Gets the text rendering matrix: from the glyph's text space, one unit per em with the font size, horizontal scaling and rise applied, to page space. Its x axis is the baseline's direction, its y axis points up the glyph; for vertical writing it places the glyph at its horizontal origin, as Origin does.
public Matrix TextRenderingMatrix { get; }
ISO 32000-2 §9.4.4: T_rm = [T_fs·T_h 0 0 T_fs 0 T_rise] × T_m × CTM; §9.7.4.3 for vertical writing.