Context.FontMatrix cause an exception to be thrown.

[zwcloud]

This is an issue from Brad and is to be reproduced.

Context context;
Matrix matrix = context.FontMatrix;

This will cause an exception to be thrown. It looks like it is coming from the Native code. I wasn’t sure how you were sourcing the cairod.dll so I stopped digging there.

[MatthiasSchilder]

I did see the same issue when using the FontMatrix-getter. Changing the Matrix-parameter of NativeMethods.cairo_get_font_matrix to being a non-out-param did the trick for us:

internal static extern void cairo_get_font_matrix (IntPtr cr, Matrix matrix);
public Matrix FontMatrix {
	get {
		CheckDisposed ();
		Matrix m = new Matrix();
		NativeMethods.cairo_get_font_matrix (handle, m);
		return m;
	}
	set {
		CheckDisposed ();
		NativeMethods.cairo_set_font_matrix (handle, value);
	}
}

This way, it is also done in the Matrix property of Context (which worked out of the box), so I assume this fixes it.