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patch 8.0.1797: terminal window is redrawn too often

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Problem:    Terminal window is redrawn too often and scrolling is repeated.
Solution:   Don't scroll immediately but only when redrawing.  Avoid redrawing
            the whole terminal window on every change.
This commit is contained in:
Bram Moolenaar
2018-05-06 16:40:16 +02:00
parent 231a2db1b3
commit 6eddadff13
4 changed files with 70 additions and 38 deletions
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87
src/terminal.c
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@@ -42,9 +42,6 @@
* redirection. Probably in call to channel_set_pipes().
* - Win32: Redirecting output does not work, Test_terminal_redir_file()
* is disabled.
* - handle_moverect() scrolls one line at a time. Postpone scrolling, count
* the number of lines, until a redraw happens. Then if scrolling many lines
* a redraw is faster.
* - Copy text in the vterm to the Vim buffer once in a while, so that
* completion works.
* - When the job only outputs lines, we could handle resizing the terminal
@@ -137,6 +134,8 @@ struct terminal_S {
int tl_dirty_row_start; /* MAX_ROW if nothing dirty */
int tl_dirty_row_end; /* row below last one to update */
int tl_postponed_scroll; /* to be scrolled up */
garray_T tl_scrollback;
int tl_scrollback_scrolled;
cellattr_T tl_default_color;
@@ -2373,44 +2372,55 @@ handle_damage(VTermRect rect, void *user)
term->tl_dirty_row_start = MIN(term->tl_dirty_row_start, rect.start_row);
term->tl_dirty_row_end = MAX(term->tl_dirty_row_end, rect.end_row);
redraw_buf_later(term->tl_buffer, NOT_VALID);
redraw_buf_later(term->tl_buffer, SOME_VALID);
return 1;
}
static void
term_scroll_up(term_T *term, int start_row, int count)
{
win_T *wp;
VTermColor fg, bg;
VTermScreenCellAttrs attr;
int clear_attr;
/* Set the color to clear lines with. */
vterm_state_get_default_colors(vterm_obtain_state(term->tl_vterm),
&fg, &bg);
vim_memset(&attr, 0, sizeof(attr));
clear_attr = cell2attr(attr, fg, bg);
FOR_ALL_WINDOWS(wp)
{
if (wp->w_buffer == term->tl_buffer)
win_del_lines(wp, start_row, count, FALSE, FALSE, clear_attr);
}
}
static int
handle_moverect(VTermRect dest, VTermRect src, void *user)
{
term_T *term = (term_T *)user;
int count = src.start_row - dest.start_row;
/* Scrolling up is done much more efficiently by deleting lines instead of
* redrawing the text. */
* redrawing the text. But avoid doing this multiple times, postpone until
* the redraw happens. */
if (dest.start_col == src.start_col
&& dest.end_col == src.end_col
&& dest.start_row < src.start_row)
{
win_T *wp;
VTermColor fg, bg;
VTermScreenCellAttrs attr;
int clear_attr;
/* Set the color to clear lines with. */
vterm_state_get_default_colors(vterm_obtain_state(term->tl_vterm),
&fg, &bg);
vim_memset(&attr, 0, sizeof(attr));
clear_attr = cell2attr(attr, fg, bg);
FOR_ALL_WINDOWS(wp)
{
if (wp->w_buffer == term->tl_buffer)
win_del_lines(wp, dest.start_row,
src.start_row - dest.start_row, FALSE, FALSE,
clear_attr);
}
if (dest.start_row == 0)
term->tl_postponed_scroll += count;
else
term_scroll_up(term, dest.start_row, count);
}
term->tl_dirty_row_start = MIN(term->tl_dirty_row_start, dest.start_row);
term->tl_dirty_row_end = MIN(term->tl_dirty_row_end, dest.end_row);
/* Note sure if the scrolling will work correctly, let's do a complete
* redraw later. */
redraw_buf_later(term->tl_buffer, NOT_VALID);
return 1;
}
@@ -2857,11 +2867,22 @@ update_system_term(term_T *term)
#endif
/*
* Called to update a window that contains an active terminal.
* Returns FAIL when there is no terminal running in this window or in
* Return TRUE if window "wp" is to be redrawn with term_update_window().
* Returns FALSE when there is no terminal running in this window or it is in
* Terminal-Normal mode.
*/
int
term_do_update_window(win_T *wp)
{
term_T *term = wp->w_buffer->b_term;
return term != NULL && term->tl_vterm != NULL && !term->tl_normal_mode;
}
/*
* Called to update a window that contains an active terminal.
*/
void
term_update_window(win_T *wp)
{
term_T *term = wp->w_buffer->b_term;
@@ -2874,17 +2895,23 @@ term_update_window(win_T *wp)
int minsize;
win_T *twp;
if (term == NULL || term->tl_vterm == NULL || term->tl_normal_mode)
return FAIL;
vterm = term->tl_vterm;
screen = vterm_obtain_screen(vterm);
state = vterm_obtain_state(vterm);
if (wp->w_redr_type >= SOME_VALID)
/* We use NOT_VALID on a resize or scroll, redraw everything then. With
* SOME_VALID only redraw what was marked dirty. */
if (wp->w_redr_type > SOME_VALID)
{
term->tl_dirty_row_start = 0;
term->tl_dirty_row_end = MAX_ROW;
if (term->tl_postponed_scroll > 0
&& term->tl_postponed_scroll < term->tl_rows / 3)
/* Scrolling is usually faster than redrawing, when there are only
* a few lines to scroll. */
term_scroll_up(term, 0, term->tl_postponed_scroll);
term->tl_postponed_scroll = 0;
}
/*
@@ -2943,8 +2970,6 @@ term_update_window(win_T *wp)
}
term->tl_dirty_row_start = MAX_ROW;
term->tl_dirty_row_end = 0;
return OK;
}
/*