private async void CanvasCreateResources(object o, RoutedEventArgs routedEventArgs)
{
// initialize current displayinfo
UpdateDisplayInfo();
DisplayInformation.DisplayContentsInvalidated += DisplayInformation_DisplayContentsInvalidated;
// create swapchain
var swapChain = new CanvasSwapChain(CanvasDevice.GetSharedDevice(), (float)CanvasWidth, (float)CanvasHeight, 96);
_canvas.SwapChain = swapChain;
// create back buffer
_buffer = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight));
_tmpBuffer = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight));
// create default layer
AddLayer();
_background = await CanvasBitmap.LoadAsync(_canvas.SwapChain, new Uri("ms-appx:///PaintCanvas/Assets/canvas.png"));
//_canvas.Invalidate();
Invalidate();
Win2dInitialized?.Invoke(this, EventArgs.Empty);
// initialize background input thread
ThreadPool.RunAsync(_ =>
{
// touch processor
_inputSource = _canvas.CreateCoreIndependentInputSource(
CoreInputDeviceTypes.Touch | CoreInputDeviceTypes.Mouse | CoreInputDeviceTypes.Pen
);
_inputSource.PointerPressed += CanvasPointerPressed;
_inputSource.PointerMoved += CanvasPointerMoved;
_inputSource.PointerReleased += CanvasPointerReleased;
_inputSource.PointerCaptureLost += CanvasPointerReleased;
_inputSource.PointerWheelChanged += CanvasWheelChanged;
// setup gesture recognizer
_recognizer = new GestureRecognizer {
AutoProcessInertia = true
};
_recognizer.GestureSettings =
GestureSettings.ManipulationTranslateInertia | GestureSettings.ManipulationTranslateRailsX |
GestureSettings.ManipulationTranslateRailsY | GestureSettings.ManipulationTranslateX |
GestureSettings.ManipulationTranslateY |
GestureSettings.ManipulationScale | GestureSettings.ManipulationScaleInertia;
_recognizer.ManipulationUpdated += _recognizer_ManipulationUpdated;
_inputSource.Dispatcher.ProcessEvents(CoreProcessEventsOption.ProcessUntilQuit);
}, WorkItemPriority.High, WorkItemOptions.TimeSliced);
}
public async Task <bool> Export(IRandomAccessStream saveTo, Guid encoderId)
{
var canvas = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight), 96);
using (var ds = canvas.CreateDrawingSession())
{
DrawFrame(ds);
}
var pixels = canvas.GetPixelBytes();
var encoder = await BitmapEncoder.CreateAsync(encoderId, saveTo);
encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied,
(uint)CanvasWidth, (uint)CanvasHeight, 96, 96, pixels);
await encoder.FlushAsync();
canvas.Dispose();
return(true);
}
public InkLayer AddLayer(string name)
{
var layer = new InkLayer
{
Image = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight)),
Name = name,
IsVisible = true,
Opacity = 100
};
layer.PropertyChanged += Layer_PropertyChanged;
using (var ds = layer.Image.CreateDrawingSession())
{
ds.Clear();
}
_layers.Insert(0, layer);
ActiveLayer = layer;
return(layer);
}
public async Task <bool> ImportPicture(IRandomAccessStream stream)
{
var layer = new InkLayer
{
Image = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight)),
Name = "Imported",
IsVisible = true,
Opacity = 100
};
layer.PropertyChanged += Layer_PropertyChanged;
using (var bitmap = await CanvasBitmap.LoadAsync(_canvas.SwapChain, stream))
using (var ds = layer.Image.CreateDrawingSession())
{
ds.Clear();
ds.DrawImage(bitmap);
}
_layers.Add(layer);
//_canvas.Invalidate();
Invalidate();
return(true);
}
private void CanvasSizeChanged(object sender, SizeChangedEventArgs sizeChangedEventArgs)
{
_canvas?.SwapChain?.ResizeBuffers((float)CanvasWidth, (float)CanvasHeight, 96);
foreach (var layer in _layers)
{
var image = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight));
using (var ds = image.CreateDrawingSession())
{
ds.DrawImage(layer.Image);
}
var old = layer.Image;
layer.Image = image;
old.Dispose();
}
if (_buffer == null)
{
return;
}
_buffer.Dispose();
_tmpBuffer.Dispose();
_buffer = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight));
_tmpBuffer = CanvasRenderTargetExtension.CreateEmpty(_canvas, new Size(CanvasWidth, CanvasHeight));
Invalidate();
}