSourceAsync(fileStream);
fileclone = file;
BackgroundLogo.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
PhotoUploadCropper.IsEnabled = true;
PhotoUploadCropper.Opacity = 1;
PhotoUploadCropper.ImageSource = bitmapImage;
ProfileSetupStackPanel.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
}
}
}
StorageFile fileclone;
async Task<WriteableBitmap> LoadBitmap(StorageFile file)
{
int cropx = PhotoUploadCropper.CropTop;
int cropy = PhotoUploadCropper.CropLeft;
int cropW = PhotoUploadCropper.CropWidth;
int cropH = PhotoUploadCropper.CropHeight;
using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read))
{
var bmp = await BitmapFactory.New(1, 1).FromStream(fileStream);
var croppedBmp = bmp.Crop(cropy, cropx, cropW, cropH);
var resizedcroppedBmp = croppedBmp.Resize(200, 200, WriteableBitmapExtensions.Interpolation.Bilinear);
return resizedcroppedBmp;
}
}
private async void AcceptPhotoImageCropClick(object sender, RoutedEventArgs e)
{
var CroppedBMP = await CropBitmap(fileclone);
using (IRandomAccessStream fileStream = new InMemoryRandomAccessStream())
{
string filename = Path.GetRandomFileName() + ".JPG";
var file = await Windows.Storage.ApplicationData.Current.TemporaryFolder.CreateFileAsync(filename, CreationCollisionOption.GenerateUniqueName);
using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);
Stream pixelStream = CroppedBMP.PixelBuffer.AsStream();
byte[] pixels = new byte[pixelStream.Length];
await pixelStream.ReadAsync(pixels, 0, pixels.Length);
encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint)CroppedBMP.PixelWidth, (uint)CroppedBMP.PixelHeight, 96.0, 96.0, pixels);
await encoder.FlushAsync();
}
ProfilePhotoButtonsGrid.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
BackgroundLogo.Visibility = Windows.UI.Xaml.Visibility.Visible;
PhotoUploadCropper.IsEnabled = false;
PhotoUploadCropper.Opacity = 0;
ProfileSetupStackPanel.Visibility = Windows.UI.Xaml.Visibility.Visible;
if (fileStream != null)
{
UploadFile(file);
}
}
}
为此,您必须使用 WBX WinRT API。看起来您正在尝试WP/Silverlight方法。
试试这个:
async Task<WriteableBitmap> LoadBitmap(string path)
{
Uri imageUri = new Uri(BaseUri, path);
var bmp = await BitmapFactory.New(1, 1).FromContent(imageUri);
return bmp;
}
请注意,它需要一个 URI。在您的情况下,您可以直接使用 IRandomAccessStream:
var bmp = await BitmapFactory.New(1, 1).FromStream(fileStream);