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term: simplify horizontal cursor movement

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Since horizontal cursor movement is clamped to the current line, we
can calculate the new linear cursor without any expensive
multiplications and/or divisions.
This commit is contained in:
Daniel Eklöf 2019-07-02 21:43:49 +02:00
parent e17d297dca
commit dd4647e9ff
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GPG key ID: 5BBD4992C116573F
1 changed files with 6 additions and 2 deletions
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8
terminal.c
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@ -175,14 +175,18 @@ void
term_cursor_left(struct terminal *term, int count) term_cursor_left(struct terminal *term, int count)
{ {
int move_amount = min(term->cursor.col, count); int move_amount = min(term->cursor.col, count);
term_cursor_to(term, term->cursor.row, term->cursor.col - move_amount); term->cursor.linear -= move_amount;
term->cursor.col -= move_amount;
term->print_needs_wrap = false;
} }
void void
term_cursor_right(struct terminal *term, int count) term_cursor_right(struct terminal *term, int count)
{ {
int move_amount = min(term->cols - term->cursor.col - 1, count); int move_amount = min(term->cols - term->cursor.col - 1, count);
term_cursor_to(term, term->cursor.row, term->cursor.col + move_amount); term->cursor.linear += move_amount;
term->cursor.col += move_amount;
term->print_needs_wrap = false;
} }
void void