getCodepoint

Returns the base (first) codepoint for the cell at col.

• For plain cells this is the full Unicode scalar value.

• For cluster cells this is the leading codepoint of the grapheme sequence. Simple renderers that map one cell to one glyph can use this value directly.

• Returns 0 for blank cells.

• Returns -1 for the right half of a 2-cell wide character; renderers should skip such cells.

Parameters