// Create SaveLabeledImageButton_Click to handle clicking saveLabeledImageButton.
// Allow use of "byte[] bytes = pixels.ToArray();".
//using System.Runtime.InteropServices.WindowsRuntime;
private async void SaveLabeledImageButton_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
Windows.UI.Xaml.Media.Imaging.RenderTargetBitmap renderTargetBitmap = new Windows.UI.Xaml.Media.Imaging.RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(this.ImageCanvas);
Windows.Storage.Pickers.FileSavePicker pickerToSaveLabeledImage = new Windows.Storage.Pickers.FileSavePicker();
pickerToSaveLabeledImage.FileTypeChoices.Add("PNG Image", new string[] { ".png" });
pickerToSaveLabeledImage.FileTypeChoices.Add("JPEG Image", new string[] { ".jpg" });
Windows.Storage.StorageFile fileToWhichToSave = await pickerToSaveLabeledImage.PickSaveFileAsync();
if (fileToWhichToSave != null)
{
Windows.Storage.Streams.IBuffer pixels = await renderTargetBitmap.GetPixelsAsync();
using (Windows.Storage.Streams.IRandomAccessStream stream = await fileToWhichToSave.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite))
{
Windows.Graphics.Imaging.BitmapEncoder encoder = await Windows.Graphics.Imaging.BitmapEncoder.CreateAsync(Windows.Graphics.Imaging.BitmapEncoder.JpegEncoderId, stream);
encoder.SetPixelData(
Windows.Graphics.Imaging.BitmapPixelFormat.Bgra8,
Windows.Graphics.Imaging.BitmapAlphaMode.Ignore,
(uint)renderTargetBitmap.PixelWidth,
(uint)renderTargetBitmap.PixelHeight,
Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi,
Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi,
pixels.ToArray());
await encoder.FlushAsync();
}
}
}
public static async System.Threading.Tasks.Task SavePathImageAsFile(int Width, int Height, string fileName, FrameworkElement element, bool UseRenderTarget = true)
{
double oldWidth = element.Width;
double oldHeight = element.Height;
double actOldWidth = element.ActualWidth;
double actOldHeight = element.ActualHeight;
//if (!UseRenderTarget)
{
//engine takes the Ceiling so make sure its below or sometimes off by 1 rounding up from ActualWidth/Height
element.Width = !UseRenderTarget?Math.Floor((float)Math.Min(Window.Current.Bounds.Width, Width)) : (float)Math.Min(Window.Current.Bounds.Width, Width);
element.Height = !UseRenderTarget?Math.Floor((float)Math.Min(Window.Current.Bounds.Height, Height)) : (float)Math.Min(Window.Current.Bounds.Height, Height);
//bool bHasCalledUpdateLayout = false;
//should wrap into another event handler and check a bHasCalledUpdateLayout to ignore early calls and race condition
//object lockVar = new object();
//EventHandler<object> eventHandler = null;
//System.Threading.Tasks.TaskCompletionSource<object> t = new System.Threading.Tasks.TaskCompletionSource<object>();
//eventHandler = (sender, e) => { lock (lockVar) { if (bHasCalledUpdateLayout && Math.Abs(element.ActualWidth - element.Width) <= 1 && Math.Abs(element.ActualHeight - element.Height) <= 1) { lock (lockVar) { if (bHasCalledUpdateLayout) { bHasCalledUpdateLayout = false; t.SetResult(e); } } } } };
//element.LayoutUpdated += eventHandler;
//lock (lockVar) {
// element.UpdateLayout();
// bHasCalledUpdateLayout = true;
//}
////await element.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, new Windows.UI.Core.DispatchedHandler(() => element.Dispatcher.ProcessEvents(Windows.UI.Core.CoreProcessEventsOption.ProcessAllIfPresent)));
//await t.Task;
//element.LayoutUpdated -= eventHandler;
await element.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Low, () => { });
if (!UseRenderTarget && (element.ActualWidth > element.Width || element.ActualHeight > element.Height))
{
if (element.ActualWidth > element.Width)
{
element.Width -= 1;
}
if (element.ActualHeight > element.Height)
{
element.Height -= 1;
}
//bHasCalledUpdateLayout = false;
//t = new System.Threading.Tasks.TaskCompletionSource<object>();
//eventHandler = (sender, e) => { lock (lockVar) { if (bHasCalledUpdateLayout && Math.Abs(element.ActualWidth - element.Width) <= 1 && Math.Abs(element.ActualHeight - element.Height) <= 1) { lock (lockVar) { if (bHasCalledUpdateLayout) { bHasCalledUpdateLayout = false; t.SetResult(e); } } } } };
//element.LayoutUpdated += eventHandler;
//lock (lockVar)
//{
// element.UpdateLayout();
// bHasCalledUpdateLayout = true;
//}
//await t.Task;
//element.LayoutUpdated -= eventHandler;
await element.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Low, () => { });
}
}
#if WINDOWS_APP && STORETOOLKIT
if (!UseRenderTarget)
{
System.IO.MemoryStream memstream = await WinRTXamlToolkit.Composition.WriteableBitmapRenderExtensions.RenderToPngStream(element);
Windows.Storage.StorageFile file = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync(fileName + ".png", Windows.Storage.CreationCollisionOption.ReplaceExisting);
Windows.Storage.Streams.IRandomAccessStream stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
await stream.WriteAsync(memstream.GetWindowsRuntimeBuffer());
stream.Dispose();
}
else
{
#endif
//Canvas cvs = new Canvas();
//cvs.Width = Width;
//cvs.Height = Height;
//Windows.UI.Xaml.Shapes.Path path = new Windows.UI.Xaml.Shapes.Path();
//object val;
//Resources.TryGetValue((object)"PathString", out val);
//Binding b = new Binding
//{
// Source = (string)val
//};
//BindingOperations.SetBinding(path, Windows.UI.Xaml.Shapes.Path.DataProperty, b);
//cvs.Children.Add(path);
float dpi = Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi;
Windows.UI.Xaml.Media.Imaging.RenderTargetBitmap wb = new Windows.UI.Xaml.Media.Imaging.RenderTargetBitmap();
await wb.RenderAsync(element, (int)((float)Width * 96 / dpi), (int)((float)Height * 96 / dpi));
Windows.Storage.Streams.IBuffer buf = await wb.GetPixelsAsync();
Windows.Storage.StorageFile file = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync(fileName + ".png", Windows.Storage.CreationCollisionOption.ReplaceExisting);
Windows.Storage.Streams.IRandomAccessStream stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
//Windows.Graphics.Imaging.BitmapPropertySet propertySet = new Windows.Graphics.Imaging.BitmapPropertySet();
//propertySet.Add("ImageQuality", new Windows.Graphics.Imaging.BitmapTypedValue(1.0, Windows.Foundation.PropertyType.Single)); // Maximum quality
Windows.Graphics.Imaging.BitmapEncoder be = await Windows.Graphics.Imaging.BitmapEncoder.CreateAsync(Windows.Graphics.Imaging.BitmapEncoder.PngEncoderId, stream); //, propertySet);
be.SetPixelData(Windows.Graphics.Imaging.BitmapPixelFormat.Bgra8, Windows.Graphics.Imaging.BitmapAlphaMode.Premultiplied, (uint)wb.PixelWidth, (uint)wb.PixelHeight, dpi, dpi, buf.ToArray());
await be.FlushAsync();
await stream.GetOutputStreamAt(0).FlushAsync();
stream.Dispose();
#if WINDOWS_APP && STORETOOLKIT
}
#endif
//if (!UseRenderTarget)
{
element.Width = oldWidth;
element.Height = oldHeight;
//bHasCalledUpdateLayout = false;
//t = new System.Threading.Tasks.TaskCompletionSource<object>();
//eventHandler = (sender, e) => { lock (lockVar) { if (bHasCalledUpdateLayout && Math.Abs(element.ActualWidth - actOldWidth) <= 1 && Math.Abs(element.ActualHeight - actOldHeight) <= 1) { lock (lockVar) { if (bHasCalledUpdateLayout) { bHasCalledUpdateLayout = false; t.SetResult(e); } } } } };
//element.LayoutUpdated += eventHandler;
//lock (lockVar)
//{
// element.UpdateLayout();
// bHasCalledUpdateLayout = true;
//}
//await t.Task;
//element.LayoutUpdated -= eventHandler;
await element.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Low, () => { });
}
}
