Apply a row-major homogeneous 3×3 matrix to an XY column vector.
Mapping from the point's coordinate space to the destination space.
Source point; matching matrices use original pixel-edge coordinates.
Perspective-divided destination point. This low-level helper does not validate the matrix/domain: a projective pole may yield nonfinite coordinates. Use validated candidates and check host projection domains before drawing.
Apply a row-major homogeneous 3×3 matrix to an XY column vector.