public BitmapSource MakeFrame(int width, int height, BitmapSource rawFrame, FrameMetadata metadata, BitmapSource baseFrame)
{
DrawingVisual visual = new DrawingVisual();
using (var context = visual.RenderOpen())
{
if (baseFrame != null)
{
var fullRect = new Rect(0, 0, width, height);
context.DrawImage(baseFrame, fullRect);
}
var rect = new Rect(metadata.Left, metadata.Top, metadata.Width, metadata.Height);
context.DrawImage(rawFrame, rect);
}
var bitmap = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Default);
bitmap.Render(visual);
var result = new WriteableBitmap(bitmap);
if (result.CanFreeze && !result.IsFrozen)
{
result.Freeze();
}
return(result);
}
/// <summary>
/// 获得帧的元数据
/// </summary>
/// <param name="frame"></param>
/// <returns></returns>
public FrameMetadata GetFrameMetadata(BitmapFrame frame)
{
var metadata = (BitmapMetadata)frame.Metadata;
var delay = TimeSpan.FromMilliseconds(100);
var metadataDelay = metadata.GetQueryOrDefault("/grctlext/Delay", 10);
if (metadataDelay != 0)
{
delay = TimeSpan.FromMilliseconds(metadataDelay * 10);
}
var frameMetadata = new FrameMetadata
{
Left = metadata.GetQueryOrDefault("/imgdesc/Left", 0),
Top = metadata.GetQueryOrDefault("/imgdesc/Top", 0),
Width = metadata.GetQueryOrDefault("/imgdesc/Width", frame.PixelWidth),
Height = metadata.GetQueryOrDefault("/imgdesc/Height", frame.PixelHeight),
Delay = delay
};
return(frameMetadata);
}