public IObservable <IplImage> Generate <TSource>(IObservable <TSource> source)
{
return(Observable.Defer(() =>
{
var flipBuffer = default(IplImage);
return source.CombineEither(
ShaderManager.WindowSource,
(input, window) =>
{
IplImage temp;
PixelType pixelType;
PixelFormat pixelFormat;
var rect = RegionOfInterest.GetValueOrDefault(new Rect(0, 0, window.Width, window.Height));
var result = new IplImage(new Size(rect.Width, rect.Height), IplDepth.U8, 3);
rect.Y = window.Height - (rect.Y + rect.Height);
TextureHelper.PackPixelStore(result, out pixelFormat, out pixelType);
GL.ReadPixels(rect.X, rect.Y, rect.Width, rect.Height, pixelFormat, pixelType, result.ImageData);
if (flipBuffer == null || flipBuffer.Size != result.Size)
{
flipBuffer = new IplImage(result.Size, result.Depth, result.Channels);
}
CV.Flip(result, flipBuffer, FlipMode.Vertical);
temp = result;
result = flipBuffer;
flipBuffer = temp;
return result;
});
}));
}
public override IObservable <IplImage> Process(IObservable <Texture> source)
{
return(Observable.Defer(() =>
{
var flipBuffer = default(IplImage);
return source.Select(texture =>
{
int width, height;
PixelType pixelType;
PixelFormat pixelFormat;
GL.BindTexture(TextureTarget.Texture2D, texture.Id);
GL.GetTexLevelParameter(TextureTarget.Texture2D, 0, GetTextureParameter.TextureWidth, out width);
GL.GetTexLevelParameter(TextureTarget.Texture2D, 0, GetTextureParameter.TextureHeight, out height);
var result = new IplImage(new Size(width, height), Depth, Channels);
TextureHelper.PackPixelStore(result, out pixelFormat, out pixelType);
GL.GetTexImage(TextureTarget.Texture2D, 0, pixelFormat, pixelType, result.ImageData);
var flipMode = FlipMode;
if (flipMode.HasValue)
{
IplImage temp;
if (flipBuffer == null)
{
flipBuffer = new IplImage(result.Size, result.Depth, result.Channels);
}
CV.Flip(result, flipBuffer, flipMode.Value);
temp = result;
result = flipBuffer;
flipBuffer = temp;
}
return result;
});
}));
}
