/// <summary>
/// Generate the stereogram on a background thread. First wait for the specified interval and see if another request pre-empts us.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void generate_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
// Keep generating as long as there's a request in the pipe
while (requestOptions != null)
{
Options options = requestOptions;
requestOptions = null;
if (options.time.Ticks > DateTime.Now.Ticks)
{
TimeSpan delta = new TimeSpan(options.time.Ticks - DateTime.Now.Ticks);
if (delta.TotalMilliseconds > 50)
{
Thread.Sleep(delta);
}
}
if (worker.CancellationPending)
{
e.Cancel = true;
return;
}
if (options != null && requestOptions == null)
{
ThreadPriority old = Thread.CurrentThread.Priority;
try
{
Thread.CurrentThread.Priority = ThreadPriority.BelowNormal;
generator = StereogramGenerator.Get(options);
Stereogram stereogram = generator.Generate();
stereogram.Name = String.Format("{0} + {1}", options.depthmap.Name, options.texture.Name);
e.Result = stereogram;
}
finally
{
Thread.CurrentThread.Priority = old;
}
}
}
}
// When the thread completes, we hopefully have a completed stereogram to return to the callback
private void generate_Completed(object sender, RunWorkerCompletedEventArgs e)
{
// First, handle the case where an exception was thrown.
if (e.Error != null)
{
// Let the callback handle a NULL result
if (callback != null)
{
callback(null);
}
}
else if (e.Cancelled)
{
}
else if (e.Result is Stereogram)
{
Stereogram stereogram = (Stereogram)e.Result;
if (callback != null)
{
callback(stereogram);
}
}
}
/// <summary>
/// Generate the stereogram. Does all the common functionality, then calls the delegate
/// set by the subclass to do the actual work.
/// </summary>
public Stereogram Generate()
{
// Let's do some profiling
System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
timer.Start();
// Convert texture to RGB24 and scale it to fit the separation (preserving ratio but doubling width for HQ mode)
bmTexture = texture.GetToScaleAndFormat(textureWidth, textureHeight, PixelFormats.Pbgra32);
// Resize the depthmap to our target resolution
bmDepthMap = depthmap.GetToScale(depthWidth, resolutionY);
// Create a great big 2D array to hold the bytes - wasteful but convenient
// ... and necessary for parallelisation
pixels = new UInt32[lineWidth * rows];
// Copy the texture data into a buffer
texturePixels = new UInt32[textureWidth * textureHeight];
bmTexture.CopyPixels(new Int32Rect(0, 0, textureWidth, textureHeight), texturePixels, textureWidth * bytesPerPixel, 0);
// Copy the depthmap data into a buffer
depthBytes = new byte[depthWidth * rows];
bmDepthMap.CopyPixels(new Int32Rect(0, 0, depthWidth, rows), depthBytes, depthWidth, 0);
// Can mock up a progress indicator
GeneratedLines = 0;
// Prime candidate for Parallel.For... yes, about doubles the speed of generation on my Quad-Core
if (System.Diagnostics.Debugger.IsAttached) // Don't run parallel when debugging
{
for (int y = 0; y < rows; y++)
{
DoLine(y);
if (y > GeneratedLines)
{
GeneratedLines = y;
}
}
}
else
{
Parallel.For(0, rows, y =>
{
if (false == abort)
{
DoLine(y);
}
if (y > GeneratedLines)
{
GeneratedLines = y;
}
});
}
if (abort)
{
return(null);
}
// Virtual finaliser... not needed for any current algorithms
Finalise();
// Create a writeable bitmap to dump the stereogram into
wbStereogram = new WriteableBitmap(lineWidth, resolutionY, 96.0, 96.0, bmTexture.Format, bmTexture.Palette);
wbStereogram.WritePixels(new Int32Rect(0, 0, lineWidth, rows), pixels, lineWidth * bytesPerPixel, 0);
BitmapSource bmStereogram = wbStereogram;
// High quality images need to be scaled back down...
if (oversample > 1)
{
double over = (double)oversample;
double centre = lineWidth / 2;
while (over > 1)
{
// Scale by steps... could do it in one pass, but quality would depend on what the hardware does?
double div = Math.Min(over, 2.0);
// double div = over;
ScaleTransform scale = new ScaleTransform(1.0 / div, 1.0, centre, 0);
bmStereogram = new TransformedBitmap(bmStereogram, scale);
over /= div;
centre /= div;
}
}
if (bAddConvergenceDots)
{
// Because I made these fields read-only, I can't now restore them... 'spose I could add the dots at hi-res but I'd still need to account for the stretching
double sep = separation / oversample;
double mid = midpoint / oversample;
RenderTargetBitmap rtStereogram = new RenderTargetBitmap(bmStereogram.PixelWidth, bmStereogram.PixelHeight, 96.0, 96.0, PixelFormats.Pbgra32);
DrawingVisual dots = new DrawingVisual();
DrawingContext dc = dots.RenderOpen();
dc.DrawImage(bmStereogram, new Rect(0.0, 0.0, rtStereogram.Width, rtStereogram.Height));
dc.DrawEllipse(new SolidColorBrush(Colors.Black),
new Pen(new SolidColorBrush(Color.FromArgb(128, 0, 0, 0)), 1.0),
new Point(mid - sep / 2, rtStereogram.Height / 16), sep / 16, sep / 16);
dc.DrawEllipse(new SolidColorBrush(Colors.Black),
new Pen(new SolidColorBrush(Color.FromArgb(128, 0, 0, 0)), 1.0),
new Point(mid + sep / 2, rtStereogram.Height / 16), sep / 16, sep / 16);
dc.Close();
rtStereogram.Render(dots);
bmStereogram = rtStereogram;
}
// Freeze the bitmap so it can be passed to other threads
bmStereogram.Freeze();
timer.Stop();
Stereogram stereogram = new Stereogram(bmStereogram);
stereogram.options = this.options;
stereogram.Name = String.Format("{0}+{1}+{2}", depthmap.Name, texture.Name, options.algorithm.ToString());
stereogram.Milliseconds = timer.ElapsedMilliseconds;
return(stereogram);
}