internal Path RenderToCairoPath(Context context, DirectWriteCairoTextRenderer render, TextLayout textLayout)
{
//Debug.WriteLine("Before `Draw`: Current point at <{0},{1}>", (float)context.CurrentPoint.X, (float)context.CurrentPoint.Y);
Draw(context.Handle, render, (float)context.CurrentPoint.X, (float)context.CurrentPoint.Y);
var result = context.CopyPath();
context.NewPath();
return result;
}
/// <summary>
/// Initiate drawing of the text.
/// (In fact it just build a cairo path of the text. It DO NOT draw to cairo surface.)
/// </summary>
/// <param name="clientDrawingContext">An application defined value
/// included in rendering callbacks.</param>
/// <param name="renderer">The set of application-defined callbacks that do
/// the actual rendering.</param>
/// <param name="originX">X-coordinate of the layout's left side.</param>
/// <param name="originY">Y-coordinate of the layout's top side.</param>
/// <remarks>
/// Native signature of the COM method
/// <code>
/// STDMETHOD(Draw)(
/// _In_opt_ void* clientDrawingContext,
/// _In_ IDWriteTextRenderer* renderer,
/// FLOAT originX,
/// FLOAT originY
/// ) PURE;
/// </code>
/// </remarks>
private void Draw(
IntPtr clientDrawingContext, DirectWriteCairoTextRenderer renderer,
float originX, float originY)
{
var dwriterender = (IDWriteTextRenderer) renderer.comObject;
Marshal.ThrowExceptionForHR(draw(
comObject,
clientDrawingContext, dwriterender, originX, originY));
}