private void AddLayers(DrawArgs args)
{
IAssociatedTissues volume = args.SceneGraph.ParentPresentationImage as IAssociatedTissues;
if (volume == null)
return;
GraphicCollection layers = volume.TissueLayers;
vtkPropCollection props = _vtkRenderer.GetViewProps();
foreach (VolumeGraphic volumeGraphic in layers)
{
if (props.IsItemPresent(volumeGraphic.VtkProp) == 0)
_vtkRenderer.AddViewProp(volumeGraphic.VtkProp);
//if (volumeLayer.OldVtkProp != null)
//{
// if (props.IsItemPresent(volumeLayer.OldVtkProp) != 0)
// {
// props.RemoveItem(volumeLayer.OldVtkProp);
// volumeLayer.OldVtkProp = null;
// }
//}
}
}
private void RenderImage(DrawArgs args)
{
if (args.DrawMode == DrawMode.Refresh)
{
RefreshImage(args);
return;
}
if (_firstRender)
{
// the first time we try to render a freshly cloned image, we need to draw it twice
// this is to make sure the client rectangle is updated when we try to compute the correct point of interest
_firstRender = false;
RenderImage(args);
}
try
{
var sourceTransform = (ImageSpatialTransform)((ISpatialTransformProvider)SelectedPresentationImage).SpatialTransform;
var transform = (ImageSpatialTransform)((ISpatialTransformProvider)_magnificationImage).SpatialTransform;
float scale = sourceTransform.Scale * ToolSettings.DefaultInstance.MagnificationFactor;
transform.ScaleToFit = false;
transform.Scale = scale;
transform.TranslationX = 0;
transform.TranslationY = 0;
var midPoint = new PointF(args.RenderingSurface.ClientRectangle.Width / 2f, args.RenderingSurface.ClientRectangle.Height / 2f);
var sourcePointOfInterest = sourceTransform.ConvertToSource(_tileLocation);
// compute translation required to move the point of interest on the magnified image to the centre of the client area
var translation = transform.ConvertToSource(midPoint) - new SizeF(sourcePointOfInterest);
transform.TranslationX = translation.X;
transform.TranslationY = translation.Y;
_magnificationImage.Draw(args);
// clear the rendering exception message
_lastRenderExceptionMessage = null;
}
catch (Exception ex)
{
Platform.Log(LogLevel.Error, ex,
"An error has occured while rendering the magnified contents of the tile.");
// a rendering exception was encountered, so set the message field
_lastRenderExceptionMessage = ex is RenderingException
? ((RenderingException)ex).UserMessage
: ex.Message;
// we cannot simply pass the existing Graphics because we haven't released its hDC yet
// if we do, we'll get a "Object is currently in use elsewhere" exception
DrawErrorMessage(_lastRenderExceptionMessage, args.RenderingSurface.ContextID, args.RenderingSurface.ClientRectangle);
}
}
private void AddLayers(DrawArgs args)
{
IAssociatedTissues volume = args.SceneGraph.ParentPresentationImage as IAssociatedTissues;
if (volume == null)
return;
GraphicCollection layers = volume.TissueLayers;
vtkPropCollection props = _vtkRenderer.GetViewProps();
foreach (var graphic in layers)
{
var volumeGraphic = (VolumeGraphic) graphic;
if (props.IsItemPresent(volumeGraphic.VtkProp) == 0)
_vtkRenderer.AddViewProp(volumeGraphic.VtkProp);
}
}
/// <summary>
/// Initializes a <see cref="RenderingException"/>.
/// </summary>
/// <param name="innerException">The actual exception that was thrown in the rendering pipeline.</param>
/// <param name="drawArgs">The <see cref="DrawArgs"/> of the failed rendering operation.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="innerException"/> is null.</exception>
public RenderingException(Exception innerException, DrawArgs drawArgs)
: base("An exception was thrown in the rendering pipeline.", innerException)
{
if (innerException == null)
throw new ArgumentNullException("innerException", "An inner exception must be provided.");
// record as much information as possible about the rendering operation for debugging purposes
if (drawArgs != null)
{
DrawMode = drawArgs.DrawMode;
if (drawArgs.RenderingSurface != null)
{
WindowId = drawArgs.RenderingSurface.WindowID;
ContextId = drawArgs.RenderingSurface.ContextID;
ClientRectangle = drawArgs.RenderingSurface.ClientRectangle;
ClipRectangle = drawArgs.RenderingSurface.ClipRectangle;
}
}
}
protected override void OnPaint(PaintEventArgs e)
{
if (_surface != null)
{
_surface.ContextID = e.Graphics.GetHdc();
try
{
var args = new DrawArgs(_surface, new WinFormsScreenProxy(Screen.FromControl(this)), DrawMode.Refresh);
_render(args);
}
finally
{
e.Graphics.ReleaseHdc(_surface.ContextID);
}
}
//base.OnPaint(e);
}
private void RenderImage()
{
if (_surface == null)
return;
using (var graphics = base.CreateGraphics())
{
_surface.ContextID = graphics.GetHdc();
try
{
var args = new DrawArgs(_surface, new WinFormsScreenProxy(Screen.FromControl(this)), DrawMode.Render);
_render(args);
args = new DrawArgs(_surface, new WinFormsScreenProxy(Screen.FromControl(this)), DrawMode.Refresh);
_render(args);
}
finally
{
graphics.ReleaseHdc(_surface.ContextID);
}
}
}
/// <summary>
/// Renders the <see cref="PresentationImage"/> without firing any events.
/// </summary>
/// <exception cref="RenderingException">Thrown if any <see cref="Exception"/> is encountered while rendering the image.</exception>
protected void DrawNoEvents(DrawArgs drawArgs)
{
drawArgs.SceneGraph = this.SceneGraph;
Rectangle oldRectangle = _clientRectangle;
_clientRectangle = drawArgs.RenderingSurface.ClientRectangle;
try
{
this.ImageRenderer.Draw(drawArgs);
}
finally
{
_clientRectangle = oldRectangle;
}
}
public override void Draw(DrawArgs drawArgs)
{
if (_delayedEventPublisher == null && SynchronizationContext.Current != null)
_delayedEventPublisher = new DelayedEventPublisher(OnDelayedProgressChanged, 1000, DelayedEventPublisherTriggerMode.Periodic);
var asyncFrame = Frame;
using (asyncFrame.AcquireLock())
{
if (!asyncFrame.IsAsyncLoaded)
{
if (!Visible) // if this is an off-screen draw, wait for data to be loaded
{
lock (_waitPixelData)
{
if (!asyncFrame.IsAsyncLoaded)
{
var completionHandler = new EventHandler((s, e) =>
{
lock (_waitPixelData)
{
Monitor.Pulse(_waitPixelData);
}
});
var onFrameAsyncLoaded = new AsyncPixelDataEventHandler(completionHandler);
var onFrameAsyncFaulted = new AsyncPixelDataFaultEventHandler(completionHandler);
asyncFrame.AsyncLoaded += onFrameAsyncLoaded;
asyncFrame.AsyncFaulted += onFrameAsyncFaulted;
asyncFrame.GetNormalizedPixelData();
// check the flag again, in case the event actually fired before we hooked up the handler
if (!asyncFrame.IsAsyncLoaded)
Monitor.Wait(_waitPixelData);
asyncFrame.AsyncLoaded -= onFrameAsyncLoaded;
asyncFrame.AsyncFaulted -= onFrameAsyncFaulted;
}
}
}
else if (!ApplicationGraphics.OfType<ProgressGraphic>().Any())
{
ProgressGraphic.Show(this, ApplicationGraphics, true, ProgressBarGraphicStyle.Continuous, false);
}
}
base.Draw(drawArgs);
}
}
/// <summary>
/// Forces a render of the specified image and setting the image's client rectangle property at the same time.
/// </summary>
public static Bitmap RenderImage(this IPresentationImage image, Rectangle clientRectangle)
{
// we can't just call image.DrawToBitmap because we also want to force the client rectangle of the image
// which wouldn't be set correctly because the image has possibly never been drawn in a Tile before
var presentationImage = image as PresentationImage;
if (presentationImage != null)
{
var bmp = new Bitmap(clientRectangle.Width, clientRectangle.Height, PixelFormat.Format32bppArgb);
var graphics = System.Drawing.Graphics.FromImage(bmp);
var contextId = graphics.GetHdc();
try
{
using (var surface = presentationImage.ImageRenderer.CreateRenderingSurface(IntPtr.Zero, clientRectangle.Width, clientRectangle.Height, RenderingSurfaceType.Offscreen))
{
surface.ContextID = contextId;
surface.ClipRectangle = new Rectangle(0, 0, clientRectangle.Width, clientRectangle.Height);
var drawArgs = new DrawArgs(surface, null, DrawMode.Render);
presentationImage.Draw(drawArgs);
drawArgs = new DrawArgs(surface, null, DrawMode.Refresh);
presentationImage.Draw(drawArgs);
}
}
finally
{
graphics.ReleaseHdc(contextId);
graphics.Dispose();
}
return bmp;
}
else
{
throw new NotSupportedException("Image type is not supported");
}
}
/// <summary>
/// Initializes the member variables before calling <see cref="Render"/> or <see cref="Refresh"/>.
/// </summary>
protected virtual void Initialize(DrawArgs drawArgs)
{
_drawMode = drawArgs.DrawMode;
_sceneGraph = drawArgs.SceneGraph;
_surface = drawArgs.RenderingSurface;
Dpi = drawArgs.Dpi;
}
protected override void OnPaint(PaintEventArgs e)
{
//Assume anything Vista or later has the same issues.
if (IsVistaOrLater())
{
//Windows Vista is opportunistic when it comes to wait conditions (e.g. locks, Mutexes, etc)
//in that it will actually process WM_PAINT messages on the current thread, even though
//it is supposed to be blocking in a WaitSleepJoin state. This behaviour can actually
//break rendering for a couple of reasons:
// 1. We do custom double-buffering, and it's possible that we could process a paint message
// for an image that hasn't actually been rendered to the back buffer yet.
// 2. The renderer itself accesses the pixel data of the ImageSops, which is a synchronized operation.
// In the case where 2 threads try to load the pixel data of an image simultaneously, the renderer can end up
// blocking execution on the main UI thread in the middle of a rendering operation. If we
// allow another tile to paint in this situation, it actually causes some GDI errors because
// the previous rendering operation has not yet completed.
if (_isDrawing || _painting)
{
e.Graphics.Clear(Color.Black);
//Queue this tile up for deferred painting and return.
if (!_tilesToRepaint.Contains(this))
_tilesToRepaint.Add(this);
return;
}
//We're about to paint this tile, so remove it from the queue.
_tilesToRepaint.Remove(this);
}
if (_tile.PresentationImage == null)
DisposeSurface();
if (this.Surface == null)
{
// Make sure tile gets blacked out if there's
// no presentation image in it
e.Graphics.Clear(Color.Black);
}
else
{
this.Surface.WindowID = this.Handle;
this.Surface.ContextID = e.Graphics.GetHdc();
this.Surface.ClientRectangle = this.ClientRectangle;
this.Surface.ClipRectangle = e.ClipRectangle;
DrawArgs args = new DrawArgs(this.Surface,
new WinFormsScreenProxy(Screen.FromControl(this)),
DrawMode.Refresh);
_painting = true;
try
{
_tile.Draw(args);
// if an exception was encountered the last time we rendered the buffer, refresh the error text now
if (!string.IsNullOrEmpty(_lastRenderExceptionMessage))
{
// we cannot simply pass the Graphics because we haven't released its hDC yet
// if we do, we'll get a "Object is currently in use elsewhere" exception
DrawErrorMessage(_lastRenderExceptionMessage, Surface.ContextID, ClientRectangle);
}
}
catch (Exception ex)
{
Platform.Log(LogLevel.Error, ex, "An error has occured while refreshing the contents of a tile.");
var exceptionMessage = ex is RenderingException ? ((RenderingException) ex).UserMessage : ex.Message;
// we cannot simply pass the existing Graphics because we haven't released its hDC yet
// if we do, we'll get a "Object is currently in use elsewhere" exception
DrawErrorMessage(exceptionMessage, Surface.ContextID, ClientRectangle);
}
finally
{
e.Graphics.ReleaseHdc(this.Surface.ContextID);
_painting = false;
}
}
// Now that we've finished painting this tile, we can process the deferred paint jobs.
// The code below is self-fulfilling, in that we remove one tile from the queue and
// invalidate it, causing it to paint. When it's done painting, it will remove and
// invalidate the next one, and so on.
if (IsVistaOrLater() && _tilesToRepaint.Count > 0)
{
TileControl tileToRepaint = _tilesToRepaint[0];
_tilesToRepaint.RemoveAt(0);
tileToRepaint.Invalidate();
tileToRepaint.Update();
}
//base.OnPaint(e);
}
private void DoDraw()
{
EventsHelper.Fire(_drawing, this, EventArgs.Empty);
CodeClock clock = new CodeClock();
clock.Start();
if (this.Surface != null)
{
System.Drawing.Graphics graphics = this.CreateGraphics();
this.Surface.WindowID = this.Handle;
this.Surface.ContextID = graphics.GetHdc();
this.Surface.ClientRectangle = this.ClientRectangle;
this.Surface.ClipRectangle = this.ClientRectangle;
DrawArgs args = new DrawArgs(this.Surface,
new WinFormsScreenProxy(Screen.FromControl(this)),
DrawMode.Render);
_isDrawing = true;
try
{
_tile.Draw(args);
_lastRenderExceptionMessage = null;
}
catch (Exception ex)
{
Platform.Log(LogLevel.Error, ex, "An error has occured while rendering the contents of a tile.");
_lastRenderExceptionMessage = ex is RenderingException ? ((RenderingException) ex).UserMessage : ex.Message;
// we cannot simply pass the existing Graphics because we haven't released its hDC yet
// if we do, we'll get a "Object is currently in use elsewhere" exception
DrawErrorMessage(_lastRenderExceptionMessage, Surface.ContextID, ClientRectangle);
}
finally
{
graphics.ReleaseHdc(this.Surface.ContextID);
graphics.Dispose();
_isDrawing = false;
}
}
//Cause the tile to paint/refresh.
Invalidate();
Update();
clock.Stop();
string str = String.Format("TileControl.Draw: {0}, {1}\n", clock.ToString(), this.Size.ToString());
Trace.Write(str);
}
public void Draw(DrawArgs args)
{
CreateRenderer();
AddLayers(args);
_surface.Draw();
}
/// <summary>
/// Initializes the member variables before calling <see cref="RendererBase.Render"/> or <see cref="RendererBase.Refresh"/>.
/// </summary>
protected override void Initialize(DrawArgs drawArgs)
{
base.Initialize(drawArgs);
}
private void RefreshImage(DrawArgs args)
{
try
{
// if there was an exception the last time we rendered the buffer, don't refresh from the buffer and instead redraw the error message
if (string.IsNullOrEmpty(_lastRenderExceptionMessage))
{
_magnificationImage.Draw(args);
}
else
{
// we cannot simply pass the existing Graphics because we haven't released its hDC yet
// if we do, we'll get a "Object is currently in use elsewhere" exception
DrawErrorMessage(_lastRenderExceptionMessage, args.RenderingSurface.ContextID, args.RenderingSurface.ClientRectangle);
}
}
catch (Exception ex)
{
Platform.Log(LogLevel.Error, ex, "An error has occured while refreshing the magnified contents of the tile.");
var exceptionMessage = ex is RenderingException ? ((RenderingException)ex).UserMessage : ex.Message;
// we cannot simply pass the Graphics because we haven't released its hDC yet
// if we do, we'll get a "Object is currently in use elsewhere" exception
DrawErrorMessage(exceptionMessage, args.RenderingSurface.ContextID, args.RenderingSurface.ClientRectangle);
}
}
public void Draw(DrawArgs drawArgs)
{
Wrapper.Item.Draw(drawArgs);
}
/// <summary>
/// Raises the <see cref="EventBroker.ImageDrawing"/> event and
/// renders the <see cref="PresentationImage"/>.
/// </summary>
/// <param name="drawArgs"></param>
/// <remarks>
/// For internal Framework use only.
/// </remarks>
/// <exception cref="RenderingException">Thrown if any <see cref="Exception"/> is encountered while rendering the image.</exception>
public virtual void Draw(DrawArgs drawArgs)
{
drawArgs.SceneGraph = this.SceneGraph;
_clientRectangle = drawArgs.RenderingSurface.ClientRectangle;
// Let others know that we're about to draw
ImageDrawingEventArgs args = new ImageDrawingEventArgs(this);
if (this.ImageViewer != null && this.ImageViewer.EventBroker != null)
this.ImageViewer.EventBroker.OnImageDrawing(args);
OnDrawing();
this.ImageRenderer.Draw(drawArgs);
}
/// <summary>
/// Renders the specified scene graph to the graphics surface.
/// </summary>
/// <remarks>
/// Calling code should take care to handle any exceptions in a manner suitable to the context of
/// the rendering operation. For example, the view control for an
/// <see cref="ITile"/> may wish to display the error message in the tile's client area <i>without
/// crashing the control</i>, whereas an image export routine may wish to notify the user via an error
/// dialog and have the export output <i>fail to be created</i>. Automated routines (such as unit
/// tests) may even wish that the exception bubble all the way to the top for debugging purposes.
/// </remarks>
/// <param name="drawArgs">A <see cref="DrawArgs"/> object that specifies the graphics surface and the scene graph to be rendered.</param>
/// <exception cref="RenderingException">Thrown if any <see cref="Exception"/> is encountered in the rendering pipeline.</exception>
public virtual void Draw(DrawArgs drawArgs)
{
try
{
Initialize(drawArgs);
if (drawArgs.RenderingSurface.ClientRectangle.Width == 0 || drawArgs.RenderingSurface.ClientRectangle.Height == 0)
return;
if (DrawMode == DrawMode.Render)
Render();
else
Refresh();
}
catch (Exception e)
{
throw new RenderingException(e, drawArgs);
}
finally
{
_sceneGraph = null;
_surface = null;
}
}
/// <summary>
/// Renders the <see cref="PresentationImage"/> to a provided offscreen <see cref="Bitmap"/>.
/// </summary>
/// <param name="bmp">The offscreen bitmap to render to.</param>
/// <returns></returns>
/// <remarks>
/// This method can be used anywhere an offscreen bitmap is required, such as
/// paper/DICOM printing, thumbnail generation, creation of new DICOM images, etc.
/// </remarks>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="bmp"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown if <paramref name="bmp"/> has invalid dimensions.</exception>
/// <exception cref="RenderingException">Thrown if any <see cref="Exception"/> is encountered while rendering the image.</exception>
public virtual void DrawToBitmap(Bitmap bmp)
{
Platform.CheckForNullReference(bmp, "bmp");
Platform.CheckPositive(bmp.Width, "bmp.Width");
Platform.CheckPositive(bmp.Height, "bmp.Height");
var graphics = System.Drawing.Graphics.FromImage(bmp);
var contextId = graphics.GetHdc();
try
{
using (var surface = ImageRenderer.GetRenderingSurface(IntPtr.Zero, bmp.Width, bmp.Height))
{
surface.ContextID = contextId;
surface.ClipRectangle = new Rectangle(0, 0, bmp.Width, bmp.Height);
var drawArgs = new DrawArgs(surface, null, DrawMode.Render);
DrawNoEvents(drawArgs);
drawArgs = new DrawArgs(surface, null, DrawMode.Refresh);
DrawNoEvents(drawArgs);
}
}
finally
{
graphics.ReleaseHdc(contextId);
graphics.Dispose();
}
}
private static Bitmap ImageDrawToBitmap(IPresentationImage presentationImage, int width, int height, float dpi)
{
if (!(presentationImage is PresentationImage))
return presentationImage.DrawToBitmap(width, height);
var image = (PresentationImage) presentationImage;
var bmp = new Bitmap(width, height);
var graphics = System.Drawing.Graphics.FromImage(bmp);
var contextId = graphics.GetHdc();
try
{
using (var surface = image.ImageRenderer.CreateRenderingSurface(IntPtr.Zero, bmp.Width, bmp.Height, RenderingSurfaceType.Offscreen))
{
surface.ContextID = contextId;
surface.ClipRectangle = new Rectangle(0, 0, bmp.Width, bmp.Height);
var drawArgs = new DrawArgs(surface, null, DrawMode.Render) {Dpi = dpi, Tag = bmp};
image.Draw(drawArgs);
drawArgs = new DrawArgs(surface, null, DrawMode.Refresh) { Dpi = dpi, Tag = bmp};
image.Draw(drawArgs);
}
}
finally
{
graphics.ReleaseHdc(contextId);
graphics.Dispose();
}
return bmp;
}
public void Draw(DrawArgs drawArgs)
{
Wrapper.Item.Draw(drawArgs);
}
