/// <summary>
/// Standard method to convert command line parameter string into an enaum <seealso cref="ScaleTO"/> datatype.
/// </summary>
/// <param name="args"></param>
/// <param name="CurrIndex"></param>
/// <param name="ParamName"></param>
/// <param name="scaleValue"></param>
/// <param name="strError"></param>
/// <returns></returns>
public static int GetScaleValue(string[] args,
int CurrIndex,
string ParamName,
out ScaleTO scaleValue,
out string strError)
{
strError = string.Empty;
scaleValue = ScaleTO.OriginalSize;
if (args.Length <= (CurrIndex + 1))
{
strError = string.Format(ParamValueMissingMsg, ParamName);
return(-1);
}
string stringValue = args[CurrIndex + 1];
if (stringValue.Trim().Length == 0)
{
strError = string.Format(ParamValueInvalidStringMsg, ParamName);
return(-1);
}
if (stringValue.ToUpper() == OptScaleModeOriginal.ToUpper())
{
scaleValue = ScaleTO.OriginalSize;
return(0);
}
if (stringValue.ToUpper() == OptScaleModeTarget.ToUpper())
{
scaleValue = ScaleTO.TargetSize;
return(0);
}
strError = string.Format(ParamValueInvalidSizeMsg, ParamName, stringValue, OptScaleModeOriginal, OptScaleModeTarget);
return(-1);
}
private BitmapSource RenderToBitmap(FrameworkElement target,
double width,
double height,
double dpiX,
double dpiY,
ScaleTO thisScale)
{
Rect bounds;
switch (thisScale)
{
case ScaleTO.OriginalSize:
bounds = VisualTreeHelper.GetDescendantBounds(target);
break;
case ScaleTO.TargetSize:
bounds = new Rect(0, 0, width, height);
break;
default:
throw new ArgumentException(string.Format("The scaling mode: {0} is not supported.", thisScale.ToString()));
}
RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)target.ActualWidth,
(int)target.ActualHeight, dpiX, dpiY, PixelFormats.Pbgra32);
DrawingVisual visual = new DrawingVisual();
using (DrawingContext context = visual.RenderOpen())
{
VisualBrush brush = new VisualBrush(target);
context.DrawRectangle(brush, null, new Rect(new Point(), bounds.Size));
}
renderBitmap.Render(visual);
return(renderBitmap);
}
public void Convert(Stream xamlInput,
double width,
double height,
double dpiX,
double dpiY,
ScaleTO thisScale,
Stream pngOutput)
{
try
{
// Round width and height to simplify
width = Math.Round(width);
height = Math.Round(height);
Thread pngCreationThread = new Thread((ThreadStart) delegate()
{
FrameworkElement element = null;
try
{
element = XamlReader.Load(xamlInput) as FrameworkElement;
}
catch (XamlParseException)
{
}
if (element != null)
{
Size renderingSize = new Size(width, height);
element.Measure(renderingSize);
Rect renderingRectangle = new Rect(renderingSize);
element.Arrange(renderingRectangle);
BitmapSource xamlBitmap = RenderToBitmap(element, width, height, dpiX, dpiY, thisScale);
try
{
PngBitmapEncoder enc = new PngBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(xamlBitmap));
enc.Save(pngOutput);
}
catch (ObjectDisposedException)
{
// IF the operation lasted too long, the object might be disposed already
}
}
});
pngCreationThread.IsBackground = true;
pngCreationThread.SetApartmentState(ApartmentState.STA);
pngCreationThread.Start();
pngCreationThread.Join();
}
catch (Exception Exp)
{
throw Exp;
}
try
{
if (pngOutput.Length == 0)
{
throw new TimeoutException();
}
}
catch (ObjectDisposedException)
{
// If the object was disposed, it means that the Stream is ready.
}
}
