private void DrawRegion(CanvasVirtualImageSource sender, Rect region)
{
var tryPanningOrZoomingLayout = new CanvasTextLayout(sender.Device, "Try panning or zooming.", format, 500, 0);
var infoLayout = new CanvasTextLayout(sender.Device,
"In this demo, each time a region is updated, it is cleared to a different background color. " +
"This is to make it possible to see which regions get redrawn.",
format, 500, 0);
var youMadeIt = new CanvasTextLayout(sender.Device,
"You made it to the end!", endFormat, 1000, 0);
using (var ds = sender.CreateDrawingSession(NextColor(), region))
{
var left = ((int)(region.X / gridSize) - 1) * gridSize;
var top = ((int)(region.Y / gridSize) - 1) * gridSize;
var right = ((int)((region.X + region.Width) / gridSize) + 1) * gridSize;
var bottom = ((int)((region.Y + region.Height) / gridSize) + 1) * gridSize;
for (var x = left; x <= right; x += gridSize)
{
for (var y = top; y <= bottom; y += gridSize)
{
var pos = new Vector2((float)x, (float)y);
ds.DrawCircle(pos, 10, Colors.White);
ds.DrawText(string.Format("{0}\n{1}", x, y), pos, Colors.DarkBlue, coordFormat);
}
}
DrawTextWithBackground(ds, tryPanningOrZoomingLayout, gridSize / 2, gridSize / 2);
DrawTextWithBackground(ds, infoLayout, gridSize * 3.5, gridSize * 5.5);
DrawTextWithBackground(ds, youMadeIt, width - youMadeIt.RequestedSize.Width, height - youMadeIt.RequestedSize.Height);
}
}
private void RegionsInvalidatedHandler(CanvasVirtualImageSource sender, CanvasRegionsInvalidatedEventArgs args)
{
foreach (var region in args.InvalidatedRegions)
{
RenderRegion(region);
}
}
private void ImageSource_RegionsInvalidated(CanvasVirtualImageSource sender, CanvasRegionsInvalidatedEventArgs args)
{
++regionsInvalidatedEventCount;
var invalidatedRegions = args.InvalidatedRegions;
regionsInvalidatedCount += invalidatedRegions.Count();
status.Text = string.Format("{0} RegionsInvalidated events, {1} total regions invalidated", regionsInvalidatedEventCount, regionsInvalidatedCount);
try
{
foreach (var region in invalidatedRegions)
{
DrawRegion(sender, region);
}
}
catch (Exception e)
{
if (!sender.Device.IsDeviceLost(e.HResult))
{
throw;
}
sender.Device.RaiseDeviceLost();
}
}
private void DrawRegion(CanvasVirtualImageSource sender, Rect region)
{
var tryPanningOrZoomingLayout = new CanvasTextLayout(sender.Device, "Try panning or zooming.", format, 500, 0);
var infoLayout = new CanvasTextLayout(sender.Device,
"In this demo, each time a region is updated, it is cleared to a different background color. " +
"This is to make it possible to see which regions get redrawn.",
format, 500, 0);
var youMadeIt = new CanvasTextLayout(sender.Device,
"You made it to the end!", endFormat, 1000, 0);
using (var ds = sender.CreateDrawingSession(NextColor(), region))
{
var left = ((int)(region.X / gridSize) - 1) * gridSize;
var top = ((int)(region.Y / gridSize) - 1) * gridSize;
var right = ((int)((region.X + region.Width) / gridSize) + 1) * gridSize;
var bottom = ((int)((region.Y + region.Height) / gridSize) + 1) * gridSize;
for (var x = left; x <= right; x += gridSize)
{
for (var y = top; y <= bottom; y += gridSize)
{
var pos = new Vector2((float)x, (float)y);
ds.DrawCircle(pos, 10, Colors.White);
ds.DrawText(string.Format("{0}\n{1}", x, y), pos, Colors.DarkBlue, coordFormat);
}
}
DrawTextWithBackground(ds, tryPanningOrZoomingLayout, gridSize / 2, gridSize / 2);
DrawTextWithBackground(ds, infoLayout, gridSize * 3.5, gridSize * 5.5);
DrawTextWithBackground(ds, youMadeIt, width - youMadeIt.RequestedSize.Width, height - youMadeIt.RequestedSize.Height);
}
}
private void UserControl_Loaded(object sender, RoutedEventArgs args)
{
CompositionTarget.SurfaceContentsLost += CompositionTarget_SurfaceContentsLost;
var device = CanvasDevice.GetSharedDevice();
imageSource = new CanvasVirtualImageSource(device, width, height, dpi);
imageSource.RegionsInvalidated += ImageSource_RegionsInvalidated;
image.Source = imageSource.Source;
}
private void OnRegionsInvalidated(CanvasVirtualImageSource sender, CanvasRegionsInvalidatedEventArgs e)
{
foreach (var region in e.InvalidatedRegions)
{
var randomColor = CreateRandomColor();
using (sender.CreateDrawingSession(randomColor, region))
{
// Just changing colors...
}
}
}
public void Dispose()
{
if (_vsis == null)
{
return;
}
_vsis.RegionsInvalidated -= RegionsInvalidatedHandler;
_vsis = null;
_page = null;
GC.SuppressFinalize(this);
}
public VsisPageRenderer(DjvuPage page, Size pageViewSize)
{
_page = page;
var size = FindBestSize(pageViewSize);
_vsis = new CanvasVirtualImageSource(
resourceCreator: CanvasDevice.GetSharedDevice(),
width: (float)size.Width,
height: (float)size.Height,
dpi: DisplayInformation.GetForCurrentView().LogicalDpi,
alphaMode: CanvasAlphaMode.Ignore);
_vsis.RegionsInvalidated += RegionsInvalidatedHandler;
}
void Canvas_CreateResources(CanvasControl sender, CanvasCreateResourcesEventArgs args)
{
args.TrackAsyncAction(LoadCanvasResources(sender).AsAsyncAction());
imageBrush = new CanvasImageBrush(sender);
imageSource = new CanvasImageSource(sender, controlSize, controlSize);
imageControl.Source = imageSource;
virtualImageSource = new CanvasVirtualImageSource(sender, controlSize, controlSize);
virtualImageControl.Source = virtualImageSource.Source;
swapChain = new CanvasSwapChain(sender, controlSize, controlSize);
swapChainPanel.SwapChain = swapChain;
}
private void RemoveExistingImage()
{
if (_image == null)
{
return;
}
Container.Children.Remove(_image);
_source.RegionsInvalidated -= OnRegionsInvalidated;
_image.Source = null;
_device.Dispose();
_image = null;
_device = null;
_source = null;
}
private void CreateNewImage()
{
const float dpi = 96f * 1; // 300% dpi scale;
var device = new CanvasDevice();
var source = new CanvasVirtualImageSource(device, 10000, 10000, dpi);
var image = new Image
{
Width = 10000,
Height = 10000,
Stretch = Stretch.Fill,
Source = source.Source,
};
source.RegionsInvalidated += OnRegionsInvalidated;
Container.Children.Add(image);
_image = image;
_device = device;
_source = source;
}
private void UserControl_Loaded(object sender, RoutedEventArgs args)
{
CompositionTarget.SurfaceContentsLost += CompositionTarget_SurfaceContentsLost;
var device = CanvasDevice.GetSharedDevice();
imageSource = new CanvasVirtualImageSource(device, width, height, dpi);
imageSource.RegionsInvalidated += ImageSource_RegionsInvalidated;
image.Source = imageSource.Source;
}
private void ImageSource_RegionsInvalidated(CanvasVirtualImageSource sender, CanvasRegionsInvalidatedEventArgs args)
{
++regionsInvalidatedEventCount;
var invalidatedRegions = args.InvalidatedRegions;
regionsInvalidatedCount += invalidatedRegions.Count();
status.Text = string.Format("{0} RegionsInvalidated events, {1} total regions invalidated", regionsInvalidatedEventCount, regionsInvalidatedCount);
try
{
foreach (var region in invalidatedRegions)
{
DrawRegion(sender, region);
}
}
catch (Exception e)
{
if (!sender.Device.IsDeviceLost(e.HResult))
throw;
sender.Device.RaiseDeviceLost();
}
}
void Canvas_CreateResources(CanvasControl sender, CanvasCreateResourcesEventArgs args)
{
args.TrackAsyncAction(LoadCanvasResources(sender).AsAsyncAction());
imageBrush = new CanvasImageBrush(sender);
imageSource = new CanvasImageSource(sender, controlSize, controlSize);
imageControl.Source = imageSource;
virtualImageSource = new CanvasVirtualImageSource(sender, controlSize, controlSize);
virtualImageControl.Source = virtualImageSource.Source;
swapChain = new CanvasSwapChain(sender, controlSize, controlSize);
swapChainPanel.SwapChain = swapChain;
}