Iterates the full 0..2π sweep produced by a color-stop list,
invoking emit_patch once per (start, end) angular segment.
Handles #HB_PAINT_EXTEND_PAD, #HB_PAINT_EXTEND_REPEAT, and
#HB_PAINT_EXTEND_REFLECT. Stops must be pre-sorted by
offset; use hb_paint_normalize_color_line() first if they
aren't.
Iterates the full 0..2π sweep produced by a color-stop list, invoking
emit_patchonce per (start, end) angular segment. Handles #HB_PAINT_EXTEND_PAD, #HB_PAINT_EXTEND_REPEAT, and #HB_PAINT_EXTEND_REFLECT. Stops must be pre-sorted by offset; usehb_paint_normalize_color_line()first if they aren't.