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BufferView optimization: avoid calling calculate_rows_in_cursor_line() twice per update()

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This commit is contained in:
Josh Holtrop 2017-09-03 18:27:19 -04:00
parent 359f5bed9f
commit f3604e1850
1 changed files with 6 additions and 4 deletions
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10
src/core/BufferView.cc
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@ -36,6 +36,12 @@ BufferView::Iterator BufferView::vert_iter()
void BufferView::update()
{
/* Calculate number of rows in the cursor line and update cursor row offset
* and cursor column values. */
auto start_of_line = std::make_shared<Buffer::Iterator>(*m_iterator);
start_of_line->go_start_of_line();
int rows_in_cursor_line = calculate_rows_in_cursor_line(start_of_line);
/* Update the cursor screen row in case the cursor position changed. */
m_cursor_screen_row = determine_new_cursor_screen_row();
@ -43,9 +49,6 @@ void BufferView::update()
* available buffer contents above and below the current line, and scroll
* offset. */
std::list<std::pair<int, std::shared_ptr<Buffer::Iterator>>> backward_lines;
auto start_of_line = std::make_shared<Buffer::Iterator>(*m_iterator);
start_of_line->go_start_of_line();
int rows_in_cursor_line = calculate_rows_in_cursor_line(start_of_line);
int so = effective_scroll_offset();
int rows_above = screen_rows_above_line(start_of_line, backward_lines) + m_cursor_row_offset;
int rows_below = screen_rows_below_line(start_of_line) + std::max(0, rows_in_cursor_line - m_cursor_row_offset - 1);
@ -115,7 +118,6 @@ int BufferView::determine_new_cursor_screen_row()
{
if (screen_line.line->line() == m_iterator->line())
{
calculate_rows_in_cursor_line(screen_line.line);
return screen_line.row_offset + m_cursor_row_offset;
}
}