/// <summary>
/// Called when we've to draw the image.
/// </summary>
/// <param name="graphics">The graphics.</param>
private void OnDraw(Graphics2D graphics)
{
if (IsDisposed) { throw new ObjectDisposedException("ImageDataFlowHelper"); }
if (this.SyncBuffer == null) { return; }
// Change bitmap contents if needed
if (this.SyncBufferChanged)
{
lock (this.SyncBufferLock)
{
// Recreate bitmap on need
if ((this.BitmapSize != this.SyncBufferSize) ||
(this.Bitmap == null))
{
CommonTools.SafeDispose(ref this.Bitmap);
this.Bitmap = new WriteableBitmapResource(
new Size2(this.SyncBufferSize.Width, this.SyncBufferSize.Height),
BitmapFormat.Bgra, AlphaMode.Ignore);
this.BitmapSize = this.SyncBufferSize;
}
// Write data from SyncBuffer to bitmap
this.Bitmap.SetBitmapContent(
graphics,
this.SyncBuffer.Pointer,
this.SyncBuffer.Pitch);
}
}
// Draw the bitmap on the screen
if ((this.Bitmap != null) &&
(this.BitmapSize.Width > 0) &&
(this.BitmapSize.Height > 0))
{
graphics.Clear(Color4.Transparent);
// Draw the current contents of the stream
RectangleF viewBounds = new RectangleF(
0f, 0f,
graphics.ScreenSize.Width, graphics.ScreenSize.Height);
graphics.DrawBitmap(this.Bitmap, viewBounds);
// Draw the stream's name
RectangleF titleBounds = new RectangleF(
viewBounds.Width / 2f - 100f,
10f,
200f, 30f);
graphics.FillRoundedRectangle(titleBounds, 5f, 5f, this.TextBackground);
graphics.DrawText(
this.StreamName, this.TextFormat,
titleBounds,
this.TextForeground);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ImageDataFlowHelper"/> class.
/// </summary>
/// <param name="width">The width of the image.</param>
/// <param name="height">The height of the image.</param>
public ImageDataFlowHelper(string streamName)
{
this.StreamName = streamName;
this.TextFormat = new TextFormatResource("Arial", 18f, FontWeight.Bold);
this.TextFormat.TextAlignment = TextAlignment.Center;
this.TextFormat.ParagraphAlignment = ParagraphAlignment.Center;
this.TextBackground = new SolidBrushResource(Color4.LightGray.ChangeAlphaTo(0.7f));
this.TextForeground = new SolidBrushResource(Color4.DarkBlue);
// Initialize scene(s)
this.Scene = new Scene();
this.Scene.ManipulateSceneAsync((manipulator) =>
{
manipulator.AddDrawingLayer(OnDraw);
}).FireAndForget();
// Initialize members for Direct2D rendering
this.Bitmap = null;
this.BitmapSize = new Size2(0, 0);
// Initialize members for synchronization
this.SyncBufferSize = new Size2(0, 0);
this.SyncBuffer = null;
this.SyncBufferLock = new object();
this.SyncBufferChanged = false;
}
