/**
Create a drawing target from an already existing RenderTarget.
Note that the RenderTarget must use the the same Factory the
drawing backend does.
**/
public IDrawingTarget CreateDrawingTarget(RenderTarget renderTarget)
{
var width = renderTarget.Size.Width;
var height = renderTarget.Size.Height;
var state = new DrawingState();
var transform = new DrawingTransform();
var drawingTarget = new DrawingTarget(state, transform, renderTarget, (int)Math.Floor(width), (int)Math.Floor(height));
var target = new DrawingTargetSplitter(
this,
state,
transform,
drawingTarget,
drawingTarget,
drawingTarget,
drawingTarget,
drawingTarget,
() =>
{
drawingTarget.Dispose();
});
var pixelAligner = PixelAligningDrawingTarget.Create(target, target.Dispose, state, transform);
return pixelAligner;
}
public IDrawingTarget BeginDraw(Color? clearColor)
{
#if NETFX_CORE
var surface = _texture.QueryInterface<Surface>();
#else
var surface = _texture.AsSurface();
#endif
var rtProperties = new RenderTargetProperties
{
DpiX = 96,
DpiY = 96,
Type = RenderTargetType.Default,
PixelFormat = new PixelFormat(Format.Unknown, AlphaMode.Premultiplied)
};
var renderTarget = new RenderTarget(_factory, surface, rtProperties);
renderTarget.BeginDraw();
// required to clear the render target
// not required on all machines, seems to be a driver decision.
renderTarget.Clear(clearColor != null ? clearColor.Value.import() : (Color4?)null);
var state = new DrawingState();
var transform = new DrawingTransform();
var drawingTarget = new DrawingTarget(state, transform, renderTarget, _width, _height);
var target = new DrawingTargetSplitter(
_backend,
state,
transform,
drawingTarget,
drawingTarget,
drawingTarget,
drawingTarget,
drawingTarget,
() =>
{
drawingTarget.Dispose();
renderTarget.EndDraw();
renderTarget.Dispose();
surface.Dispose();
});
var pixelAligner = PixelAligningDrawingTarget.Create(target, target.Dispose, state, transform);
return pixelAligner;
}