private void ExportImages(IBackgroundTaskContext context, ref List <IPresentationImage> imagesToDispose)
{
ExportImageParams exportParams = new ExportImageParams();
exportParams.Scale = Scale;
exportParams.ExportOption = _exportOption;
exportParams.DisplayRectangle = _clipboardItem.DisplayRectangle;
exportParams.SizeMode = SizeMode;
exportParams.OutputSize = new Size(Width, Height);
exportParams.BackgroundColor = BackgroundColor;
using (Avi.VideoStreamWriter writer = new Avi.VideoStreamWriter(_selectedCodec))
{
if (!UseDefaultQuality)
{
writer.Quality = _quality;
}
for (int i = 0; i < NumberOfImages; ++i)
{
if (context != null && context.CancelRequested)
{
break;
}
if (context != null)
{
int number = i + 1;
string message = String.Format(SR.MessageFormatExportingFrame, number, NumberOfImages);
ReportProgress(context, message, number);
}
IPresentationImage image = ImageExporter.ClonePresentationImage(DisplaySet.PresentationImages[i]);
imagesToDispose.Add(image);
using (Bitmap bitmap = ImageExporter.DrawToBitmap(image, exportParams))
{
if (!writer.IsOpen)
{
//many codecs (like DivX) expect width and/or height to be divisible by 4.
int width = NormalizeDimension(bitmap.Width);
int height = NormalizeDimension(bitmap.Height);
writer.Width = width;
writer.Height = height;
writer.FrameRate = this.FrameRate;
writer.Open(this.FilePath);
}
writer.AddBitmap(bitmap);
}
}
}
}
private IPresentationImage GetImageForExport(IPresentationImage image)
{
if (IsAsynchronous)
{
// A graphic should belong to (and be disposed on) a single thread
// and should not be rendered on multiple threads, so we clone it.
// Technically, we should be doing the clone on the main thread
// and then passing it to the worker, but that would require blocking
// the main thread while we cloned all the images.
_imagesToDispose.Add(image = ImageExporter.ClonePresentationImage(image));
}
return(image);
}